diff --git a/.github/workflows/publish-fastmcp.yml b/.github/workflows/publish-fastmcp.yml index 4361e4bb2..3e22fe915 100644 --- a/.github/workflows/publish-fastmcp.yml +++ b/.github/workflows/publish-fastmcp.yml @@ -133,5 +133,19 @@ jobs: fetch-depth: 0 ref: ${{ github.event.workflow_run.head_sha }} + - name: Check release line + id: release_line + env: + DEFAULT_BRANCH: ${{ github.event.repository.default_branch }} + run: | + git fetch origin "${DEFAULT_BRANCH}:refs/remotes/origin/${DEFAULT_BRANCH}" + if git merge-base --is-ancestor HEAD "refs/remotes/origin/${DEFAULT_BRANCH}"; then + echo "update_published_docs=true" >> "$GITHUB_OUTPUT" + else + echo "update_published_docs=false" >> "$GITHUB_OUTPUT" + echo "Release commit is not on ${DEFAULT_BRANCH}; skipping published-docs update." + fi + - name: Point published-docs at published release + if: steps.release_line.outputs.update_published_docs == 'true' run: git push --force origin "HEAD:published-docs" diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml index 4bae75006..aa5777786 100644 --- a/.github/workflows/run-tests.yml +++ b/.github/workflows/run-tests.yml @@ -222,7 +222,7 @@ jobs: run: | uv venv /tmp/fastmcp-full-smoke FULL_WHEEL=$(ls /tmp/fastmcp-dist/fastmcp-*.whl) - uv pip install --python /tmp/fastmcp-full-smoke/bin/python --find-links /tmp/fastmcp-dist "$FULL_WHEEL" + uv pip install --python /tmp/fastmcp-full-smoke/bin/python --prerelease=allow --find-links /tmp/fastmcp-dist "$FULL_WHEEL" /tmp/fastmcp-full-smoke/bin/python - <<'PY' from importlib.metadata import entry_points from importlib.metadata import requires @@ -250,7 +250,7 @@ jobs: run: | uv venv /tmp/fastmcp-remote-smoke REMOTE_WHEEL=$(ls /tmp/fastmcp-dist/fastmcp_remote-*.whl) - uv pip install --python /tmp/fastmcp-remote-smoke/bin/python --find-links /tmp/fastmcp-dist "$REMOTE_WHEEL" + uv pip install --python /tmp/fastmcp-remote-smoke/bin/python --prerelease=allow --find-links /tmp/fastmcp-dist "$REMOTE_WHEEL" /tmp/fastmcp-remote-smoke/bin/python - <<'PY' from importlib.metadata import entry_points from importlib.metadata import requires diff --git a/CLAUDE.md b/CLAUDE.md index a71054b93..e900cc9c7 100644 --- a/CLAUDE.md +++ b/CLAUDE.md @@ -84,12 +84,12 @@ Only cut releases when the maintainer explicitly asks. Tags follow `v` Write the maintainer-approved handwritten notes to a temporary file, then create the release. `--generate-notes` appends the auto-generated changelog after the handwritten content. ```bash -gh release create v3.2.0 --target main --title "v3.2.0: Theme Here" --generate-notes --notes-start-tag v3.1.1 --notes-file /tmp/release-notes.md +gh release create v4.0.0 --target main --title "v4.0.0: Theme Here" --generate-notes --notes-start-tag v3.4.4 --notes-file /tmp/release-notes.md ``` **Always pass `--notes-start-tag `.** Without it, `--generate-notes` picks the most recent prior tag as the changelog start point — and if a prerelease exists (e.g. `v3.4.0b1`), it starts from *that*, silently truncating the PR list to only the commits since the beta. Pin it to the last stable release (e.g. `v3.3.1` when cutting `v3.4.0`). Verify after: the compare link at the bottom of the generated notes should read `v...v`. -Most releases target `main`, but maintenance or backport releases may target a different branch (e.g., `release/2.x`). Confirm the target with the maintainer if there's any ambiguity. +Use the branch that owns the release line as the target: current-major releases target `main`, 3.x maintenance releases target `release/3.x`, and 2.x maintenance releases target `release/2.x`. Confirm the target with the maintainer if there's any ambiguity. For example, cut a 3.4.4 maintenance release with `--target release/3.x`, not `main`. The handwritten notes are prepended above the auto-generated changelog and are the part that matters. Do not include a title in the notes body — the release title (`v{version}: {pun}`) already serves as the heading. Work with the maintainer to draft the notes — propose a draft, get feedback, iterate. Do not publish without the maintainer's sign-off. @@ -105,16 +105,18 @@ gh api -X POST repos/PrefectHQ/fastmcp/releases/generate-notes \ --jq '.body' ``` +Set `target_commitish` to the same branch that will receive the release tag. For maintenance releases, use the maintenance branch (for example, `release/3.x`) so the preview matches the release notes GitHub will generate. + **Point releases** (3.0, 3.1, 3.2) get narrative prose: open with the theme of the release, then walk through headline features conceptually — what they enable, why they matter, how they fit together. Write it the way a blog post reads, not a changelog. Multiple paragraphs, code examples where they clarify. **Patch releases** (3.1.1, 3.0.2) get 1-2 sentences explaining what broke and what the fix does. Keep it minimal — the auto-generated changelog has the details. -**Merge the docs changelog PR *before* cutting the release, not after.** The post-publish `update-published-docs` job force-pushes the `published-docs` branch (which gofastmcp.com serves) to the *released commit* — so the changelog entry only reaches the live site if it's already in the commit being tagged. Land the docs PR on `main` first, then cut the release from `main`. If you tag first and merge docs after, this release's changelog won't appear on the live site until the *next* release force-pushes `published-docs` forward. Two hand-maintained files mirror the GitHub release and must get a new entry for every version, newest at the top (these are `.mdx` and are not covered by the prek Prettier hook, which only runs on `yaml`/`json5` — match the existing entries' style by hand): +**Merge the docs changelog PR *before* cutting the release, not after.** The post-publish `update-published-docs` job force-pushes the `published-docs` branch (which gofastmcp.com serves) to the released commit for stable releases on the default branch, so the changelog entry only reaches the live site if it's already in the commit being tagged. Land the docs PR on the release target branch first, then cut the release from that branch. If you tag first and merge docs after, this release's changelog won't appear on the live site until the next default-branch stable release force-pushes `published-docs` forward. Maintenance releases from `release/3.x` or `release/2.x` publish packages and GitHub notes without repointing `published-docs`; add their changelog entries on the maintenance branch, slotted into the matching major-version section. Two hand-maintained files mirror the GitHub release and must get a new entry for every version, newest at the top (these are `.mdx` and are not covered by the prek Prettier hook, which only runs on `yaml`/`json5` — match the existing entries' style by hand): - `docs/changelog.mdx` is the full mirror. Add an `` block with: a bold linked title (`**[v: ]()**`), a condensed 1-paragraph intro (one sentence for patches), the full categorized PR list reformatted from the `--generate-notes` output (`* by [@user](https://github.com/user) in [#NNNN](<pull-url>)`), a `## New Contributors` list (plain `@user`, linked PR), and a `**Full Changelog**: [vA...vB](<compare-url>)` line. - `docs/updates.mdx` is the skimmable card feed. Add an `<Update label="FastMCP <version>" description="Month DD, YYYY" tags={["Releases"]}>` wrapping a `<Card>` that links to the GitHub release, with a 1-2 sentence summary and (for point releases) a handful of emoji-bulleted highlights. -Because the docs land *before* the tag exists, derive the entry from the maintainer-approved handwritten notes (intro/summary) and the `--generate-notes` API *preview* (the PR-list body — see the generate-notes API call above, which returns the exact changelog without cutting anything). Scripting the link reformatting is reliable for long PR lists. The release-URL, tag, and compare links follow the known pattern (`/releases/tag/v<version>`, `compare/v<last-stable>...v<version>`) and will 404 only during the short window between merging the docs PR and cutting the release minutes later — they resolve before `published-docs` ever deploys, since that happens after the full publish chain. For this reason, create and merge the docs PR *immediately* before cutting the release — treat the two as one tight back-to-back sequence, not independent steps — so the links are valid by the time the release publishes rather than dangling for any longer than necessary. Maintenance/backport releases (e.g. `v2.14.7`) get an entry in the same two files, slotted into the 2.x section. +Because the docs land *before* the tag exists, derive the entry from the maintainer-approved handwritten notes (intro/summary) and the `--generate-notes` API *preview* (the PR-list body — see the generate-notes API call above, which returns the exact changelog without cutting anything). Scripting the link reformatting is reliable for long PR lists. The release-URL, tag, and compare links follow the known pattern (`/releases/tag/v<version>`, `compare/v<last-stable>...v<version>`) and will 404 only during the short window between merging the docs PR and cutting the release minutes later — they resolve before the release workflow completes. For this reason, create and merge the docs PR *immediately* before cutting the release — treat the two as one tight back-to-back sequence, not independent steps — so the links are valid by the time the release publishes rather than dangling for any longer than necessary. ### Commit Messages and Agent Attribution diff --git a/docs/apps/low-level.mdx b/docs/apps/low-level.mdx index ccef52b0a..3dd386a65 100644 --- a/docs/apps/low-level.mdx +++ b/docs/apps/low-level.mdx @@ -212,11 +212,11 @@ import base64 import io import qrcode -from mcp import types from fastmcp import FastMCP from fastmcp.apps import AppConfig, ResourceCSP from fastmcp.tools import ToolResult +from fastmcp.types import ImageContent mcp = FastMCP("QR Code Server") @@ -236,7 +236,7 @@ def generate_qr(text: str = "https://gofastmcp.com") -> ToolResult: b64 = base64.b64encode(buffer.getvalue()).decode() return ToolResult( - content=[types.ImageContent(type="image", data=b64, mimeType="image/png")] + content=[ImageContent(type="image", data=b64, mime_type="image/png")] ) diff --git a/docs/clients/client.mdx b/docs/clients/client.mdx index fc5ddc263..4d985e187 100644 --- a/docs/clients/client.mdx +++ b/docs/clients/client.mdx @@ -135,7 +135,7 @@ def greet(name: str) -> str: async with Client(mcp) as client: # Initialization already happened automatically - print(f"Server: {client.initialize_result.serverInfo.name}") + print(f"Server: {client.initialize_result.server_info.name}") print(f"Instructions: {client.initialize_result.instructions}") print(f"Capabilities: {client.initialize_result.capabilities.tools}") ``` @@ -154,7 +154,7 @@ async with client: # Initialize manually with custom timeout result = await client.initialize(timeout=10.0) - print(f"Server: {result.serverInfo.name}") + print(f"Server: {result.server_info.name}") # Now ready for operations tools = await client.list_tools() diff --git a/docs/clients/elicitation.mdx b/docs/clients/elicitation.mdx index 33adbb6d6..dc0135ae3 100644 --- a/docs/clients/elicitation.mdx +++ b/docs/clients/elicitation.mdx @@ -69,7 +69,7 @@ The handler receives four parameters: </ResponseField> <ResponseField name="params" type="ElicitRequestParams"> - The original MCP elicitation parameters, including the raw JSON schema in `params.requestedSchema` + The original MCP elicitation parameters, including the raw JSON schema in `params.requested_schema` </ResponseField> <ResponseField name="context" type="RequestContext"> diff --git a/docs/clients/notifications.mdx b/docs/clients/notifications.mdx index 5e1b447aa..aa7d47058 100644 --- a/docs/clients/notifications.mdx +++ b/docs/clients/notifications.mdx @@ -22,8 +22,8 @@ from fastmcp import Client async def message_handler(message): """Handle MCP notifications from the server.""" - if hasattr(message, 'root'): - method = message.root.method + if hasattr(message, 'method'): + method = message.method if method == "notifications/tools/list_changed": print("Tools have changed - refresh tool cache") @@ -45,23 +45,23 @@ For fine-grained targeting, subclass `MessageHandler` to use specific hooks: ```python from fastmcp import Client from fastmcp.client.messages import MessageHandler -import mcp.types +import mcp_types class MyMessageHandler(MessageHandler): async def on_tool_list_changed( - self, notification: mcp.types.ToolListChangedNotification + self, notification: mcp_types.ToolListChangedNotification ) -> None: """Handle tool list changes.""" print("Tool list changed - refreshing available tools") async def on_resource_list_changed( - self, notification: mcp.types.ResourceListChangedNotification + self, notification: mcp_types.ResourceListChangedNotification ) -> None: """Handle resource list changes.""" print("Resource list changed") async def on_prompt_list_changed( - self, notification: mcp.types.PromptListChangedNotification + self, notification: mcp_types.PromptListChangedNotification ) -> None: """Handle prompt list changes.""" print("Prompt list changed") @@ -76,7 +76,7 @@ client = Client( ```python from fastmcp.client.messages import MessageHandler -import mcp.types +import mcp_types class MyMessageHandler(MessageHandler): async def on_message(self, message) -> None: @@ -84,37 +84,37 @@ class MyMessageHandler(MessageHandler): pass async def on_notification( - self, notification: mcp.types.ServerNotification + self, notification: mcp_types.ServerNotification ) -> None: """Called for notifications (fire-and-forget).""" pass async def on_tool_list_changed( - self, notification: mcp.types.ToolListChangedNotification + self, notification: mcp_types.ToolListChangedNotification ) -> None: """Called when the server's tool list changes.""" pass async def on_resource_list_changed( - self, notification: mcp.types.ResourceListChangedNotification + self, notification: mcp_types.ResourceListChangedNotification ) -> None: """Called when the server's resource list changes.""" pass async def on_prompt_list_changed( - self, notification: mcp.types.PromptListChangedNotification + self, notification: mcp_types.PromptListChangedNotification ) -> None: """Called when the server's prompt list changes.""" pass async def on_progress( - self, notification: mcp.types.ProgressNotification + self, notification: mcp_types.ProgressNotification ) -> None: """Called for progress updates during long-running operations.""" pass async def on_logging_message( - self, notification: mcp.types.LoggingMessageNotification + self, notification: mcp_types.LoggingMessageNotification ) -> None: """Called for log messages from the server.""" pass @@ -127,14 +127,14 @@ A practical example of maintaining a tool cache that refreshes when tools change ```python from fastmcp import Client from fastmcp.client.messages import MessageHandler -import mcp.types +import mcp_types class ToolCacheHandler(MessageHandler): def __init__(self): self.cached_tools = [] async def on_tool_list_changed( - self, notification: mcp.types.ToolListChangedNotification + self, notification: mcp_types.ToolListChangedNotification ) -> None: """Clear tool cache when tools change.""" print("Tools changed - clearing cache") diff --git a/docs/clients/prompts.mdx b/docs/clients/prompts.mdx index bb50d475f..5d1bd7377 100644 --- a/docs/clients/prompts.mdx +++ b/docs/clients/prompts.mdx @@ -21,7 +21,7 @@ Request a rendered prompt with `get_prompt()`: async with client: # Simple prompt without arguments result = await client.get_prompt("welcome_message") - # result -> mcp.types.GetPromptResult + # result -> fastmcp.types.GetPromptResult # Access the generated messages for message in result.messages: @@ -143,5 +143,5 @@ For complete control, use `get_prompt_mcp()` which returns the full MCP protocol ```python async with client: result = await client.get_prompt_mcp("example_prompt", {"arg": "value"}) - # result -> mcp.types.GetPromptResult + # result -> fastmcp.types.GetPromptResult ``` diff --git a/docs/clients/resources.mdx b/docs/clients/resources.mdx index a3e9300da..197ec6c3e 100644 --- a/docs/clients/resources.mdx +++ b/docs/clients/resources.mdx @@ -53,7 +53,7 @@ async with client: for item in content: if hasattr(item, 'text'): print(f"Text content: {item.text}") - print(f"MIME type: {item.mimeType}") + print(f"MIME type: {item.mime_type}") ``` Binary resources include images, PDFs, and other non-text data: @@ -65,7 +65,7 @@ async with client: for item in content: if hasattr(item, 'blob'): print(f"Binary content: {len(item.blob)} bytes") - print(f"MIME type: {item.mimeType}") + print(f"MIME type: {item.mime_type}") # Save to file with open("downloaded_logo.png", "wb") as f: @@ -106,5 +106,5 @@ For complete control, use `read_resource_mcp()` which returns the full MCP proto ```python async with client: result = await client.read_resource_mcp("resource://example") - # result -> mcp.types.ReadResourceResult + # result -> fastmcp.types.ReadResourceResult ``` diff --git a/docs/clients/sampling.mdx b/docs/clients/sampling.mdx index 6b845c3bb..b0655989b 100644 --- a/docs/clients/sampling.mdx +++ b/docs/clients/sampling.mdx @@ -42,7 +42,7 @@ async def sampling_handler( conversation.append(f"{message.role}: {content}") # Use the system prompt if provided - system_prompt = params.systemPrompt or "You are a helpful assistant." + system_prompt = params.system_prompt or "You are a helpful assistant." # Integrate with your LLM service here return "Generated response based on the messages" @@ -172,7 +172,7 @@ Install the Google Gemini handler with `pip install fastmcp[gemini]`. When you provide a `sampling_handler`, FastMCP automatically advertises full sampling capabilities to the server, including tool support. To disable tool support for simpler handlers: ```python -from mcp.types import SamplingCapability +from fastmcp.types import SamplingCapability client = Client( "my_mcp_server.py", diff --git a/docs/clients/tools.mdx b/docs/clients/tools.mdx index 1541f593e..9422c30a8 100644 --- a/docs/clients/tools.mdx +++ b/docs/clients/tools.mdx @@ -80,7 +80,7 @@ async with client: Fully hydrated Python objects with complex type support (datetimes, UUIDs, custom classes). FastMCP exclusive. </ResponseField> -<ResponseField name=".content" type="list[mcp.types.ContentBlock]"> +<ResponseField name=".content" type="list[fastmcp.types.ContentBlock]"> Standard MCP content blocks (`TextContent`, `ImageContent`, `AudioContent`, etc.). </ResponseField> @@ -173,9 +173,9 @@ For complete control, use `call_tool_mcp()` which returns the raw MCP protocol o ```python async with client: result = await client.call_tool_mcp("my_tool", {"param": "value"}) - # result -> mcp.types.CallToolResult + # result -> fastmcp.types.CallToolResult - if result.isError: + if result.is_error: print(f"Tool failed: {result.content}") else: print(f"Tool succeeded: {result.content}") diff --git a/docs/development/releases.mdx b/docs/development/releases.mdx index 346462736..331fd810c 100644 --- a/docs/development/releases.mdx +++ b/docs/development/releases.mdx @@ -20,7 +20,7 @@ Major versions represent fundamental shifts. FastMCP 2.x is entirely different f Unlike traditional semantic versioning, minor versions **may** include [breaking changes](#breaking-changes) when necessary for the ecosystem's evolution. This flexibility is essential in a young ecosystem where perfect backwards compatibility would prevent important improvements. </Warning> -FastMCP always targets the most current MCP Protocol version. Breaking changes in the MCP spec or MCP SDK automatically flow through to FastMCP - we prioritize staying current with the latest features and conventions over maintaining compatibility with older protocol versions. +FastMCP tracks the current MCP Protocol version while serving earlier handshake versions alongside it. Building on MCP SDK v2, a FastMCP server negotiates the protocol era each client speaks — the sessionless `2026-07-28` era and earlier session-based eras are both handled by the same server. New features and conventions from the spec flow through to FastMCP as they land; for the details of which capabilities are available on each era, see [Upgrading from FastMCP 3](/getting-started/upgrading/from-fastmcp-3#protocol-version-support). **Patch (2.0.x)**: Bug fixes and refinements @@ -65,6 +65,8 @@ Our release process is intentionally simple: 2. Generate release notes automatically, and curate or add additional editorial information as needed 3. GitHub releases automatically trigger PyPI deployments +Current-major releases target `main`. Maintenance releases target their release branch, such as `release/3.x` for 3.x patches and `release/2.x` for 2.x patches. Stable releases from `main` update the `published-docs` branch after PyPI publishing succeeds; maintenance releases publish packages and GitHub release notes without repointing the live docs branch. + This automation lets maintainers focus on code quality rather than release mechanics. ### Release Cadence diff --git a/docs/development/tests.mdx b/docs/development/tests.mdx index 4653368be..d3ade170c 100644 --- a/docs/development/tests.mdx +++ b/docs/development/tests.mdx @@ -228,7 +228,7 @@ async def test_tool_schema_generation(): return {"amount": amount, "tax": amount * rate, "total": amount * (1 + rate)} tools = mcp.list_tools() - schema = tools[0].inputSchema + schema = tools[0].input_schema # First run: snapshot() is empty, gets auto-populated # Subsequent runs: compares against stored snapshot diff --git a/docs/development/v3-notes/v3-features.mdx b/docs/development/v3-notes/v3-features.mdx index 3d656248a..74ac5b082 100644 --- a/docs/development/v3-notes/v3-features.mdx +++ b/docs/development/v3-notes/v3-features.mdx @@ -1205,8 +1205,8 @@ When `list_page_size` is set, `tools/list`, `resources/list`, `resources/templat ```python async with Client(server) as client: result = await client.list_tools_mcp() - while result.nextCursor: - result = await client.list_tools_mcp(cursor=result.nextCursor) + while result.next_cursor: + result = await client.list_tools_mcp(cursor=result.next_cursor) ``` Documentation: [Pagination](/servers/pagination) @@ -1426,7 +1426,7 @@ Prompt functions now use `Message` instead of `mcp.types.PromptMessage`: ```python # v2.x -from mcp.types import PromptMessage, TextContent +from fastmcp.types import PromptMessage, TextContent @mcp.prompt def my_prompt() -> PromptMessage: diff --git a/docs/development/v4-notes/change-register.mdx b/docs/development/v4-notes/change-register.mdx new file mode 100644 index 000000000..bd8e94ee5 --- /dev/null +++ b/docs/development/v4-notes/change-register.mdx @@ -0,0 +1,278 @@ +--- +title: Change Register +--- + +This is the complete register of user-facing changes from the MCP Python SDK v2 migration ([PR #4437](https://github.com/PrefectHQ/fastmcp/pull/4437)), organized by subsystem. It doubles as a review lens: take one subsystem, read its claimed changes, and verify each against the diff. + +Each entry is tagged **Absorbed** (public surface unchanged), **Bridged** (shim keeps old code working, usually warning), **Breaking** (user code must change), or **Deprecated** (works, warns, slated for removal). See the [overview](/development/v4-notes/index) for what each disposition means. + +**Empirical validation (WS2 upgrade reality-check).** The register's compatibility claims are verified, not predicted. Running unchanged 3.x-era code against this branch, all 11 upgrade scenarios pass or warn — the only failures are the two predicted breaks, user `mcp.types` imports and positional `McpError(ErrorData(...))` construction. Cross-version wire interop between a 3.4.3 peer and this branch is bidirectionally clean across 9 operations (3.4.3 client ↔ v4 server and v4 client ↔ 3.4.3 server over HTTP). All 25 `_ALIASES` bridge entries warn correctly with actionable messages. + +## Environment + +### Dependency floors: pydantic >= 2.12, Starlette >= 1.0 — Breaking (environment) + +The SDK v2 raises FastMCP's dependency floors. Projects pinning an older pydantic (e.g. `2.11.*`) hit an unsatisfiable-resolution error at install time and must bump their pin; unpinned projects get pydantic upgraded silently. The server extra floors Starlette at `>=1.0.1` — modern FastAPI (0.11x+) already runs Starlette 1.x, so coexistence is clean (verified with FastAPI 0.138.2); only very old FastAPI pinned below Starlette 1.0 conflicts. Both are documented in the [upgrade guide's Environment requirements](/getting-started/upgrading/from-fastmcp-3#environment-requirements). + +*Verify:* `fastmcp_slim/pyproject.toml` (`pydantic[email]>=2.12.0` core, `starlette>=1.0.1` server extra); WS2 environment-upgrade scenario. + +## Types and imports + +The SDK v2 split protocol types into a standalone `mcp_types` package and renamed every field from camelCase to snake_case. This is the single largest source of user-facing change, and FastMCP absorbs nearly all of it. + +### `mcp.types` split into `mcp_types` — Breaking (by omission) + +The `mcp.types` module no longer exists. Any `from mcp.types import X` or `import mcp.types` in user code raises `ImportError`. This is the one import change users cannot avoid. + +*Verify:* `fastmcp_slim/fastmcp/types.py`, and grep the diff for the doc migration `from mcp.types import` → `from fastmcp.types import` (30 sites). + +### `fastmcp.types` is the stable home — Bridged + +FastMCP re-exports the protocol types users are most likely to touch from `fastmcp.types`, sourced from `mcp_types` (the `mcp` root package lacks most of them): + +```python +from fastmcp.types import TextContent, Tool, ToolAnnotations, ErrorData +``` + +The re-export set is deliberately limited to names that trace to a documented user import: `TextContent`, `ImageContent`, `AudioContent`, `EmbeddedResource`, `ResourceLink`, `ContentBlock`, `Tool`, `Resource`, `ResourceTemplate`, `Prompt`, `PromptMessage`, `CallToolResult`, `GetPromptResult`, `ReadResourceResult`, `TextResourceContents`, `BlobResourceContents`, `SamplingMessage`, `CreateMessageResult`, `SamplingCapability`, `Root`, `ErrorData`, `Completion`, `Annotations`, `ToolAnnotations`, `Icon`, `ToolResultContent`, plus the pre-existing `Textarea`. Notification and request wrapper types (e.g. `ToolListChangedNotification`) are not re-exported — import those from `mcp_types` directly. + +*Verify:* `fastmcp_slim/fastmcp/types.py` `__all__`. + +### camelCase field reads are bridged — Bridged (deprecated) + +Objects FastMCP hands back — results of `client.list_tools()`, `client.call_tool_mcp()`, `client.read_resource()`, and the parameter objects passed to sampling and elicitation handlers — are SDK v2 objects with snake_case fields. A compatibility bridge installed at import time routes the old camelCase names to their snake_case fields, warning once per read: + +```python +from fastmcp import Client + + +async def read_schema(): + async with Client("my_mcp_server.py") as client: + tools = await client.list_tools() + return tools[0].inputSchema # works, warns; prefer .input_schema +``` + +The bridged fields are exactly those users read, data-driven from an `_ALIASES` table: `inputSchema`/`outputSchema` (Tool); `mimeType` (Resource, ResourceTemplate, TextResourceContents, BlobResourceContents, ImageContent, AudioContent) and `uriTemplate` (ResourceTemplate); `isError`/`structuredContent` (CallToolResult); `hasMore` (Completion); `serverInfo`/`protocolVersion` (InitializeResult); `nextCursor`/`resourceTemplates` (List\*Result); `systemPrompt`/`maxTokens`/`stopSequences`/`modelPreferences`/`toolChoice` (CreateMessageRequestParams); `requestedSchema` (ElicitRequestFormParams). WS2 verified all 25 alias entries warn correctly with actionable messages. + +*Verify:* `fastmcp_slim/fastmcp/_compat.py` (the `_ALIASES` table and `install()`). + +### The bridge is a genuine runtime toggle — Absorbed (post-review fix) + +The bridge properties install unconditionally, and each getter reads the live `mcp_camelcase_compat` setting on every access: warn-and-return when enabled, raise `AttributeError` when disabled. An earlier version installed the bridge once at import, so flipping the setting afterward did nothing — commit `d9659453` fixed this so the toggle works at runtime: + +```python +import fastmcp + +fastmcp.settings.mcp_camelcase_compat = False # now takes effect immediately +``` + +The setting is documented in [Settings](/more/settings) as `FASTMCP_MCP_CAMELCASE_COMPAT`. + +*Verify:* `fastmcp_slim/fastmcp/settings.py` (setting), `fastmcp_slim/fastmcp/_compat.py` (per-read gate), commit `d9659453`. + +### `mcp-types` is now a core slim dependency — Absorbed (post-review fix) + +Bare `import fastmcp` loads `mcp_types` via `_sdk_patches` and `_compat`, so a bare `fastmcp-slim` install (without the `[mcp]` extra) hit `ModuleNotFoundError`. Because `mcp-types` only pulls `pydantic` and `typing-extensions` (already core), it was promoted to a core dependency while the full `mcp` SDK stays in the `[mcp]` extra. + +*Verify:* `fastmcp_slim/pyproject.toml` (`mcp-types==2.0.0b1` in core dependencies), commit `e16ffad4`. + +### `McpError` is an alias; construction changed — Bridged (catch) / Breaking (construct) + +`fastmcp.exceptions.McpError` is a plain alias of the SDK's `MCPError` — a plain alias, not a subclass, so `except McpError` still catches SDK-raised errors and `err.error.code` still reads: + +```python +from fastmcp.exceptions import McpError + +try: + ... +except McpError as err: + print(err.error.code) # unchanged +``` + +Construction is the one unavoidable behavior break. The v1 pattern of wrapping an `ErrorData` positionally raises `TypeError` under v2; construct with keywords instead: + +```python +from fastmcp.exceptions import McpError + +# Before (raises TypeError under SDK v2): +# raise McpError(ErrorData(code=-32000, message="Client not supported")) + +raise McpError(code=-32000, message="Client not supported") +``` + +*Verify:* `fastmcp_slim/fastmcp/exceptions.py` (`McpError = MCPError`). + +## Server core + +The SDK v2 rewrote the server request-handling model. FastMCP's handler layer is the most heavily rewritten part of the migration, but the public server API is unchanged. + +### Handler adapters — Absorbed + +Handlers are now registered by method string via `add_request_handler(method, params_type, handler)`, take a uniform `(ctx, params)` signature, and return the **bare** result model (no `ServerResult` wrapper). FastMCP's `_setup_handlers` builds one thin adapter per method (`tools/list`, `tools/call`, `resources/read`, `prompts/get`, `logging/setLevel`, …) that binds the request context, adapts params to the existing handler body, and returns the bare result. The v1 decorator overrides and `_wrap_list_handler` are deleted. + +*Verify:* `fastmcp_slim/fastmcp/server/low_level.py` (462 lines changed), `fastmcp_slim/fastmcp/server/mixins/mcp_operations.py`. + +### FastMCP-owned request context — Absorbed + +The SDK's `request_ctx` ContextVar is gone; the SDK passes context to handlers as an argument only. FastMCP owns its own `fastmcp_request_ctx` ContextVar, set at the top of every adapter. It stores a FastMCP-owned `FastMCPRequestContext` wrapper rather than the raw SDK context, because the raw `ServerRequestContext.meta` is a bare `TypedDict` carrying only `progress_token` — the full `_meta` block (which holds `_meta.fastmcp.version` and the distributed-trace parent) has to be lifted out of the raw params dict. `Context.request_context` and its consumers (`report_progress`, `session_id`, telemetry trace extraction, `get_http_request`) all read through the wrapper. + +*Verify:* `fastmcp_slim/fastmcp/server/dependencies.py`, `server/context.py`, `server/telemetry.py`. + +### `ServerMiddleware` bridge for `initialize` — Absorbed + +Server-side middleware is a new first-class SDK concept: `Server.middleware` is a list of `ServerMiddleware` composed around every request and notification, including `initialize`. FastMCP no longer subclasses `ServerSession` (the runner constructs it), so the old `MiddlewareServerSession._received_request` override is gone. A `FastMCPServerMiddleware` is appended to the SDK's middleware list (preserving the SDK's own OpenTelemetry middleware) and intercepts `initialize` to run FastMCP's middleware chain. The v2 seam is cleaner — `call_next(ctx)` returns the serialized result directly, so the old `capturing_respond` machinery is deleted. + +*Verify:* `fastmcp_slim/fastmcp/server/low_level.py` (`FastMCPServerMiddleware`). + +### Per-session state re-homed to the connection — Absorbed + +Because `ServerSession` is now per-request, per-session state can no longer live on the session object. The minimum logging level is re-homed to a FastMCP-side map keyed by session id (via `connection.session_id`), and `client_supports_extension` becomes a free function reading `session.client_params.capabilities`. + +*Verify:* `fastmcp_slim/fastmcp/server/low_level.py`, `server/context.py` (`_log_to_server_and_client`). + +### `extensions` capability read from the real field — Absorbed (post-review fix) + +SDK v2 declares `extensions` as a real field on `ClientCapabilities`, so a client sending `ClientCapabilities(extensions={...})` populates the field, not `model_extra`. `client_supports_extension` now reads `caps.extensions` first and falls back to `model_extra` only for legacy-serialized clients. + +*Verify:* commit `96ca0092`, `server/low_level.py` / `server/context.py`. + +### Task protocol and the `_sdk_patches` shim — Absorbed (with an upstream gap) + +The SEP-1686 task CRUD protocol (`tasks/get`, `tasks/result`, `tasks/list`, `tasks/cancel`) is entirely FastMCP-owned — the SDK ships no task store. Task detection moves to a params field: `params.task is not None` on `CallToolRequestParams`, with `ttl` from `params.task.ttl`. The four task handlers port to `add_request_handler`. + +The SDK has a real gap here (see [Known Gaps](/development/v4-notes/known-gaps) and sdk-feedback #1): it ships the task result types but omits them from the method registries, so a background-task `tools/call` returning a `CreateTaskResult` fails validation. FastMCP installs a registry-widening shim in `_sdk_patches.py` that adds `CreateTaskResult` to the `tools/call` result union and registers the `tasks/*` rows. It is a temporary patch with a self-documented removal trigger. + +Resources and prompts have **no `task` field** on their params in b1, so task-augmented resource reads and prompt gets are not wire-expressible — a documented capability regression, tracked by xfails, not a bug FastMCP fixes. + +*Verify:* `fastmcp_slim/fastmcp/_sdk_patches.py`, `server/tasks/*`. + +## Client + +The `fastmcp.Client` public API is preserved exactly. The client stays a wrapper around `mcp.ClientSession` in legacy/handshake mode; the first-class `mcp.client.Client` is deliberately not adopted in this PR. + +### Transports yield 2-tuples — Absorbed + +All SDK transports (`streamable_http_client`, `sse_client`, `stdio_client`) now yield a 2-tuple `(read, write)` instead of exposing a third `get_session_id` element. HTTP configuration flows through a caller-supplied `http_client=`. Only the tuple unpack changed on the FastMCP side. + +*Verify:* `fastmcp_slim/fastmcp/client/transports/http.py`, `transports/sse.py`, `transports/stdio.py`. + +### Float timeouts; `timedelta` still accepted — Absorbed + +The SDK session and call timeouts are now plain floats. FastMCP's public `Client(timeout=...)` still accepts a `timedelta`, a plain float, or an int, normalizing through the existing `normalize_timeout_to_seconds` at the `SessionKwargs` chokepoint: + +```python +from datetime import timedelta + +from fastmcp import Client + +client = Client("my_mcp_server.py", timeout=timedelta(seconds=30)) # still works +client = Client("my_mcp_server.py", timeout=30.0) # also works +``` + +*Verify:* `fastmcp_slim/fastmcp/client/transports/base.py` (`SessionKwargs.read_timeout_seconds: float | None`), `client/client.py`. + +### `get_session_id` via header sniff — Bridged + +The SDK dropped `get_session_id` from the streamable-HTTP transport with no replacement (the SDK source has an author TODO acknowledging it breaks the Transport protocol). FastMCP reconstructs it by registering an httpx response event hook on the client it owns, capturing the `mcp-session-id` response header. The removal trigger is the upstream TODO. + +*Verify:* `fastmcp_slim/fastmcp/client/transports/http.py` (`_capture_session_id`, `get_session_id`). + +### Pagination via `params=` — Absorbed + +The SDK's `cursor=` kwarg on `list_*` is gone; pagination now flows through `params=PaginatedRequestParams(cursor=...)`. FastMCP's public `cursor=` on the `list_*_mcp` methods is preserved and translated internally. + +*Verify:* `fastmcp_slim/fastmcp/client/mixins/{tools,resources,prompts}.py`. + +### OAuth `callback_handler` returns `AuthorizationCodeResult` — Breaking (advanced) + +The one OAuth break: a custom `callback_handler` must return an `AuthorizationCodeResult` (fields `code`, `state`, `iss`) instead of the old `tuple[str, str | None]`. Everything else in the OAuth surface — `OAuthClientProvider` kwargs, `TokenStorage`, `async_auth_flow` — is unchanged. + +*Verify:* `fastmcp_slim/fastmcp/client/auth/oauth.py`. + +### Notification dispatch unwrapped — Absorbed + +The client's notification handling was reworked for the v2 message model. Custom server-to-client notifications (like SEP-1686 `notifications/tasks/status`) are no longer tee'd to a user `message_handler` — the SDK routes them only through `NotificationBinding` (see sdk-feedback #8). FastMCP registers a binding so task-status updates reach the Task registry. + +*Verify:* `fastmcp_slim/fastmcp/client/messages.py`, `client/tasks.py`. + +### `SDKServer` alias — Absorbed (post-review rename) + +The in-memory transport resolves the low-level server per server type. The alias for the SDK's own `MCPServer` was renamed from the misleading `FastMCP1Server` / `FastMCP1x` to `SDKServer`, since it names the SDK v2 server, not a FastMCP 1.x object. + +*Verify:* commit `5c3b82e4`; `client/client.py`, `client/transports/memory.py`, `server/providers/proxy.py`, `cli/run.py`. + +### Proxy request-context stash — Absorbed (post-review fix) + +Proxy forwarding handlers stash the request context so a backend that issues a server-initiated request (list_roots/sampling/elicitation) can relay it back to the proxy's own client. This stash was initially applied only on the tool path; commit `1ac166bd` extended it to proxied resources, templates, and prompts. + +*Verify:* commit `1ac166bd`, `server/providers/proxy.py`. + +## HTTP + +The maintainer asked whether FastMCP can now delete its custom HTTP app and let the SDK's `Server.streamable_http_app()` handle everything. The answer for this PR is **no** — every override earns its keep. Convergence is a v4 project gated on three upstream additions (see [Feature Program](/development/v4-notes/feature-program)). + +### Kept overrides — Absorbed + +Four overrides survive, each for a concrete reason: + +1. **Event-store session scoping.** The SDK hands every per-session transport the *same* `event_store` object, one stream-ID keyspace shared across sessions. FastMCP's `FastMCPStreamableHTTPSessionManager` returns a fresh `SessionScopedEventStore(shared, session_id=…)` per session, so resumability events don't leak across sessions. +2. **Lifespan reconciliation.** The SDK builder enters the bare lowlevel `Server.lifespan` (which yields `{}`). FastMCP drives its own `_lifespan_manager` — ref-counted for mounts, Ctrl-C-shielded, docket-aware. The SDK path silently skips all of it, so FastMCP sets the server lifespan to delegate to `_lifespan_manager` and lets the manager enter it once. +3. **Graceful transport termination.** FastMCP's lifespan `finally` drains the manager's server instances via `transport.terminate()` before task-group cancel, fixing the Uvicorn "returned without completing response" edge (#3025). The SDK just cancels. +4. **User ASGI middleware hook.** The SDK builder hardcodes an empty middleware list and only appends auth. FastMCP's `http_app(middleware=...)` and `RequestContextMiddleware` have nowhere to go in the SDK path. + +*Verify:* `fastmcp_slim/fastmcp/server/http.py`, `server/event_store.py`, `server/mixins/lifespan.py`. + +### DNS-rebinding ownership — Absorbed (security) + +FastMCP owns DNS-rebinding protection through its `HostOriginGuardMiddleware`, which is more expressive than the SDK's and is the documented surface. To avoid two allowlists double-blocking with confusing errors from two layers, FastMCP **always** disables the SDK's layer by passing `TransportSecuritySettings(enable_dns_rebinding_protection=False)` to the manager — both when FastMCP's protection is on (so they don't double-block) and when it's off (so the SDK's default-on flip can't silently re-enable it). + +*Verify:* `fastmcp_slim/fastmcp/server/http.py` (`enable_dns_rebinding_protection=False`, `HostOriginGuardMiddleware`). + +## Protocol eras + +The SDK v2 serves multiple protocol eras from one server, and FastMCP formally embraces this. + +### Dual-era serving — Absorbed (supersedes "latest only") + +A single FastMCP server now handles clients across the protocol transition: the session-based handshake eras (through 2025-11-25) and the sessionless `2026-07-28` era (capability discovery via `server/discover`) simultaneously. This supersedes FastMCP's earlier "latest protocol only" stance. + +### Per-feature era matrix — Breaking (feature availability by era) + +The push-style Context features that require the server to call back into the client are unavailable on the sessionless `2026-07-28` era, because that era removes server-initiated requests (SEP-2577). The request/response features flow on every era. + +| Context feature | Session-based eras | `2026-07-28` (sessionless) | +| --- | --- | --- | +| `ctx.info` / logging notifications | Supported | Supported | +| Tools, resources, prompts, completions | Supported | Supported | +| `ctx.elicit` | Supported | Not yet — MRTR rewrite pending | +| `ctx.sample` | Supported | Not yet — being removed in 4.0 | +| `ctx.list_roots` | Supported | Not yet — MRTR rewrite pending | +| Tasks (via the FastMCP client) | Supported | Not yet | + +Tools that rely on `ctx.elicit`, `ctx.sample`, or `ctx.list_roots` continue to work against clients on the session-based eras. + +Ordinary `ctx.info` and `ctx.sample` usage now emits an SDK-level `MCPDeprecationWarning` ("The logging/sampling capability is deprecated as of 2026-07-28 (SEP-2577)"). The warnings come from the SDK, not FastMCP, and are benign — the features keep working on session-based connections per the matrix. Users will see them and wonder, so the upgrade guide calls them out explicitly. + +Wire interop across the transition is verified: a 3.4.3 client against a v4 server and a v4 client against a 3.4.3 server are bidirectionally clean across 9 operations over HTTP (WS2). + +*Verify:* `docs/getting-started/upgrading/from-fastmcp-3.mdx` (the published matrix and SDK-warning note), `tests/server/test_protocol_eras.py`. + +### Push-feature degradation quality — Known gap + +The degradation error differs by feature on a `2026-07-28` connection: `ctx.list_roots` raises a clear `NoBackChannelError`, while `ctx.elicit` / `ctx.sample` surface a bare "Method not found" because those methods were removed from the 2026 server-request registry. This is sdk-feedback #10 and is captured by a strict xfail in `test_protocol_eras.py`. FastMCP's planned fix is to era-gate `ctx.elicit`/`ctx.sample` to raise a clear message before the wire. + +*Verify:* `tests/server/test_protocol_eras.py:319` (strict xfail referencing sdk-feedback #10). + +### The xfail register — Known gap + +Roughly forty `xfail` markers across the test tree (concentrated in `tests/server/tasks/`, `tests/client/tasks/`, and `test_protocol_eras.py`) are the built-in beta tracker: each names the SDK gap it waits on. They are enumerated and mapped to sdk-feedback findings on the [Known Gaps](/development/v4-notes/known-gaps) page. + +## Security + +FastMCP retains hardening that is not yet upstream and does not remove it during the migration. + +### Retained OAuth / DCR hardening — Absorbed + +FastMCP keeps its own DCR redirect-URI hardening (PRs #4419, #4408) regardless of the SDK's validation, which still accepts unsafe `javascript:`/`data:` redirect schemes at the model level (sdk-feedback #4). The streamable-HTTP DNS-rebinding protection above is a second retained security surface. When HTTP convergence lands in v4, FastMCP would additionally *inherit* the SDK's session-owner credential enforcement — a security gain it lacks today (see [Feature Program](/development/v4-notes/feature-program)). + +*Verify:* recent commits `67527c1f` (block unsafe OAuth redirect schemes), `57a27992` (DNS rebinding), `cccb529f` (DCR redirect URI validation) on `main`. diff --git a/docs/development/v4-notes/feature-program.mdx b/docs/development/v4-notes/feature-program.mdx new file mode 100644 index 000000000..57501562a --- /dev/null +++ b/docs/development/v4-notes/feature-program.mdx @@ -0,0 +1,129 @@ +--- +title: Feature Program +--- + +The migration is the foundation. The forward v4 program is a sequence of post-merge PRs that build on it. Each feature below carries an explicit status: + +- **Designed** — the approach is settled and an API sketch exists; implementation has not started. +- **Planned** — the shape is agreed but design details remain open. +- **Not started** — identified as v4 scope, not yet designed. + +Code blocks marked as sketches show the *intended* API and do not resolve against the current tree. + +## Sampling: deprecate now, remove in 4.0 + +**Status: Designed.** + +Sampling is the push-shaped API where a server borrows the client's model mid-call (`ctx.sample`, `ctx.sample_step`). The `2026-07-28` era removes server-initiated requests, so this API cannot work on modern connections. Background-task sampling is already dead under v2 — a worker's back-channel is gone once the submitting request returns, and no sampling relay was ever built (sdk-feedback #9). + +The plan is Option A: **deprecate the push-sampling API now and remove it in the 4.0 release.** + +- Deprecate `ctx.sample` / `ctx.sample_step` and the server sampling module now. +- Era-gate them to raise a clear error on `2026-07-28` (this also fixes the opaque "Method not found" of sdk-feedback #10). +- Remove `ctx.sample`, `ctx.sample_step`, `server/sampling/`, `SamplingTool`, and structured-result sampling in 4.0. + +The migration story is honest: there is **no drop-in** on modern connections. The guidance is architectural — call an LLM from your server directly, with your own API key, rather than borrowing the client's model. That shift is the real answer, and it is why the removal justifies a major version. + +The client-side provider handlers (Anthropic, OpenAI, Google GenAI) are **retained** regardless: MRTR needs them to answer sampling input-requests from the client side. What is removed is the server-side push emitter, which the SDK never built for the modern era. + +In this PR, sampling still functions on the legacy eras. Users already see an SDK-level `MCPDeprecationWarning` on ordinary `ctx.sample` usage (the SDK deprecated the capability wire-side per SEP-2577, verified empirically by WS2), but FastMCP's own deprecation — warnings with migration guidance, plus the era-gating — lands as the first follow-up PR. + +## MRTR elicitation + +**Status: Designed. Flagship feature.** + +Elicitation survives the modern era, but only declaratively. The 2026 wire envelope still carries elicitation as a multi-round input-request (MRTR — multi-round tool result). Imperative `ctx.elicit` relies on the session back-channel, which is gone on `2026-07-28` foreground calls; on the modern era, elicitation is reachable only through a declarative resolver. + +The design does both, so the imperative DX survives where it can and a declarative surface covers the modern era: + +**1. Keep `ctx.elicit` as the primary imperative DX,** re-plumbed to be era-aware: legacy connections use the session elicit-form path; background tasks on any era use the existing Redis relay (the task's `input_required` status *is* the MRTR suspension boundary); foreground calls on `2026-07-28` raise a clear era-aware error pointing at the declarative form. + +**2. Add a declarative surface** in a new `fastmcp.elicitation` module — `Resolve`, `Elicit`, and `ElicitationResult` — thin wrappers over the SDK's resolver, wired into FastMCP's own tool layer (FastMCP tools do not inherit the SDK's auto-resolver wiring). + +The intended DX (sketch — the module does not exist yet): + +```python test="skip" +from typing import Annotated + +from pydantic import BaseModel + +from fastmcp import FastMCP, Context +from fastmcp.elicitation import Resolve, Elicit, ElicitationResult + +mcp = FastMCP("shipping") + + +class Address(BaseModel): + street: str + city: str + zip: str + + +async def ask_address(ctx: Context) -> Elicit[Address]: + return Elicit("Where should we ship this order?", Address) + + +@mcp.tool +async def create_shipment( + order_id: str, + address: Annotated[Address, Resolve(ask_address)], # unwrapped; decline -> ToolError +) -> str: + return f"Shipping {order_id} to {address.city}" + + +@mcp.tool +async def maybe_ship( + order_id: str, + address: Annotated[ElicitationResult[Address], Resolve(ask_address)], # full outcome +) -> str: + if address.action != "accept": + return "cancelled" + return f"Shipping {order_id} to {address.data.city}" + + +@mcp.tool(task=True) +async def slow_ship(ctx: Context) -> str: + # imperative ctx.elicit survives 2026 via the background-task relay + result = await ctx.elicit("Confirm address", Address) + if result.action == "accept": + return f"Shipping to {result.data.city}" + return "cancelled" +``` + +The registration path detects `Annotated[_, Resolve(...)]` parameters, builds resolver plans, and returns the SDK's `InputRequiredResult` instead of the tool body on the first round. The FastMCP client already dispatches input-requests through its elicitation callback; the follow-up work confirms the FastMCP client wrapper drives the input-required driver the way the SDK's own client does. + +The divergence between elicitation and sampling on 2026 comes down to one fact: the SDK built the server-side emitter for elicitation (`Elicit`/`Resolve`) and not for sampling. The wire carries all three input-request types and the client dispatches all three; only elicitation can produce one server-side. That is why elicitation survives 4.0 via MRTR and push-sampling does not. + +## Middleware on the SDK `ServerMiddleware` seam + +**Status: Planned.** + +The migration already routes `initialize` interception through the SDK's new `ServerMiddleware` seam via `FastMCPServerMiddleware`. The forward work is to lean into that seam more fully — moving more of FastMCP's request-lifecycle middleware onto the native SDK composition point rather than FastMCP-side wrappers, now that the SDK composes middleware around every request and notification. + +## First-class 2026 client + +**Status: Planned.** + +The migration keeps `fastmcp.Client` as a wrapper around `mcp.ClientSession` in legacy/handshake mode. The v4 client work adopts the SDK's first-class `mcp.client.Client`: a `mode='auto'` that negotiates the era, `discover()` for sessionless capability discovery, and the MRTR input-required driver so the client can answer multi-round elicitation and sampling input-requests. This is the client-side half of full `2026-07-28` support. + +This workstream also owns the server-side statelessness design holes — `ctx.session_id` / `set_state` round-tripping, task push and background elicitation, and stateful-proxy affinity — since all three turn on the same "what is a session without a session?" question. See [Statelessness on 2026-07-28](/development/v4-notes/known-gaps#statelessness-on-2026-07-28) for the full accounting. + +## Subscriptions, cache hints, extensions, OTel + +**Status: Not started.** + +A cluster of protocol features tracked for v4 once the core client and elicitation work lands: a `subscriptions/listen` surface backed by a subscription bus, resource cache hints, reconciliation of the `extensions` / MCP Apps capability advertisement across eras (the `extensions` capability is stripped at pre-2026 negotiated versions today — sdk-feedback #2), and the OpenTelemetry integration re-checked against the SDK's own OTel middleware. + +## SDK delegation, round two + +**Status: Planned (gated on upstream).** + +The real HTTP simplification is a v4 project, not this PR. FastMCP can collapse its `create_streamable_http_app` onto the SDK's `Server.streamable_http_app()` once upstream adds three things: + +1. per-session event-store scoping, +2. a user-middleware injection hook, +3. a lifespan hook. + +The payoff is not only less code — FastMCP would also inherit the SDK's session-owner credential enforcement, a security gain it lacks today. These are the three upstream feature requests to file (alongside the advisory dossier described in [Known Gaps](/development/v4-notes/known-gaps)). Until they land, the four HTTP overrides in the [Change Register](/development/v4-notes/change-register#http) stay. + +One latent capability worth surfacing on FastMCP's side: `session_idle_timeout` is accepted by the manager but never set by `create_streamable_http_app` — a one-line plumb if FastMCP wants to expose it. diff --git a/docs/development/v4-notes/index.mdx b/docs/development/v4-notes/index.mdx new file mode 100644 index 000000000..1cbebfdcd --- /dev/null +++ b/docs/development/v4-notes/index.mdx @@ -0,0 +1,37 @@ +--- +title: v4.0 Development Notes +--- + +This directory is the working map of FastMCP v4.0: the complete register of user-facing changes from the MCP Python SDK v2 migration ([PR #4437](https://github.com/PrefectHQ/fastmcp/pull/4437)), plus the forward v4 feature program. It plays three roles at once. + +1. **A change register.** Every user-visible change from the migration, organized by subsystem, with a note on how FastMCP handles it (absorbed, bridged, breaking, or deprecated) and where to find it in the diff. This is the [Change Register](/development/v4-notes/change-register). +2. **A feature program.** The forward v4 work — sampling removal, MRTR elicitation, the first-class 2026 client, and the SDK-delegation round-two convergence — each with an explicit status. This is the [Feature Program](/development/v4-notes/feature-program). +3. **A review lens.** Because the migration PR is too large to review line by line, the change register is organized so a reviewer can take one subsystem, read its claimed changes, and verify each against the diff. The [Known Gaps](/development/v4-notes/known-gaps) page collects the deliberate xfails and the upstream dependencies that gate the follow-up work. + +## Why v4 exists + +FastMCP v4.0 is an engine swap. Three forces drive the major version: + +**The MCP Python SDK v2 rebuild.** The SDK v2 makes two sweeping changes to the protocol layer: it splits the protocol types out of `mcp.types` into a standalone `mcp_types` package, and it renames every protocol field from camelCase to snake_case (`inputSchema` → `input_schema`, `mimeType` → `mime_type`, `isError` → `is_error`). It also rewrites the server request-handling model — handlers are now registered by method string and return bare result models, there is no `request_ctx` ContextVar, and server-side middleware is a first-class SDK concept. FastMCP absorbs almost all of this so that a typical server needs zero code changes. + +**Protocol version 2026-07-28.** The SDK v2 serves multiple protocol eras from one server. Alongside the session-based handshake eras, it introduces the sessionless `2026-07-28` era, which discovers capabilities through `server/discover` and removes server-initiated requests (SEP-2577). This formally supersedes FastMCP's earlier "latest protocol only" stance: a single server now works with clients across the protocol transition. + +**Sampling removal.** The `2026-07-28` era removes the server's ability to push a request back to the client mid-call. That takes the push-shaped sampling API (`ctx.sample`, `ctx.sample_step`) off the table on modern connections. Rather than leave it half-working, v4 deprecates it now and removes it in the 4.0 release — a real architectural shift for servers that borrowed the client's model, and one that justifies the major bump. + +## Release strategy + +The migration merges to `main` and development continues there with subsequent PRs. Releases follow the SDK's own beta timeline: + +- **`main` carries the beta pins.** While the SDK is on `mcp==2.0.0b1` / `mcp-types==2.0.0b1`, `main` cuts **pre-releases** (`4.0.0b1`, `4.0.0b2`, …). No stable PyPI release goes out until `mcp 2.0.0` reaches GA — at which point the pins swap to the stable SDK and `4.0.0` ships. The pin-swap is a tracked checklist item on the [Known Gaps](/development/v4-notes/known-gaps) page. +- **`release/3.x` is the maintenance line.** A `release/3.x` branch is cut from pre-merge `main`. It stays on the SDK v1 line, receives upstream security patches, and serves users who cannot move to the SDK v2 beta yet. + +## How to read the register + +Each subsystem section in the [Change Register](/development/v4-notes/change-register) tags its changes with one of four dispositions: + +- **Absorbed** — the SDK changed underneath, but FastMCP's public surface is identical. Nothing for users to do. +- **Bridged** — a compatibility shim keeps old code working, usually with a `FastMCPDeprecationWarning`. Users should migrate but are not forced to. +- **Breaking** — user code must change. These are the headline migration items. +- **Deprecated** — still works, warns now, slated for removal in a later release. + +The user-facing summary of the migration lives in the published [Upgrading from FastMCP 3](/getting-started/upgrading/from-fastmcp-3) guide. These development notes are the exhaustive version behind it. diff --git a/docs/development/v4-notes/known-gaps.mdx b/docs/development/v4-notes/known-gaps.mdx new file mode 100644 index 000000000..3f2df1a9c --- /dev/null +++ b/docs/development/v4-notes/known-gaps.mdx @@ -0,0 +1,91 @@ +--- +title: Known Gaps and Upstream Dependencies +--- + +The migration ships with a set of deliberate gaps: temporary shims, xfailed tests, and pins that depend on the MCP Python SDK v2 reaching GA. Each is tracked here with its removal trigger. This page is the checklist for the beta-to-stable transition and the advisory relationship with the SDK team. + +## The xfail register + +Roughly forty `xfail` markers across the test tree are the built-in beta tracker. Each names the SDK gap it waits on, so re-running the suite against a new SDK beta surfaces exactly which gaps have closed (a strict xfail that starts passing fails the suite, prompting removal of the marker). They cluster in three areas. + +**Task suite (`tests/server/tasks/`, `tests/client/tasks/`).** The large majority. These trace to two SDK gaps: + +- **sdk-feedback #1** — SEP-1686 ships the task result types but omits them from the method registries, so a task-augmented `tools/call` cannot complete validation. FastMCP's `_sdk_patches.py` registry-widening shim covers the common tool path; the xfails cover paths the shim intentionally does not paper over. +- **sdk-feedback #3** — `ReadResourceRequestParams` and `GetPromptRequestParams` have no `task` field, so task-augmented resource reads and prompt gets are not wire-expressible. The xfails in `test_task_resources.py`, `test_task_prompts.py`, `test_client_resource_tasks.py`, and `test_client_prompt_tasks.py` carry the reason "SDK v2 has no `task` field on GetPromptRequestParams / ReadResourceRequestParams." + +**Protocol eras (`tests/server/test_protocol_eras.py`).** Two strict xfails: + +- The strict xfail at `test_protocol_eras.py:319` maps directly to **sdk-feedback #10**: on `2026-07-28`, `ctx.elicit`/`ctx.sample` attach a `related_request_id` and surface a bare "Method not found" rather than a clear era-aware error. It stays strict until the SDK unifies the degradation path or FastMCP era-gates the calls. +- The strict xfail at `test_protocol_eras.py:400` covers the SDK's first-class high-level client (`mcp.client.Client`) and the sessionless driver that the FastMCP client does not yet adopt (see the [first-class 2026 client](/development/v4-notes/feature-program#first-class-2026-client) feature). + +**MCP Apps (`tests/test_apps.py`).** Two xfails tied to **sdk-feedback #2** — the `extensions` capability is stripped by the pre-2026 version sieve, so the UI extension can't be advertised to legacy-era clients. + +## Shims and their removal triggers + +Every shim in the migration is temporary and carries a documented removal trigger. + +| Shim | Location | Removal trigger | +| --- | --- | --- | +| `_sdk_patches.py` — task registry widening | `fastmcp_slim/fastmcp/_sdk_patches.py` | SDK adds `tasks/*` rows and `CreateTaskResult` to the `tools/call` result union (sdk-feedback #1). | +| `_compat.py` — camelCase field bridge | `fastmcp_slim/fastmcp/_compat.py` | User-migration aid; removed in a future release after users migrate reads to snake_case. Users can preview removal with `mcp_camelcase_compat = False`. | +| `FastMCPRequestContext` ContextVar | `fastmcp_slim/fastmcp/server/dependencies.py` | The SDK deliberately passes context as an argument with no ContextVar; FastMCP's public `get_context()` needs ambient access, and the shim also lifts `_meta`, which the SDK's `TypedDict` drops. No planned removal — this is a permanent boundary, not a beta gap. | +| `FastMCPServerMiddleware` | `fastmcp_slim/fastmcp/server/low_level.py` | Already the native SDK `ServerMiddleware` path; no cleaner hook exists. Permanent. | +| Client `get_session_id` header sniff | `fastmcp_slim/fastmcp/client/transports/http.py` | SDK exposes session id (or an `on_session_created` callback) from `streamable_http_client`, at parity with `sse_client` (sdk-feedback #5). | +| `_sdk_context_shim.py` — generic handler aliases | `fastmcp_slim/fastmcp/client/_sdk_context_shim.py` | The SDK's `ClientRequestContext` is not subscriptable, so FastMCP keeps the public generic `SamplingHandler`/`RootsHandler`/`ElicitationHandler` aliases. Permanent unless the SDK makes the context subscriptable (sdk-feedback #7). | + +The `TaskNotificationHandler` binding (sdk-feedback #8) is the client-side equivalent: it registers a `NotificationBinding` for `notifications/tasks/status` because the SDK no longer tees custom server notifications to the message handler. + +## Statelessness on 2026-07-28 + +The `2026-07-28` era is stateless by protocol construction, and the recurring maintainer question is whether that statelessness has to be woven through FastMCP everywhere. It does not — but the honest accounting has three parts: features that are legacy-only because the protocol removed the mechanism, features that already work because they never relied on a session, and a short list of design holes where the current code *doesn't error* but also *doesn't work*. Everything below concerns `2026-07-28` connections only. Every client in the field today negotiates a handshake era, where all of this behaves exactly as it always has. + +**The SDK ground truth.** On the modern paths the SDK's `Connection` is strictly per-request: a fresh `Connection` is built from each POST's envelope, its `exit_stack` unwinds when the request returns, `connection.session_id` is always `None`, and `connection.state` is a fresh dict per request. The manager's `stateless` flag never enters the picture — modern routing short-circuits ahead of it. There is no standing server→client stream: notifications emitted *during* a request ride that POST's own SSE sink, and anything emitted after the POST returns is dropped (`_NO_CHANNEL`); server→client *requests* raise `NoBackChannelError`. The only replacement is `subscriptions/listen`, which carries four list-changed / resource-updated event kinds and nothing else — no logging, progress, or task-status events, no resumability, and it is not yet wired into FastMCP. There is no `EventStore` or `Last-Event-ID` on modern paths at all; both belong to the legacy transport. + +### Legacy-only by construction — document, don't build + +These are not bugs. The protocol removed the mechanism they depend on, so they are simply out of scope on `2026-07-28`: + +- **Per-session log levels.** `logging/setLevel` is absent from the 2026 method registry, so the `_client_log_levels` handler is unreachable. There is no per-session log-level state because there is no session. +- **`EventStore` / resumability.** `EventStore`, `SessionScopedEventStore`, and Last-Event-ID resumption are never constructed on the modern paths. Resumability presupposes a durable stream, which the era does not have. +- **Ping keepalive.** Server-initiated ping is a server→client request and is therefore structurally a no-op on modern connections; the SDK owns SSE-level pings on this transport. + +### Already stateless by construction — works on 2026 + +These work on `2026-07-28` today because they never leaned on a protocol session: + +- **`tasks/get` polling.** Task result retrieval is keyed by `task_id` and backed by Docket/Redis, so a client polls across independent requests without any session affinity. +- **OAuth bearer validation.** Auth is per-request bearer validation — every POST carries and re-validates its own credential. +- **In-request progress and logging notifications.** Notifications emitted while a request is still streaming ride that POST's SSE sink and are delivered normally. + +### Design holes deferred to the multi-protocol workstream + +The remaining items are real holes, deferred to the [first-class 2026 client](/development/v4-notes/feature-program#first-class-2026-client) workstream because they all reduce to one unanswered question — *what is a session when the protocol has none?* The danger in each is that the code currently returns without erroring, which reads as "works" but is actually silent degradation. Again: these affect `2026-07-28` connections only; on the handshake eras every one of them behaves correctly. + +- **`ctx.session_id` and `ctx.set_state` / `ctx.get_state` (broken even single-replica).** On a modern request `ctx.session_id` mints a fresh `uuid4`, cached on the per-request `connection.state` that is discarded when the request returns. So `ctx.set_state` and `ctx.get_state` silently never round-trip across requests — no error, just lost data. The open design decision is whether `session_id` should become `None` with `set_state` documented as session-era-only, or be re-based on an app-level key (the auth subject, or a client-supplied header). +- **Task push and background elicitation (broken even single-replica).** The initial task-status notification is delivered only while the submitting POST is still streaming; the standalone subscription task pushes into a dead sink and its cleanup fires at request end, and the Redis relay is keyed by the throwaway per-request session id. Elicitation from a background task is impossible on 2026 by protocol construction — it needs an explicit era-gate that raises a clear error rather than hanging. Task-status push on 2026 would require adopting `subscriptions/listen` (which does not carry task events) or declaring the era poll-only. +- **Stateful proxy affinity (degraded).** The stateful proxy's `_caches` are keyed by the per-request `Connection`, so on modern connections the proxy collapses to stateless proxying: results stay correct, but the per-session affinity guarantee is lost. This is decided alongside the `session_id` question — same root — or gated to the legacy/stdio transports. + +Multi-replica concerns (per-process rate-limiter buckets, shared Redis backends for state and tasks, a Redis `SubscriptionBus`) are deployment configuration rather than protocol gaps and are out of scope for this section. + +## Upstream advisory dossier + +FastMCP acts as an advisor to the SDK team. The migration produced a dossier of ten findings (`sdk-feedback.md`) — verified bugs and hard edges to report upstream, plus questions to bundle into a feedback thread. The highest-priority items: + +- **#1 (bug)** — SEP-1686 task result types ship but the method registries omit them. +- **#2 (bug/question)** — `capabilities.extensions` stripped at pre-2026 negotiated versions. +- **#4 (security)** — DCR redirect-URI validation accepts `javascript:`/`data:` schemes. +- **#5 (hard edge)** — `streamable_http_client` drops session-id access with no replacement. +- **#8 (hard edge)** — custom server notifications are dropped, not tee'd to `message_handler`. +- **#10 (hard edge)** — 2026 push-feature degradation error quality is inconsistent. + +Filing is gated on maintainer approval of each issue text. + +Separately, the [SDK delegation round two](/development/v4-notes/feature-program#sdk-delegation-round-two) work depends on **three upstream feature requests** — per-session event-store scoping, a user-middleware injection hook, and a lifespan hook — that would let FastMCP collapse its HTTP builders onto the SDK's and inherit the SDK's session-owner credential enforcement. + +## GA transition checklist + +The beta-to-stable transition is a small set of tracked steps: + +- **Swap the pins.** When `mcp 2.0.0` reaches GA, change `mcp-types==2.0.0b1` (core) and the `mcp` pin (the `[mcp]` extra) in `fastmcp_slim/pyproject.toml` from the beta to the stable release, and cut `4.0.0` instead of another pre-release. +- **Re-run the xfail suite against the GA SDK.** Any strict xfail that starts passing means a gap closed — remove the marker and, where applicable, the corresponding shim. +- **Confirm `release/3.x`** is cut from pre-merge `main` and receiving upstream security patches for users who stay on the SDK v1 line. diff --git a/docs/docs.json b/docs/docs.json index 86452fe59..ad88f7376 100644 --- a/docs/docs.json +++ b/docs/docs.json @@ -350,6 +350,7 @@ "icon": "up", "pages": [ "getting-started/upgrading/from-fastmcp-2", + "getting-started/upgrading/from-fastmcp-3", "getting-started/upgrading/from-mcp-sdk", "getting-started/upgrading/from-low-level-sdk" ] @@ -362,7 +363,17 @@ "development/contributing", "development/tests", "development/releases", - "patterns/contrib" + "patterns/contrib", + { + "collapsed": true, + "group": "v4 Notes", + "pages": [ + "development/v4-notes/index", + "development/v4-notes/change-register", + "development/v4-notes/feature-program", + "development/v4-notes/known-gaps" + ] + } ] }, { @@ -478,6 +489,10 @@ { "destination": "/getting-started/upgrading/from-low-level-sdk", "source": "/getting-started/low-level-sdk" + }, + { + "destination": "/getting-started/upgrading/from-fastmcp-3", + "source": "/getting-started/upgrading/to-mcp-sdk-v2" } ], "search": { diff --git a/docs/getting-started/upgrading/from-fastmcp-2.mdx b/docs/getting-started/upgrading/from-fastmcp-2.mdx index 1e659e76a..dc6a0fced 100644 --- a/docs/getting-started/upgrading/from-fastmcp-2.mdx +++ b/docs/getting-started/upgrading/from-fastmcp-2.mdx @@ -171,7 +171,7 @@ Prompt functions now use FastMCP's `Message` class instead of `mcp.types.PromptM ```python # Before -from mcp.types import PromptMessage, TextContent +from fastmcp.types import PromptMessage, TextContent @mcp.prompt def my_prompt() -> PromptMessage: diff --git a/docs/getting-started/upgrading/from-fastmcp-3.mdx b/docs/getting-started/upgrading/from-fastmcp-3.mdx new file mode 100644 index 000000000..25c1617dd --- /dev/null +++ b/docs/getting-started/upgrading/from-fastmcp-3.mdx @@ -0,0 +1,146 @@ +--- +title: Upgrading from FastMCP 3 +sidebarTitle: "From FastMCP 3.x" +description: What changes when you upgrade to FastMCP 4, which builds on the MCP Python SDK v2 +icon: up +--- + +FastMCP 4 builds on the MCP Python SDK v2, and that is the source of every change in this guide. The SDK v2 makes two sweeping changes to the protocol layer: it splits the protocol types out of `mcp.types` into a standalone `mcp_types` package, and it renames every protocol field from camelCase to snake_case (`inputSchema` → `input_schema`, `mimeType` → `mime_type`, `isError` → `is_error`, and so on). + +FastMCP 4 absorbs almost all of this for you. Field access is bridged so your existing reads keep working, and the imports you were taught have a stable home in FastMCP itself. The sections below describe what FastMCP handles for you, the small number of changes you must make in your own code, and the deprecation timeline for the compatibility shims. + +## Environment requirements + +The SDK v2 raises FastMCP's dependency floors, which matters before any of your code runs. + +**pydantic >= 2.12 is now the floor.** If your project pins an older pydantic (for example `pydantic==2.11.*`), installing this FastMCP release fails with an unsatisfiable-resolution error from your installer — bump your pin to `>=2.12` first. If you don't pin pydantic at all, installers upgrade it silently as part of the FastMCP upgrade. + +**The server extra floors Starlette >= 1.0.** Modern FastAPI (0.11x and later) already runs on Starlette 1.x, so mounting a FastMCP server inside a FastAPI app coexists cleanly — verified with FastAPI 0.138.2. Only very old FastAPI versions pinned below Starlette 1.0 conflict; upgrade FastAPI if your resolver complains about Starlette. + +## What FastMCP absorbs + +### Legacy camelCase field access keeps working + +Objects that FastMCP hands back to you — the results of `client.list_tools()`, `client.call_tool_mcp()`, `client.read_resource()`, and the parameter objects passed to your sampling and elicitation handlers — are SDK v2 objects with snake_case fields. FastMCP installs a compatibility bridge at import time that routes the old camelCase names to their new snake_case fields, so code written against FastMCP 2.x still reads correctly: + +```python +from fastmcp import Client + +async with Client("my_mcp_server.py") as client: + tools = await client.list_tools() + schema = tools[0].inputSchema # still works, warns once +``` + +Each bridged read emits a `FastMCPDeprecationWarning` pointing you at the snake_case name (`tools[0].input_schema` here). The bridge covers the fields users actually read: `inputSchema`/`outputSchema` on tools, `mimeType` on resources and content, `isError`/`structuredContent` on tool results, `nextCursor` on paginated results, `serverInfo`/`protocolVersion` on the initialize result, the sampling parameter fields (`systemPrompt`, `maxTokens`, `stopSequences`, `modelPreferences`, `toolChoice`), and `requestedSchema` on elicitation parameters. + +The bridge is controlled by the `mcp_camelcase_compat` setting, which defaults to on. Set it to `False` (or the environment variable `FASTMCP_MCP_CAMELCASE_COMPAT=false`) to turn the shims off, in which case only the snake_case names resolve: + +```python +import fastmcp + +fastmcp.settings.mcp_camelcase_compat = False +``` + +See [Settings](/more/settings) for the full reference. + +### Imports have a stable home + +The `mcp.types` module no longer exists. FastMCP re-exports the protocol types you're most likely to use — `TextContent`, `ImageContent`, `Tool`, `ErrorData`, `Icon`, `PromptMessage`, `SamplingMessage`, `ToolAnnotations`, and around two dozen others — from `fastmcp.types`. Update your imports to point there: + +```python +from fastmcp.types import TextContent, Tool, ToolAnnotations +``` + +For protocol types FastMCP does not re-export (notification and request wrapper types like `ToolListChangedNotification` or `ServerNotification`), import them from `mcp_types` directly: + +```python +import mcp_types + +notification = mcp_types.ToolListChangedNotification() +``` + +### `McpError` has an alias + +`fastmcp.exceptions.McpError` is an alias of the SDK's `MCPError`. Catching errors is unchanged — `except McpError` still catches SDK-raised errors, and reading `err.error.code` still works: + +```python +from fastmcp.exceptions import McpError + +try: + ... +except McpError as err: + print(err.error.code) +``` + +### Behavior preserved across the SDK boundary + +A few client behaviors that touch the SDK are preserved so you don't have to change anything: + +- `Client(timeout=...)` accepts both a `timedelta` and a plain float number of seconds, as before. +- `client.ping()` returns a `bool`. +- `client.transport.get_session_id()` returns `None` on protocol eras that have no session, rather than raising. (The SDK v2 removed session-id access from its streamable HTTP transport; FastMCP reconstructs it on the transport object.) + +## What you must change + +Three things are on you. + +**Your own `mcp.types` imports.** FastMCP can re-export types, but it can't rewrite imports in your code. Any `from mcp.types import X` or `import mcp.types` in your server or client fails at import time with: + +``` +ModuleNotFoundError: No module named 'mcp.types' +``` + +The raw message gives no hint toward the fix, so if you see it after upgrading, this is why. Switch to `from fastmcp.types import X` for the common types, or `import mcp_types` for the rest. + +**`McpError` construction.** The v1 pattern of wrapping an `ErrorData` and passing it positionally fails under SDK v2 with: + +``` +TypeError: MCPError.__init__() missing 1 required positional argument: 'message' +``` + +Note the message prints the class as `MCPError` (uppercase) even though your code wrote `McpError` — the old name is an alias for the SDK's renamed class. Construct the error with keyword arguments instead: + +```python +from fastmcp.exceptions import McpError + +# Before (raises TypeError under SDK v2): +# raise McpError(ErrorData(code=-32000, message="Client not supported")) + +# After: +raise McpError(code=-32000, message="Client not supported") +``` + +Catching and `err.error.code` are unchanged — only construction moved. + +**Raw session access sees v2 objects.** If you reach past FastMCP's client and server surfaces into `client.session`, `ctx.session`, or the internals of `ctx.request_context`, you're now holding raw SDK v2 objects with snake_case fields and the v2 method signatures. FastMCP does not wrap these; code that depends on their v1 shape needs updating. + +## Deprecation timeline + +The camelCase bridge is a migration aid, not a permanent fixture. It works today and warns on every bridged read so you can find and update the affected call sites. Plan to migrate your reads to snake_case: the shims will be removed in a future release, after which only the snake_case names resolve — the same state you get today by setting `mcp_camelcase_compat = False`. Turning the setting off is a good way to surface every remaining camelCase read in your code as a hard `AttributeError` before the shims go away. + +## SDK deprecation warnings you may see + +Ordinary use of `ctx.info` (client logging) and `ctx.sample` now emits an SDK-level `MCPDeprecationWarning`: + +``` +The logging/sampling capability is deprecated as of 2026-07-28 (SEP-2577) +``` + +These warnings come from the MCP SDK, not from FastMCP, and they are benign: the features keep working on session-based (handshake-era) connections exactly as the protocol table below describes. The SDK is signaling that the `2026-07-28` protocol era removed these capabilities from the wire — the warning is about the protocol's direction, not about your code being broken today. + +## Protocol version support + +FastMCP servers built on the SDK v2 serve multiple protocol eras from the same server. The SDK negotiates the era each client speaks: the sessionless `2026-07-28` era (which discovers capabilities through `server/discover`) and earlier session-based handshake versions are all handled simultaneously. This formally supersedes FastMCP's earlier "latest protocol only" stance — a single server now works with clients across the protocol transition. + +Not every Context feature is available on every era yet. The push-style interactions that require the server to call back into the client — elicitation, sampling, and listing roots — depend on the session-based request/response flow of the earlier eras. On a `2026-07-28` connection these raise, because the sessionless era needs a multi-round-trip replacement that is still being built. Logging notifications and the request/response features flow on every era. + +| Context feature | Earlier eras (session-based) | `2026-07-28` (sessionless) | +| --- | --- | --- | +| `ctx.info` / logging notifications | Supported | Supported | +| Tools, resources, prompts, completions | Supported | Supported | +| `ctx.elicit` | Supported | Not yet — MRTR rewrite pending | +| `ctx.sample` | Supported | Not yet — MRTR rewrite pending | +| `ctx.list_roots` | Supported | Not yet — MRTR rewrite pending | +| Tasks (via the FastMCP client) | Supported | Not yet | + +If your tools rely on `ctx.elicit`, `ctx.sample`, or `ctx.list_roots`, they continue to work against clients on the earlier eras. As the sessionless replacements land, this table will expand. diff --git a/docs/getting-started/upgrading/from-low-level-sdk.mdx b/docs/getting-started/upgrading/from-low-level-sdk.mdx index ce4ddea75..ab49f1574 100644 --- a/docs/getting-started/upgrading/from-low-level-sdk.mdx +++ b/docs/getting-started/upgrading/from-low-level-sdk.mdx @@ -9,16 +9,18 @@ If you've been building MCP servers directly on the `mcp` package's `Server` cla The core idea: instead of telling the SDK what your tools look like and then separately implementing them, you write ordinary Python functions and let FastMCP derive the protocol layer from your code. Type hints become JSON Schema. Docstrings become descriptions. Return values are serialized automatically. The plumbing you wrote to satisfy the protocol just disappears. -<Note> -This guide covers upgrading from **v1** of the `mcp` package. We'll provide a separate guide when v2 ships. -</Note> +## Why now is the moment to switch + +MCP SDK v2 landed sweeping breaking changes on the low-level `Server`: the protocol types moved out of `mcp.types` into a separate `mcp_types` package, every field was renamed from camelCase to snake_case, the `Server` class was rebuilt, `McpError` was renamed, and sessions were removed on the new sessionless protocol era. If you build directly on the low-level SDK, all of that lands on you — you have to rewrite your imports, your handler signatures, and your error construction to match the new surface. + +Adopting FastMCP is the easier path. FastMCP 4 runs on SDK v2 and hides that entire surface behind a high-level API that did not change. You write `@mcp.tool` and never touch the renamed internals — FastMCP derives the protocol layer from your function signatures, so the SDK v2 rename simply isn't something your code has to know about. Migrating low-level-SDK-v1 code to FastMCP is less work than migrating it to raw SDK v2, and you come out the other side with the whole framework: composition, middleware, proxies, authentication, and testing. The SDK v2 break is the natural moment to make the jump. <Note> Already using FastMCP 1.0 via `from mcp.server.fastmcp import FastMCP`? Your upgrade is simpler — see the [FastMCP 1.0 upgrade guide](/getting-started/upgrading/from-mcp-sdk) instead. </Note> <Prompt description="Copy this prompt into any LLM along with your server code to get automated upgrade guidance."> -You are upgrading an MCP server from the `mcp` package's low-level Server class (v1) to FastMCP 3.0. The server currently uses `mcp.server.Server` (or `mcp.server.lowlevel.server.Server`) with manual handler registration. Analyze the provided code and rewrite it using FastMCP's high-level API. The full guide is at https://gofastmcp.com/getting-started/upgrading/from-low-level-sdk and the complete FastMCP documentation is at https://gofastmcp.com — fetch these for complete context. +You are upgrading an MCP server from the `mcp` package's low-level Server class (v1) to FastMCP 4. The server currently uses `mcp.server.Server` (or `mcp.server.lowlevel.server.Server`) with manual handler registration. Analyze the provided code and rewrite it using FastMCP's high-level API. The full guide is at https://gofastmcp.com/getting-started/upgrading/from-low-level-sdk and the complete FastMCP documentation is at https://gofastmcp.com — fetch these for complete context. UPGRADE RULES: diff --git a/docs/getting-started/upgrading/from-mcp-sdk.mdx b/docs/getting-started/upgrading/from-mcp-sdk.mdx index 494d06bdc..919df361a 100644 --- a/docs/getting-started/upgrading/from-mcp-sdk.mdx +++ b/docs/getting-started/upgrading/from-mcp-sdk.mdx @@ -32,7 +32,7 @@ uv add fastmcp FastMCP includes the `mcp` package as a dependency, so you don't lose access to anything. Update your import, run your server, and if your tools work, you're done. <Prompt description="Copy this prompt into any LLM along with your server code to get automated upgrade guidance."> -You are upgrading an MCP server from FastMCP 1.0 (bundled in the `mcp` package v1) to standalone FastMCP 3.0. Analyze the provided code and identify every change needed. The full upgrade guide is at https://gofastmcp.com/getting-started/upgrading/from-mcp-sdk and the complete FastMCP documentation is at https://gofastmcp.com — fetch these for complete context. +You are upgrading an MCP server from FastMCP 1.0 (bundled in the `mcp` package v1) to standalone FastMCP 4. Analyze the provided code and identify every change needed. The full upgrade guide is at https://gofastmcp.com/getting-started/upgrading/from-mcp-sdk and the complete FastMCP documentation is at https://gofastmcp.com — fetch these for complete context. STEP 1 — IMPORT (required for all servers): Change "from mcp.server.fastmcp import FastMCP" to "from fastmcp import FastMCP". @@ -51,9 +51,9 @@ Also: if prompts return raw dicts like `{"role": "user", "content": "..."}`, the The MCP SDK's FastMCP 1.0 silently coerced dicts; standalone FastMCP requires typed returns. STEP 4 — OTHER MCP IMPORTS (only if importing from mcp.* directly): -Direct imports from the `mcp` package (e.g., `import mcp.types`, `from mcp.server.stdio import stdio_server`) still work because FastMCP includes `mcp` as a dependency. However, prefer FastMCP's own APIs where equivalents exist: -- mcp.types.TextContent for tool returns → just return plain Python values (str, int, dict, etc.) -- mcp.types.ImageContent → fastmcp.utilities.types.Image +FastMCP now builds on MCP SDK v2, which removed the `mcp.types` module — protocol types live in the standalone `mcp_types` package. FastMCP re-exports the common ones from `fastmcp.types`. Update any `from mcp.types import X` to `from fastmcp.types import X` (or `import mcp_types`). Prefer FastMCP's own APIs where equivalents exist: +- fastmcp.types.TextContent for tool returns → just return plain Python values (str, int, dict, etc.) +- fastmcp.types.ImageContent → fastmcp.utilities.types.Image - from mcp.server.stdio import stdio_server → not needed, mcp.run() handles transport STEP 5 — DECORATORS (only if treating decorated functions as objects): @@ -113,7 +113,7 @@ def debug(error: str) -> list[Message]: ### Other `mcp.*` Imports -If your server imports directly from the `mcp` package — like `import mcp.types` or `from mcp.server.stdio import stdio_server` — those still work. FastMCP includes `mcp` as a dependency, so nothing breaks. +FastMCP now builds on MCP SDK v2. The `mcp.types` module no longer exists — protocol types moved to a standalone `mcp_types` package, and the field names were renamed from camelCase to snake_case (`inputSchema` → `input_schema`, `mimeType` → `mime_type`, and so on). FastMCP re-exports the types you're most likely to use from `fastmcp.types`, so update `from mcp.types import X` to `from fastmcp.types import X`. For the full picture, see [Upgrading from FastMCP 3](/getting-started/upgrading/from-fastmcp-3). Where FastMCP provides its own API for the same thing, it's worth switching over: @@ -124,7 +124,7 @@ Where FastMCP provides its own API for the same thing, it's worth switching over | `mcp.types.PromptMessage(...)` | `from fastmcp.prompts import Message` | | `from mcp.server.stdio import stdio_server` | Not needed — `mcp.run()` handles transport | -For anything without a FastMCP equivalent (e.g., specific protocol types you use directly), the `mcp.*` import is fine to keep. +For protocol types without a FastMCP equivalent, import them from `fastmcp.types` when re-exported there, otherwise from `mcp_types` directly. ### Decorated Functions diff --git a/docs/integrations/chatgpt.mdx b/docs/integrations/chatgpt.mdx index 23249f92c..e1fb663e2 100644 --- a/docs/integrations/chatgpt.mdx +++ b/docs/integrations/chatgpt.mdx @@ -95,7 +95,7 @@ The connector must be explicitly enabled in each chat session through Developer Use `annotations=ToolAnnotations(readOnlyHint=True)` to skip confirmation prompts for read-only tools: ```python -from mcp.types import ToolAnnotations +from fastmcp.types import ToolAnnotations @mcp.tool(annotations=ToolAnnotations(readOnlyHint=True)) def get_status() -> str: diff --git a/docs/integrations/scalekit.mdx b/docs/integrations/scalekit.mdx index 191b81ca2..2b2fa9d10 100644 --- a/docs/integrations/scalekit.mdx +++ b/docs/integrations/scalekit.mdx @@ -134,22 +134,15 @@ logging.basicConfig(level=logging.DEBUG) You can inspect JWT tokens in your tools to understand the user context: ```python -from fastmcp.server.context import request_ctx -import jwt +from fastmcp.server.dependencies import get_access_token @mcp.tool def inspect_token() -> dict: """Inspect the current JWT token claims.""" - context = request_ctx.get() + token = get_access_token() + if token is None: + return {"error": "No token found"} - # Extract token from Authorization header - if hasattr(context, 'request') and hasattr(context.request, 'headers'): - auth_header = context.request.headers.get('authorization', '') - if auth_header.startswith('Bearer '): - token = auth_header[7:] - # Decode without verification (already verified by provider) - claims = jwt.decode(token, options={"verify_signature": False}) - return claims - - return {"error": "No token found"} + # Claims were already verified by the auth provider. + return token.claims ``` diff --git a/docs/more/settings.mdx b/docs/more/settings.mdx index 61acd82c3..cd3ba02cf 100644 --- a/docs/more/settings.mdx +++ b/docs/more/settings.mdx @@ -27,6 +27,7 @@ You can change which `.env` file is loaded by setting the `FASTMCP_ENV_FILE` env | `FASTMCP_ENABLE_RICH_LOGGING` | `bool` | `true` | Use rich formatting for log output. Set to `false` for plain Python logging. | | `FASTMCP_ENABLE_RICH_TRACEBACKS` | `bool` | `true` | Use rich tracebacks for errors. | | `FASTMCP_DEPRECATION_WARNINGS` | `bool` | `true` | Show deprecation warnings. | +| `FASTMCP_MCP_CAMELCASE_COMPAT` | `bool` | `true` | Bridge legacy camelCase reads on MCP SDK objects (e.g. `tool.inputSchema`, `result.isError`) to their snake_case fields after the SDK v2 rename. Each bridged read emits a `FastMCPDeprecationWarning`. Set to `false` to disable the shims, in which case only the snake_case names resolve. | ## Transport & HTTP diff --git a/docs/servers/context.mdx b/docs/servers/context.mdx index d442743ab..ecd9e67ea 100644 --- a/docs/servers/context.mdx +++ b/docs/servers/context.mdx @@ -331,14 +331,14 @@ Tools can customize which components are visible to their current session using FastMCP automatically sends list change notifications when components (such as tools, resources, or prompts) are added, removed, enabled, or disabled. In rare cases where you need to manually trigger these notifications, you can use the context's notification methods: ```python -import mcp.types +import mcp_types @mcp.tool async def custom_tool_management(ctx: Context) -> str: """Example of manual notification after custom tool changes.""" - await ctx.send_notification(mcp.types.ToolListChangedNotification()) - await ctx.send_notification(mcp.types.ResourceListChangedNotification()) - await ctx.send_notification(mcp.types.PromptListChangedNotification()) + await ctx.send_notification(mcp_types.ToolListChangedNotification()) + await ctx.send_notification(mcp_types.ResourceListChangedNotification()) + await ctx.send_notification(mcp_types.PromptListChangedNotification()) return "Notifications sent" ``` diff --git a/docs/servers/icons.mdx b/docs/servers/icons.mdx index c9b558094..589e054f2 100644 --- a/docs/servers/icons.mdx +++ b/docs/servers/icons.mdx @@ -15,11 +15,11 @@ Icons provide visual representations for your MCP servers and components, helpin Icons use the standard MCP Icon type from the MCP protocol specification. Each icon specifies a source URL or data URI, and optionally includes MIME type and size information. ```python -from mcp.types import Icon +from fastmcp.types import Icon icon = Icon( src="https://example.com/icon.png", - mimeType="image/png", + mime_type="image/png", sizes=["48x48"] ) ``` @@ -27,7 +27,7 @@ icon = Icon( The fields serve different purposes: - **src**: URL or data URI pointing to the icon image -- **mimeType** (optional): MIME type of the image (e.g., "image/png", "image/svg+xml") +- **mime_type** (optional): MIME type of the image (e.g., "image/png", "image/svg+xml") - **sizes** (optional): Array of size descriptors (e.g., ["48x48"], ["any"]) ## Server Icons @@ -36,7 +36,7 @@ Add icons and a website URL to your server for display in client applications. M ```python from fastmcp import FastMCP -from mcp.types import Icon +from fastmcp.types import Icon mcp = FastMCP( name="WeatherService", @@ -44,12 +44,12 @@ mcp = FastMCP( icons=[ Icon( src="https://weather.example.com/icon-48.png", - mimeType="image/png", + mime_type="image/png", sizes=["48x48"] ), Icon( src="https://weather.example.com/icon-96.png", - mimeType="image/png", + mime_type="image/png", sizes=["96x96"] ), ] @@ -65,7 +65,7 @@ Icons can be added to individual tools, resources, resource templates, and promp ### Tool Icons ```python -from mcp.types import Icon +from fastmcp.types import Icon @mcp.tool( icons=[Icon(src="https://example.com/calculator-icon.png")] @@ -115,13 +115,13 @@ def analyze_code(code: str): For small icons or when you want to embed the icon directly without external dependencies, use data URIs. This approach eliminates the need for hosting and ensures the icon is always available. ```python -from mcp.types import Icon +from fastmcp.types import Icon from fastmcp.utilities.types import Image # SVG icon as data URI svg_icon = Icon( src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCI+PHBhdGggZD0iTTEyIDJDNi40OCAyIDIgNi40OCAyIDEyczQuNDggMTAgMTAgMTAgMTAtNC40OCAxMC0xMFMxNy41MiAyIDEyIDJ6Ii8+PC9zdmc+", - mimeType="image/svg+xml" + mime_type="image/svg+xml" ) @mcp.tool(icons=[svg_icon]) @@ -135,7 +135,7 @@ def my_tool() -> str: FastMCP provides the `Image` utility class to convert local image files into data URIs. ```python -from mcp.types import Icon +from fastmcp.types import Icon from fastmcp.utilities.types import Image # Generate a data URI from a local image file diff --git a/docs/servers/middleware.mdx b/docs/servers/middleware.mdx index b974bb0f5..c08c06b25 100644 --- a/docs/servers/middleware.mdx +++ b/docs/servers/middleware.mdx @@ -265,8 +265,7 @@ async def on_list_prompts(self, context: MiddlewareContext, call_next): Called when a client connects and initializes the session. This hook cannot modify the initialization response. ```python -from mcp import McpError -from mcp.types import ErrorData +from fastmcp.exceptions import McpError async def on_initialize(self, context: MiddlewareContext, call_next): client_info = context.message.params.get("clientInfo", {}) @@ -274,7 +273,7 @@ async def on_initialize(self, context: MiddlewareContext, call_next): # Reject before call_next to send error to client if client_name == "blocked-client": - raise McpError(ErrorData(code=-32000, message="Client not supported")) + raise McpError(code=-32000, message="Client not supported") await call_next(context) print(f"Client {client_name} initialized") diff --git a/docs/servers/pagination.mdx b/docs/servers/pagination.mdx index 97ad2c7a2..c23e296bc 100644 --- a/docs/servers/pagination.mdx +++ b/docs/servers/pagination.mdx @@ -34,7 +34,7 @@ def analyze(data: str) -> dict: # ... many more tools, resources, prompts ``` -When `list_page_size` is configured, the `tools/list`, `resources/list`, `resources/templates/list`, and `prompts/list` endpoints all paginate their responses. Each response includes a `nextCursor` field when more results exist, which clients use to fetch subsequent pages. +When `list_page_size` is configured, the `tools/list`, `resources/list`, `resources/templates/list`, and `prompts/list` endpoints all paginate their responses. Each response includes a `next_cursor` field when more results exist, which clients use to fetch subsequent pages. ### Cursor Format @@ -66,12 +66,12 @@ async with Client(server) as client: print(f"Page 1: {len(result.tools)} tools") # Continue fetching while more pages exist - while result.nextCursor: - result = await client.list_tools_mcp(cursor=result.nextCursor) + while result.next_cursor: + result = await client.list_tools_mcp(cursor=result.next_cursor) print(f"Next page: {len(result.tools)} tools") ``` -The `_mcp` methods return the raw MCP protocol objects, which include both the items and the `nextCursor` for the next page. When `nextCursor` is `None`, you've reached the end of the result set. +The `_mcp` methods return the raw MCP protocol objects, which include both the items and the `next_cursor` for the next page. When `next_cursor` is `None`, you've reached the end of the result set. All four list operations support manual pagination: diff --git a/docs/servers/sampling.mdx b/docs/servers/sampling.mdx index 8ea479eb0..4043e2ad7 100644 --- a/docs/servers/sampling.mdx +++ b/docs/servers/sampling.mdx @@ -84,7 +84,7 @@ Use model preferences when different tasks benefit from different model characte For requests that need conversational context, construct a list of `SamplingMessage` objects representing the conversation history. Each message has a `role` ("user" or "assistant") and `content` (a `TextContent` object). ```python -from mcp.types import SamplingMessage, TextContent +from fastmcp.types import SamplingMessage, TextContent from fastmcp import FastMCP, Context mcp = FastMCP() @@ -354,7 +354,7 @@ Use `sample_step()` when you need to: By default, `sample_step()` executes any tool calls and includes the results in the history. Call it in a loop, passing the updated history each time, until a stop condition is met. ```python -from mcp.types import SamplingMessage +from fastmcp.types import SamplingMessage from fastmcp import FastMCP, Context mcp = FastMCP() @@ -407,7 +407,7 @@ The contents of `step.history` depend on `execute_tools`: Set `execute_tools=False` to handle tool execution yourself. When disabled, `step.history` contains the user message and the assistant's response with tool calls—but no tool results. You execute the tools and append the results as a user message. ```python -from mcp.types import SamplingMessage, ToolResultContent, TextContent +from fastmcp.types import SamplingMessage, ToolResultContent, TextContent from fastmcp import FastMCP, Context mcp = FastMCP() @@ -443,7 +443,7 @@ async def research(question: str, ctx: Context) -> str: tool_results.append( ToolResultContent( type="tool_result", - toolUseId=call.id, + tool_use_id=call.id, content=[TextContent(type="text", text=result)], ) ) @@ -452,14 +452,14 @@ async def research(question: str, ctx: Context) -> str: messages.append(SamplingMessage(role="user", content=tool_results)) ``` -To report an error to the LLM, set `isError=True` on the tool result: +To report an error to the LLM, set `is_error=True` on the tool result: ```python tool_result = ToolResultContent( type="tool_result", - toolUseId=call.id, + tool_use_id=call.id, content=[TextContent(type="text", text="Permission denied")], - isError=True, + is_error=True, ) ``` diff --git a/docs/servers/tools.mdx b/docs/servers/tools.mdx index 862066bc7..bc5b7d228 100644 --- a/docs/servers/tools.mdx +++ b/docs/servers/tools.mdx @@ -723,7 +723,7 @@ For complete control over tool responses, return a `ToolResult` object. This giv ```python from fastmcp.tools.tool import ToolResult -from mcp.types import TextContent +from fastmcp.types import TextContent @mcp.tool def advanced_tool() -> ToolResult: @@ -746,7 +746,7 @@ ToolResult(content="Hello, world!") # List of content blocks ToolResult(content=[ TextContent(type="text", text="Result: 42"), - ImageContent(type="image", data="base64...", mimeType="image/png") + ImageContent(type="image", data="base64...", mime_type="image/png") ]) ``` @@ -944,7 +944,7 @@ Annotations serve several purposes in client applications: You can add annotations to a tool using the `annotations` parameter in the `@mcp.tool` decorator. FastMCP accepts either a plain dict or `ToolAnnotations`; the examples below use `ToolAnnotations` for consistency and stronger editor/type support. ```python -from mcp.types import ToolAnnotations +from fastmcp.types import ToolAnnotations @mcp.tool( annotations=ToolAnnotations( @@ -983,7 +983,7 @@ Mark a tool as read-only when it retrieves data, performs calculations, or check ```python from fastmcp import FastMCP -from mcp.types import ToolAnnotations +from fastmcp.types import ToolAnnotations mcp = FastMCP("Data Server") diff --git a/docs/v2/integrations/scalekit.mdx b/docs/v2/integrations/scalekit.mdx index abe41a2ba..5a877330f 100644 --- a/docs/v2/integrations/scalekit.mdx +++ b/docs/v2/integrations/scalekit.mdx @@ -173,22 +173,15 @@ logging.basicConfig(level=logging.DEBUG) You can inspect JWT tokens in your tools to understand the user context: ```python -from fastmcp.server.context import request_ctx -import jwt +from fastmcp.server.dependencies import get_access_token @mcp.tool def inspect_token() -> dict: """Inspect the current JWT token claims.""" - context = request_ctx.get() + token = get_access_token() + if token is None: + return {"error": "No token found"} - # Extract token from Authorization header - if hasattr(context, 'request') and hasattr(context.request, 'headers'): - auth_header = context.request.headers.get('authorization', '') - if auth_header.startswith('Bearer '): - token = auth_header[7:] - # Decode without verification (already verified by provider) - claims = jwt.decode(token, options={"verify_signature": False}) - return claims - - return {"error": "No token found"} + # Claims were already verified by the auth provider. + return token.claims ``` diff --git a/fastmcp_slim/fastmcp/__init__.py b/fastmcp_slim/fastmcp/__init__.py index ab9f9358d..0e1c33bf0 100644 --- a/fastmcp_slim/fastmcp/__init__.py +++ b/fastmcp_slim/fastmcp/__init__.py @@ -5,10 +5,14 @@ import warnings from importlib.metadata import PackageNotFoundError, version as _version from typing import TYPE_CHECKING -from fastmcp import _install_hints +from fastmcp import _install_hints, _sdk_patches from fastmcp.settings import Settings from fastmcp.utilities.logging import configure_logging as _configure_logging +# Apply temporary SDK registry patches (SEP-1686 task methods) before any +# client/server use. See fastmcp._sdk_patches for the upstream-gap rationale. +_sdk_patches.install() + if TYPE_CHECKING: from fastmcp.client import Client as Client from fastmcp.apps.app import FastMCPApp as FastMCPApp @@ -25,6 +29,14 @@ if settings.log_enabled: enable_rich_tracebacks=settings.enable_rich_tracebacks, ) +# Install camelCase compatibility shims for MCP SDK v2's snake_case rename. +# Installed unconditionally; each shim's getter checks the live +# `mcp_camelcase_compat` setting at read time, so the bridge can be toggled at +# runtime. Patches only mcp_types model classes, no client chain. +from fastmcp import _compat + +_compat.install() + try: __version__ = _version("fastmcp-slim") except PackageNotFoundError: diff --git a/fastmcp_slim/fastmcp/_compat.py b/fastmcp_slim/fastmcp/_compat.py new file mode 100644 index 000000000..f5fcc7f81 --- /dev/null +++ b/fastmcp_slim/fastmcp/_compat.py @@ -0,0 +1,152 @@ +"""camelCase compatibility bridge for MCP SDK v2. + +MCP Python SDK v2 renamed protocol fields from camelCase (`inputSchema`) to +snake_case (`input_schema`). FastMCP returns these SDK models directly from +client calls, middleware hooks, and handler callbacks, so legacy user code that +reads the old camelCase spellings would break. + +This module installs warn-once `@property` shims that route a small set of +documented camelCase reads to their snake_case attributes. Only fields users +actually read (per the docs boundary inventory) are bridged; each read emits a +single `FastMCPDeprecationWarning` per (class, name) and returns the correct +value. Installation is idempotent. + +The properties are installed unconditionally, but each getter checks the live +`mcp_camelcase_compat` setting at read time: when the setting is enabled it +warns and returns the snake_case value; when disabled it raises `AttributeError` +exactly as if the property were never installed. This makes the setting a +genuine runtime toggle (`fastmcp.settings.mcp_camelcase_compat = False` after +import turns the bridge off) at negligible overhead. + +Guards ensure we never shadow a real upstream attribute: if a class already +defines the camelCase name in its own `__dict__` or in its pydantic +`model_fields`, we skip it. The property is a plain descriptor read, so values +survive `model_copy`/`model_validate` (the underlying snake field is what gets +copied/validated; the property reads through it every time). + +# TODO(sdk-v2-migration): remove once user code has migrated off camelCase reads. +""" + +from __future__ import annotations + +import warnings + +import mcp_types + +from fastmcp.exceptions import FastMCPDeprecationWarning + +# Map each SDK model class to the camelCase -> snake_case field reads we bridge. +# Limited to fields FastMCP users actually read (docs boundary inventory). +_ALIASES: dict[type, dict[str, str]] = { + mcp_types.Tool: { + "inputSchema": "input_schema", + "outputSchema": "output_schema", + }, + mcp_types.Resource: { + "mimeType": "mime_type", + }, + mcp_types.ResourceTemplate: { + "mimeType": "mime_type", + "uriTemplate": "uri_template", + }, + mcp_types.TextResourceContents: { + "mimeType": "mime_type", + }, + mcp_types.BlobResourceContents: { + "mimeType": "mime_type", + }, + mcp_types.ImageContent: { + "mimeType": "mime_type", + }, + mcp_types.AudioContent: { + "mimeType": "mime_type", + }, + mcp_types.CallToolResult: { + "isError": "is_error", + "structuredContent": "structured_content", + }, + mcp_types.Completion: { + "hasMore": "has_more", + }, + mcp_types.InitializeResult: { + "serverInfo": "server_info", + "protocolVersion": "protocol_version", + }, + mcp_types.ListToolsResult: { + "nextCursor": "next_cursor", + }, + mcp_types.ListResourcesResult: { + "nextCursor": "next_cursor", + }, + mcp_types.ListResourceTemplatesResult: { + "nextCursor": "next_cursor", + "resourceTemplates": "resource_templates", + }, + mcp_types.ListPromptsResult: { + "nextCursor": "next_cursor", + }, + mcp_types.CreateMessageRequestParams: { + "systemPrompt": "system_prompt", + "maxTokens": "max_tokens", + "stopSequences": "stop_sequences", + "modelPreferences": "model_preferences", + "toolChoice": "tool_choice", + }, + mcp_types.ElicitRequestFormParams: { + "requestedSchema": "requested_schema", + }, +} + +_installed = False + + +def _make_property(cls_name: str, camel: str, snake: str) -> property: + """Build a warn-once property routing a camelCase read to a snake attr. + + The getter reads the live `mcp_camelcase_compat` setting on every access: if + the bridge is disabled it raises `AttributeError` (matching the message + Python raises for a genuinely missing attribute) so the shim is transparent; + if enabled it warns once and returns the snake_case value. + """ + warned = False + + def getter(self: object) -> object: + nonlocal warned + import fastmcp + + if not fastmcp.settings.mcp_camelcase_compat: + raise AttributeError(f"{cls_name!r} object has no attribute {camel!r}") + if not warned: + warned = True + warnings.warn( + f"Accessing `{cls_name}.{camel}` is deprecated; MCP SDK v2 " + f"renamed this field to `{snake}`. Update your code to read " + f"`.{snake}` instead.", + FastMCPDeprecationWarning, + stacklevel=2, + ) + return getattr(self, snake) + + return property(getter) + + +def install() -> None: + """Install camelCase compatibility properties on SDK v2 model classes. + + Idempotent. Each bridged read warns once per (class, name) and returns the + snake_case value. Skips any camelCase name a class already defines to avoid + shadowing real upstream attributes. + """ + global _installed + if _installed: + return + + for cls, mapping in _ALIASES.items(): + model_fields = getattr(cls, "model_fields", {}) + for camel, snake in mapping.items(): + # Never shadow a real upstream attribute or field. + if camel in cls.__dict__ or camel in model_fields: + continue + setattr(cls, camel, _make_property(cls.__name__, camel, snake)) + + _installed = True diff --git a/fastmcp_slim/fastmcp/_sdk_patches.py b/fastmcp_slim/fastmcp/_sdk_patches.py new file mode 100644 index 000000000..a77765cfc --- /dev/null +++ b/fastmcp_slim/fastmcp/_sdk_patches.py @@ -0,0 +1,131 @@ +"""Temporary in-place patches for gaps in the pinned MCP SDK. + +## SEP-1686 task methods missing from the handshake-era method registries + +This shim compensates for a genuine gap in the SDK's *handshake-era* +(2025-11-25 and earlier) task registry. In the 2025-11-25 SEP-1686 model, tasks +are a first-class part of the core protocol: `CallToolRequestParams` carries a +`task: TaskMetadata` field and a task-augmented `tools/call` returns a +`CreateTaskResult`. `mcp==2.0.0b1` ships those task types (`CreateTaskResult`, +`GetTaskResult`, `GetTaskPayloadResult`, `ListTasksResult`, `CancelTaskResult`) +and the `task` request field, but its `mcp_types.methods` registries were never +wired for them: there are no `tasks/*` rows, and the handshake-era `tools/call` +result rows are a plain `CallToolResult` with no `CreateTaskResult` arm. + +The lowlevel server runner (`mcp.server.runner`) serializes a handler's result +through `serialize_server_result(method, version, ...)` for any method in +`SPEC_CLIENT_METHODS`. `tools/call` is such a method, so when a FastMCP tool is +submitted as a background task (`client.call_tool(..., task=True)`) the handler +returns a `CreateTaskResult`, which fails validation against the un-widened +`tools/call` surface row -> the client sees "Handler returned an invalid +result". The `tasks/*` methods themselves are NOT in `SPEC_CLIENT_METHODS`, so +their handler results already bypass serialization and reach the wire +unvalidated; we still register their result rows here for symmetry and so the +maps are consistent if a future SDK adds them to the spec method set. + +## Scope: handshake-era versions only + +The widening + `tasks/*` registration is gated to +`HANDSHAKE_PROTOCOL_VERSIONS` (2025-11-25 and earlier) because those are the +versions where the 2025 SEP-1686 task model actually applies and where the +SDK's registry has the genuine gap we compensate for. + +The 2026-07-28 protocol is intentionally NOT patched here. Tasks left the core +protocol in 2026-07-28 and became the separate `io.modelcontextprotocol/tasks` +extension; `CreateTaskResult` and the `task` field on `CallToolRequestParams` +do not exist in that schema (a task-augmented `tools/call` was replaced by the +mutually-recursive `CallToolResult | InputRequiredResult` result). Injecting the +2025-era `CreateTaskResult` into the 2026 `tools/call` union would assert the +wrong task model onto that protocol, so we leave its rows untouched. + +This module widens the registries IN PLACE (the maps are `MappingProxyType` +views over private dicts, so we reach the backing dict via `gc.get_referents` +and mutate it, which the already-bound default-argument references in +`mcp_types.methods` observe). `install()` is idempotent. + +# TODO(sdk-upstream): remove when mcp>=2.0.0bX wires SEP-1686 into the +# handshake-era method registries. +""" + +from __future__ import annotations + +import gc +from types import MappingProxyType, UnionType + +import mcp_types +from mcp_types import methods as _methods +from mcp_types.version import HANDSHAKE_PROTOCOL_VERSIONS + +# Result type for each task method, keyed by the client request method name. +_TASK_RESULT_TYPES: dict[str, type] = { + "tasks/get": mcp_types.GetTaskResult, + "tasks/result": mcp_types.GetTaskPayloadResult, + "tasks/list": mcp_types.ListTasksResult, + "tasks/cancel": mcp_types.CancelTaskResult, +} + +_installed = False + + +def _backing_dict(proxy: object) -> dict: + """Return the mutable dict a MappingProxyType wraps. + + The `mcp_types.methods` surface maps are `MappingProxyType` views; their + sole dict referent is the backing store the module's functions read through + their default `surface=` arguments. + """ + referents = [r for r in gc.get_referents(proxy) if isinstance(r, dict)] + if len(referents) != 1: + raise RuntimeError( + "expected exactly one backing dict for the method registry proxy, " + f"found {len(referents)}" + ) + return referents[0] + + +def install() -> None: + """Widen the SDK's server-result registry for SEP-1686 task methods. + + Idempotent. Safe to call at import time before any client/server use. + """ + global _installed + if _installed: + return + + if not isinstance(_methods.SERVER_RESULTS, MappingProxyType): + # Registry shape changed upstream; the shim no longer applies. + _installed = True + return + + server_results = _backing_dict(_methods.SERVER_RESULTS) + + # Gate to handshake-era versions only: the 2025 SEP-1686 task model applies + # there, and 2026-07-28 tasks are the separate io.modelcontextprotocol/tasks + # extension (see module docstring) — its rows must stay untouched. + versions_with_tools_call = { + version + for (method, version) in server_results + if method == "tools/call" and version in HANDSHAKE_PROTOCOL_VERSIONS + } + + for version in versions_with_tools_call: + # (a) widen tools/call so a CreateTaskResult validates (task submission). + existing = server_results[("tools/call", version)] + arms = get_union_arms(existing) + if mcp_types.CreateTaskResult not in arms: + server_results[("tools/call", version)] = ( + existing | mcp_types.CreateTaskResult + ) + + # (b) register the tasks/* result rows for the same versions. + for method, result_type in _TASK_RESULT_TYPES.items(): + server_results.setdefault((method, version), result_type) + + _installed = True + + +def get_union_arms(row: type | UnionType) -> tuple[type, ...]: + """Return the member types of a result row, whether a single type or union.""" + if isinstance(row, UnionType): + return tuple(row.__args__) + return (row,) diff --git a/fastmcp_slim/fastmcp/apps/app.py b/fastmcp_slim/fastmcp/apps/app.py index 5be26b042..33e606118 100644 --- a/fastmcp_slim/fastmcp/apps/app.py +++ b/fastmcp_slim/fastmcp/apps/app.py @@ -32,11 +32,12 @@ from collections.abc import AsyncIterator, Callable, Sequence from contextlib import asynccontextmanager from typing import TYPE_CHECKING, Any, Literal, TypeVar, overload -from mcp.types import AnyFunction, Icon, ToolAnnotations +from mcp_types import Icon, ToolAnnotations from fastmcp.server.providers.base import Provider from fastmcp.utilities.authorization import AuthCheck from fastmcp.utilities.logging import get_logger +from fastmcp.utilities.types import AnyFunction if TYPE_CHECKING: from fastmcp.server.providers.local_provider import LocalProvider diff --git a/fastmcp_slim/fastmcp/cli/apps_dev.py b/fastmcp_slim/fastmcp/cli/apps_dev.py index b4074b14b..803e0f752 100644 --- a/fastmcp_slim/fastmcp/cli/apps_dev.py +++ b/fastmcp_slim/fastmcp/cli/apps_dev.py @@ -1217,11 +1217,11 @@ async def _list_tools(mcp_url: str) -> list[dict[str, Any]]: return [] try: - async with streamable_http_client(mcp_url) as (read, write, _): # noqa: SIM117 + async with streamable_http_client(mcp_url) as (read, write): # noqa: SIM117 async with ClientSession(read, write) as session: await session.initialize() result = await session.list_tools() - return [t.model_dump() for t in result.tools] + return [t.model_dump(by_alias=True) for t in result.tools] except Exception as exc: logger.debug(f"Could not list tools from {mcp_url}: {exc}") return [] @@ -1232,15 +1232,14 @@ async def _read_mcp_resource(mcp_url: str, uri: str) -> str | None: try: from mcp import ClientSession from mcp.client.streamable_http import streamable_http_client - from pydantic import AnyUrl except ImportError: return None try: - async with streamable_http_client(mcp_url) as (read, write, _): # noqa: SIM117 + async with streamable_http_client(mcp_url) as (read, write): # noqa: SIM117 async with ClientSession(read, write) as session: await session.initialize() - result = await session.read_resource(AnyUrl(uri)) + result = await session.read_resource(uri) for content in result.contents: text = getattr(content, "text", None) if text: diff --git a/fastmcp_slim/fastmcp/cli/client.py b/fastmcp_slim/fastmcp/cli/client.py index cc43b3aff..73fe46815 100644 --- a/fastmcp_slim/fastmcp/cli/client.py +++ b/fastmcp_slim/fastmcp/cli/client.py @@ -8,7 +8,7 @@ from pathlib import Path from typing import Annotated, Any, Literal import cyclopts -import mcp.types +import mcp_types from rich.console import Console from rich.markup import escape as escape_rich_markup @@ -177,7 +177,7 @@ async def _terminal_elicitation_handler( Prints the server's message and prompts for each field in the schema. The user can type 'decline' or 'cancel' instead of a value to abort. """ - from mcp.types import ElicitRequestFormParams + from mcp_types import ElicitRequestFormParams console.print(f"\n[bold yellow]Server asks:[/bold yellow] {message}") @@ -191,7 +191,7 @@ async def _terminal_elicitation_handler( return ElicitResult(action="cancel") return ElicitResult(action="accept", content={}) - schema = params.requestedSchema + schema = params.requested_schema properties = schema.get("properties", {}) required = set(schema.get("required", [])) @@ -367,11 +367,11 @@ def _json_schema_type_to_str(schema: dict[str, Any]) -> str: return _JSON_SCHEMA_TYPE_MAP.get(schema_type, schema_type) -def format_tool_signature(tool: mcp.types.Tool) -> str: +def format_tool_signature(tool: mcp_types.Tool) -> str: """Build ``name(param: type, ...) -> return_type`` from a tool's JSON schemas.""" params: list[str] = [] - schema = tool.inputSchema + schema = tool.input_schema properties = schema.get("properties", {}) required = set(schema.get("required", [])) @@ -386,8 +386,8 @@ def format_tool_signature(tool: mcp.types.Tool) -> str: sig = f"{tool.name}({', '.join(params)})" - if tool.outputSchema: - ret = _json_schema_type_to_str(tool.outputSchema) + if tool.output_schema: + ret = _json_schema_type_to_str(tool.output_schema) sig += f" -> {ret}" return sig @@ -422,7 +422,7 @@ def _format_call_result_text(result: CallToolResult) -> None: if result.is_error: for block in result.content: - if isinstance(block, mcp.types.TextContent): + if isinstance(block, mcp_types.TextContent): console.print( f"[bold red]Error:[/bold red] {_sanitize_untrusted_text(block.text)}" ) @@ -437,26 +437,26 @@ def _format_call_result_text(result: CallToolResult) -> None: return for block in result.content: - if isinstance(block, mcp.types.TextContent): + if isinstance(block, mcp_types.TextContent): console.print(_sanitize_untrusted_text(block.text)) - elif isinstance(block, mcp.types.ImageContent): + elif isinstance(block, mcp_types.ImageContent): size = len(block.data) * 3 // 4 # rough decoded size - console.print(f"[dim][Image: {block.mimeType}, ~{size} bytes][/dim]") - elif isinstance(block, mcp.types.AudioContent): + console.print(f"[dim][Image: {block.mime_type}, ~{size} bytes][/dim]") + elif isinstance(block, mcp_types.AudioContent): size = len(block.data) * 3 // 4 - console.print(f"[dim][Audio: {block.mimeType}, ~{size} bytes][/dim]") + console.print(f"[dim][Audio: {block.mime_type}, ~{size} bytes][/dim]") else: console.print(_sanitize_untrusted_text(str(block))) -def _content_block_to_dict(block: mcp.types.ContentBlock) -> dict[str, Any]: +def _content_block_to_dict(block: mcp_types.ContentBlock) -> dict[str, Any]: """Serialize a single content block to a JSON-safe dict.""" - if isinstance(block, mcp.types.TextContent): + if isinstance(block, mcp_types.TextContent): return {"type": "text", "text": block.text} - if isinstance(block, mcp.types.ImageContent): - return {"type": "image", "mimeType": block.mimeType, "data": block.data} - if isinstance(block, mcp.types.AudioContent): - return {"type": "audio", "mimeType": block.mimeType, "data": block.data} + if isinstance(block, mcp_types.ImageContent): + return {"type": "image", "mimeType": block.mime_type, "data": block.data} + if isinstance(block, mcp_types.AudioContent): + return {"type": "audio", "mimeType": block.mime_type, "data": block.data} return {"type": "unknown", "value": str(block)} @@ -470,15 +470,15 @@ def _call_result_to_dict(result: CallToolResult) -> dict[str, Any]: return out -def _tools_to_json(tools: list[mcp.types.Tool]) -> list[dict[str, Any]]: +def _tools_to_json(tools: list[mcp_types.Tool]) -> list[dict[str, Any]]: """Serialize a list of tools to JSON-safe dicts.""" return [ { "name": t.name, "description": t.description, - "inputSchema": t.inputSchema, - **({"outputSchema": t.outputSchema} if t.outputSchema else {}), + "inputSchema": t.input_schema, + **({"outputSchema": t.output_schema} if t.output_schema else {}), } for t in tools ] @@ -512,9 +512,9 @@ async def _handle_tool_call( sys.exit(1) tool = tool_map[tool_name] - parsed_args = parse_tool_arguments(arguments, input_json, tool.inputSchema) + parsed_args = parse_tool_arguments(arguments, input_json, tool.input_schema) - required = set(tool.inputSchema.get("required", [])) + required = set(tool.input_schema.get("required", [])) provided = set(parsed_args.keys()) missing = required - provided if missing: @@ -549,19 +549,19 @@ async def _handle_resource( if json_output: data = [] for block in contents: - if isinstance(block, mcp.types.TextResourceContents): + if isinstance(block, mcp_types.TextResourceContents): data.append( { "uri": str(block.uri), - "mimeType": block.mimeType, + "mimeType": block.mime_type, "text": block.text, } ) - elif isinstance(block, mcp.types.BlobResourceContents): + elif isinstance(block, mcp_types.BlobResourceContents): data.append( { "uri": str(block.uri), - "mimeType": block.mimeType, + "mimeType": block.mime_type, "blob": block.blob, } ) @@ -569,11 +569,11 @@ async def _handle_resource( return for block in contents: - if isinstance(block, mcp.types.TextResourceContents): + if isinstance(block, mcp_types.TextResourceContents): console.print(_sanitize_untrusted_text(block.text)) - elif isinstance(block, mcp.types.BlobResourceContents): + elif isinstance(block, mcp_types.BlobResourceContents): size = len(block.blob) * 3 // 4 - console.print(f"[dim][Blob: {block.mimeType}, ~{size} bytes][/dim]") + console.print(f"[dim][Blob: {block.mime_type}, ~{size} bytes][/dim]") async def _handle_prompt( @@ -621,12 +621,12 @@ async def _handle_prompt( for msg in result.messages: console.print(f"[bold]{_sanitize_untrusted_text(msg.role)}:[/bold]") - if isinstance(msg.content, mcp.types.TextContent): + if isinstance(msg.content, mcp_types.TextContent): console.print(f" {_sanitize_untrusted_text(msg.content.text)}") - elif isinstance(msg.content, mcp.types.ImageContent): + elif isinstance(msg.content, mcp_types.ImageContent): size = len(msg.content.data) * 3 // 4 console.print( - f" [dim][Image: {msg.content.mimeType}, ~{size} bytes][/dim]" + f" [dim][Image: {msg.content.mime_type}, ~{size} bytes][/dim]" ) else: console.print(f" {_sanitize_untrusted_text(str(msg.content))}") @@ -718,7 +718,7 @@ async def list_command( "uri": str(r.uri), "name": r.name, "description": r.description, - "mimeType": r.mimeType, + "mimeType": r.mime_type, } for r in res ] @@ -749,9 +749,9 @@ async def list_command( f" {_sanitize_untrusted_text(tool.description)}" ) if input_schema: - _print_schema("Input", tool.inputSchema) - if output_schema and tool.outputSchema: - _print_schema("Output", tool.outputSchema) + _print_schema("Input", tool.input_schema) + if output_schema and tool.output_schema: + _print_schema("Output", tool.output_schema) console.print() if resources: diff --git a/fastmcp_slim/fastmcp/cli/generate.py b/fastmcp_slim/fastmcp/cli/generate.py index c46cac50e..14577655e 100644 --- a/fastmcp_slim/fastmcp/cli/generate.py +++ b/fastmcp_slim/fastmcp/cli/generate.py @@ -9,9 +9,9 @@ from typing import Annotated, Any from urllib.parse import urlparse import cyclopts -import mcp.types +import mcp_types import pydantic_core -from mcp import McpError +from mcp import MCPError from rich.console import Console from fastmcp.cli.client import _build_client, resolve_server_spec @@ -163,9 +163,9 @@ def _to_python_identifier(name: str) -> str: return safe -def _tool_function_source(tool: mcp.types.Tool) -> str: +def _tool_function_source(tool: mcp_types.Tool) -> str: """Generate the source for a single ``@call_tool_app.command`` function.""" - schema = tool.inputSchema + schema = tool.input_schema properties: dict[str, Any] = schema.get("properties", {}) required = set(schema.get("required", [])) @@ -285,7 +285,7 @@ def generate_cli_script( server_spec: str, transport_code: str, extra_imports: set[str], - tools: list[mcp.types.Tool], + tools: list[mcp_types.Tool], ) -> str: """Generate the full CLI script source code.""" @@ -309,7 +309,7 @@ def generate_cli_script( lines.append("from typing import Annotated") lines.append("") lines.append("import cyclopts") - lines.append("import mcp.types") + lines.append("import mcp_types") lines.append("from rich.console import Console") lines.append("") lines.append("from fastmcp import Client") @@ -346,7 +346,7 @@ def generate_cli_script( def _print_tool_result(result): if result.is_error: for block in result.content: - if isinstance(block, mcp.types.TextContent): + if isinstance(block, mcp_types.TextContent): console.print(f"[bold red]Error:[/bold red] {block.text}") else: console.print(f"[bold red]Error:[/bold red] {block}") @@ -357,14 +357,14 @@ def generate_cli_script( return for block in result.content: - if isinstance(block, mcp.types.TextContent): + if isinstance(block, mcp_types.TextContent): console.print(block.text) - elif isinstance(block, mcp.types.ImageContent): + elif isinstance(block, mcp_types.ImageContent): size = len(block.data) * 3 // 4 - console.print(f"[dim][Image: {block.mimeType}, ~{size} bytes][/dim]") - elif isinstance(block, mcp.types.AudioContent): + console.print(f"[dim][Image: {block.mime_type}, ~{size} bytes][/dim]") + elif isinstance(block, mcp_types.AudioContent): size = len(block.data) * 3 // 4 - console.print(f"[dim][Audio: {block.mimeType}, ~{size} bytes][/dim]") + console.print(f"[dim][Audio: {block.mime_type}, ~{size} bytes][/dim]") async def _call_tool(tool_name: str, arguments: dict) -> None: @@ -401,8 +401,8 @@ def generate_cli_script( return for tool in tools: sig_parts = [] - props = tool.inputSchema.get("properties", {}) - required = set(tool.inputSchema.get("required", [])) + props = tool.input_schema.get("properties", {}) + required = set(tool.input_schema.get("required", [])) for pname, pschema in props.items(): ptype = pschema.get("type", "string") if pname in required: @@ -439,11 +439,11 @@ def generate_cli_script( async with Client(CLIENT_SPEC) as client: contents = await client.read_resource(uri) for block in contents: - if isinstance(block, mcp.types.TextResourceContents): + if isinstance(block, mcp_types.TextResourceContents): console.print(block.text) - elif isinstance(block, mcp.types.BlobResourceContents): + elif isinstance(block, mcp_types.BlobResourceContents): size = len(block.blob) * 3 // 4 - console.print(f"[dim][Blob: {block.mimeType}, ~{size} bytes][/dim]") + console.print(f"[dim][Blob: {block.mime_type}, ~{size} bytes][/dim]") @app.command @@ -483,11 +483,11 @@ def generate_cli_script( result = await client.get_prompt(name, parsed or None) for msg in result.messages: console.print(f"[bold]{msg.role}:[/bold]") - if isinstance(msg.content, mcp.types.TextContent): + if isinstance(msg.content, mcp_types.TextContent): console.print(f" {msg.content.text}") - elif isinstance(msg.content, mcp.types.ImageContent): + elif isinstance(msg.content, mcp_types.ImageContent): size = len(msg.content.data) * 3 // 4 - console.print(f" [dim][Image: {msg.content.mimeType}, ~{size} bytes][/dim]") + console.print(f" [dim][Image: {msg.content.mime_type}, ~{size} bytes][/dim]") else: console.print(f" {msg.content}") console.print()""") @@ -564,9 +564,9 @@ def _schema_type_label(prop_schema: dict[str, Any]) -> str: return label -def _tool_skill_section(tool: mcp.types.Tool, cli_filename: str) -> str: +def _tool_skill_section(tool: mcp_types.Tool, cli_filename: str) -> str: """Generate a SKILL.md section for a single tool.""" - schema = tool.inputSchema + schema = tool.input_schema properties: dict[str, Any] = schema.get("properties", {}) required = set(schema.get("required", [])) @@ -619,7 +619,7 @@ def _tool_skill_section(tool: mcp.types.Tool, cli_filename: str) -> str: def generate_skill_content( server_name: str, cli_filename: str, - tools: list[mcp.types.Tool], + tools: list[mcp_types.Tool], ) -> str: """Generate a SKILL.md file for a generated CLI script.""" skill_name = ( @@ -754,7 +754,7 @@ async def generate_cli_command( f"[dim]Discovered {len(tools)} tool(s) from {server_spec}[/dim]" ) - except (RuntimeError, TimeoutError, McpError, OSError) as exc: + except (RuntimeError, TimeoutError, MCPError, OSError) as exc: console.print(f"[bold red]Error:[/bold red] Could not connect: {exc}") sys.exit(1) diff --git a/fastmcp_slim/fastmcp/cli/run.py b/fastmcp_slim/fastmcp/cli/run.py index ba9a2ee46..476c0267d 100644 --- a/fastmcp_slim/fastmcp/cli/run.py +++ b/fastmcp_slim/fastmcp/cli/run.py @@ -12,7 +12,7 @@ from collections.abc import Callable from pathlib import Path from typing import Any, Literal -from mcp.server.fastmcp import FastMCP as FastMCP1x +from mcp.server.mcpserver import MCPServer as SDKServer from watchfiles import Change, awatch import fastmcp @@ -233,8 +233,8 @@ async def run_command( # Run the server - # handle v1 servers - if isinstance(server, FastMCP1x): + # handle the SDK's own high-level MCPServer (not a fastmcp.FastMCP) + if isinstance(server, SDKServer): await run_v1_server_async(server, host=host, port=port, transport=transport) return @@ -309,7 +309,7 @@ def run_module_command( async def run_v1_server_async( - server: FastMCP1x, + server: SDKServer, host: str | None = None, port: int | None = None, transport: TransportType | None = None, @@ -322,18 +322,21 @@ async def run_v1_server_async( port: Port to bind to transport: Transport protocol to use """ + # In v1 (MCPServer), host/port are no longer stored on `settings`; they are + # passed directly to the transport runners as keyword arguments. + bind_kwargs: dict[str, Any] = {} if host is not None: - server.settings.host = host + bind_kwargs["host"] = host if port is not None: - server.settings.port = port + bind_kwargs["port"] = port match transport: case "stdio": await server.run_stdio_async() case "http" | "streamable-http" | None: - await server.run_streamable_http_async() + await server.run_streamable_http_async(**bind_kwargs) case "sse": - await server.run_sse_async() + await server.run_sse_async(**bind_kwargs) def _watch_filter(_change: Change, path: str) -> bool: diff --git a/fastmcp_slim/fastmcp/client/_sdk_context_shim.py b/fastmcp_slim/fastmcp/client/_sdk_context_shim.py new file mode 100644 index 000000000..958bec383 --- /dev/null +++ b/fastmcp_slim/fastmcp/client/_sdk_context_shim.py @@ -0,0 +1,33 @@ +"""Subscriptable request-context alias for FastMCP client handler signatures. + +FastMCP exposes public generic handler type aliases (``SamplingHandler``, +``RootsHandler``, ``ElicitationHandler``) parameterized over a session and a +lifespan-context type. The MCP SDK v2 request context ( +``mcp.client.ClientRequestContext``) is a plain ``kw_only`` dataclass and is +NOT subscriptable, so it cannot back those two-parameter aliases directly. + +This module keeps a subscriptable ``RequestContext[SessionT, LifespanContextT]`` +generic so the public alias surface is preserved unchanged. It is a permanent +part of the client type surface, not a migration placeholder. The concrete +context object handlers receive at runtime is the SDK's ``ClientRequestContext``; +our ``create_*_callback`` wrappers pass it through opaquely. +""" + +from __future__ import annotations + +from typing import Any, Generic, TypeVar + +LifespanContextT = TypeVar("LifespanContextT") +_SessionT = TypeVar("_SessionT") + + +class RequestContext(Generic[_SessionT, LifespanContextT]): + """Placeholder for the removed SDK ``RequestContext`` generic. + + Subscriptable with two type parameters to match existing client handler + annotations. Not instantiated anywhere; exists only so module imports and + annotation evaluation succeed until the Phase C client port lands. + """ + + def __class_getitem__(cls, item: Any) -> Any: # pragma: no cover - typing only + return super().__class_getitem__(item) # type: ignore[misc] diff --git a/fastmcp_slim/fastmcp/client/auth/oauth.py b/fastmcp_slim/fastmcp/client/auth/oauth.py index 7c7d5cb84..2a15697b6 100644 --- a/fastmcp_slim/fastmcp/client/auth/oauth.py +++ b/fastmcp_slim/fastmcp/client/auth/oauth.py @@ -14,6 +14,7 @@ from key_value.aio.stores.memory import MemoryStore from mcp.client.auth import OAuthClientProvider, TokenStorage from mcp.shared._httpx_utils import McpHttpClientFactory from mcp.shared.auth import ( + AuthorizationCodeResult, OAuthClientInformationFull, OAuthClientMetadata, OAuthToken, @@ -360,8 +361,8 @@ class OAuth(OAuthClientProvider): logger.info(f"OAuth authorization URL: {authorization_url}") webbrowser.open(authorization_url) - async def callback_handler(self) -> tuple[str, str | None]: - """Handle OAuth callback and return (auth_code, state).""" + async def callback_handler(self) -> AuthorizationCodeResult: + """Handle OAuth callback and return the authorization code result.""" # Create result container and event to capture the OAuth response result = OAuthCallbackResult() result_ready = anyio.Event() @@ -387,7 +388,11 @@ class OAuth(OAuthClientProvider): await result_ready.wait() if result.error: raise result.error - return result.code, result.state # type: ignore + # `result.code` is set once `result_ready` fires without error. + return AuthorizationCodeResult( + code=result.code, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + state=result.state, + ) except TimeoutError as e: raise TimeoutError( f"OAuth callback timed out after {self._callback_timeout} seconds" diff --git a/fastmcp_slim/fastmcp/client/client.py b/fastmcp_slim/fastmcp/client/client.py index f2a70924d..94ec0ee49 100644 --- a/fastmcp_slim/fastmcp/client/client.py +++ b/fastmcp_slim/fastmcp/client/client.py @@ -14,10 +14,15 @@ from typing import TYPE_CHECKING, Any, Generic, Literal, TypeVar, cast, overload import anyio import httpx -import mcp.types +import mcp_types from exceptiongroup import catch -from mcp import ClientSession, McpError -from mcp.types import GetTaskResult, TaskStatusNotification +from mcp import ClientSession, MCPError +from mcp.client.extension import NotificationBinding +from mcp_types import ( + GetTaskResult, + TaskStatusNotification, + TaskStatusNotificationParams, +) from pydantic import AnyUrl import fastmcp as fastmcp @@ -57,10 +62,7 @@ from fastmcp.client.tasks import ( from fastmcp.mcp_config import MCPConfig from fastmcp.utilities.exceptions import get_catch_handlers from fastmcp.utilities.logging import get_logger -from fastmcp.utilities.timeout import ( - normalize_timeout_to_seconds, - normalize_timeout_to_timedelta, -) +from fastmcp.utilities.timeout import normalize_timeout_to_seconds if TYPE_CHECKING: from fastmcp.server import FastMCP @@ -70,11 +72,11 @@ else: from .transports import ( ClientTransport, ClientTransportT, - FastMCP1Server, FastMCPTransport, MCPConfigTransport, NodeStdioTransport, PythonStdioTransport, + SDKServer, SessionKwargs, SSETransport, StreamableHttpTransport, @@ -113,14 +115,14 @@ class ClientSessionState: session_task: asyncio.Task | None = None ready_event: anyio.Event = field(default_factory=anyio.Event) stop_event: anyio.Event = field(default_factory=anyio.Event) - initialize_result: mcp.types.InitializeResult | None = None + initialize_result: mcp_types.InitializeResult | None = None @dataclass class CallToolResult: """Parsed result from a tool call.""" - content: list[mcp.types.ContentBlock] + content: list[mcp_types.ContentBlock] structured_content: dict[str, Any] | None meta: dict[str, Any] | None data: Any = None @@ -207,7 +209,7 @@ class Client( @overload def __init__( self: Client[FastMCPTransport], - transport: FastMCP | FastMCP1Server, + transport: FastMCP | SDKServer, *args: Any, **kwargs: Any, ) -> None: ... @@ -246,7 +248,7 @@ class Client( transport: ( ClientTransportT | FastMCP - | FastMCP1Server + | SDKServer | AnyUrl | Path | MCPConfig @@ -256,7 +258,7 @@ class Client( name: str | None = None, roots: RootsList | RootsHandler | None = None, sampling_handler: SamplingHandler | None = None, - sampling_capabilities: mcp.types.SamplingCapability | None = None, + sampling_capabilities: mcp_types.SamplingCapability | None = None, elicitation_handler: ElicitationHandler | None = None, log_handler: LogHandler | None = None, message_handler: MessageHandlerT | MessageHandler | None = None, @@ -264,7 +266,7 @@ class Client( timeout: datetime.timedelta | float | int | None = None, auto_initialize: bool = True, init_timeout: datetime.timedelta | float | int | None = None, - client_info: mcp.types.Implementation | None = None, + client_info: mcp_types.Implementation | None = None, auth: httpx.Auth | Literal["oauth"] | str | None = None, verify: ssl.SSLContext | bool | str | None = None, ) -> None: @@ -305,8 +307,8 @@ class Client( self._progress_handler = progress_handler - # Convert timeout to timedelta if needed - timeout = normalize_timeout_to_timedelta(timeout) + # Convert request timeout to float seconds (0 means disabled -> None) + read_timeout_seconds = normalize_timeout_to_seconds(timeout) # handle init handshake timeout (0 means disabled) if init_timeout is None: @@ -320,8 +322,12 @@ class Client( "list_roots_callback": None, "logging_callback": create_log_callback(log_handler), "message_handler": message_handler or TaskNotificationHandler(self), - "read_timeout_seconds": timeout, + "read_timeout_seconds": read_timeout_seconds, "client_info": client_info, + # SDK v2 does not carry `notifications/tasks/status` in any protocol + # version's core notification tables, so it is never tee'd to the + # message_handler; a binding routes it to Task objects instead. + "notification_bindings": [self._task_status_binding()], } if roots is not None: @@ -334,7 +340,7 @@ class Client( self._session_kwargs["sampling_capabilities"] = ( sampling_capabilities if sampling_capabilities is not None - else mcp.types.SamplingCapability() + else mcp_types.SamplingCapability() ) if elicitation_handler is not None: @@ -384,7 +390,7 @@ class Client( return self._session_state.session @property - def initialize_result(self) -> mcp.types.InitializeResult | None: + def initialize_result(self) -> mcp_types.InitializeResult | None: """Get the result of the initialization request.""" return self._session_state.initialize_result @@ -395,7 +401,7 @@ class Client( def set_sampling_callback( self, sampling_callback: SamplingHandler, - sampling_capabilities: mcp.types.SamplingCapability | None = None, + sampling_capabilities: mcp_types.SamplingCapability | None = None, ) -> None: """Set the sampling callback for the client.""" self._session_kwargs["sampling_callback"] = create_sampling_callback( @@ -404,7 +410,7 @@ class Client( self._session_kwargs["sampling_capabilities"] = ( sampling_capabilities if sampling_capabilities is not None - else mcp.types.SamplingCapability() + else mcp_types.SamplingCapability() ) def set_elicitation_callback( @@ -458,6 +464,10 @@ class Client( new_client._session_kwargs["message_handler"] = TaskNotificationHandler( new_client ) + # Rebind the task-status notification binding so it routes to the clone. + new_client._session_kwargs["notification_bindings"] = [ + new_client._task_status_binding() + ] new_client.name += f":{secrets.token_hex(2)}" @@ -483,7 +493,7 @@ class Client( async def initialize( self, timeout: datetime.timedelta | float | int | None = None, - ) -> mcp.types.InitializeResult: + ) -> mcp_types.InitializeResult: """Send an initialize request to the server. This method performs the MCP initialization handshake with the server, @@ -511,7 +521,7 @@ class Client( client = Client(server, auto_initialize=False) async with client: result = await client.initialize() - print(f"Server: {result.serverInfo.name}") + print(f"Server: {result.server_info.name}") print(f"Instructions: {result.instructions}") ``` """ @@ -617,7 +627,7 @@ class Client( "Session task completed without exception but connection failed" ) # Preserve specific exception types that clients may want to handle - if isinstance(exception, httpx.HTTPStatusError | McpError): + if isinstance(exception, httpx.HTTPStatusError | MCPError): raise exception raise RuntimeError( f"Client failed to connect: {exception}" @@ -781,8 +791,11 @@ class Client( Called when notifications/tasks/status is received from server. Updates Task object's cache and triggers events/callbacks. """ - # Extract task ID from notification params - task_id = notification.params.taskId + self._handle_task_status_params(notification.params) + + def _handle_task_status_params(self, params: TaskStatusNotificationParams) -> None: + """Route task status notification params to the matching Task object.""" + task_id = params.task_id if not task_id: return @@ -792,9 +805,29 @@ class Client( task = task_ref() # Dereference weakref if task: # Convert notification params to GetTaskResult (they share the same fields via Task) - status = GetTaskResult.model_validate(notification.params.model_dump()) + status = GetTaskResult.model_validate(params.model_dump()) task._handle_status_notification(status) + def _task_status_binding(self) -> NotificationBinding[TaskStatusNotificationParams]: + """Build a binding routing `notifications/tasks/status` to Task objects. + + SDK v2 drops notifications whose method is absent from the negotiated + version's core tables before they reach the message_handler; a binding is + the supported channel for observing such vendor notifications. + """ + client_ref = weakref.ref(self) + + async def _handler(params: TaskStatusNotificationParams) -> None: + client = client_ref() + if client is not None: + client._handle_task_status_params(params) + + return NotificationBinding( + method="notifications/tasks/status", + params_type=TaskStatusNotificationParams, + handler=_handler, + ) + async def close(self): await self._disconnect(force=True) await self.transport.close() @@ -804,7 +837,7 @@ class Client( async def ping(self) -> bool: """Send a ping request.""" result = await self._await_with_session_monitoring(self.session.send_ping()) - return isinstance(result, mcp.types.EmptyResult) + return isinstance(result, mcp_types.EmptyResult) async def cancel( self, @@ -812,14 +845,12 @@ class Client( reason: str | None = None, ) -> None: """Send a cancellation notification for an in-progress request.""" - notification = mcp.types.ClientNotification( - root=mcp.types.CancelledNotification( - method="notifications/cancelled", - params=mcp.types.CancelledNotificationParams( - requestId=request_id, - reason=reason, - ), - ) + notification = mcp_types.CancelledNotification( + method="notifications/cancelled", + params=mcp_types.CancelledNotificationParams( + request_id=request_id, + reason=reason, + ), ) await self.session.send_notification(notification) @@ -831,41 +862,49 @@ class Client( message: str | None = None, ) -> None: """Send a progress notification.""" - await self.session.send_progress_notification( + # Deprecated upstream in SDK v2 but deliberately kept per compat directive; + # removed with the multi-round-trip follow-up. + await self.session.send_progress_notification( # ty: ignore[deprecated] progress_token, progress, total, message ) - async def set_logging_level(self, level: mcp.types.LoggingLevel) -> None: + async def set_logging_level(self, level: mcp_types.LoggingLevel) -> None: """Send a logging/setLevel request.""" - await self._await_with_session_monitoring(self.session.set_logging_level(level)) + # Deprecated upstream in SDK v2 but deliberately kept per compat directive; + # removed with the multi-round-trip follow-up. + await self._await_with_session_monitoring( + self.session.set_logging_level(level) # ty: ignore[deprecated] + ) async def send_roots_list_changed(self) -> None: """Send a roots/list_changed notification.""" - await self.session.send_roots_list_changed() + # Deprecated upstream in SDK v2 but deliberately kept per compat directive; + # removed with the multi-round-trip follow-up. + await self.session.send_roots_list_changed() # ty: ignore[deprecated] # --- Completion --- async def complete_mcp( self, - ref: mcp.types.ResourceTemplateReference | mcp.types.PromptReference, + ref: mcp_types.ResourceTemplateReference | mcp_types.PromptReference, argument: dict[str, str], context_arguments: dict[str, Any] | None = None, - ) -> mcp.types.CompleteResult: + ) -> mcp_types.CompleteResult: """Send a completion request and return the complete MCP protocol result. Args: - ref (mcp.types.ResourceTemplateReference | mcp.types.PromptReference): The reference to complete. + ref (mcp_types.ResourceTemplateReference | mcp_types.PromptReference): The reference to complete. argument (dict[str, str]): Arguments to pass to the completion request. context_arguments (dict[str, Any] | None, optional): Optional context arguments to include with the completion request. Defaults to None. Returns: - mcp.types.CompleteResult: The complete response object from the protocol, + mcp_types.CompleteResult: The complete response object from the protocol, containing the completion and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ logger.debug(f"[{self.name}] called complete: {ref}") @@ -878,24 +917,24 @@ class Client( async def complete( self, - ref: mcp.types.ResourceTemplateReference | mcp.types.PromptReference, + ref: mcp_types.ResourceTemplateReference | mcp_types.PromptReference, argument: dict[str, str], context_arguments: dict[str, Any] | None = None, - ) -> mcp.types.Completion: + ) -> mcp_types.Completion: """Send a completion request to the server. Args: - ref (mcp.types.ResourceTemplateReference | mcp.types.PromptReference): The reference to complete. + ref (mcp_types.ResourceTemplateReference | mcp_types.PromptReference): The reference to complete. argument (dict[str, str]): Arguments to pass to the completion request. context_arguments (dict[str, Any] | None, optional): Optional context arguments to include with the completion request. Defaults to None. Returns: - mcp.types.Completion: The completion object. + mcp_types.Completion: The completion object. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ result = await self.complete_mcp( ref=ref, argument=argument, context_arguments=context_arguments diff --git a/fastmcp_slim/fastmcp/client/elicitation.py b/fastmcp_slim/fastmcp/client/elicitation.py index 32db2a188..2b9ce5db4 100644 --- a/fastmcp_slim/fastmcp/client/elicitation.py +++ b/fastmcp_slim/fastmcp/client/elicitation.py @@ -3,15 +3,15 @@ from __future__ import annotations from collections.abc import Awaitable, Callable from typing import Any, Generic, TypeAlias -import mcp.types +import mcp_types from mcp import ClientSession -from mcp.client.session import ElicitationFnT -from mcp.shared.context import LifespanContextT, RequestContext -from mcp.types import ElicitRequestFormParams, ElicitRequestParams -from mcp.types import ElicitResult as MCPElicitResult +from mcp.client.session import ClientRequestContext, ElicitationFnT +from mcp_types import ElicitRequestFormParams, ElicitRequestParams +from mcp_types import ElicitResult as MCPElicitResult from pydantic_core import to_jsonable_python from typing_extensions import TypeVar +from fastmcp.client._sdk_context_shim import LifespanContextT, RequestContext from fastmcp.utilities.json_schema_type import json_schema_to_type __all__ = ["ElicitRequestParams", "ElicitResult", "ElicitationHandler"] @@ -39,22 +39,28 @@ def create_elicitation_callback( elicitation_handler: ElicitationHandler, ) -> ElicitationFnT: async def _elicitation_handler( - context: RequestContext[ClientSession, LifespanContextT], + context: ClientRequestContext, params: ElicitRequestParams, - ) -> MCPElicitResult | mcp.types.ErrorData: + ) -> MCPElicitResult | mcp_types.ErrorData: try: # requestedSchema only exists on ElicitRequestFormParams, not ElicitRequestURLParams if isinstance(params, ElicitRequestFormParams): - if params.requestedSchema == {"type": "object", "properties": {}}: + if params.requested_schema == {"type": "object", "properties": {}}: response_type = None else: - response_type = json_schema_to_type(params.requestedSchema) + response_type = json_schema_to_type(params.requested_schema) else: # URL-based elicitation doesn't have a schema response_type = None + # The public ElicitationHandler alias is typed against the + # subscriptable RequestContext shim; the runtime object is the SDK's + # ClientRequestContext, passed through opaquely. result = await elicitation_handler( - params.message, response_type, params, context + params.message, + response_type, + params, + context, # ty: ignore[invalid-argument-type] ) # if the user returns data, we assume they've accepted the elicitation if not isinstance(result, ElicitResult): @@ -65,7 +71,7 @@ def create_elicitation_callback( # (single "value" property). This lets handlers return T directly # for ctx.elicit("msg", str/int/float/bool). if isinstance(params, ElicitRequestFormParams) and set( - params.requestedSchema.get("properties", {}).keys() + params.requested_schema.get("properties", {}).keys() ) == {"value"}: content = {"value": content} else: @@ -80,8 +86,8 @@ def create_elicitation_callback( ) except Exception as e: - return mcp.types.ErrorData( - code=mcp.types.INTERNAL_ERROR, + return mcp_types.ErrorData( + code=mcp_types.INTERNAL_ERROR, message=str(e), ) diff --git a/fastmcp_slim/fastmcp/client/logging.py b/fastmcp_slim/fastmcp/client/logging.py index 2a8dd04e9..b9e4aefee 100644 --- a/fastmcp_slim/fastmcp/client/logging.py +++ b/fastmcp_slim/fastmcp/client/logging.py @@ -3,7 +3,7 @@ from logging import Logger from typing import TypeAlias from mcp.client.session import LoggingFnT -from mcp.types import LoggingMessageNotificationParams +from mcp_types import LoggingMessageNotificationParams from fastmcp.utilities.logging import get_logger diff --git a/fastmcp_slim/fastmcp/client/messages.py b/fastmcp_slim/fastmcp/client/messages.py index 361dfe0bf..7183a8e67 100644 --- a/fastmcp_slim/fastmcp/client/messages.py +++ b/fastmcp_slim/fastmcp/client/messages.py @@ -1,12 +1,12 @@ from typing import TypeAlias -import mcp.types +import mcp_types from mcp.client.session import MessageHandlerFnT from mcp.shared.session import RequestResponder Message: TypeAlias = ( - RequestResponder[mcp.types.ServerRequest, mcp.types.ClientResult] - | mcp.types.ServerNotification + RequestResponder[mcp_types.ServerRequest, mcp_types.ClientResult] + | mcp_types.ServerNotification | Exception ) @@ -21,8 +21,8 @@ class MessageHandler: async def __call__( self, - message: RequestResponder[mcp.types.ServerRequest, mcp.types.ClientResult] - | mcp.types.ServerNotification + message: RequestResponder[mcp_types.ServerRequest, mcp_types.ClientResult] + | mcp_types.ServerNotification | Exception, ) -> None: return await self.dispatch(message) @@ -31,98 +31,101 @@ class MessageHandler: # handle all messages await self.on_message(message) - match message: - # requests - case RequestResponder(): - # handle all requests - # TODO(ty): remove when ty supports match statement narrowing - await self.on_request(message) # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + # SDK v2 delivers server-to-client requests wrapped in a + # RequestResponder (with the request unwrapped on `.request`) and + # notifications unwrapped (the monolith notification model itself, no + # `.root` wrapper). `ServerNotification`/`ServerRequest` are UnionTypes, + # so they can't appear in class match patterns — branch on the concrete + # models directly. + if isinstance(message, RequestResponder): + # handle all requests + # ty doesn't narrow the generic RequestResponder cleanly here. + await self.on_request(message) # type: ignore[arg-type] # ty:ignore[invalid-argument-type] - # handle specific requests - # TODO(ty): remove type ignores when ty supports match statement narrowing - match message.request.root: # type: ignore[union-attr] # ty:ignore[unresolved-attribute] - case mcp.types.PingRequest(): - await self.on_ping(message.request.root) # type: ignore[union-attr] # ty:ignore[unresolved-attribute] - case mcp.types.ListRootsRequest(): - await self.on_list_roots(message.request.root) # type: ignore[union-attr] # ty:ignore[unresolved-attribute] - case mcp.types.CreateMessageRequest(): - await self.on_create_message(message.request.root) # type: ignore[union-attr] # ty:ignore[unresolved-attribute] + # handle specific requests + request = message.request + match request: + case mcp_types.PingRequest(): + await self.on_ping(request) + case mcp_types.ListRootsRequest(): + await self.on_list_roots(request) + case mcp_types.CreateMessageRequest(): + await self.on_create_message(request) - # notifications - case mcp.types.ServerNotification(): - # handle all notifications - await self.on_notification(message) + elif isinstance(message, Exception): + await self.on_exception(message) - # handle specific notifications - match message.root: - case mcp.types.CancelledNotification(): - await self.on_cancelled(message.root) - case mcp.types.ProgressNotification(): - await self.on_progress(message.root) - case mcp.types.LoggingMessageNotification(): - await self.on_logging_message(message.root) - case mcp.types.ToolListChangedNotification(): - await self.on_tool_list_changed(message.root) - case mcp.types.ResourceListChangedNotification(): - await self.on_resource_list_changed(message.root) - case mcp.types.PromptListChangedNotification(): - await self.on_prompt_list_changed(message.root) - case mcp.types.ResourceUpdatedNotification(): - await self.on_resource_updated(message.root) + else: + # notifications (unwrapped monolith models) + await self.on_notification(message) - case Exception(): - await self.on_exception(message) + # handle specific notifications + match message: + case mcp_types.CancelledNotification(): + await self.on_cancelled(message) + case mcp_types.ProgressNotification(): + await self.on_progress(message) + case mcp_types.LoggingMessageNotification(): + await self.on_logging_message(message) + case mcp_types.ToolListChangedNotification(): + await self.on_tool_list_changed(message) + case mcp_types.ResourceListChangedNotification(): + await self.on_resource_list_changed(message) + case mcp_types.PromptListChangedNotification(): + await self.on_prompt_list_changed(message) + case mcp_types.ResourceUpdatedNotification(): + await self.on_resource_updated(message) async def on_message(self, message: Message) -> None: pass async def on_request( - self, message: RequestResponder[mcp.types.ServerRequest, mcp.types.ClientResult] + self, message: RequestResponder[mcp_types.ServerRequest, mcp_types.ClientResult] ) -> None: pass - async def on_ping(self, message: mcp.types.PingRequest) -> None: + async def on_ping(self, message: mcp_types.PingRequest) -> None: pass - async def on_list_roots(self, message: mcp.types.ListRootsRequest) -> None: + async def on_list_roots(self, message: mcp_types.ListRootsRequest) -> None: pass - async def on_create_message(self, message: mcp.types.CreateMessageRequest) -> None: + async def on_create_message(self, message: mcp_types.CreateMessageRequest) -> None: pass - async def on_notification(self, message: mcp.types.ServerNotification) -> None: + async def on_notification(self, message: mcp_types.ServerNotification) -> None: pass async def on_exception(self, message: Exception) -> None: pass - async def on_progress(self, message: mcp.types.ProgressNotification) -> None: + async def on_progress(self, message: mcp_types.ProgressNotification) -> None: pass async def on_logging_message( - self, message: mcp.types.LoggingMessageNotification + self, message: mcp_types.LoggingMessageNotification ) -> None: pass async def on_tool_list_changed( - self, message: mcp.types.ToolListChangedNotification + self, message: mcp_types.ToolListChangedNotification ) -> None: pass async def on_resource_list_changed( - self, message: mcp.types.ResourceListChangedNotification + self, message: mcp_types.ResourceListChangedNotification ) -> None: pass async def on_prompt_list_changed( - self, message: mcp.types.PromptListChangedNotification + self, message: mcp_types.PromptListChangedNotification ) -> None: pass async def on_resource_updated( - self, message: mcp.types.ResourceUpdatedNotification + self, message: mcp_types.ResourceUpdatedNotification ) -> None: pass - async def on_cancelled(self, message: mcp.types.CancelledNotification) -> None: + async def on_cancelled(self, message: mcp_types.CancelledNotification) -> None: pass diff --git a/fastmcp_slim/fastmcp/client/mixins/prompts.py b/fastmcp_slim/fastmcp/client/mixins/prompts.py index 5c607ca9f..c31a09b46 100644 --- a/fastmcp_slim/fastmcp/client/mixins/prompts.py +++ b/fastmcp_slim/fastmcp/client/mixins/prompts.py @@ -6,7 +6,7 @@ import uuid import weakref from typing import TYPE_CHECKING, Any, Literal, cast, overload -import mcp.types +import mcp_types import pydantic_core from pydantic import RootModel @@ -24,7 +24,7 @@ AUTO_PAGINATION_MAX_PAGES = 250 # Type alias for task response union (SEP-1686 graceful degradation) PromptTaskResponseUnion = RootModel[ - mcp.types.CreateTaskResult | mcp.types.GetPromptResult + mcp_types.CreateTaskResult | mcp_types.GetPromptResult ] @@ -35,19 +35,19 @@ class ClientPromptsMixin: async def list_prompts_mcp( self: Client, *, cursor: str | None = None - ) -> mcp.types.ListPromptsResult: + ) -> mcp_types.ListPromptsResult: """Send a prompts/list request and return the complete MCP protocol result. Args: cursor: Optional pagination cursor from a previous request's nextCursor. Returns: - mcp.types.ListPromptsResult: The complete response object from the protocol, + mcp_types.ListPromptsResult: The complete response object from the protocol, containing the list of prompts and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ with client_span( "prompts/list", @@ -57,15 +57,20 @@ class ClientPromptsMixin: ): logger.debug(f"[{self.name}] called list_prompts") + params = ( + mcp_types.PaginatedRequestParams(cursor=cursor) + if cursor is not None + else None + ) result = await self._await_with_session_monitoring( - self.session.list_prompts(cursor=cursor) + self.session.list_prompts(params=params) ) return result async def list_prompts( self: Client, max_pages: int = AUTO_PAGINATION_MAX_PAGES, - ) -> list[mcp.types.Prompt]: + ) -> list[mcp_types.Prompt]: """Retrieve all prompts available on the server. This method automatically fetches all pages if the server paginates results, @@ -76,29 +81,29 @@ class ClientPromptsMixin: max_pages: Maximum number of pages to fetch before raising. Defaults to 250. Returns: - list[mcp.types.Prompt]: A list of all Prompt objects. + list[mcp_types.Prompt]: A list of all Prompt objects. Raises: RuntimeError: If the page limit is reached before pagination completes. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ - all_prompts: list[mcp.types.Prompt] = [] + all_prompts: list[mcp_types.Prompt] = [] cursor: str | None = None seen_cursors: set[str] = set() for _ in range(max_pages): result = await self.list_prompts_mcp(cursor=cursor) all_prompts.extend(result.prompts) - if not result.nextCursor: + if not result.next_cursor: break - if result.nextCursor in seen_cursors: + if result.next_cursor in seen_cursors: logger.warning( f"[{self.name}] Server returned duplicate pagination cursor" - f" {result.nextCursor!r} for list_prompts; stopping pagination" + f" {result.next_cursor!r} for list_prompts; stopping pagination" ) break - seen_cursors.add(result.nextCursor) - cursor = result.nextCursor + seen_cursors.add(result.next_cursor) + cursor = result.next_cursor else: raise RuntimeError( f"[{self.name}] Reached auto-pagination limit" @@ -115,7 +120,7 @@ class ClientPromptsMixin: name: str, arguments: dict[str, Any] | None = None, meta: dict[str, Any] | None = None, - ) -> mcp.types.GetPromptResult: + ) -> mcp_types.GetPromptResult: """Send a prompts/get request and return the complete MCP protocol result. Args: @@ -124,12 +129,12 @@ class ClientPromptsMixin: meta (dict[str, Any] | None, optional): Request metadata (e.g., for SEP-1686 tasks). Defaults to None. Returns: - mcp.types.GetPromptResult: The complete response object from the protocol, + mcp_types.GetPromptResult: The complete response object from the protocol, containing the prompt messages and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ with client_span( f"prompts/get {name}", @@ -155,23 +160,24 @@ class ClientPromptsMixin: # Inject trace context into meta for propagation to server propagated_meta = inject_trace_context(meta) - request_meta = cast(mcp.types.RequestParams.Meta | None, propagated_meta) + request_meta = cast("mcp_types.RequestParamsMeta | None", propagated_meta) # If meta provided, use send_request for SEP-1686 task support if propagated_meta: - task_dict = propagated_meta.get("modelcontextprotocol.io/task") - request = mcp.types.GetPromptRequest( - params=mcp.types.GetPromptRequestParams( + # SDK v2: GetPromptRequestParams has no `task` field, so prompt + # gets cannot be submitted as background tasks over the wire and + # always graceful-degrade to immediate execution (sdk-feedback #3). + request = mcp_types.GetPromptRequest( + params=mcp_types.GetPromptRequestParams( name=name, arguments=serialized_arguments, - task=mcp.types.TaskMetadata(**task_dict) if task_dict else None, _meta=request_meta, # type: ignore[unknown-argument] # pydantic alias ) ) result = await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] - result_type=mcp.types.GetPromptResult, + request=request, # type: ignore[arg-type] + result_type=mcp_types.GetPromptResult, ) ) else: @@ -189,7 +195,7 @@ class ClientPromptsMixin: version: str | None = None, meta: dict[str, Any] | None = None, task: Literal[False] = False, - ) -> mcp.types.GetPromptResult: ... + ) -> mcp_types.GetPromptResult: ... @overload async def get_prompt( @@ -214,7 +220,7 @@ class ClientPromptsMixin: task: bool = False, task_id: str | None = None, ttl: int = 60000, - ) -> mcp.types.GetPromptResult | PromptTask: + ) -> mcp_types.GetPromptResult | PromptTask: """Retrieve a rendered prompt message list from the server. Args: @@ -227,12 +233,12 @@ class ClientPromptsMixin: ttl (int): Time to keep results available in milliseconds (default 60s). Returns: - mcp.types.GetPromptResult | PromptTask: The complete response object if task=False, + mcp_types.GetPromptResult | PromptTask: The complete response object if task=False, or a PromptTask object if task=True. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ # Merge version into request-level meta (not arguments) request_meta = dict(meta) if meta else {} @@ -275,9 +281,14 @@ class ClientPromptsMixin: PromptTask: Future-like object for accessing task status and results """ # Per SEP-1686 final spec: client sends only ttl, server generates taskId - # Inject trace context into meta for propagation to server + # Inject trace context into meta for propagation to server. + # SDK v2: request `_meta` is `RequestParamsMeta` (a TypedDict), not + # the old `RequestParams.Meta` nested model. propagated_meta = inject_trace_context(meta) - request_meta = cast(mcp.types.RequestParams.Meta | None, propagated_meta) + request_meta = cast( + "mcp_types.RequestParamsMeta | None", + propagated_meta if propagated_meta else None, + ) # Serialize arguments for MCP protocol serialized_arguments: dict[str, str] | None = None @@ -291,11 +302,14 @@ class ClientPromptsMixin: "utf-8" ) - request = mcp.types.GetPromptRequest( - params=mcp.types.GetPromptRequestParams( + # SDK v2: GetPromptRequestParams has no `task` field, so this request + # cannot carry task metadata over the wire and the server graceful- + # degrades to immediate execution (sdk-feedback #3). `ttl` is retained on + # the public API but has no wire representation here. + request = mcp_types.GetPromptRequest( + params=mcp_types.GetPromptRequestParams( name=name, arguments=serialized_arguments, - task=mcp.types.TaskMetadata(ttl=ttl), _meta=request_meta, # type: ignore[unknown-argument] # pydantic alias ) ) @@ -303,15 +317,15 @@ class ClientPromptsMixin: # Server returns CreateTaskResult (task accepted) or GetPromptResult (graceful degradation) wrapped_result = await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + request=request, # type: ignore[arg-type] result_type=PromptTaskResponseUnion, ) ) raw_result = wrapped_result.root - if isinstance(raw_result, mcp.types.CreateTaskResult): + if isinstance(raw_result, mcp_types.CreateTaskResult): # Task was accepted - extract task info from CreateTaskResult - server_task_id = raw_result.task.taskId + server_task_id = raw_result.task.task_id self._submitted_task_ids.add(server_task_id) task_obj = PromptTask( diff --git a/fastmcp_slim/fastmcp/client/mixins/resources.py b/fastmcp_slim/fastmcp/client/mixins/resources.py index acc19593c..d0c6f50e2 100644 --- a/fastmcp_slim/fastmcp/client/mixins/resources.py +++ b/fastmcp_slim/fastmcp/client/mixins/resources.py @@ -6,7 +6,7 @@ import uuid import weakref from typing import TYPE_CHECKING, Any, Literal, cast, overload -import mcp.types +import mcp_types from pydantic import AnyUrl, RootModel if TYPE_CHECKING: @@ -23,7 +23,7 @@ AUTO_PAGINATION_MAX_PAGES = 250 # Type alias for task response union (SEP-1686 graceful degradation) ResourceTaskResponseUnion = RootModel[ - mcp.types.CreateTaskResult | mcp.types.ReadResourceResult + mcp_types.CreateTaskResult | mcp_types.ReadResourceResult ] @@ -34,19 +34,19 @@ class ClientResourcesMixin: async def list_resources_mcp( self: Client, *, cursor: str | None = None - ) -> mcp.types.ListResourcesResult: + ) -> mcp_types.ListResourcesResult: """Send a resources/list request and return the complete MCP protocol result. Args: cursor: Optional pagination cursor from a previous request's nextCursor. Returns: - mcp.types.ListResourcesResult: The complete response object from the protocol, + mcp_types.ListResourcesResult: The complete response object from the protocol, containing the list of resources and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ with client_span( "resources/list", @@ -56,15 +56,20 @@ class ClientResourcesMixin: ): logger.debug(f"[{self.name}] called list_resources") + params = ( + mcp_types.PaginatedRequestParams(cursor=cursor) + if cursor is not None + else None + ) result = await self._await_with_session_monitoring( - self.session.list_resources(cursor=cursor) + self.session.list_resources(params=params) ) return result async def list_resources( self: Client, max_pages: int = AUTO_PAGINATION_MAX_PAGES, - ) -> list[mcp.types.Resource]: + ) -> list[mcp_types.Resource]: """Retrieve all resources available on the server. This method automatically fetches all pages if the server paginates results, @@ -75,29 +80,29 @@ class ClientResourcesMixin: max_pages: Maximum number of pages to fetch before raising. Defaults to 250. Returns: - list[mcp.types.Resource]: A list of all Resource objects. + list[mcp_types.Resource]: A list of all Resource objects. Raises: RuntimeError: If the page limit is reached before pagination completes. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ - all_resources: list[mcp.types.Resource] = [] + all_resources: list[mcp_types.Resource] = [] cursor: str | None = None seen_cursors: set[str] = set() for _ in range(max_pages): result = await self.list_resources_mcp(cursor=cursor) all_resources.extend(result.resources) - if not result.nextCursor: + if not result.next_cursor: break - if result.nextCursor in seen_cursors: + if result.next_cursor in seen_cursors: logger.warning( f"[{self.name}] Server returned duplicate pagination cursor" - f" {result.nextCursor!r} for list_resources; stopping pagination" + f" {result.next_cursor!r} for list_resources; stopping pagination" ) break - seen_cursors.add(result.nextCursor) - cursor = result.nextCursor + seen_cursors.add(result.next_cursor) + cursor = result.next_cursor else: raise RuntimeError( f"[{self.name}] Reached auto-pagination limit" @@ -110,19 +115,19 @@ class ClientResourcesMixin: async def list_resource_templates_mcp( self: Client, *, cursor: str | None = None - ) -> mcp.types.ListResourceTemplatesResult: + ) -> mcp_types.ListResourceTemplatesResult: """Send a resources/listResourceTemplates request and return the complete MCP protocol result. Args: cursor: Optional pagination cursor from a previous request's nextCursor. Returns: - mcp.types.ListResourceTemplatesResult: The complete response object from the protocol, + mcp_types.ListResourceTemplatesResult: The complete response object from the protocol, containing the list of resource templates and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ with client_span( "resources/templates/list", @@ -132,15 +137,20 @@ class ClientResourcesMixin: ): logger.debug(f"[{self.name}] called list_resource_templates") + params = ( + mcp_types.PaginatedRequestParams(cursor=cursor) + if cursor is not None + else None + ) result = await self._await_with_session_monitoring( - self.session.list_resource_templates(cursor=cursor) + self.session.list_resource_templates(params=params) ) return result async def list_resource_templates( self: Client, max_pages: int = AUTO_PAGINATION_MAX_PAGES, - ) -> list[mcp.types.ResourceTemplate]: + ) -> list[mcp_types.ResourceTemplate]: """Retrieve all resource templates available on the server. This method automatically fetches all pages if the server paginates results, @@ -152,30 +162,30 @@ class ClientResourcesMixin: max_pages: Maximum number of pages to fetch before raising. Defaults to 250. Returns: - list[mcp.types.ResourceTemplate]: A list of all ResourceTemplate objects. + list[mcp_types.ResourceTemplate]: A list of all ResourceTemplate objects. Raises: RuntimeError: If the page limit is reached before pagination completes. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ - all_templates: list[mcp.types.ResourceTemplate] = [] + all_templates: list[mcp_types.ResourceTemplate] = [] cursor: str | None = None seen_cursors: set[str] = set() for _ in range(max_pages): result = await self.list_resource_templates_mcp(cursor=cursor) - all_templates.extend(result.resourceTemplates) - if not result.nextCursor: + all_templates.extend(result.resource_templates) + if not result.next_cursor: break - if result.nextCursor in seen_cursors: + if result.next_cursor in seen_cursors: logger.warning( f"[{self.name}] Server returned duplicate pagination cursor" - f" {result.nextCursor!r} for list_resource_templates;" + f" {result.next_cursor!r} for list_resource_templates;" " stopping pagination" ) break - seen_cursors.add(result.nextCursor) - cursor = result.nextCursor + seen_cursors.add(result.next_cursor) + cursor = result.next_cursor else: raise RuntimeError( f"[{self.name}] Reached auto-pagination limit" @@ -188,7 +198,7 @@ class ClientResourcesMixin: async def read_resource_mcp( self: Client, uri: AnyUrl | str, meta: dict[str, Any] | None = None - ) -> mcp.types.ReadResourceResult: + ) -> mcp_types.ReadResourceResult: """Send a resources/read request and return the complete MCP protocol result. Args: @@ -196,14 +206,17 @@ class ClientResourcesMixin: meta (dict[str, Any] | None, optional): Request metadata (e.g., for SEP-1686 tasks). Defaults to None. Returns: - mcp.types.ReadResourceResult: The complete response object from the protocol, + mcp_types.ReadResourceResult: The complete response object from the protocol, containing the resource contents and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ - uri_str = str(uri) + # SDK v2: the wire `uri` is a plain string, but resources are stored + # under the AnyUrl-normalized form (e.g. a trailing slash for authority + # URIs), so normalize through AnyUrl to keep server-side lookups aligned. + uri_str = str(AnyUrl(uri)) if isinstance(uri, str) else str(uri) with client_span( "resources/read", "resources/read", @@ -213,32 +226,31 @@ class ClientResourcesMixin: ): logger.debug(f"[{self.name}] called read_resource: {uri}") - if isinstance(uri, str): - uri = AnyUrl(uri) # Ensure AnyUrl - # Inject trace context into meta for propagation to server propagated_meta = inject_trace_context(meta) - request_meta = cast(mcp.types.RequestParams.Meta | None, propagated_meta) + request_meta = cast("mcp_types.RequestParamsMeta | None", propagated_meta) # If meta provided, use send_request for SEP-1686 task support if propagated_meta: - task_dict = propagated_meta.get("modelcontextprotocol.io/task") - request = mcp.types.ReadResourceRequest( - params=mcp.types.ReadResourceRequestParams( - uri=uri, - task=mcp.types.TaskMetadata(**task_dict) if task_dict else None, + # SDK v2: ReadResourceRequestParams has no `task` field, so + # resource reads cannot be submitted as background tasks over the + # wire and always graceful-degrade to immediate execution + # (sdk-feedback #3). The uri is a plain string on the wire. + request = mcp_types.ReadResourceRequest( + params=mcp_types.ReadResourceRequestParams( + uri=uri_str, _meta=request_meta, # type: ignore[unknown-argument] # pydantic alias ) ) result = await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] - result_type=mcp.types.ReadResourceResult, + request=request, # type: ignore[arg-type] + result_type=mcp_types.ReadResourceResult, ) ) else: result = await self._await_with_session_monitoring( - self.session.read_resource(uri) + self.session.read_resource(uri_str) ) return result @@ -250,7 +262,7 @@ class ClientResourcesMixin: version: str | None = None, meta: dict[str, Any] | None = None, task: Literal[False] = False, - ) -> list[mcp.types.TextResourceContents | mcp.types.BlobResourceContents]: ... + ) -> list[mcp_types.TextResourceContents | mcp_types.BlobResourceContents]: ... @overload async def read_resource( @@ -274,7 +286,7 @@ class ClientResourcesMixin: task_id: str | None = None, ttl: int = 60000, ) -> ( - list[mcp.types.TextResourceContents | mcp.types.BlobResourceContents] + list[mcp_types.TextResourceContents | mcp_types.BlobResourceContents] | ResourceTask ): """Read the contents of a resource or resolved template. @@ -288,12 +300,12 @@ class ClientResourcesMixin: ttl (int): Time to keep results available in milliseconds (default 60s). Returns: - list[mcp.types.TextResourceContents | mcp.types.BlobResourceContents] | ResourceTask: + list[mcp_types.TextResourceContents | mcp_types.BlobResourceContents] | ResourceTask: A list of content objects if task=False, or a ResourceTask object if task=True. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ # Merge version into request-level meta (not arguments) request_meta = dict(meta) if meta else {} @@ -339,17 +351,26 @@ class ClientResourcesMixin: ResourceTask: Future-like object for accessing task status and results """ # Per SEP-1686 final spec: client sends only ttl, server generates taskId - # Inject trace context into meta for propagation to server + # Inject trace context into meta for propagation to server. + # SDK v2: request `_meta` is `RequestParamsMeta` (a TypedDict), not + # the old `RequestParams.Meta` nested model. propagated_meta = inject_trace_context(meta) - request_meta = cast(mcp.types.RequestParams.Meta | None, propagated_meta) + request_meta = cast( + "mcp_types.RequestParamsMeta | None", + propagated_meta if propagated_meta else None, + ) - if isinstance(uri, str): - uri = AnyUrl(uri) + # SDK v2: ReadResourceRequestParams.uri is a plain string, but resources + # are stored under the AnyUrl-normalized form, so normalize to match. + uri_str = str(AnyUrl(uri)) if isinstance(uri, str) else str(uri) - request = mcp.types.ReadResourceRequest( - params=mcp.types.ReadResourceRequestParams( - uri=uri, - task=mcp.types.TaskMetadata(ttl=ttl), + # SDK v2: ReadResourceRequestParams has no `task` field, so this request + # cannot carry task metadata over the wire and the server graceful- + # degrades to immediate execution (sdk-feedback #3). `ttl` is retained on + # the public API but has no wire representation here. + request = mcp_types.ReadResourceRequest( + params=mcp_types.ReadResourceRequestParams( + uri=uri_str, _meta=request_meta, # type: ignore[unknown-argument] # pydantic alias ) ) @@ -357,15 +378,15 @@ class ClientResourcesMixin: # Server returns CreateTaskResult (task accepted) or ReadResourceResult (graceful degradation) wrapped_result = await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + request=request, # type: ignore[arg-type] result_type=ResourceTaskResponseUnion, ) ) raw_result = wrapped_result.root - if isinstance(raw_result, mcp.types.CreateTaskResult): + if isinstance(raw_result, mcp_types.CreateTaskResult): # Task was accepted - extract task info from CreateTaskResult - server_task_id = raw_result.task.taskId + server_task_id = raw_result.task.task_id self._submitted_task_ids.add(server_task_id) task_obj = ResourceTask( diff --git a/fastmcp_slim/fastmcp/client/mixins/task_management.py b/fastmcp_slim/fastmcp/client/mixins/task_management.py index 40594bb4a..a011b138a 100644 --- a/fastmcp_slim/fastmcp/client/mixins/task_management.py +++ b/fastmcp_slim/fastmcp/client/mixins/task_management.py @@ -4,17 +4,18 @@ from __future__ import annotations from typing import TYPE_CHECKING, Any -import mcp.types -from mcp import McpError +import mcp_types +from mcp import MCPError +from mcp_types import Result +from pydantic import ConfigDict if TYPE_CHECKING: from fastmcp.client.client import Client -from mcp.types import ( +from mcp_types import ( CancelTaskRequest, CancelTaskRequestParams, GetTaskPayloadRequest, GetTaskPayloadRequestParams, - GetTaskPayloadResult, GetTaskRequest, GetTaskRequestParams, GetTaskResult, @@ -27,6 +28,24 @@ from fastmcp.utilities.logging import get_logger logger = get_logger(__name__) +class _RawTaskPayloadResult(Result): + """Permissive result type for `tasks/result` responses. + + Per the v2 spec, a `tasks/result` payload arrives as extra wire fields whose + shape matches the original request's result type (CallToolResult, + GetPromptResult, ReadResourceResult, ...). `GetTaskPayloadResult` is a bare + `Result` that drops those fields on validation, so this subclass retains them + with `extra="allow"`; callers re-parse the resulting dict into the concrete + result type. + """ + + model_config = ConfigDict( + alias_generator=Result.model_config.get("alias_generator"), + populate_by_name=True, + extra="allow", + ) + + class ClientTaskManagementMixin: """Mixin providing task management methods for Client.""" @@ -43,12 +62,12 @@ class ClientTaskManagementMixin: Raises: RuntimeError: If client not connected - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ - request = GetTaskRequest(params=GetTaskRequestParams(taskId=task_id)) + request = GetTaskRequest(params=GetTaskRequestParams(task_id=task_id)) return await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + request=request, # type: ignore[arg-type] result_type=GetTaskResult, ) ) @@ -67,19 +86,21 @@ class ClientTaskManagementMixin: Raises: RuntimeError: If client not connected, task not found, or task failed - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ request = GetTaskPayloadRequest( - params=GetTaskPayloadRequestParams(taskId=task_id) + params=GetTaskPayloadRequestParams(task_id=task_id) ) # Return raw result - Task classes handle type-specific parsing result = await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] - result_type=GetTaskPayloadResult, + request=request, # type: ignore[arg-type] + result_type=_RawTaskPayloadResult, ) ) - # Return as dict for compatibility with Task class parsing + # Return as dict for compatibility with Task class parsing. The payload + # fields (content, structuredContent, messages, contents, ...) survive + # via the permissive result type's extra="allow". return result.model_dump(exclude_none=True, by_alias=True) async def list_tasks( @@ -104,15 +125,15 @@ class ClientTaskManagementMixin: Raises: RuntimeError: If client not connected - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ # Send protocol request params = PaginatedRequestParams(cursor=cursor, limit=limit) # type: ignore[call-arg] # Optional field in MCP SDK # ty:ignore[unknown-argument] request = ListTasksRequest(params=params) server_response = await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[invalid-argument-type] # ty:ignore[invalid-argument-type] - result_type=mcp.types.ListTasksResult, + request=request, # type: ignore[invalid-argument-type] + result_type=mcp_types.ListTasksResult, ) ) @@ -126,13 +147,13 @@ class ClientTaskManagementMixin: try: status = await self.get_task_status(task_id) tasks.append(status.model_dump(by_alias=True)) - except McpError: + except MCPError: # Task may have expired or been deleted, skip it continue return {"tasks": tasks, "nextCursor": None} - async def cancel_task(self: Client, task_id: str) -> mcp.types.CancelTaskResult: + async def cancel_task(self: Client, task_id: str) -> mcp_types.CancelTaskResult: """Cancel a task, transitioning it to cancelled state. Sends a 'tasks/cancel' MCP protocol request. Task will halt execution @@ -146,12 +167,12 @@ class ClientTaskManagementMixin: Raises: RuntimeError: If task doesn't exist - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ - request = CancelTaskRequest(params=CancelTaskRequestParams(taskId=task_id)) + request = CancelTaskRequest(params=CancelTaskRequestParams(task_id=task_id)) return await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[invalid-argument-type] # ty:ignore[invalid-argument-type] - result_type=mcp.types.CancelTaskResult, + request=request, # type: ignore[invalid-argument-type] + result_type=mcp_types.CancelTaskResult, ) ) diff --git a/fastmcp_slim/fastmcp/client/mixins/tools.py b/fastmcp_slim/fastmcp/client/mixins/tools.py index 8d45a0423..555c9553b 100644 --- a/fastmcp_slim/fastmcp/client/mixins/tools.py +++ b/fastmcp_slim/fastmcp/client/mixins/tools.py @@ -6,7 +6,7 @@ import uuid import weakref from typing import TYPE_CHECKING, Any, Literal, cast, overload -import mcp.types +import mcp_types from opentelemetry.trace import Status, StatusCode from pydantic import RootModel @@ -21,7 +21,7 @@ from fastmcp.exceptions import ToolError from fastmcp.telemetry import inject_trace_context from fastmcp.utilities.json_schema_type import json_schema_to_type from fastmcp.utilities.logging import get_logger -from fastmcp.utilities.timeout import normalize_timeout_to_timedelta +from fastmcp.utilities.timeout import normalize_timeout_to_seconds from fastmcp.utilities.types import get_cached_typeadapter logger = get_logger(__name__) @@ -29,7 +29,7 @@ logger = get_logger(__name__) AUTO_PAGINATION_MAX_PAGES = 250 # Type alias for task response union (SEP-1686 graceful degradation) -ToolTaskResponseUnion = RootModel[mcp.types.CreateTaskResult | mcp.types.CallToolResult] +ToolTaskResponseUnion = RootModel[mcp_types.CreateTaskResult | mcp_types.CallToolResult] class ClientToolsMixin: @@ -39,19 +39,19 @@ class ClientToolsMixin: async def list_tools_mcp( self: Client, *, cursor: str | None = None - ) -> mcp.types.ListToolsResult: + ) -> mcp_types.ListToolsResult: """Send a tools/list request and return the complete MCP protocol result. Args: cursor: Optional pagination cursor from a previous request's nextCursor. Returns: - mcp.types.ListToolsResult: The complete response object from the protocol, + mcp_types.ListToolsResult: The complete response object from the protocol, containing the list of tools and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ with client_span( "tools/list", @@ -61,15 +61,20 @@ class ClientToolsMixin: ): logger.debug(f"[{self.name}] called list_tools") + params = ( + mcp_types.PaginatedRequestParams(cursor=cursor) + if cursor is not None + else None + ) result = await self._await_with_session_monitoring( - self.session.list_tools(cursor=cursor) + self.session.list_tools(params=params) ) return result async def list_tools( self: Client, max_pages: int = AUTO_PAGINATION_MAX_PAGES, - ) -> list[mcp.types.Tool]: + ) -> list[mcp_types.Tool]: """Retrieve all tools available on the server. This method automatically fetches all pages if the server paginates results, @@ -80,29 +85,29 @@ class ClientToolsMixin: max_pages: Maximum number of pages to fetch before raising. Defaults to 250. Returns: - list[mcp.types.Tool]: A list of all Tool objects. + list[mcp_types.Tool]: A list of all Tool objects. Raises: RuntimeError: If the page limit is reached before pagination completes. - McpError: If the request results in a TimeoutError | JSONRPCError + MCPError: If the request results in a TimeoutError | JSONRPCError """ - all_tools: list[mcp.types.Tool] = [] + all_tools: list[mcp_types.Tool] = [] cursor: str | None = None seen_cursors: set[str] = set() for _ in range(max_pages): result = await self.list_tools_mcp(cursor=cursor) all_tools.extend(result.tools) - if not result.nextCursor: + if not result.next_cursor: break - if result.nextCursor in seen_cursors: + if result.next_cursor in seen_cursors: logger.warning( f"[{self.name}] Server returned duplicate pagination cursor" - f" {result.nextCursor!r} for list_tools; stopping pagination" + f" {result.next_cursor!r} for list_tools; stopping pagination" ) break - seen_cursors.add(result.nextCursor) - cursor = result.nextCursor + seen_cursors.add(result.next_cursor) + cursor = result.next_cursor else: raise RuntimeError( f"[{self.name}] Reached auto-pagination limit" @@ -122,7 +127,7 @@ class ClientToolsMixin: progress_handler: ProgressHandler | None = None, timeout: datetime.timedelta | float | int | None = None, meta: dict[str, Any] | None = None, - ) -> mcp.types.CallToolResult: + ) -> mcp_types.CallToolResult: """Send a tools/call request and return the complete MCP protocol result. This method returns the raw CallToolResult object, which includes an isError flag @@ -139,12 +144,12 @@ class ClientToolsMixin: can access this via `context.request_context.meta`. Defaults to None. Returns: - mcp.types.CallToolResult: The complete response object from the protocol, + mcp_types.CallToolResult: The complete response object from the protocol, containing the tool result and any additional metadata. Raises: RuntimeError: If called while the client is not connected. - McpError: If the tool call requests results in a TimeoutError | JSONRPCError + MCPError: If the tool call requests results in a TimeoutError | JSONRPCError """ with client_span( f"tools/call {name}", @@ -155,26 +160,32 @@ class ClientToolsMixin: ) as span: logger.debug(f"[{self.name}] called call_tool: {name}") - # Inject trace context into meta for propagation to server + # Inject trace context into meta for propagation to server. + # SDK v2: request `_meta` is `RequestParamsMeta` (a TypedDict), not + # the old `RequestParams.Meta` nested model. propagated_meta = inject_trace_context(meta) + request_meta = cast( + "mcp_types.RequestParamsMeta | None", + propagated_meta if propagated_meta else None, + ) result = await self._await_with_session_monitoring( self.session.call_tool( name=name, arguments=arguments, - read_timeout_seconds=normalize_timeout_to_timedelta(timeout), + read_timeout_seconds=normalize_timeout_to_seconds(timeout), progress_callback=progress_handler or self._progress_handler, - meta=propagated_meta if propagated_meta else None, + meta=request_meta, ) ) # Reflect tool-level errors on the span so callers see ERROR # status even though the MCP protocol call itself succeeded. - if result.isError and span.is_recording(): + if result.is_error and span.is_recording(): span.set_attribute("error.type", "tool_error") description = "" if result.content and isinstance( - result.content[0], mcp.types.TextContent + result.content[0], mcp_types.TextContent ): description = result.content[0].text span.set_status(Status(StatusCode.ERROR, description)) @@ -184,10 +195,10 @@ class ClientToolsMixin: async def _parse_call_tool_result( self: Client, name: str, - result: mcp.types.CallToolResult, + result: mcp_types.CallToolResult, raise_on_error: bool = False, ) -> CallToolResult: - """Parse an mcp.types.CallToolResult into our CallToolResult dataclass. + """Parse an mcp_types.CallToolResult into our CallToolResult dataclass. Args: name: Tool name (for schema lookup) @@ -281,7 +292,7 @@ class ClientToolsMixin: Raises: ToolError: If the tool call results in an error. - McpError: If the tool call request results in a TimeoutError | JSONRPCError + MCPError: If the tool call request results in a TimeoutError | JSONRPCError RuntimeError: If called while the client is not connected. """ # Merge version into request-level meta (not arguments) @@ -342,14 +353,16 @@ class ClientToolsMixin: # Per SEP-1686 final spec: client sends only ttl, server generates taskId # Inject trace context into meta for propagation to server propagated_meta = inject_trace_context(meta) - request_meta = cast(mcp.types.RequestParams.Meta | None, propagated_meta) + # SDK v2: request `_meta` is `RequestParamsMeta` (a TypedDict), not the + # old `RequestParams.Meta` nested model. + request_meta = cast(mcp_types.RequestParamsMeta | None, propagated_meta) # Build request with task metadata - request = mcp.types.CallToolRequest( - params=mcp.types.CallToolRequestParams( + request = mcp_types.CallToolRequest( + params=mcp_types.CallToolRequestParams( name=name, arguments=arguments or {}, - task=mcp.types.TaskMetadata(ttl=ttl), + task=mcp_types.TaskMetadata(ttl=ttl), _meta=request_meta, # type: ignore[unknown-argument] # pydantic alias ) ) @@ -358,15 +371,15 @@ class ClientToolsMixin: # Use RootModel with Union to handle both response types (SDK calls model_validate) wrapped_result = await self._await_with_session_monitoring( self.session.send_request( - request=request, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + request=request, # type: ignore[arg-type] result_type=ToolTaskResponseUnion, ) ) raw_result = wrapped_result.root - if isinstance(raw_result, mcp.types.CreateTaskResult): + if isinstance(raw_result, mcp_types.CreateTaskResult): # Task was accepted - extract task info from CreateTaskResult - server_task_id = raw_result.task.taskId + server_task_id = raw_result.task.task_id self._submitted_task_ids.add(server_task_id) task_obj = ToolTask( @@ -393,13 +406,13 @@ class ClientToolsMixin: async def _parse_call_tool_result( name: str, - result: mcp.types.CallToolResult, + result: mcp_types.CallToolResult, tool_output_schemas: dict[str, dict[str, Any] | None], list_tools_fn: Any, # Callable[[], Awaitable[None]] client_name: str | None = None, raise_on_error: bool = False, ) -> CallToolResult: - """Parse an mcp.types.CallToolResult into our CallToolResult dataclass. + """Parse an mcp_types.CallToolResult into our CallToolResult dataclass. Args: name: Tool name (for schema lookup) @@ -418,13 +431,13 @@ async def _parse_call_tool_result( from fastmcp.client.client import CallToolResult data = None - if result.isError and raise_on_error: - if result.content and isinstance(result.content[0], mcp.types.TextContent): + if result.is_error and raise_on_error: + if result.content and isinstance(result.content[0], mcp_types.TextContent): msg = result.content[0].text else: msg = f"Tool '{name}' returned an error" raise ToolError(msg) - elif result.structuredContent and not result.isError: + elif result.structured_content and not result.is_error: try: raw_fastmcp_meta = (result.meta or {}).get("fastmcp") fastmcp_meta = ( @@ -441,15 +454,15 @@ async def _parse_call_tool_result( if wrap_from_meta: # Meta tells us the result is wrapped — unwrap and validate. - structured_content = result.structuredContent.get("result") + structured_content = result.structured_content.get("result") elif name in tool_output_schemas: output_schema = tool_output_schemas.get(name) if output_schema and output_schema.get("x-fastmcp-wrap-result"): - structured_content = result.structuredContent.get("result") + structured_content = result.structured_content.get("result") else: - structured_content = result.structuredContent + structured_content = result.structured_content else: - structured_content = result.structuredContent + structured_content = result.structured_content # Type-validate through the schema if available. output_schema = tool_output_schemas.get(name) @@ -470,8 +483,8 @@ async def _parse_call_tool_result( return CallToolResult( content=result.content, - structured_content=result.structuredContent, + structured_content=result.structured_content, meta=result.meta, data=data, - is_error=result.isError, + is_error=result.is_error, ) diff --git a/fastmcp_slim/fastmcp/client/roots.py b/fastmcp_slim/fastmcp/client/roots.py index cdf97938b..cb655c1fb 100644 --- a/fastmcp_slim/fastmcp/client/roots.py +++ b/fastmcp_slim/fastmcp/client/roots.py @@ -2,13 +2,14 @@ import inspect from collections.abc import Awaitable, Callable from typing import TypeAlias, cast -import mcp.types +import mcp_types import pydantic from mcp import ClientSession -from mcp.client.session import ListRootsFnT -from mcp.shared.context import LifespanContextT, RequestContext +from mcp.client.session import ClientRequestContext, ListRootsFnT -RootsList: TypeAlias = list[str] | list[mcp.types.Root] | list[str | mcp.types.Root] +from fastmcp.client._sdk_context_shim import LifespanContextT, RequestContext + +RootsList: TypeAlias = list[str] | list[mcp_types.Root] | list[str | mcp_types.Root] RootsHandler: TypeAlias = ( Callable[[RequestContext[ClientSession, LifespanContextT]], RootsList] @@ -16,15 +17,15 @@ RootsHandler: TypeAlias = ( ) -def convert_roots_list(roots: RootsList) -> list[mcp.types.Root]: +def convert_roots_list(roots: RootsList) -> list[mcp_types.Root]: roots_list = [] for r in roots: - if isinstance(r, mcp.types.Root): + if isinstance(r, mcp_types.Root): roots_list.append(r) elif isinstance(r, pydantic.FileUrl): - roots_list.append(mcp.types.Root(uri=r)) + roots_list.append(mcp_types.Root(uri=r)) elif isinstance(r, str): - roots_list.append(mcp.types.Root(uri=pydantic.FileUrl(r))) + roots_list.append(mcp_types.Root(uri=pydantic.FileUrl(r))) else: raise ValueError(f"Invalid root: {r}") return roots_list @@ -48,9 +49,9 @@ def _create_roots_callback_from_roots( roots = convert_roots_list(roots) async def _roots_callback( - context: RequestContext[ClientSession, LifespanContextT], - ) -> mcp.types.ListRootsResult: - return mcp.types.ListRootsResult(roots=roots) + context: ClientRequestContext, + ) -> mcp_types.ListRootsResult: + return mcp_types.ListRootsResult(roots=roots) return _roots_callback @@ -60,18 +61,21 @@ def _create_roots_callback_from_fn( | Callable[[RequestContext[ClientSession, LifespanContextT]], Awaitable[RootsList]], ) -> ListRootsFnT: async def _roots_callback( - context: RequestContext[ClientSession, LifespanContextT], - ) -> mcp.types.ListRootsResult | mcp.types.ErrorData: + context: ClientRequestContext, + ) -> mcp_types.ListRootsResult | mcp_types.ErrorData: try: - roots = fn(context) + # The public RootsHandler alias is typed against the subscriptable + # RequestContext shim; the runtime object is the SDK's + # ClientRequestContext, passed through opaquely. + roots = fn(context) # ty: ignore[invalid-argument-type] if inspect.isawaitable(roots): roots = await roots - return mcp.types.ListRootsResult( + return mcp_types.ListRootsResult( roots=convert_roots_list(cast(RootsList, roots)) ) except Exception as e: - return mcp.types.ErrorData( - code=mcp.types.INTERNAL_ERROR, + return mcp_types.ErrorData( + code=mcp_types.INTERNAL_ERROR, message=str(e), ) diff --git a/fastmcp_slim/fastmcp/client/sampling/__init__.py b/fastmcp_slim/fastmcp/client/sampling/__init__.py index 40f2f7d10..e35e5c663 100644 --- a/fastmcp_slim/fastmcp/client/sampling/__init__.py +++ b/fastmcp_slim/fastmcp/client/sampling/__init__.py @@ -2,13 +2,13 @@ import inspect from collections.abc import Awaitable, Callable from typing import TypeAlias, TypeVar, cast -import mcp.types +import mcp_types from mcp import ClientSession, CreateMessageResult from mcp.client.session import SamplingFnT from mcp.server.session import ServerSession -from mcp.shared.context import LifespanContextT, RequestContext -from mcp.types import CreateMessageRequestParams as SamplingParams -from mcp.types import CreateMessageResultWithTools, SamplingMessage +from fastmcp.client._sdk_context_shim import LifespanContextT, RequestContext +from mcp_types import CreateMessageRequestParams as SamplingParams +from mcp_types import CreateMessageResultWithTools, SamplingMessage # Result type that handlers can return SamplingHandlerResult: TypeAlias = ( @@ -47,7 +47,7 @@ def create_sampling_callback( async def _sampling_handler( context, params: SamplingParams, - ) -> CreateMessageResult | CreateMessageResultWithTools | mcp.types.ErrorData: + ) -> CreateMessageResult | CreateMessageResultWithTools | mcp_types.ErrorData: try: result = sampling_handler(params.messages, params, context) if inspect.isawaitable(result): @@ -59,12 +59,12 @@ def create_sampling_callback( result = CreateMessageResult( role="assistant", model="fastmcp-slim", - content=mcp.types.TextContent(type="text", text=result), + content=mcp_types.TextContent(type="text", text=result), ) return result except Exception as e: - return mcp.types.ErrorData( - code=mcp.types.INTERNAL_ERROR, + return mcp_types.ErrorData( + code=mcp_types.INTERNAL_ERROR, message=str(e), ) diff --git a/fastmcp_slim/fastmcp/client/sampling/handlers/anthropic.py b/fastmcp_slim/fastmcp/client/sampling/handlers/anthropic.py index b7559ea89..88eb132ee 100644 --- a/fastmcp_slim/fastmcp/client/sampling/handlers/anthropic.py +++ b/fastmcp_slim/fastmcp/client/sampling/handlers/anthropic.py @@ -3,7 +3,7 @@ from collections.abc import Iterator, Sequence from typing import Any -from mcp.types import ( +from mcp_types import ( AudioContent, CreateMessageResult, CreateMessageResultWithTools, @@ -18,7 +18,7 @@ from mcp.types import ( ToolResultContent, ToolUseContent, ) -from mcp.types import CreateMessageRequestParams as SamplingParams +from mcp_types import CreateMessageRequestParams as SamplingParams try: from anthropic import AsyncAnthropic @@ -54,16 +54,16 @@ _ANTHROPIC_IMAGE_MEDIA_TYPES = frozenset( def _image_content_to_anthropic_block(content: ImageContent) -> ImageBlockParam: """Convert MCP ImageContent to Anthropic ImageBlockParam.""" - if content.mimeType not in _ANTHROPIC_IMAGE_MEDIA_TYPES: + if content.mime_type not in _ANTHROPIC_IMAGE_MEDIA_TYPES: raise ValueError( - f"Unsupported image MIME type for Anthropic: {content.mimeType!r}. " + f"Unsupported image MIME type for Anthropic: {content.mime_type!r}. " f"Supported types: {', '.join(sorted(_ANTHROPIC_IMAGE_MEDIA_TYPES))}" ) return ImageBlockParam( type="image", source=Base64ImageSourceParam( type="base64", - media_type=content.mimeType, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + media_type=content.mime_type, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] data=content.data, ), ) @@ -103,7 +103,9 @@ class AnthropicSamplingHandler: messages=messages, ) - model: ModelParam = self._select_model_from_preferences(params.modelPreferences) + model: ModelParam = self._select_model_from_preferences( + params.model_preferences + ) # Convert MCP tools to Anthropic format anthropic_tools: list[ToolParam] | None = None @@ -113,8 +115,8 @@ class AnthropicSamplingHandler: # Convert tool_choice to Anthropic format # Returns None if mode is "none", signaling tools should be omitted anthropic_tool_choice: ToolChoiceParam | None = None - if params.toolChoice: - converted = self._convert_tool_choice_to_anthropic(params.toolChoice) + if params.tool_choice: + converted = self._convert_tool_choice_to_anthropic(params.tool_choice) if converted is None: # tool_choice="none" means don't use tools anthropic_tools = None @@ -126,14 +128,14 @@ class AnthropicSamplingHandler: kwargs: dict[str, Any] = { "model": model, "messages": anthropic_messages, - "max_tokens": params.maxTokens, + "max_tokens": params.max_tokens, } - if params.systemPrompt is not None: - kwargs["system"] = params.systemPrompt + if params.system_prompt is not None: + kwargs["system"] = params.system_prompt if params.temperature is not None: kwargs["temperature"] = params.temperature - if params.stopSequences is not None: - kwargs["stop_sequences"] = params.stopSequences + if params.stop_sequences is not None: + kwargs["stop_sequences"] = params.stop_sequences if anthropic_tools is not None: kwargs["tools"] = anthropic_tools if anthropic_tool_choice is not None: @@ -229,9 +231,9 @@ class AnthropicSamplingHandler: content_blocks.append( ToolResultBlockParam( type="tool_result", - tool_use_id=item.toolUseId, + tool_use_id=item.tool_use_id, content=result_content, - is_error=item.isError if item.isError else False, + is_error=item.is_error if item.is_error else False, ) ) else: @@ -285,9 +287,11 @@ class AnthropicSamplingHandler: content=[ ToolResultBlockParam( type="tool_result", - tool_use_id=content.toolUseId, + tool_use_id=content.tool_use_id, content=result_content_str, - is_error=content.isError if content.isError else False, + is_error=content.is_error + if content.is_error + else False, ) ], ) @@ -364,7 +368,7 @@ class AnthropicSamplingHandler: anthropic_tools: list[ToolParam] = [] for tool in tools: # Build input_schema dict, ensuring required fields - input_schema: dict[str, Any] = dict(tool.inputSchema) + input_schema: dict[str, Any] = dict(tool.input_schema) if "type" not in input_schema: input_schema["type"] = "object" @@ -445,5 +449,5 @@ class AnthropicSamplingHandler: content=content, role="assistant", model=message.model, - stopReason=stop_reason, + stop_reason=stop_reason, ) diff --git a/fastmcp_slim/fastmcp/client/sampling/handlers/google_genai.py b/fastmcp_slim/fastmcp/client/sampling/handlers/google_genai.py index 28301a1b1..d79e98b2f 100644 --- a/fastmcp_slim/fastmcp/client/sampling/handlers/google_genai.py +++ b/fastmcp_slim/fastmcp/client/sampling/handlers/google_genai.py @@ -32,8 +32,7 @@ except ImportError as e: ) from e from mcp import ClientSession, ServerSession -from mcp.shared.context import LifespanContextT, RequestContext -from mcp.types import ( +from mcp_types import ( AudioContent, CreateMessageResult, CreateMessageResultWithTools, @@ -47,8 +46,10 @@ from mcp.types import ( ToolResultContent, ToolUseContent, ) -from mcp.types import CreateMessageRequestParams as SamplingParams -from mcp.types import Tool as MCPTool +from mcp_types import CreateMessageRequestParams as SamplingParams +from mcp_types import Tool as MCPTool + +from fastmcp.client._sdk_context_shim import LifespanContextT, RequestContext __all__ = ["GoogleGenaiSamplingHandler"] @@ -100,10 +101,10 @@ class GoogleGenaiSamplingHandler: google_tools = [ _convert_tool_to_google_genai(tool) for tool in params.tools ] - tool_config = _convert_tool_choice_to_google_genai(params.toolChoice) + tool_config = _convert_tool_choice_to_google_genai(params.tool_choice) # Select the model based on preferences - selected_model = self._get_model(model_preferences=params.modelPreferences) + selected_model = self._get_model(model_preferences=params.model_preferences) # Configure thinking if a budget is specified thinking_config = ( @@ -117,10 +118,10 @@ class GoogleGenaiSamplingHandler: model=selected_model, contents=contents, config=GenerateContentConfig( - system_instruction=params.systemPrompt, + system_instruction=params.system_prompt, temperature=params.temperature, - max_output_tokens=params.maxTokens, - stop_sequences=params.stopSequences, + max_output_tokens=params.max_tokens, + stop_sequences=params.stop_sequences, thinking_config=thinking_config, tools=google_tools, # ty: ignore[invalid-argument-type] tool_config=tool_config, @@ -150,7 +151,7 @@ def _convert_tool_to_google_genai(tool: MCPTool) -> GoogleTool: """ from fastmcp.utilities.json_schema import compress_schema - schema = compress_schema(tool.inputSchema, prune_titles=True) + schema = compress_schema(tool.input_schema, prune_titles=True) return GoogleTool( function_declarations=[ FunctionDeclaration( @@ -207,7 +208,7 @@ def _sampling_content_to_google_genai_part( return Part( inline_data=Blob( data=base64.b64decode(content.data), - mime_type=content.mimeType, + mime_type=content.mime_type, ) ) @@ -215,7 +216,7 @@ def _sampling_content_to_google_genai_part( return Part( inline_data=Blob( data=base64.b64decode(content.data), - mime_type=content.mimeType, + mime_type=content.mime_type, ) ) @@ -249,7 +250,7 @@ def _sampling_content_to_google_genai_part( # Our IDs are formatted as "{function_name}_{uuid8}", so extract the name. # Note: This is a limitation of MCP's ToolResultContent which only carries # toolUseId, while Google's FunctionResponse requires the function name. - tool_use_id = content.toolUseId + tool_use_id = content.tool_use_id if "_" in tool_use_id: # Split and rejoin all but the last part (the UUID suffix) parts = tool_use_id.rsplit("_", 1) @@ -399,5 +400,5 @@ def _response_to_result_with_tools( content=content, role="assistant", model=model, - stopReason=stop_reason, + stop_reason=stop_reason, ) diff --git a/fastmcp_slim/fastmcp/client/sampling/handlers/openai.py b/fastmcp_slim/fastmcp/client/sampling/handlers/openai.py index 3ed34a337..af54ba099 100644 --- a/fastmcp_slim/fastmcp/client/sampling/handlers/openai.py +++ b/fastmcp_slim/fastmcp/client/sampling/handlers/openai.py @@ -5,8 +5,7 @@ from collections.abc import Iterator, Sequence from typing import Any, Literal, get_args from mcp import ClientSession, ServerSession -from mcp.shared.context import LifespanContextT, RequestContext -from mcp.types import ( +from mcp_types import ( AudioContent, CreateMessageResult, CreateMessageResultWithTools, @@ -20,7 +19,9 @@ from mcp.types import ( ToolResultContent, ToolUseContent, ) -from mcp.types import CreateMessageRequestParams as SamplingParams +from mcp_types import CreateMessageRequestParams as SamplingParams + +from fastmcp.client._sdk_context_shim import LifespanContextT, RequestContext try: from openai import AsyncOpenAI @@ -64,12 +65,12 @@ def _image_content_to_openai_part( content: ImageContent, ) -> ChatCompletionContentPartImageParam: """Convert MCP ImageContent to OpenAI image_url content part.""" - if content.mimeType not in _OPENAI_IMAGE_MEDIA_TYPES: + if content.mime_type not in _OPENAI_IMAGE_MEDIA_TYPES: raise ValueError( - f"Unsupported image MIME type for OpenAI: {content.mimeType!r}. " + f"Unsupported image MIME type for OpenAI: {content.mime_type!r}. " f"Supported types: {', '.join(sorted(_OPENAI_IMAGE_MEDIA_TYPES))}" ) - data_url = f"data:{content.mimeType};base64,{content.data}" + data_url = f"data:{content.mime_type};base64,{content.data}" return ChatCompletionContentPartImageParam( type="image_url", image_url={"url": data_url}, @@ -80,10 +81,10 @@ def _audio_content_to_openai_part( content: AudioContent, ) -> ChatCompletionContentPartInputAudioParam: """Convert MCP AudioContent to OpenAI input_audio content part.""" - audio_format = _OPENAI_AUDIO_FORMATS.get(content.mimeType) + audio_format = _OPENAI_AUDIO_FORMATS.get(content.mime_type) if audio_format is None: raise ValueError( - f"Unsupported audio MIME type for OpenAI: {content.mimeType!r}. " + f"Unsupported audio MIME type for OpenAI: {content.mime_type!r}. " f"Supported types: {', '.join(sorted(_OPENAI_AUDIO_FORMATS))}" ) return ChatCompletionContentPartInputAudioParam( @@ -112,12 +113,12 @@ class OpenAISamplingHandler: ) -> CreateMessageResult | CreateMessageResultWithTools: openai_messages: list[ChatCompletionMessageParam] = ( self._convert_to_openai_messages( - system_prompt=params.systemPrompt, + system_prompt=params.system_prompt, messages=messages, ) ) - model: ChatModel = self._select_model_from_preferences(params.modelPreferences) + model: ChatModel = self._select_model_from_preferences(params.model_preferences) # Convert MCP tools to OpenAI format openai_tools: list[ChatCompletionToolParam] | None = None @@ -126,8 +127,8 @@ class OpenAISamplingHandler: # Convert tool_choice to OpenAI format openai_tool_choice: ChatCompletionToolChoiceOptionParam | None = None - if params.toolChoice: - openai_tool_choice = self._convert_tool_choice_to_openai(params.toolChoice) + if params.tool_choice: + openai_tool_choice = self._convert_tool_choice_to_openai(params.tool_choice) # Build kwargs to avoid sentinel type compatibility issues across # openai SDK versions (NotGiven vs Omit) @@ -135,12 +136,12 @@ class OpenAISamplingHandler: "model": model, "messages": openai_messages, } - if params.maxTokens is not None: - kwargs["max_completion_tokens"] = params.maxTokens + if params.max_tokens is not None: + kwargs["max_completion_tokens"] = params.max_tokens if params.temperature is not None: kwargs["temperature"] = params.temperature - if params.stopSequences: - kwargs["stop"] = params.stopSequences + if params.stop_sequences: + kwargs["stop"] = params.stop_sequences if openai_tools is not None: kwargs["tools"] = openai_tools if openai_tool_choice is not None: @@ -240,7 +241,7 @@ class OpenAISamplingHandler: tool_messages.append( ChatCompletionToolMessageParam( role="tool", - tool_call_id=item.toolUseId, + tool_call_id=item.tool_use_id, content=content_text, ) ) @@ -327,7 +328,7 @@ class OpenAISamplingHandler: openai_messages.append( ChatCompletionToolMessageParam( role="tool", - tool_call_id=content.toolUseId, + tool_call_id=content.tool_use_id, content="\n".join(result_texts), ) ) @@ -417,7 +418,7 @@ class OpenAISamplingHandler: openai_tools: list[ChatCompletionToolParam] = [] for tool in tools: # Build parameters dict, ensuring required fields - parameters: dict[str, Any] = dict(tool.inputSchema) + parameters: dict[str, Any] = dict(tool.input_schema) if "type" not in parameters: parameters["type"] = "object" @@ -509,5 +510,5 @@ class OpenAISamplingHandler: content=content, # type: ignore[arg-type] # ty:ignore[invalid-argument-type] role="assistant", model=chat_completion.model, - stopReason=stop_reason, + stop_reason=stop_reason, ) diff --git a/fastmcp_slim/fastmcp/client/tasks.py b/fastmcp_slim/fastmcp/client/tasks.py index 9f1c89ccd..ee3958f16 100644 --- a/fastmcp_slim/fastmcp/client/tasks.py +++ b/fastmcp_slim/fastmcp/client/tasks.py @@ -11,8 +11,8 @@ from collections.abc import Awaitable, Callable from datetime import datetime, timezone from typing import TYPE_CHECKING, Generic, TypeVar -import mcp.types -from mcp.types import GetTaskResult, TaskStatusNotification +import mcp_types +from mcp_types import GetTaskResult, TaskStatusNotification from fastmcp.client.messages import Message, MessageHandler from fastmcp.exceptions import ToolError @@ -33,11 +33,11 @@ class TaskNotificationHandler(MessageHandler): async def dispatch(self, message: Message) -> None: """Dispatch messages, including task status notifications.""" - if isinstance(message, mcp.types.ServerNotification): - if isinstance(message.root, TaskStatusNotification): - client = self._client_ref() - if client: - client._handle_task_status_notification(message.root) + # SDK v2 delivers notifications unwrapped (no `.root` wrapper). + if isinstance(message, TaskStatusNotification): + client = self._client_ref() + if client: + client._handle_task_status_notification(message) await super().dispatch(message) @@ -162,7 +162,7 @@ class Task(abc.ABC, Generic[TaskResultT]): >>> task = await client.call_tool("slow_operation", {}, task=True) >>> >>> def on_update(status: GetTaskResult): - ... print(f"Task {status.taskId} is now {status.status}") + ... print(f"Task {status.task_id} is now {status.status}") >>> >>> task.on_status_change(on_update) >>> result = await task # Callback fires when status changes @@ -178,15 +178,16 @@ class Task(abc.ABC, Generic[TaskResultT]): self._check_client_connected() if self._is_immediate: - # Return synthetic completed status - now = datetime.now(timezone.utc) + # Return synthetic completed status. SDK v2 types the task + # timestamps as ISO 8601 strings. + now = datetime.now(timezone.utc).isoformat() return GetTaskResult( - taskId=self._task_id, + task_id=self._task_id, status="completed", - createdAt=now, - lastUpdatedAt=now, + created_at=now, + last_updated_at=now, ttl=None, - pollInterval=1000, + poll_interval=1000, ) # Return cached status if available (from notification) @@ -370,7 +371,7 @@ class ToolTask(Task["CallToolResult"]): result = self._immediate_result if result.is_error and self._raise_on_error: if result.content and isinstance( - result.content[0], mcp.types.TextContent + result.content[0], mcp_types.TextContent ): msg = result.content[0].text else: @@ -389,13 +390,13 @@ class ToolTask(Task["CallToolResult"]): # Convert to CallToolResult if needed and parse if isinstance(raw_result, dict): # Raw dict from get_task_result - parse as CallToolResult - mcp_result = mcp.types.CallToolResult.model_validate(raw_result) + mcp_result = mcp_types.CallToolResult.model_validate(raw_result) result = await self._client._parse_call_tool_result( self._tool_name, mcp_result, raise_on_error=self._raise_on_error, ) - elif isinstance(raw_result, mcp.types.CallToolResult): + elif isinstance(raw_result, mcp_types.CallToolResult): # Already a CallToolResult from MCP protocol - parse it result = await self._client._parse_call_tool_result( self._tool_name, @@ -407,9 +408,9 @@ class ToolTask(Task["CallToolResult"]): if hasattr(raw_result, "content") and hasattr( raw_result, "structured_content" ): - mcp_result = mcp.types.CallToolResult( + mcp_result = mcp_types.CallToolResult( content=raw_result.content, - structuredContent=raw_result.structured_content, + structured_content=raw_result.structured_content, _meta=raw_result.meta, # type: ignore[call-arg] # _meta is Pydantic alias for meta field ) result = await self._client._parse_call_tool_result( @@ -426,7 +427,7 @@ class ToolTask(Task["CallToolResult"]): return result -class PromptTask(Task[mcp.types.GetPromptResult]): +class PromptTask(Task[mcp_types.GetPromptResult]): """ Represents a prompt call that may execute in background or immediately. @@ -443,7 +444,7 @@ class PromptTask(Task[mcp.types.GetPromptResult]): client: Client, task_id: str, prompt_name: str, - immediate_result: mcp.types.GetPromptResult | None = None, + immediate_result: mcp_types.GetPromptResult | None = None, ): """ Create a PromptTask wrapper. @@ -457,7 +458,7 @@ class PromptTask(Task[mcp.types.GetPromptResult]): super().__init__(client, task_id, immediate_result) self._prompt_name = prompt_name - async def result(self) -> mcp.types.GetPromptResult: + async def result(self) -> mcp_types.GetPromptResult: """Wait for and return the prompt result. If server executed immediately, returns the immediate result. @@ -484,7 +485,7 @@ class PromptTask(Task[mcp.types.GetPromptResult]): mcp_result = await self._client.get_task_result(self._task_id) # Parse as GetPromptResult - result = mcp.types.GetPromptResult.model_validate(mcp_result) + result = mcp_types.GetPromptResult.model_validate(mcp_result) # Cache before returning self._cached_result = result @@ -492,7 +493,7 @@ class PromptTask(Task[mcp.types.GetPromptResult]): class ResourceTask( - Task[list[mcp.types.TextResourceContents | mcp.types.BlobResourceContents]] + Task[list[mcp_types.TextResourceContents | mcp_types.BlobResourceContents]] ): """ Represents a resource read that may execute in background or immediately. @@ -511,7 +512,7 @@ class ResourceTask( task_id: str, uri: str, immediate_result: list[ - mcp.types.TextResourceContents | mcp.types.BlobResourceContents + mcp_types.TextResourceContents | mcp_types.BlobResourceContents ] | None = None, ): @@ -529,7 +530,7 @@ class ResourceTask( async def result( self, - ) -> list[mcp.types.TextResourceContents | mcp.types.BlobResourceContents]: + ) -> list[mcp_types.TextResourceContents | mcp_types.BlobResourceContents]: """Wait for and return the resource contents. If server executed immediately, returns the immediate result. @@ -556,7 +557,7 @@ class ResourceTask( mcp_result = await self._client.get_task_result(self._task_id) # Parse as ReadResourceResult or extract contents - if isinstance(mcp_result, mcp.types.ReadResourceResult): + if isinstance(mcp_result, mcp_types.ReadResourceResult): # Already parsed by TasksResponse - extract contents result = list(mcp_result.contents) elif isinstance(mcp_result, dict) and "contents" in mcp_result: @@ -566,11 +567,11 @@ class ResourceTask( if isinstance(item, dict): if "blob" in item: parsed_contents.append( - mcp.types.BlobResourceContents.model_validate(item) + mcp_types.BlobResourceContents.model_validate(item) ) else: parsed_contents.append( - mcp.types.TextResourceContents.model_validate(item) + mcp_types.TextResourceContents.model_validate(item) ) else: parsed_contents.append(item) diff --git a/fastmcp_slim/fastmcp/client/transports/__init__.py b/fastmcp_slim/fastmcp/client/transports/__init__.py index 5e37c55b2..287697b5c 100644 --- a/fastmcp_slim/fastmcp/client/transports/__init__.py +++ b/fastmcp_slim/fastmcp/client/transports/__init__.py @@ -1,4 +1,4 @@ -from mcp.server.fastmcp import FastMCP as FastMCP1Server +from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.client.transports.base import ( ClientTransport, diff --git a/fastmcp_slim/fastmcp/client/transports/base.py b/fastmcp_slim/fastmcp/client/transports/base.py index fb8047c89..87326413c 100644 --- a/fastmcp_slim/fastmcp/client/transports/base.py +++ b/fastmcp_slim/fastmcp/client/transports/base.py @@ -1,12 +1,12 @@ import abc import contextlib -import datetime -from collections.abc import AsyncIterator -from typing import Literal, TypeVar +from collections.abc import AsyncIterator, Sequence +from typing import Any, Literal, TypeVar import httpx -import mcp.types +import mcp_types from mcp import ClientSession +from mcp.client.extension import NotificationBinding from mcp.client.session import ( ElicitationFnT, ListRootsFnT, @@ -23,14 +23,15 @@ ClientTransportT = TypeVar("ClientTransportT", bound="ClientTransport") class SessionKwargs(TypedDict, total=False): """Keyword arguments for the MCP ClientSession constructor.""" - read_timeout_seconds: datetime.timedelta | None + read_timeout_seconds: float | None sampling_callback: SamplingFnT | None - sampling_capabilities: mcp.types.SamplingCapability | None + sampling_capabilities: mcp_types.SamplingCapability | None list_roots_callback: ListRootsFnT | None logging_callback: LoggingFnT | None elicitation_callback: ElicitationFnT | None message_handler: MessageHandlerFnT | None - client_info: mcp.types.Implementation | None + client_info: mcp_types.Implementation | None + notification_bindings: Sequence[NotificationBinding[Any]] | None class ClientTransport(abc.ABC): diff --git a/fastmcp_slim/fastmcp/client/transports/config.py b/fastmcp_slim/fastmcp/client/transports/config.py index f272c0126..472e94b86 100644 --- a/fastmcp_slim/fastmcp/client/transports/config.py +++ b/fastmcp_slim/fastmcp/client/transports/config.py @@ -1,5 +1,4 @@ import contextlib -import datetime from collections.abc import AsyncIterator from typing import TYPE_CHECKING, Any @@ -147,7 +146,7 @@ class MCPConfigTransport(ClientTransport): self, name: str, config: MCPServerTypes, - timeout: datetime.timedelta | None, + timeout: float | None, stack: contextlib.AsyncExitStack, ) -> tuple[ClientTransport, Any, "FastMCP[Any]"]: """Create underlying transport, proxy client, and proxy server for a single backend. diff --git a/fastmcp_slim/fastmcp/client/transports/http.py b/fastmcp_slim/fastmcp/client/transports/http.py index 280a93d4a..c785955dd 100644 --- a/fastmcp_slim/fastmcp/client/transports/http.py +++ b/fastmcp_slim/fastmcp/client/transports/http.py @@ -5,7 +5,7 @@ from __future__ import annotations import contextlib import datetime import ssl -from collections.abc import AsyncIterator, Callable +from collections.abc import AsyncIterator from typing import Any, Literal, cast import httpx @@ -96,7 +96,22 @@ class StreamableHttpTransport(ClientTransport): self.forward_incoming_headers: bool = False - self._get_session_id_cb: Callable[[], str | None] | None = None + # SDK v2's streamable_http_client no longer exposes a get_session_id + # callback. We recover the session id ourselves by capturing the + # `mcp-session-id` response header via an httpx event hook on the + # client we own (see connect_session / _capture_session_id). + self._session_id: str | None = None + + async def _capture_session_id(self, response: httpx.Response) -> None: + """httpx response event hook: record the server's `mcp-session-id`. + + The streamable HTTP server assigns the session id in the response to + the initialize request and echoes it on subsequent responses; we keep + the latest non-empty value. + """ + sid = response.headers.get("mcp-session-id") + if sid: + self._session_id = sid def _set_auth(self, auth: httpx.Auth | Literal["oauth"] | str | None): resolved: httpx.Auth | None @@ -159,13 +174,12 @@ class StreamableHttpTransport(ClientTransport): else: headers = dict(self.headers) - # Configure timeout if provided, preserving MCP's 30s connect default + # Configure timeout if provided, preserving MCP's 30s connect default. + # SDK v2 session read timeouts are float seconds (see SessionKwargs). timeout: httpx.Timeout | None = None - if session_kwargs.get("read_timeout_seconds") is not None: - read_timeout_seconds = cast( - datetime.timedelta, session_kwargs.get("read_timeout_seconds") - ) - timeout = httpx.Timeout(30.0, read=read_timeout_seconds.total_seconds()) + read_timeout_seconds = session_kwargs.get("read_timeout_seconds") + if read_timeout_seconds is not None: + timeout = httpx.Timeout(30.0, read=read_timeout_seconds) # Create httpx client from factory or use default with MCP-appropriate # timeouts. Note: create_mcp_http_client enables follow_redirects, but @@ -192,29 +206,32 @@ class StreamableHttpTransport(ClientTransport): auth=self.auth, ) - # Ensure httpx client is closed after use + # SDK v2's streamable_http_client no longer surfaces the session id, so + # capture it off the `mcp-session-id` response header on the client we + # own. Register on whichever instance is actually used (factory paths). + self._session_id = None + http_client.event_hooks.setdefault("response", []).append( + self._capture_session_id + ) + + # Ensure httpx client is closed after use. SDK v2 streamable_http_client + # yields a 2-tuple (read, write); get_session_id is gone from the transport. async with ( http_client, - streamable_http_client(self.url, http_client=http_client) as transport, + streamable_http_client(self.url, http_client=http_client) as ( + read_stream, + write_stream, + ), + ClientSession(read_stream, write_stream, **session_kwargs) as session, ): - read_stream, write_stream, get_session_id = transport - self._get_session_id_cb = get_session_id - async with ClientSession( - read_stream, write_stream, **session_kwargs - ) as session: - yield session + yield session def get_session_id(self) -> str | None: - if self._get_session_id_cb: - try: - return self._get_session_id_cb() - except Exception: - return None - return None + return self._session_id async def close(self): - # Reset the session id callback - self._get_session_id_cb = None + # Reset the captured session id + self._session_id = None def __repr__(self) -> str: return f"<StreamableHttpTransport(url='{self.url}')>" diff --git a/fastmcp_slim/fastmcp/client/transports/inference.py b/fastmcp_slim/fastmcp/client/transports/inference.py index a0bd6bc51..84711d198 100644 --- a/fastmcp_slim/fastmcp/client/transports/inference.py +++ b/fastmcp_slim/fastmcp/client/transports/inference.py @@ -1,7 +1,7 @@ from pathlib import Path from typing import TYPE_CHECKING, Any, cast, overload -from mcp.server.fastmcp import FastMCP as FastMCP1Server +from mcp.server.mcpserver import MCPServer as SDKServer from pydantic import AnyUrl from fastmcp.client.transports.base import ClientTransport, ClientTransportT @@ -33,7 +33,7 @@ def infer_transport(transport: FastMCP) -> FastMCPTransport: ... @overload -def infer_transport(transport: FastMCP1Server) -> FastMCPTransport: ... +def infer_transport(transport: SDKServer) -> FastMCPTransport: ... @overload @@ -65,7 +65,7 @@ def infer_transport(transport: Path) -> PythonStdioTransport | NodeStdioTranspor def infer_transport( transport: ClientTransport | FastMCP - | FastMCP1Server + | SDKServer | AnyUrl | Path | MCPConfig @@ -81,7 +81,7 @@ def infer_transport( The function supports these input types: - ClientTransport: Used directly without modification - - FastMCP or FastMCP1Server: Creates an in-memory FastMCPTransport + - FastMCP or SDKServer: Creates an in-memory FastMCPTransport - Path or str (file path): Creates PythonStdioTransport (.py) or NodeStdioTransport (.js) - AnyUrl or str (URL): Creates StreamableHttpTransport (default) or SSETransport (for /sse endpoints) - MCPConfig or dict: Creates MCPConfigTransport, potentially connecting to multiple servers @@ -120,7 +120,7 @@ def infer_transport( # the transport is a FastMCP server (2.x or 1.0) elif _is_fastmcp_server(transport): inferred_transport = FastMCPTransport( - mcp=cast("FastMCP[Any] | FastMCP1Server", transport) + mcp=cast("FastMCP[Any] | SDKServer", transport) ) # the transport is a path to a script @@ -159,7 +159,7 @@ def infer_transport( def _is_fastmcp_server(transport: object) -> bool: - if isinstance(transport, FastMCP1Server): + if isinstance(transport, SDKServer): return True try: diff --git a/fastmcp_slim/fastmcp/client/transports/memory.py b/fastmcp_slim/fastmcp/client/transports/memory.py index 5a52191ed..ad683ef32 100644 --- a/fastmcp_slim/fastmcp/client/transports/memory.py +++ b/fastmcp_slim/fastmcp/client/transports/memory.py @@ -5,7 +5,8 @@ from typing import TYPE_CHECKING, Any import anyio from mcp import ClientSession -from mcp.server.fastmcp import FastMCP as FastMCP1Server +from mcp.server import Server +from mcp.server.mcpserver import MCPServer as SDKServer from mcp.shared.memory import create_client_server_memory_streams from typing_extensions import Unpack @@ -16,23 +17,36 @@ if TYPE_CHECKING: from fastmcp.server.server import FastMCP +def _lowlevel_of(server: "FastMCP[Any] | SDKServer") -> Server: + """Resolve the underlying lowlevel MCP `Server` for either server type. + + The SDK's own high-level `MCPServer` exposes its lowlevel server as + `_lowlevel_server` and its own `run()` is synchronous, so we always drive + the async lowlevel `Server.run` here. FastMCP servers expose the same + lowlevel server as `_mcp_server`. + """ + if isinstance(server, SDKServer): + return server._lowlevel_server + return server._mcp_server + + class FastMCPTransport(ClientTransport): """In-memory transport for FastMCP servers. This transport connects directly to a FastMCP server instance in the same - Python process. It works with both FastMCP 2.x servers and FastMCP 1.0 - servers from the low-level MCP SDK. This is particularly useful for unit - tests or scenarios where client and server run in the same runtime. + Python process. It works with both FastMCP servers and the SDK's own + high-level `MCPServer` from the low-level MCP SDK. This is particularly + useful for unit tests or scenarios where client and server run in the same + runtime. """ - def __init__( - self, mcp: "FastMCP[Any] | FastMCP1Server", raise_exceptions: bool = False - ): + def __init__(self, mcp: "FastMCP[Any] | SDKServer", raise_exceptions: bool = False): """Initialize a FastMCPTransport from a FastMCP server instance.""" - # Accept both FastMCP 2.x and FastMCP 1.0 servers. Both expose a - # ``_mcp_server`` attribute pointing to the underlying MCP server - # implementation, so we can treat them identically. + # Accept both FastMCP 2.x and FastMCP 1.0 servers. Their underlying + # lowlevel MCP ``Server`` lives on different attributes + # (``_mcp_server`` vs ``_lowlevel_server``); ``_lowlevel_of`` resolves + # it uniformly so we can drive the async ``Server.run`` for both. self.server = mcp self.raise_exceptions = raise_exceptions @@ -61,13 +75,14 @@ class FastMCPTransport(ClientTransport): # shutdown to hang for 5 seconds per test because fakeredis # blocking operations hold references that prevent clean # cancellation. + lowlevel = _lowlevel_of(self.server) async with _enter_server_lifespan(server=self.server): # noqa: SIM117 async with anyio.create_task_group() as tg: tg.start_soon( - lambda: self.server._mcp_server.run( + lambda: lowlevel.run( server_read, server_write, - self.server._mcp_server.create_initialization_options(), + lowlevel.create_initialization_options(), raise_exceptions=self.raise_exceptions, ) ) @@ -94,16 +109,16 @@ class FastMCPTransport(ClientTransport): @contextlib.asynccontextmanager async def _enter_server_lifespan( - server: "FastMCP[Any] | FastMCP1Server", + server: "FastMCP[Any] | SDKServer", ) -> AsyncIterator[None]: - """Enters the server's lifespan context for FastMCP servers and does nothing for FastMCP 1 servers.""" + """Enters the server's lifespan context for FastMCP servers and does nothing for the SDK's own high-level servers.""" FastMCP2: type[Any] | None try: FastMCP2 = importlib.import_module("fastmcp.server.server").FastMCP except ImportError: FastMCP2 = None - if FastMCP2 is None and not isinstance(server, FastMCP1Server): + if FastMCP2 is None and not isinstance(server, SDKServer): raise ImportError(_install_hints.full_package("In-memory FastMCP transports")) if FastMCP2 is not None and isinstance(server, FastMCP2): diff --git a/fastmcp_slim/fastmcp/client/transports/sse.py b/fastmcp_slim/fastmcp/client/transports/sse.py index 8c2d7c167..09e7fff5c 100644 --- a/fastmcp_slim/fastmcp/client/transports/sse.py +++ b/fastmcp_slim/fastmcp/client/transports/sse.py @@ -134,11 +134,11 @@ class SSETransport(ClientTransport): # instead we simply leave the kwarg out if it's not provided if self.sse_read_timeout is not None: client_kwargs["sse_read_timeout"] = self.sse_read_timeout.total_seconds() - if session_kwargs.get("read_timeout_seconds") is not None: - read_timeout_seconds = cast( - datetime.timedelta, session_kwargs.get("read_timeout_seconds") - ) - client_kwargs["timeout"] = read_timeout_seconds.total_seconds() + # SDK v2 session read timeouts are float seconds (see SessionKwargs); + # sse_client's `timeout` param is likewise float seconds. + read_timeout_seconds = session_kwargs.get("read_timeout_seconds") + if read_timeout_seconds is not None: + client_kwargs["timeout"] = read_timeout_seconds if self.httpx_client_factory is not None: client_kwargs["httpx_client_factory"] = self.httpx_client_factory diff --git a/fastmcp_slim/fastmcp/client/transports/stdio.py b/fastmcp_slim/fastmcp/client/transports/stdio.py index 6fa979ef0..a0067bfa0 100644 --- a/fastmcp_slim/fastmcp/client/transports/stdio.py +++ b/fastmcp_slim/fastmcp/client/transports/stdio.py @@ -141,22 +141,24 @@ class StdioTransport(ClientTransport): self._ready_event = anyio.Event() def _is_session_dead(self) -> bool: - """Check if the session's underlying streams have been closed. + """Check whether the session's underlying connection has closed. - Checks both the write stream (stdin to subprocess) and the read - stream (stdout from subprocess). On some platforms the write-side - pipe lingers after the process exits, so the read-side check - (which reflects stdout_reader detecting the dead process) is the - more reliable signal. + SDK v2 drives the session through a `JSONRPCDispatcher` rather than + exposing raw read/write streams: when the subprocess exits, the + dispatcher's read loop ends and marks itself closed (or never-running). + Detect that so a keep_alive transport tears the stale session down and + reconnects instead of reusing a dead subprocess. """ if self._session is None: return False - try: - if self._session._write_stream.statistics().open_send_streams == 0: - return True - return self._session._read_stream.statistics().open_send_streams == 0 - except AttributeError: + dispatcher = getattr(self._session, "_dispatcher", None) + if dispatcher is None: return False + # A dispatcher that has closed, or that started running and then + # stopped, indicates the connection is gone. `_running` is False before + # the read loop starts too, so only treat "not running" as dead once the + # dispatcher has been closed. + return bool(getattr(dispatcher, "_closed", False)) async def close(self): await self.disconnect() diff --git a/fastmcp_slim/fastmcp/contrib/bulk_tool_caller/bulk_tool_caller.py b/fastmcp_slim/fastmcp/contrib/bulk_tool_caller/bulk_tool_caller.py index 71ed25482..ab7c20e71 100644 --- a/fastmcp_slim/fastmcp/contrib/bulk_tool_caller/bulk_tool_caller.py +++ b/fastmcp_slim/fastmcp/contrib/bulk_tool_caller/bulk_tool_caller.py @@ -1,6 +1,6 @@ from typing import Any -from mcp.types import CallToolResult, TextContent +from mcp_types import CallToolResult, TextContent from pydantic import BaseModel, Field from fastmcp import FastMCP @@ -43,7 +43,7 @@ class CallToolRequestResult(CallToolResult): return cls( tool=tool, arguments=arguments, - isError=result.isError, + is_error=result.is_error, content=result.content, ) @@ -84,7 +84,7 @@ class BulkToolCaller(MCPMixin): results.append(result) - if result.isError and not continue_on_error: + if result.is_error and not continue_on_error: return results return results @@ -112,7 +112,7 @@ class BulkToolCaller(MCPMixin): results.append(result) - if result.isError and not continue_on_error: + if result.is_error and not continue_on_error: return results return results @@ -128,7 +128,7 @@ class BulkToolCaller(MCPMixin): return CallToolRequestResult( tool=tool, arguments=arguments, - isError=True, + is_error=True, content=[ TextContent( type="text", @@ -146,6 +146,6 @@ class BulkToolCaller(MCPMixin): return CallToolRequestResult( tool=tool, arguments=arguments, - isError=result.isError, + is_error=result.is_error, content=result.content, ) diff --git a/fastmcp_slim/fastmcp/exceptions.py b/fastmcp_slim/fastmcp/exceptions.py index 947d9be13..e3c831ba9 100644 --- a/fastmcp_slim/fastmcp/exceptions.py +++ b/fastmcp_slim/fastmcp/exceptions.py @@ -3,13 +3,20 @@ import logging try: - from mcp import McpError + from mcp import MCPError except ImportError: - class McpError(Exception): # type: ignore[no-redef] + class MCPError(Exception): # type: ignore[no-redef] """Fallback used when MCP dependencies are not installed.""" +# Catch-compatibility alias for the pre-v2 SDK name. `except McpError` must +# catch SDK-raised `MCPError`, so this is a plain alias (a subclass would not +# catch the base). Construction differs in v2 (`MCPError(code=, message=)`); +# see the migration notes. +McpError = MCPError + + class FastMCPDeprecationWarning(DeprecationWarning): """Deprecation warning for FastMCP APIs. diff --git a/fastmcp_slim/fastmcp/experimental/transforms/code_mode.py b/fastmcp_slim/fastmcp/experimental/transforms/code_mode.py index e9ea26b72..59787855d 100644 --- a/fastmcp_slim/fastmcp/experimental/transforms/code_mode.py +++ b/fastmcp_slim/fastmcp/experimental/transforms/code_mode.py @@ -7,7 +7,7 @@ from typing import TYPE_CHECKING, Annotated, Any, Literal, Protocol if TYPE_CHECKING: from pydantic_monty import ResourceLimits -from mcp.types import TextContent +from mcp_types import TextContent from pydantic import Field from fastmcp.exceptions import NotFoundError, ToolError diff --git a/fastmcp_slim/fastmcp/prompts/base.py b/fastmcp_slim/fastmcp/prompts/base.py index 028819318..a34a8bc93 100644 --- a/fastmcp_slim/fastmcp/prompts/base.py +++ b/fastmcp_slim/fastmcp/prompts/base.py @@ -14,9 +14,9 @@ if TYPE_CHECKING: from docket.execution import Execution from fastmcp.prompts.function_prompt import FunctionPrompt -import mcp.types +import mcp_types from mcp import GetPromptResult -from mcp.types import ( +from mcp_types import ( AudioContent, EmbeddedResource, Icon, @@ -24,8 +24,8 @@ from mcp.types import ( PromptMessage, TextContent, ) -from mcp.types import Prompt as SDKPrompt -from mcp.types import PromptArgument as SDKPromptArgument +from mcp_types import Prompt as SDKPrompt +from mcp_types import PromptArgument as SDKPromptArgument from pydantic import Field from pydantic.json_schema import SkipJsonSchema @@ -330,13 +330,13 @@ class Prompt(FastMCPComponent): self, arguments: dict[str, Any] | None, task_meta: TaskMeta, - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def _render( self, arguments: dict[str, Any] | None = None, task_meta: TaskMeta | None = None, - ) -> PromptResult | mcp.types.CreateTaskResult: + ) -> PromptResult | mcp_types.CreateTaskResult: """Server entry point that handles task routing. This allows ANY Prompt subclass to support background execution by setting diff --git a/fastmcp_slim/fastmcp/prompts/function_prompt.py b/fastmcp_slim/fastmcp/prompts/function_prompt.py index 3667ece78..c85203b87 100644 --- a/fastmcp_slim/fastmcp/prompts/function_prompt.py +++ b/fastmcp_slim/fastmcp/prompts/function_prompt.py @@ -21,7 +21,7 @@ from typing import ( ) import pydantic_core -from mcp.types import Icon +from mcp_types import Icon from pydantic.json_schema import SkipJsonSchema import fastmcp diff --git a/fastmcp_slim/fastmcp/resources/base.py b/fastmcp_slim/fastmcp/resources/base.py index 618db0013..358a2080d 100644 --- a/fastmcp_slim/fastmcp/resources/base.py +++ b/fastmcp_slim/fastmcp/resources/base.py @@ -7,7 +7,7 @@ import json from collections.abc import Callable from typing import TYPE_CHECKING, Annotated, Any, ClassVar, overload -import mcp.types +import mcp_types if TYPE_CHECKING: from docket import Docket @@ -17,8 +17,8 @@ if TYPE_CHECKING: import pydantic import pydantic_core -from mcp.types import Annotations, Icon -from mcp.types import Resource as SDKResource +from mcp_types import Annotations, Icon +from mcp_types import Resource as SDKResource from pydantic import ( AnyUrl, ConfigDict, @@ -93,7 +93,7 @@ class ResourceContent(pydantic.BaseModel): def to_mcp_resource_contents( self, uri: AnyUrl | str - ) -> mcp.types.TextResourceContents | mcp.types.BlobResourceContents: + ) -> mcp_types.TextResourceContents | mcp_types.BlobResourceContents: """Convert to MCP resource contents type. Args: @@ -103,17 +103,17 @@ class ResourceContent(pydantic.BaseModel): TextResourceContents for str content, BlobResourceContents for bytes """ if isinstance(self.content, str): - return mcp.types.TextResourceContents( - uri=AnyUrl(uri) if isinstance(uri, str) else uri, + return mcp_types.TextResourceContents( + uri=str(uri), text=self.content, - mimeType=self.mime_type or "text/plain", + mime_type=self.mime_type or "text/plain", _meta=self.meta, # type: ignore[call-arg] # _meta is Pydantic alias for meta field ) else: - return mcp.types.BlobResourceContents( - uri=AnyUrl(uri) if isinstance(uri, str) else uri, + return mcp_types.BlobResourceContents( + uri=str(uri), blob=base64.b64encode(self.content).decode(), - mimeType=self.mime_type or "application/octet-stream", + mime_type=self.mime_type or "application/octet-stream", _meta=self.meta, # type: ignore[call-arg] # _meta is Pydantic alias for meta field ) @@ -199,7 +199,7 @@ class ResourceResult(pydantic.BaseModel): f"contents must be str, bytes, or list[ResourceContent], got {type(contents).__name__}" ) - def to_mcp_result(self, uri: AnyUrl | str) -> mcp.types.ReadResourceResult: + def to_mcp_result(self, uri: AnyUrl | str) -> mcp_types.ReadResourceResult: """Convert to MCP ReadResourceResult. Args: @@ -209,7 +209,7 @@ class ResourceResult(pydantic.BaseModel): MCP ReadResourceResult with converted contents """ mcp_contents = [item.to_mcp_resource_contents(uri) for item in self.contents] - return mcp.types.ReadResourceResult( + return mcp_types.ReadResourceResult( contents=mcp_contents, _meta=self.meta, # type: ignore[call-arg] # _meta is Pydantic alias for meta field ) @@ -366,11 +366,11 @@ class Resource(FastMCPComponent): async def _read(self, task_meta: None = None) -> ResourceResult: ... @overload - async def _read(self, task_meta: TaskMeta) -> mcp.types.CreateTaskResult: ... + async def _read(self, task_meta: TaskMeta) -> mcp_types.CreateTaskResult: ... async def _read( self, task_meta: TaskMeta | None = None - ) -> ResourceResult | mcp.types.CreateTaskResult: + ) -> ResourceResult | mcp_types.CreateTaskResult: """Server entry point that handles task routing. This allows ANY Resource subclass to support background execution by setting @@ -410,9 +410,9 @@ class Resource(FastMCPComponent): return SDKResource( name=overrides.get("name", self.name), - uri=overrides.get("uri", self.uri), + uri=str(overrides.get("uri", self.uri)), description=overrides.get("description", self.description), - mimeType=overrides.get("mimeType", self.mime_type), + mime_type=overrides.get("mimeType", self.mime_type), title=overrides.get("title", self.title), icons=overrides.get("icons", self.icons), annotations=overrides.get("annotations", self.annotations), diff --git a/fastmcp_slim/fastmcp/resources/function_resource.py b/fastmcp_slim/fastmcp/resources/function_resource.py index 64e359434..833bc81d4 100644 --- a/fastmcp_slim/fastmcp/resources/function_resource.py +++ b/fastmcp_slim/fastmcp/resources/function_resource.py @@ -18,7 +18,7 @@ from typing import ( runtime_checkable, ) -from mcp.types import Annotations, Icon +from mcp_types import Annotations, Icon from pydantic import AnyUrl from pydantic.json_schema import SkipJsonSchema diff --git a/fastmcp_slim/fastmcp/resources/template.py b/fastmcp_slim/fastmcp/resources/template.py index 972cb9f4e..7cd7b244e 100644 --- a/fastmcp_slim/fastmcp/resources/template.py +++ b/fastmcp_slim/fastmcp/resources/template.py @@ -9,14 +9,14 @@ from collections.abc import Callable from typing import TYPE_CHECKING, Any, ClassVar, overload from urllib.parse import parse_qs, quote, unquote -import mcp.types -from mcp.types import Annotations, Icon +import mcp_types +from mcp_types import Annotations, Icon from pydantic.json_schema import SkipJsonSchema if TYPE_CHECKING: from docket import Docket from docket.execution import Execution -from mcp.types import ResourceTemplate as SDKResourceTemplate +from mcp_types import ResourceTemplate as SDKResourceTemplate from pydantic import ( Field, field_validator, @@ -264,11 +264,11 @@ class ResourceTemplate(FastMCPComponent): @overload async def _read( self, uri: str, params: dict[str, Any], task_meta: TaskMeta - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def _read( self, uri: str, params: dict[str, Any], task_meta: TaskMeta | None = None - ) -> ResourceResult | mcp.types.CreateTaskResult: + ) -> ResourceResult | mcp_types.CreateTaskResult: """Server entry point that handles task routing. This allows ANY ResourceTemplate subclass to support background execution @@ -323,9 +323,9 @@ class ResourceTemplate(FastMCPComponent): return SDKResourceTemplate( name=overrides.get("name", self.name), - uriTemplate=overrides.get("uriTemplate", self.uri_template), + uri_template=overrides.get("uriTemplate", self.uri_template), description=overrides.get("description", self.description), - mimeType=overrides.get("mimeType", self.mime_type), + mime_type=overrides.get("mimeType", self.mime_type), title=overrides.get("title", self.title), icons=overrides.get("icons", self.icons), annotations=overrides.get("annotations", self.annotations), @@ -340,10 +340,10 @@ class ResourceTemplate(FastMCPComponent): # Note: This creates a simple ResourceTemplate instance. For function-based templates, # the original function is lost, which is expected for remote templates. return cls( - uri_template=mcp_template.uriTemplate, + uri_template=mcp_template.uri_template, name=mcp_template.name, description=mcp_template.description, - mime_type=mcp_template.mimeType or "text/plain", + mime_type=mcp_template.mime_type or "text/plain", parameters={}, # Remote templates don't have local parameters ) @@ -402,11 +402,11 @@ class FunctionResourceTemplate(ResourceTemplate): @overload async def _read( self, uri: str, params: dict[str, Any], task_meta: TaskMeta - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def _read( self, uri: str, params: dict[str, Any], task_meta: TaskMeta | None = None - ) -> ResourceResult | mcp.types.CreateTaskResult: + ) -> ResourceResult | mcp_types.CreateTaskResult: """Optimized server entry point that skips ephemeral resource creation. For FunctionResourceTemplate, we can call read() directly instead of diff --git a/fastmcp_slim/fastmcp/server/auth/oauth_proxy/proxy.py b/fastmcp_slim/fastmcp/server/auth/oauth_proxy/proxy.py index 33eea92cb..603f8ad0e 100644 --- a/fastmcp_slim/fastmcp/server/auth/oauth_proxy/proxy.py +++ b/fastmcp_slim/fastmcp/server/auth/oauth_proxy/proxy.py @@ -947,7 +947,7 @@ class OAuthProxy(OAuthProvider, ConsentMixin): self._resource_url, ) raise AuthorizeError( - error="invalid_target", # type: ignore[arg-type] # ty:ignore[invalid-argument-type] + error="invalid_target", # type: ignore[arg-type] error_description="Resource does not match this server", ) diff --git a/fastmcp_slim/fastmcp/server/context.py b/fastmcp_slim/fastmcp/server/context.py index 604ce301f..3d0709736 100644 --- a/fastmcp_slim/fastmcp/server/context.py +++ b/fastmcp_slim/fastmcp/server/context.py @@ -8,28 +8,27 @@ from contextlib import contextmanager from contextvars import ContextVar, Token from dataclasses import dataclass from logging import Logger -from typing import Any, Literal, overload +from typing import Any, Literal, cast, overload -import mcp.types +import mcp_types from mcp import LoggingLevel, ServerSession -from mcp.server.lowlevel.server import request_ctx -from mcp.shared.context import RequestContext -from mcp.types import ( +from mcp.server.context import ServerRequestContext +from mcp_types import ( GetPromptResult, ModelPreferences, Root, SamplingMessage, ) -from mcp.types import Prompt as SDKPrompt -from mcp.types import Resource as SDKResource +from mcp_types import Prompt as SDKPrompt +from mcp_types import Resource as SDKResource from pydantic.networks import AnyUrl -from starlette.requests import Request from typing_extensions import TypeVar from uncalled_for import SharedContext import fastmcp from fastmcp.exceptions import FastMCPDeprecationWarning from fastmcp.resources.base import ResourceResult +from fastmcp.server.dependencies import FastMCPRequestContext, fastmcp_request_ctx from fastmcp.server.elicitation import ( AcceptedElicitation, CancelledElicitation, @@ -37,7 +36,7 @@ from fastmcp.server.elicitation import ( handle_elicit_accept, parse_elicit_response_type, ) -from fastmcp.server.low_level import MiddlewareServerSession +from fastmcp.server.low_level import client_supports_extension from fastmcp.server.sampling import SampleStep, SamplingResult, SamplingTool from fastmcp.server.sampling.run import ( sample_impl, @@ -322,11 +321,11 @@ class Context: _current_context.reset(token) @property - def request_context(self) -> RequestContext[ServerSession, Any, Request] | None: + def request_context(self) -> FastMCPRequestContext | None: """Access to the underlying request context. Returns None when the MCP session has not been established yet. - Returns the full RequestContext once the MCP session is available. + Returns the FastMCPRequestContext wrapper once the MCP session is available. For HTTP request access in middleware, use `get_http_request()` from fastmcp.server.dependencies, which works whether or not the MCP session is available. @@ -345,10 +344,7 @@ class Context: return await call_next(context) ``` """ - try: - return request_ctx.get() - except LookupError: - return None + return fastmcp_request_ctx.get() @property def lifespan_context(self) -> dict[str, Any]: @@ -400,9 +396,10 @@ class Context: message: Optional status message describing current progress """ + rc = self.request_context progress_token = ( - self.request_context.meta.progressToken - if self.request_context and self.request_context.meta + rc._srctx.meta.get("progress_token") + if rc is not None and rc._srctx.meta is not None else None ) @@ -450,33 +447,38 @@ class Context: async def _paginate_list( self, - request_factory: Callable[[str | None], Any], - call_method: Callable[[Any], Any], + call_handler: Callable[[Any, Any], Any], extract_items: Callable[[Any], list[Any]], ) -> list[Any]: """Generic pagination helper for list operations. + Invokes a FastMCP ``_on_*`` list handler (``(ctx, params) -> result``) + page by page. The SDK request context comes from the active request; + outside a request context a fresh stand-in is used. + Args: - request_factory: Function that creates a request from a cursor - call_method: Async method to call with the request - extract_items: Function to extract items from the result + call_handler: FastMCP list handler taking ``(ctx, params)``. + extract_items: Function to extract items from the result. Returns: List of all items across all pages """ + rc = self.request_context + srctx = rc._srctx if rc is not None else _detached_request_context(self) + all_items: list[Any] = [] cursor: str | None = None seen_cursors: set[str] = set() while True: - request = request_factory(cursor) - result = await call_method(request) + params = mcp_types.PaginatedRequestParams(cursor=cursor) if cursor else None + result = await call_handler(srctx, params) all_items.extend(extract_items(result)) - if not result.nextCursor: + if not result.next_cursor: break - if result.nextCursor in seen_cursors: + if result.next_cursor in seen_cursors: break - seen_cursors.add(result.nextCursor) - cursor = result.nextCursor + seen_cursors.add(result.next_cursor) + cursor = result.next_cursor return all_items async def list_resources(self) -> list[SDKResource]: @@ -486,12 +488,7 @@ class Context: List of Resource objects available on the server """ return await self._paginate_list( - request_factory=lambda cursor: mcp.types.ListResourcesRequest( - params=mcp.types.PaginatedRequestParams(cursor=cursor) - if cursor - else None - ), - call_method=self.fastmcp._list_resources_mcp, + call_handler=self.fastmcp._on_list_resources, extract_items=lambda result: result.resources, ) @@ -502,12 +499,7 @@ class Context: List of Prompt objects available on the server """ return await self._paginate_list( - request_factory=lambda cursor: mcp.types.ListPromptsRequest( - params=mcp.types.PaginatedRequestParams(cursor=cursor) - if cursor - else None - ), - call_method=self.fastmcp._list_prompts_mcp, + call_handler=self.fastmcp._on_list_prompts, extract_items=lambda result: result.prompts, ) @@ -524,7 +516,7 @@ class Context: The prompt result """ result = await self.fastmcp.render_prompt(name, arguments) - if isinstance(result, mcp.types.CreateTaskResult): + if isinstance(result, mcp_types.CreateTaskResult): raise RuntimeError( "Unexpected CreateTaskResult: Context calls should not have task metadata" ) @@ -540,7 +532,7 @@ class Context: ResourceResult with contents """ result = await self.fastmcp.read_resource(str(uri)) - if isinstance(result, mcp.types.CreateTaskResult): + if isinstance(result, mcp_types.CreateTaskResult): raise RuntimeError( "Unexpected CreateTaskResult: Context calls should not have task metadata" ) @@ -567,12 +559,23 @@ class Context: data = LogData(msg=message, extra=extra) related_request_id = self.origin_request_id + # Resolve the client-requested minimum level (set via logging/setLevel), + # keyed by session id, falling back to the server's configured default. + min_level = self.fastmcp.client_log_level + session = self.session + session_min = self.fastmcp._client_log_levels.get( + _log_level_session_key(session) + ) + if session_min is not None: + min_level = session_min + await _log_to_server_and_client( data=data, - session=self.session, + session=session, level=level or "info", logger_name=logger_name, related_request_id=related_request_id, + min_level=min_level, ) @property @@ -590,8 +593,12 @@ class Context: Inspects the ``extensions`` extra field on ``ClientCapabilities`` sent by the client during initialization. - Returns ``False`` when no session is available (e.g., outside a - request context) or when the client did not advertise the extension. + Reads the client's advertised capabilities from the session, which is + available in request mode and in background-task mode (where the + snapshot session preserves the client's initialize params). Returns + ``False`` when no session is available (e.g., a distributed worker with + no live session, or outside any context) or when the client did not + advertise the extension. Example:: @@ -603,21 +610,18 @@ class Context: return "UI-capable client" return "text-only client" """ - rc = self.request_context - if rc is None: + try: + session = self.session + except RuntimeError: return False - session = rc.session - if not isinstance(session, MiddlewareServerSession): - return False - return session.client_supports_extension(extension_id) + return client_supports_extension(session, extension_id) @property def client_id(self) -> str | None: """Get the client ID if available.""" + rc = self.request_context return ( - getattr(self.request_context.meta, "client_id", None) - if self.request_context and self.request_context.meta - else None + rc.meta.get("client_id") if rc is not None and rc.meta is not None else None ) @property @@ -671,23 +675,42 @@ class Context: "This typically means you're outside a request context." ) - # Check for cached session ID - session_id = getattr(session, "_fastmcp_state_prefix", None) - if session_id is not None: - return session_id + # In SDK v2 the ServerSession is constructed fresh per request, so the + # stable per-client identity lives on the underlying Connection, which + # persists for the whole client session. Cache the state prefix on the + # connection (its `session_id` for HTTP, its `state` dict otherwise) so + # session-scoped state survives across tool calls. + connection = getattr(session, "_connection", None) - # For HTTP, try to get from header - if request_ctx is not None: + # Check for a cached prefix on the stable connection (or the session, as + # a fallback for on_initialize where only a raw session is available). + if connection is not None: + cached = connection.state.get("_fastmcp_state_prefix") + if cached is not None: + return cached + session_cached = getattr(session, "_fastmcp_state_prefix", None) + if session_cached is not None: + return session_cached + + # For HTTP, prefer the connection's negotiated session id, then the + # incoming request header. + session_id: str | None = None + if connection is not None: + session_id = connection.session_id + if session_id is None and request_ctx is not None: request = request_ctx.request if request: session_id = request.headers.get("mcp-session-id") - # For STDIO/SSE/in-memory, generate a UUID + # For STDIO/SSE/in-memory, generate a UUID. if session_id is None: session_id = str(uuid4()) - # Cache on session for consistency - session._fastmcp_state_prefix = session_id # type: ignore[attr-defined] # ty:ignore[unresolved-attribute] + # Cache on the stable connection (falling back to the session). + if connection is not None: + connection.state["_fastmcp_state_prefix"] = session_id + else: + session._fastmcp_state_prefix = session_id # type: ignore[attr-defined] # ty:ignore[unresolved-attribute] return session_id @property @@ -783,18 +806,22 @@ class Context: async def list_roots(self) -> list[Root]: """List the roots available to the server, as indicated by the client.""" - result = await self.session.list_roots() + # Deprecated upstream in SDK v2 but deliberately kept per compat directive; + # removed with the multi-round-trip follow-up. + result = await self.session.list_roots() # ty: ignore[deprecated] return result.roots async def send_notification( - self, notification: mcp.types.ServerNotificationType + self, notification: mcp_types.ServerNotification ) -> None: """Send a notification to the client immediately. Args: notification: An MCP notification instance (e.g., ToolListChangedNotification()) """ - await self.session.send_notification(mcp.types.ServerNotification(notification)) + # v2: ServerNotification is a union of concrete notification models; + # ServerSession.send_notification takes an instance directly (no wrapper). + await self.session.send_notification(notification) async def close_sse_stream(self) -> None: """Close the current response stream to trigger client reconnection. @@ -1189,7 +1216,7 @@ class Context: # Standard request mode: use session.elicit directly result = await self.session.elicit( message=message, - requestedSchema=config.schema, + requested_schema=config.schema, related_request_id=self.request_id, ) @@ -1206,7 +1233,7 @@ class Context: self, message: str, schema: dict[str, Any], - ) -> mcp.types.ElicitResult: + ) -> mcp_types.ElicitResult: """Send an elicitation request from a background task (SEP-1686). This method handles elicitation when running in a Docket worker context, @@ -1422,21 +1449,51 @@ _MCP_LEVEL_SEVERITY: dict[LoggingLevel, int] = { } +def _detached_request_context(context: Context) -> ServerRequestContext: + """Build a minimal SDK request context for internal handler invocation. + + Used by ``Context._paginate_list`` when no request context is active (e.g. + introspection outside a live request), so the ``_on_*`` list handlers have a + context to bind. The list handlers only read ``self`` (the FastMCP server) + to enumerate components, so a session-less context is sufficient. + """ + return ServerRequestContext( + session=cast(ServerSession, context._session), + lifespan_context={}, + protocol_version="2025-06-18", + method="internal", + params=None, + request_id=None, + meta=None, + request=None, + ) + + +def _log_level_session_key(session: ServerSession) -> str: + """Derive the per-session key used for logging/setLevel gating. + + v2 constructs sessions per-request, so the stable identity is the + connection session id (stateful HTTP). stdio/in-memory has no session id, + so a sentinel key is used — all such connections share one gate, matching + the single-connection nature of those transports. + """ + connection = getattr(session, "_connection", None) + session_id = getattr(connection, "session_id", None) if connection else None + return session_id if session_id is not None else "__no_session__" + + async def _log_to_server_and_client( data: LogData, session: ServerSession, level: LoggingLevel, logger_name: str | None = None, related_request_id: str | None = None, + min_level: LoggingLevel | None = None, ) -> None: """Log a message to the server and client.""" - from fastmcp.server.low_level import MiddlewareServerSession - - if isinstance(session, MiddlewareServerSession): - min_level = session._minimum_logging_level or session.fastmcp.client_log_level - if min_level is not None: - if _MCP_LEVEL_SEVERITY[level] < _MCP_LEVEL_SEVERITY[min_level]: - return + if min_level is not None: + if _MCP_LEVEL_SEVERITY[level] < _MCP_LEVEL_SEVERITY[min_level]: + return msg_prefix = f"Sending {level.upper()} to client" @@ -1449,7 +1506,9 @@ async def _log_to_server_and_client( extra=data.extra, ) - await session.send_log_message( + # Deprecated upstream in SDK v2 but deliberately kept per compat directive; + # removed with the multi-round-trip follow-up. + await session.send_log_message( # ty: ignore[deprecated] level=level, data=data, logger=logger_name, diff --git a/fastmcp_slim/fastmcp/server/dependencies.py b/fastmcp_slim/fastmcp/server/dependencies.py index 0b8aee795..3e056cb37 100644 --- a/fastmcp_slim/fastmcp/server/dependencies.py +++ b/fastmcp_slim/fastmcp/server/dependencies.py @@ -7,13 +7,13 @@ CurrentWorker) and background task execution require fastmcp[tasks]. from __future__ import annotations -import contextlib import importlib.metadata import inspect import weakref -from collections.abc import AsyncGenerator, Callable -from contextlib import AsyncExitStack, asynccontextmanager +from collections.abc import AsyncGenerator, Callable, Generator, Mapping +from contextlib import AsyncExitStack, asynccontextmanager, contextmanager from contextvars import ContextVar +from dataclasses import dataclass from datetime import datetime, timezone from functools import lru_cache from types import TracebackType @@ -26,7 +26,8 @@ from mcp.server.auth.middleware.bearer_auth import AuthenticatedUser from mcp.server.auth.provider import ( AccessToken as _SDKAccessToken, ) -from mcp.server.lowlevel.server import request_ctx +from mcp.server.context import ServerRequestContext +from mcp.server.session import ServerSession from packaging.version import Version from starlette.requests import Request from uncalled_for import Dependency, get_dependency_parameters @@ -49,6 +50,95 @@ if TYPE_CHECKING: from fastmcp.server.server import FastMCP +@dataclass +class FastMCPRequestContext: + """FastMCP-owned wrapper around the SDK's per-request context. + + The SDK v2 runner hands each handler a fresh ``ServerRequestContext`` as an + argument rather than exposing it through a ContextVar. FastMCP owns this + ContextVar (``fastmcp_request_ctx``) and each request adapter binds a + ``FastMCPRequestContext`` at the top of the handler (and the initialize + middleware binds it too). + + A wrapper rather than the raw context because the SDK's + ``ServerRequestContext.meta`` is a bare ``RequestParamsMeta`` TypedDict that + only carries ``progress_token`` — it does not carry ``_meta.fastmcp`` or the + distributed-trace parent. Those live in the raw params dict under ``_meta``, + which this wrapper lifts once so downstream consumers have a stable surface. + """ + + session: ServerSession + request_id: str | None + meta: dict[str, Any] | None + """The raw ``_meta`` block lifted from the request params, if any.""" + request: Request | None + protocol_version: str + close_sse_stream: Any | None + lifespan_context: Any + _srctx: ServerRequestContext + """Escape hatch to the underlying SDK request context.""" + + +fastmcp_request_ctx: ContextVar[FastMCPRequestContext | None] = ContextVar( + "fastmcp_request_ctx", default=None +) + + +def _lift_meta(ctx: ServerRequestContext) -> dict[str, Any] | None: + """Lift the raw ``_meta`` block from the request params. + + ``ctx.params`` is the raw params mapping (or None); its ``_meta`` key holds + the full metadata block (``fastmcp.version``, traceparent, progressToken, + ...). ``ctx.meta`` (a TypedDict) only carries ``progress_token``, so version + and trace extraction must read from here. + """ + if ctx.params and isinstance(ctx.params, Mapping): + meta = ctx.params.get("_meta") + if isinstance(meta, Mapping): + return dict(meta) + return None + + +@contextmanager +def bind_request_context( + ctx: ServerRequestContext, +) -> Generator[FastMCPRequestContext, None, None]: + """Bind a ``FastMCPRequestContext`` for the duration of a handler. + + Constructs the wrapper from the SDK's per-request context and sets/resets + the ``fastmcp_request_ctx`` ContextVar. Every request adapter and the + initialize middleware enters this so ``Context`` and dependency helpers can + read the active request from the ContextVar. + """ + wrapper = FastMCPRequestContext( + session=ctx.session, + request_id=str(ctx.request_id) if ctx.request_id is not None else None, + meta=_lift_meta(ctx), + request=ctx.request, + protocol_version=ctx.protocol_version, + close_sse_stream=ctx.close_sse_stream, + lifespan_context=ctx.lifespan_context, + _srctx=ctx, + ) + token = fastmcp_request_ctx.set(wrapper) + try: + yield wrapper + finally: + fastmcp_request_ctx.reset(token) + + +def extract_version_spec(meta: dict[str, Any] | None) -> str | None: + """Extract the FastMCP component version from a lifted ``_meta`` block.""" + if not meta: + return None + fastmcp_meta = meta.get("fastmcp") + if isinstance(fastmcp_meta, Mapping): + version = fastmcp_meta.get("version") + if isinstance(version, str): + return version + return None + + __all__ = [ "AccessToken", "CurrentAccessToken", @@ -58,10 +148,14 @@ __all__ = [ "CurrentHeaders", "CurrentRequest", "CurrentWorker", + "FastMCPRequestContext", "Progress", "TaskContextInfo", "TaskContextSnapshot", "TokenClaim", + "bind_request_context", + "extract_version_spec", + "fastmcp_request_ctx", "get_access_token", "get_context", "get_http_headers", @@ -81,7 +175,7 @@ __all__ = [ # Task context lives in fastmcp.server.tasks.context; public symbols are # re-exported here so existing imports from dependencies continue to work. -from fastmcp.server.tasks.context import ( +from fastmcp.server.tasks.context import ( # noqa: E402 TaskContextInfo, TaskContextSnapshot, _recall_snapshot, @@ -365,10 +459,11 @@ def get_http_request() -> Request: In background tasks, returns a synthetic request populated with the snapshotted headers from the originating HTTP request. """ - # Try MCP SDK's request_ctx first (set during normal MCP request handling) + # Try FastMCP's request context first (set during normal MCP request handling) request = None - with contextlib.suppress(LookupError): - request = request_ctx.get().request + fastmcp_ctx = fastmcp_request_ctx.get() + if fastmcp_ctx is not None: + request = fastmcp_ctx.request # Fallback to FastMCP's HTTP context variable # This is needed during `on_initialize` middleware where request_ctx isn't set yet diff --git a/fastmcp_slim/fastmcp/server/event_store.py b/fastmcp_slim/fastmcp/server/event_store.py index 4e6ec81f1..86897aac7 100644 --- a/fastmcp_slim/fastmcp/server/event_store.py +++ b/fastmcp_slim/fastmcp/server/event_store.py @@ -15,13 +15,18 @@ from key_value.aio.protocols import AsyncKeyValue from key_value.aio.stores.memory import MemoryStore from mcp.server.streamable_http import EventCallback, EventId, EventMessage, StreamId from mcp.server.streamable_http import EventStore as SDKEventStore -from mcp.types import JSONRPCMessage +from mcp_types import JSONRPCMessage +from pydantic import TypeAdapter from fastmcp.utilities.logging import get_logger from fastmcp.utilities.types import FastMCPBaseModel logger = get_logger(__name__) +# In the v2 SDK `JSONRPCMessage` is a bare union (no `.model_validate`); use a +# TypeAdapter to validate a stored dict back into the correct member. +_jsonrpc_message_adapter: TypeAdapter[JSONRPCMessage] = TypeAdapter(JSONRPCMessage) + class EventEntry(FastMCPBaseModel): """Stored event entry.""" @@ -161,7 +166,7 @@ class EventStore(SDKEventStore): entry = EventEntry( event_id=event_id, stream_id=stream_id, - message=message.model_dump(mode="json") if message else None, + message=message.model_dump(mode="json", by_alias=True) if message else None, ) await self._event_store.put(key=event_id, value=entry, ttl=self._ttl) @@ -223,7 +228,7 @@ class EventStore(SDKEventStore): for event_id in event_ids[start_idx:]: event = await self._event_store.get(key=event_id) if event and event.message: - msg = JSONRPCMessage.model_validate(event.message) + msg = _jsonrpc_message_adapter.validate_python(event.message) await send_callback(EventMessage(msg, event.event_id)) return stream_id diff --git a/fastmcp_slim/fastmcp/server/http.py b/fastmcp_slim/fastmcp/server/http.py index c659fd85a..b96bcdd5e 100644 --- a/fastmcp_slim/fastmcp/server/http.py +++ b/fastmcp_slim/fastmcp/server/http.py @@ -49,6 +49,7 @@ class FastMCPStreamableHTTPSessionManager(StreamableHTTPSessionManager): stateless: bool = False, security_settings: TransportSecuritySettings | None = None, retry_interval: int | None = None, + session_idle_timeout: float | None = None, ) -> None: self._shared_event_store: EventStore | None = None super().__init__( @@ -58,6 +59,7 @@ class FastMCPStreamableHTTPSessionManager(StreamableHTTPSessionManager): stateless=stateless, security_settings=security_settings, retry_interval=retry_interval, + session_idle_timeout=session_idle_timeout, ) @property @@ -597,6 +599,13 @@ def create_streamable_http_app( retry_interval=retry_interval, json_response=json_response, stateless=stateless_http, + # FastMCP owns DNS-rebinding protection via HostOriginGuardMiddleware, + # which is more expressive and already the documented surface. Always + # disable the SDK's own protection so the two layers don't + # double-block with confusing errors from two allowlists. + security_settings=TransportSecuritySettings( + enable_dns_rebinding_protection=False + ), ) async with ( server._lifespan_manager(), diff --git a/fastmcp_slim/fastmcp/server/low_level.py b/fastmcp_slim/fastmcp/server/low_level.py index 9168cb7b4..3e020db54 100644 --- a/fastmcp_slim/fastmcp/server/low_level.py +++ b/fastmcp_slim/fastmcp/server/low_level.py @@ -1,18 +1,20 @@ from __future__ import annotations import weakref -from collections.abc import Awaitable, Callable -from contextlib import AsyncExitStack +from collections.abc import Iterator, Mapping +from contextlib import contextmanager from typing import TYPE_CHECKING, Any, cast -import anyio -import mcp.types -from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream -from mcp import LoggingLevel, McpError +import mcp_types +from mcp.server.context import ( + CallNext, + HandlerResult, + ServerMiddleware, + ServerRequestContext, +) from mcp.server.lowlevel.server import ( LifespanResultT, NotificationOptions, - RequestT, ) from mcp.server.lowlevel.server import ( Server as _Server, @@ -20,153 +22,195 @@ from mcp.server.lowlevel.server import ( from mcp.server.models import InitializationOptions from mcp.server.session import ServerSession from mcp.server.stdio import stdio_server as stdio_server -from mcp.shared.message import SessionMessage -from mcp.shared.session import RequestResponder -from pydantic import AnyUrl +from mcp.shared.exceptions import MCPError +from pydantic import ValidationError from fastmcp.apps.config import UI_EXTENSION_ID from fastmcp.utilities.logging import get_logger if TYPE_CHECKING: - from fastmcp.server.middleware import CallNext + from fastmcp.server.middleware import CallNext as FastMCPCallNext from fastmcp.server.server import FastMCP logger = get_logger(__name__) -class MiddlewareServerSession(ServerSession): - """ServerSession that routes initialization requests through FastMCP middleware.""" +def client_supports_extension(session: ServerSession, extension_id: str) -> bool: + """Check whether the connected client supports a given MCP extension. - def __init__(self, fastmcp: FastMCP, *args, **kwargs): - super().__init__(*args, **kwargs) - self._fastmcp_ref: weakref.ref[FastMCP] = weakref.ref(fastmcp) - # Task group for subscription tasks (set during session run) - self._subscription_task_group: anyio.TaskGroup | None = None # type: ignore[valid-type] # ty:ignore[invalid-type-form] - # Minimum logging level requested by the client via logging/setLevel - self._minimum_logging_level: LoggingLevel | None = None + Inspects the ``extensions`` capability on ``ClientCapabilities`` sent by the + client during initialization. In v2 the client's initialize params are + reachable via ``session.client_params``. - @property - def fastmcp(self) -> FastMCP: - """Get the FastMCP instance.""" - fastmcp = self._fastmcp_ref() - if fastmcp is None: - raise RuntimeError("FastMCP instance is no longer available") - return fastmcp - - def client_supports_extension(self, extension_id: str) -> bool: - """Check if the connected client supports a given MCP extension. - - Inspects the ``extensions`` extra field on ``ClientCapabilities`` - sent by the client during initialization. - """ - client_params = self._client_params - if client_params is None: - return False - caps = client_params.capabilities - if caps is None: - return False - # ClientCapabilities uses extra="allow" — extensions is an extra field + SDK v2 declares ``extensions`` as a real field on ``ClientCapabilities``, so + a client sending ``ClientCapabilities(extensions={...})`` populates the field + directly. We read that field first and fall back to ``model_extra`` only for + legacy-serialized clients that carried ``extensions`` as an extra key. + """ + client_params = session.client_params + if client_params is None: + return False + caps = client_params.capabilities + if caps is None: + return False + extensions: dict[str, Any] | None = caps.extensions + if extensions is None: + # Legacy fallback: clients that serialized `extensions` as an extra key + # (ClientCapabilities uses extra="allow") rather than the real field. extras = caps.model_extra or {} - extensions: dict[str, Any] | None = extras.get("extensions") - if not extensions: - return False - return extension_id in extensions + extensions = extras.get("extensions") + if not extensions: + return False + return extension_id in extensions - async def _received_request( + +class FastMCPServerMiddleware: + """SDK v2 server middleware that routes ``initialize`` through FastMCP middleware. + + v2 no longer lets FastMCP subclass ``ServerSession`` (the runner constructs + it per request), so the old ``MiddlewareServerSession._received_request`` + override is replaced by a ``ServerMiddleware``. This middleware binds the + FastMCP request-context ContextVar for the whole chain (covering + ``initialize``, where no handler adapter runs) and routes the initialize + request through the FastMCP middleware chain so ``on_initialize`` hooks fire + and can observe the ``InitializeResult`` or veto with ``MCPError``. + """ + + def __init__(self, fastmcp: FastMCP): + self._ref: weakref.ref[FastMCP] = weakref.ref(fastmcp) + + async def __call__( + self, ctx: ServerRequestContext, call_next: CallNext + ) -> HandlerResult: + from fastmcp.server.dependencies import bind_request_context + + fastmcp = self._ref() + with self._apply_shared_context(fastmcp), bind_request_context(ctx): + # Only initialize requests (request_id present) go through FastMCP + # middleware here; every other request already binds the context in + # its own adapter, so we just pass through. + if ctx.method == "initialize" and ctx.request_id is not None: + if fastmcp is not None: + return await self._run_initialize_mw(fastmcp, ctx, call_next) + return await call_next(ctx) + + @contextmanager + def _apply_shared_context(self, fastmcp: FastMCP | None) -> Iterator[None]: + """Re-establish app-scoped SharedContext ContextVars for this request. + + The SDK v2 dispatcher runs handlers in the message sender's context, so + the ``SharedContext`` ContextVars set during the server lifespan are not + visible here. Re-apply the lifespan's captured snapshot so ``Shared()`` + dependencies resolve (and stay shared) across requests. + """ + snapshot = fastmcp._shared_context_snapshot if fastmcp is not None else None + if not snapshot: + yield + return + tokens = [(var, var.set(value)) for var, value in snapshot.items()] + try: + yield + finally: + for var, token in reversed(tokens): + var.reset(token) + + async def _run_initialize_mw( self, - responder: RequestResponder[mcp.types.ClientRequest, mcp.types.ServerResult], - ): - """ - Override the _received_request method to route special requests - through FastMCP middleware. - - Handles initialization requests and SEP-1686 task methods. - """ - import fastmcp.server.context + fastmcp: FastMCP, + ctx: ServerRequestContext, + call_next: CallNext, + ) -> HandlerResult: + from fastmcp.server.context import Context from fastmcp.server.middleware.middleware import MiddlewareContext - if isinstance(responder.request.root, mcp.types.InitializeRequest): - # The MCP SDK's ServerSession._received_request() handles the - # initialize request internally by calling responder.respond() - # to send the InitializeResult directly to the write stream, then - # returning None. This bypasses the middleware return path entirely, - # so middleware would only see the request, never the response. - # - # To expose the response to middleware (e.g., for logging server - # capabilities), we wrap responder.respond() to capture the - # InitializeResult before it's sent, then return it from - # call_original_handler so it flows back through the middleware chain. - captured_response: mcp.types.ServerResult | None = None - original_respond = responder.respond + # Reconstruct the InitializeRequest from the raw params so FastMCP + # middleware `on_initialize` hooks that inspect the message still work. + init_message: mcp_types.InitializeRequest | None = None + try: + params = ctx.params if isinstance(ctx.params, dict) else {} + init_message = mcp_types.InitializeRequest.model_validate( + {"method": "initialize", "params": params}, by_name=False + ) + except ValidationError: + init_message = None - async def capturing_respond( - response: mcp.types.ServerResult, - ) -> None: - nonlocal captured_response - captured_response = response - return await original_respond(response) + # Track the initialize result produced by the SDK chain so a FastMCP + # middleware that raises `MCPError` *after* `call_next` can be + # logged-and-swallowed (the result is already committed) rather than + # producing a duplicate error response — preserving the pre-v2 contract. + captured_result: mcp_types.InitializeResult | None = None + call_next_completed = False - responder.respond = capturing_respond # type: ignore[method-assign] # ty:ignore[invalid-assignment] + async def call_original_handler( + _mw_ctx: MiddlewareContext, + ) -> mcp_types.InitializeResult | None: + # call_next(ctx) runs the rest of the SDK chain, which for + # initialize returns the serialized InitializeResult dict. FastMCP + # middleware `on_initialize` hooks expect a typed InitializeResult, + # so deserialize before handing control back up the FastMCP chain. + # The runner's `_dump_result` re-serializes whatever we return, so a + # returned model round-trips cleanly. + nonlocal captured_result, call_next_completed + raw = await call_next(ctx) + if isinstance(raw, mcp_types.InitializeResult): + captured_result = raw + elif isinstance(raw, Mapping): + captured_result = mcp_types.InitializeResult.model_validate(dict(raw)) + call_next_completed = True + return captured_result if raw is not None else None - async def call_original_handler( - ctx: MiddlewareContext, - ) -> mcp.types.InitializeResult | None: - await super(MiddlewareServerSession, self)._received_request(responder) - if captured_response is not None and isinstance( - captured_response.root, mcp.types.InitializeResult - ): - return captured_response.root - return None - - async with fastmcp.server.context.Context( - fastmcp=self.fastmcp, session=self - ) as fastmcp_ctx: - # Create the middleware context. - mw_context = MiddlewareContext( - message=responder.request.root, - source="client", - type="request", - method="initialize", - fastmcp_context=fastmcp_ctx, + async with Context(fastmcp=fastmcp, session=ctx.session) as fastmcp_ctx: + mw_context = MiddlewareContext( + message=init_message, + source="client", + type="request", + method="initialize", + fastmcp_context=fastmcp_ctx, + ) + try: + return await fastmcp._run_middleware( + mw_context, + cast("FastMCPCallNext[Any, Any]", call_original_handler), ) - - try: - return await self.fastmcp._run_middleware( - mw_context, - cast("CallNext[Any, Any]", call_original_handler), - ) - except McpError as e: - # McpError can be thrown from middleware in `on_initialize` - # send the error to responder. - if not responder._completed: - with responder: - await responder.respond(e.error) - else: - # Don't re-raise: prevents responding to initialize request twice - logger.warning( - "Received McpError but responder is already completed. " - "Cannot send error response as response was already sent.", - exc_info=e, - ) - return None - - # Fall through to default handling (task methods now handled via registered handlers) - return await super()._received_request(responder) + except MCPError: + # A middleware raised after the initialize response was already + # produced: log and return the committed result instead of + # re-raising to avoid responding to initialize twice. If the + # error was raised before `call_next` succeeded, re-raise so the + # dispatcher turns it into the wire error. + if not call_next_completed: + raise + logger.warning( + "MCPError raised by FastMCP middleware after the initialize " + "response was produced; logging and not re-raising to avoid a " + "duplicate response.", + exc_info=True, + ) + return captured_result -class LowLevelServer(_Server[LifespanResultT, RequestT]): +class LowLevelServer(_Server[LifespanResultT]): def __init__(self, fastmcp: FastMCP, *args: Any, **kwargs: Any): super().__init__(*args, **kwargs) # Store a weak reference to FastMCP to avoid circular references self._fastmcp_ref: weakref.ref[FastMCP] = weakref.ref(fastmcp) - # FastMCP servers support notifications for all components + # FastMCP servers support notifications for all components. v2 derives + # capabilities from registered handlers + protocol_version, but legacy + # clients still read NotificationOptions at create_initialization_options + # time, so keep a default here and pass it through. self.notification_options = NotificationOptions( prompts_changed=True, resources_changed=True, tools_changed=True, ) + # Route initialize through FastMCP middleware. Append so the SDK's + # seeded OpenTelemetryMiddleware stays outermost and keeps emitting spans. + self.middleware.append( + cast("ServerMiddleware[LifespanResultT]", FastMCPServerMiddleware(fastmcp)) + ) + @property def fastmcp(self) -> FastMCP: """Get the FastMCP instance.""" @@ -179,7 +223,7 @@ class LowLevelServer(_Server[LifespanResultT, RequestT]): self, notification_options: NotificationOptions | None = None, experimental_capabilities: dict[str, dict[str, Any]] | None = None, - **kwargs: Any, + extensions: dict[str, dict[str, Any]] | None = None, ) -> InitializationOptions: # ensure we use the FastMCP notification options if notification_options is None: @@ -191,166 +235,36 @@ class LowLevelServer(_Server[LifespanResultT, RequestT]): return super().create_initialization_options( notification_options=notification_options, experimental_capabilities=merged or None, - **kwargs, + extensions=extensions, ) def get_capabilities( self, - notification_options: NotificationOptions, - experimental_capabilities: dict[str, dict[str, Any]], - ) -> mcp.types.ServerCapabilities: - """Override to set capabilities.tasks as a first-class field per SEP-1686. + notification_options: NotificationOptions | None = None, + experimental_capabilities: dict[str, dict[str, Any]] | None = None, + extensions: dict[str, dict[str, Any]] | None = None, + *, + protocol_version: str | None = None, + ) -> mcp_types.ServerCapabilities: + """Override to set capabilities.tasks as a first-class field per SEP-1686 + and advertise the MCP Apps UI extension. - This ensures task capabilities appear in capabilities.tasks instead of - capabilities.experimental.tasks, which is required by the MCP spec and - enables proper task detection by clients like VS Code Copilot 1.107+. + ``ServerCapabilities.tasks`` and ``ServerCapabilities.extensions`` are + real declared fields in v2, so we update them directly. """ from fastmcp.server.tasks.capabilities import get_task_capabilities - # Get base capabilities from SDK (pass empty dict for experimental) - # since we'll set tasks as a first-class field instead capabilities = super().get_capabilities( notification_options, - experimental_capabilities or {}, + experimental_capabilities, + extensions, + protocol_version=protocol_version, ) - # Advertise MCP Apps extension support (io.modelcontextprotocol/ui) - # Uses the same extra-field pattern as tasks above - ServerCapabilities - # has extra="allow" so this survives serialization. - # Merge with any existing extensions to avoid clobbering other features. - existing_extensions_value = (capabilities.model_extra or {}).get("extensions") - existing_extensions = ( - existing_extensions_value - if isinstance(existing_extensions_value, dict) - else {} - ) + existing_extensions = capabilities.extensions or {} return capabilities.model_copy( update={ "tasks": get_task_capabilities(), "extensions": {**existing_extensions, UI_EXTENSION_ID: {}}, } ) - - async def run( - self, - read_stream: MemoryObjectReceiveStream[SessionMessage | Exception], - write_stream: MemoryObjectSendStream[SessionMessage], - initialization_options: InitializationOptions, - raise_exceptions: bool = False, - stateless: bool = False, - ): - """ - Overrides the run method to use the MiddlewareServerSession. - """ - async with AsyncExitStack() as stack: - lifespan_context = await stack.enter_async_context(self.lifespan(self)) - session = await stack.enter_async_context( - MiddlewareServerSession( - self.fastmcp, - read_stream, - write_stream, - initialization_options, - stateless=stateless, - ) - ) - - async with anyio.create_task_group() as tg: - # Store task group on session for subscription tasks (SEP-1686) - session._subscription_task_group = tg - - async for message in session.incoming_messages: - tg.start_soon( - self._handle_message, - message, - session, - lifespan_context, - raise_exceptions, - ) - - def read_resource( - self, - ) -> Callable[ - [ - Callable[ - [AnyUrl], - Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult], - ] - ], - Callable[ - [AnyUrl], - Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult], - ], - ]: - """ - Decorator for registering a read_resource handler with CreateTaskResult support. - - The MCP SDK's read_resource decorator does not support returning CreateTaskResult - for background task execution. This decorator wraps the result in ServerResult. - - This decorator can be removed once the MCP SDK adds native CreateTaskResult support - for resources. - """ - - def decorator( - func: Callable[ - [AnyUrl], - Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult], - ], - ) -> Callable[ - [AnyUrl], - Awaitable[mcp.types.ReadResourceResult | mcp.types.CreateTaskResult], - ]: - async def handler( - req: mcp.types.ReadResourceRequest, - ) -> mcp.types.ServerResult: - result = await func(req.params.uri) - return mcp.types.ServerResult(result) - - self.request_handlers[mcp.types.ReadResourceRequest] = handler - return func - - return decorator - - def get_prompt( - self, - ) -> Callable[ - [ - Callable[ - [str, dict[str, Any] | None], - Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult], - ] - ], - Callable[ - [str, dict[str, Any] | None], - Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult], - ], - ]: - """ - Decorator for registering a get_prompt handler with CreateTaskResult support. - - The MCP SDK's get_prompt decorator does not support returning CreateTaskResult - for background task execution. This decorator wraps the result in ServerResult. - - This decorator can be removed once the MCP SDK adds native CreateTaskResult support - for prompts. - """ - - def decorator( - func: Callable[ - [str, dict[str, Any] | None], - Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult], - ], - ) -> Callable[ - [str, dict[str, Any] | None], - Awaitable[mcp.types.GetPromptResult | mcp.types.CreateTaskResult], - ]: - async def handler( - req: mcp.types.GetPromptRequest, - ) -> mcp.types.ServerResult: - result = await func(req.params.name, req.params.arguments) - return mcp.types.ServerResult(result) - - self.request_handlers[mcp.types.GetPromptRequest] = handler - return func - - return decorator diff --git a/fastmcp_slim/fastmcp/server/middleware/authorization.py b/fastmcp_slim/fastmcp/server/middleware/authorization.py index bb1aaa36c..2040778e3 100644 --- a/fastmcp_slim/fastmcp/server/middleware/authorization.py +++ b/fastmcp_slim/fastmcp/server/middleware/authorization.py @@ -24,9 +24,10 @@ Example: from __future__ import annotations import logging -from collections.abc import Sequence +from collections.abc import Mapping, Sequence +from typing import Any -import mcp.types as mt +import mcp_types as mt from fastmcp.exceptions import AuthorizationError from fastmcp.prompts.base import Prompt, PromptResult @@ -49,12 +50,13 @@ from fastmcp.utilities.versions import VersionSpec logger = logging.getLogger(__name__) -def _requested_version(meta: mt.RequestParams.Meta | None) -> VersionSpec | None: - if meta is None: +def _requested_version(meta: Mapping[str, Any] | None) -> VersionSpec | None: + # SDK v2: request `_meta` is a plain dict (the `Meta` type alias), not the + # old `RequestParams.Meta` nested model. + if not meta: return None - meta_dict = meta.model_dump(exclude_none=True) - fastmcp_meta = meta_dict.get("fastmcp") + fastmcp_meta = meta.get("fastmcp") if not isinstance(fastmcp_meta, dict): return None diff --git a/fastmcp_slim/fastmcp/server/middleware/caching.py b/fastmcp_slim/fastmcp/server/middleware/caching.py index 3a66cfca3..0a38a4f9a 100644 --- a/fastmcp_slim/fastmcp/server/middleware/caching.py +++ b/fastmcp_slim/fastmcp/server/middleware/caching.py @@ -5,7 +5,7 @@ from collections.abc import Sequence from logging import Logger from typing import Any, TypedDict -import mcp.types +import mcp_types import pydantic_core from key_value.aio.adapters.pydantic import PydanticAdapter from key_value.aio.protocols.key_value import AsyncKeyValue @@ -79,7 +79,7 @@ class CachableResourceResult(FastMCPBaseModel): class CachableToolResult(FastMCPBaseModel): - content: list[mcp.types.ContentBlock] + content: list[mcp_types.ContentBlock] structured_content: dict[str, Any] | None meta: dict[str, Any] | None is_error: bool = False @@ -107,10 +107,10 @@ class CachableMessage(FastMCPBaseModel): role: str content: ( - mcp.types.TextContent - | mcp.types.ImageContent - | mcp.types.AudioContent - | mcp.types.EmbeddedResource + mcp_types.TextContent + | mcp_types.ImageContent + | mcp_types.AudioContent + | mcp_types.EmbeddedResource ) @@ -298,8 +298,8 @@ class ResponseCachingMiddleware(Middleware): @override async def on_list_tools( self, - context: MiddlewareContext[mcp.types.ListToolsRequest], - call_next: CallNext[mcp.types.ListToolsRequest, Sequence[Tool]], + context: MiddlewareContext[mcp_types.ListToolsRequest], + call_next: CallNext[mcp_types.ListToolsRequest, Sequence[Tool]], ) -> Sequence[Tool]: """List tools from the cache, if caching is enabled, and the result is in the cache. Otherwise, otherwise call the next middleware and store the result in the cache if caching is enabled.""" @@ -339,8 +339,8 @@ class ResponseCachingMiddleware(Middleware): @override async def on_list_resources( self, - context: MiddlewareContext[mcp.types.ListResourcesRequest], - call_next: CallNext[mcp.types.ListResourcesRequest, Sequence[Resource]], + context: MiddlewareContext[mcp_types.ListResourcesRequest], + call_next: CallNext[mcp_types.ListResourcesRequest, Sequence[Resource]], ) -> Sequence[Resource]: """List resources from the cache, if caching is enabled, and the result is in the cache. Otherwise, otherwise call the next middleware and store the result in the cache if caching is enabled.""" @@ -380,8 +380,8 @@ class ResponseCachingMiddleware(Middleware): @override async def on_list_prompts( self, - context: MiddlewareContext[mcp.types.ListPromptsRequest], - call_next: CallNext[mcp.types.ListPromptsRequest, Sequence[Prompt]], + context: MiddlewareContext[mcp_types.ListPromptsRequest], + call_next: CallNext[mcp_types.ListPromptsRequest, Sequence[Prompt]], ) -> Sequence[Prompt]: """List prompts from the cache, if caching is enabled, and the result is in the cache. Otherwise, otherwise call the next middleware and store the result in the cache if caching is enabled.""" @@ -419,8 +419,8 @@ class ResponseCachingMiddleware(Middleware): @override async def on_call_tool( self, - context: MiddlewareContext[mcp.types.CallToolRequestParams], - call_next: CallNext[mcp.types.CallToolRequestParams, ToolResult], + context: MiddlewareContext[mcp_types.CallToolRequestParams], + call_next: CallNext[mcp_types.CallToolRequestParams, ToolResult], ) -> ToolResult: """Call a tool from the cache, if caching is enabled, and the result is in the cache. Otherwise, otherwise call the next middleware and store the result in the cache if caching is enabled.""" @@ -454,8 +454,8 @@ class ResponseCachingMiddleware(Middleware): @override async def on_read_resource( self, - context: MiddlewareContext[mcp.types.ReadResourceRequestParams], - call_next: CallNext[mcp.types.ReadResourceRequestParams, ResourceResult], + context: MiddlewareContext[mcp_types.ReadResourceRequestParams], + call_next: CallNext[mcp_types.ReadResourceRequestParams, ResourceResult], ) -> ResourceResult: """Read a resource from the cache, if caching is enabled, and the result is in the cache. Otherwise, otherwise call the next middleware and store the result in the cache if caching is enabled.""" @@ -484,8 +484,8 @@ class ResponseCachingMiddleware(Middleware): @override async def on_get_prompt( self, - context: MiddlewareContext[mcp.types.GetPromptRequestParams], - call_next: CallNext[mcp.types.GetPromptRequestParams, PromptResult], + context: MiddlewareContext[mcp_types.GetPromptRequestParams], + call_next: CallNext[mcp_types.GetPromptRequestParams, PromptResult], ) -> PromptResult: """Get a prompt from the cache, if caching is enabled, and the result is in the cache. Otherwise, otherwise call the next middleware and store the result in the cache if caching is enabled.""" @@ -570,7 +570,7 @@ def _get_auth_partition_key() -> str: def _make_call_tool_cache_key( - msg: mcp.types.CallToolRequestParams, auth_key: str = ANONYMOUS_AUTH_KEY + msg: mcp_types.CallToolRequestParams, auth_key: str = ANONYMOUS_AUTH_KEY ) -> str: """Make a cache key for a tool call using a stable hash of name and arguments.""" @@ -578,7 +578,7 @@ def _make_call_tool_cache_key( def _make_read_resource_cache_key( - msg: mcp.types.ReadResourceRequestParams, auth_key: str = ANONYMOUS_AUTH_KEY + msg: mcp_types.ReadResourceRequestParams, auth_key: str = ANONYMOUS_AUTH_KEY ) -> str: """Make a cache key for a resource read using a stable hash of URI.""" @@ -586,7 +586,7 @@ def _make_read_resource_cache_key( def _make_get_prompt_cache_key( - msg: mcp.types.GetPromptRequestParams, auth_key: str = ANONYMOUS_AUTH_KEY + msg: mcp_types.GetPromptRequestParams, auth_key: str = ANONYMOUS_AUTH_KEY ) -> str: """Make a cache key for a prompt get using a stable hash of name and arguments.""" diff --git a/fastmcp_slim/fastmcp/server/middleware/dereference.py b/fastmcp_slim/fastmcp/server/middleware/dereference.py index 0c27585bc..9a551ddfd 100644 --- a/fastmcp_slim/fastmcp/server/middleware/dereference.py +++ b/fastmcp_slim/fastmcp/server/middleware/dereference.py @@ -3,7 +3,7 @@ from collections.abc import Sequence from typing import Any -import mcp.types as mt +import mcp_types as mt from typing_extensions import override from fastmcp.resources.template import ResourceTemplate diff --git a/fastmcp_slim/fastmcp/server/middleware/error_handling.py b/fastmcp_slim/fastmcp/server/middleware/error_handling.py index 81a13bb84..449ee28f4 100644 --- a/fastmcp_slim/fastmcp/server/middleware/error_handling.py +++ b/fastmcp_slim/fastmcp/server/middleware/error_handling.py @@ -7,8 +7,7 @@ from collections.abc import Callable from typing import Any import anyio -from mcp import McpError -from mcp.types import ErrorData +from mcp import MCPError from fastmcp.exceptions import NotFoundError @@ -47,7 +46,7 @@ class ErrorHandlingMiddleware(Middleware): logger: Logger instance for error logging. If None, uses 'fastmcp.errors' include_traceback: Whether to include full traceback in error logs error_callback: Optional callback function called for each error - transform_errors: Whether to transform non-MCP errors to McpError + transform_errors: Whether to transform non-MCP errors to MCPError """ self.logger = logger or logging.getLogger("fastmcp.errors") self.include_traceback = include_traceback @@ -82,7 +81,7 @@ class ErrorHandlingMiddleware(Middleware): self, error: Exception, context: MiddlewareContext ) -> Exception: """Transform non-MCP errors to proper MCP errors.""" - if isinstance(error, McpError): + if isinstance(error, MCPError): return error if not self.transform_errors: @@ -92,30 +91,20 @@ class ErrorHandlingMiddleware(Middleware): error_type = type(error.__cause__) if error.__cause__ else type(error) if error_type in (ValueError, TypeError): - return McpError( - ErrorData(code=-32602, message=f"Invalid params: {error!s}") - ) + return MCPError(code=-32602, message=f"Invalid params: {error!s}") elif error_type in (FileNotFoundError, KeyError, NotFoundError): # MCP spec defines -32002 specifically for resource not found method = context.method or "" if method.startswith("resources/"): - return McpError( - ErrorData(code=-32002, message=f"Resource not found: {error!s}") - ) - return McpError(ErrorData(code=-32001, message=f"Not found: {error!s}")) + return MCPError(code=-32002, message=f"Resource not found: {error!s}") + return MCPError(code=-32001, message=f"Not found: {error!s}") elif error_type is PermissionError: - return McpError( - ErrorData(code=-32000, message=f"Permission denied: {error!s}") - ) + return MCPError(code=-32000, message=f"Permission denied: {error!s}") # asyncio.TimeoutError is a subclass of TimeoutError in Python 3.10, alias in 3.11+ elif error_type in (TimeoutError, asyncio.TimeoutError): - return McpError( - ErrorData(code=-32000, message=f"Request timeout: {error!s}") - ) + return MCPError(code=-32000, message=f"Request timeout: {error!s}") else: - return McpError( - ErrorData(code=-32603, message=f"Internal error: {error!s}") - ) + return MCPError(code=-32603, message=f"Internal error: {error!s}") async def on_message(self, context: MiddlewareContext, call_next: CallNext) -> Any: """Handle errors for all messages.""" diff --git a/fastmcp_slim/fastmcp/server/middleware/middleware.py b/fastmcp_slim/fastmcp/server/middleware/middleware.py index 2786d6835..d2bada05e 100644 --- a/fastmcp_slim/fastmcp/server/middleware/middleware.py +++ b/fastmcp_slim/fastmcp/server/middleware/middleware.py @@ -13,7 +13,7 @@ from typing import ( runtime_checkable, ) -import mcp.types as mt +import mcp_types as mt from typing_extensions import TypeVar from fastmcp.prompts.base import Prompt, PromptResult diff --git a/fastmcp_slim/fastmcp/server/middleware/ping.py b/fastmcp_slim/fastmcp/server/middleware/ping.py index 0fa3966fb..e81ccc377 100644 --- a/fastmcp_slim/fastmcp/server/middleware/ping.py +++ b/fastmcp_slim/fastmcp/server/middleware/ping.py @@ -1,5 +1,7 @@ """Ping middleware for keeping client connections alive.""" +import asyncio +import contextlib from typing import Any import anyio @@ -40,7 +42,7 @@ class PingMiddleware(Middleware): self._lock = anyio.Lock() async def on_message(self, context: MiddlewareContext, call_next: CallNext) -> Any: - """Start ping task on first message from a session.""" + """Start ping task on first message from a connection.""" if ( context.fastmcp_context is None or context.fastmcp_context.request_context is None @@ -48,26 +50,40 @@ class PingMiddleware(Middleware): return await call_next(context) session = context.fastmcp_context.session - session_id = id(session) + # SDK v2 constructs a ServerSession per request; the stable per-connection + # identity lives on the underlying Connection. Key the keepalive loop off + # it so one ping task runs for the whole connection and is torn down when + # the connection closes. + connection = getattr(session, "_connection", None) + connection_id = id(connection) if connection is not None else id(session) async with self._lock: - if session_id not in self._active_sessions: - # _subscription_task_group is added by MiddlewareServerSession - tg = session._subscription_task_group # type: ignore[attr-defined] # ty:ignore[unresolved-attribute] - if tg is not None: - self._active_sessions.add(session_id) - tg.start_soon(self._ping_loop, session, session_id) + if connection_id not in self._active_sessions: + self._active_sessions.add(connection_id) + ping_task = asyncio.create_task( + self._ping_loop(session, connection_id), + name=f"ping-keepalive-{connection_id}", + ) + + if connection is not None: + + async def _cancel_ping() -> None: + ping_task.cancel() + with contextlib.suppress(asyncio.CancelledError): + await ping_task + + connection.exit_stack.push_async_callback(_cancel_ping) return await call_next(context) - async def _ping_loop(self, session: Any, session_id: int) -> None: - """Send periodic pings until session ends.""" + async def _ping_loop(self, session: Any, connection_id: int) -> None: + """Send periodic pings until the connection ends.""" try: while True: await anyio.sleep(self.interval_ms / 1000) try: await session.send_ping() - except anyio.ClosedResourceError: + except (anyio.ClosedResourceError, anyio.BrokenResourceError): return finally: - self._active_sessions.discard(session_id) + self._active_sessions.discard(connection_id) diff --git a/fastmcp_slim/fastmcp/server/middleware/rate_limiting.py b/fastmcp_slim/fastmcp/server/middleware/rate_limiting.py index e34202521..a18ebbd48 100644 --- a/fastmcp_slim/fastmcp/server/middleware/rate_limiting.py +++ b/fastmcp_slim/fastmcp/server/middleware/rate_limiting.py @@ -7,17 +7,16 @@ from collections.abc import Awaitable, Callable from typing import Any, cast import anyio -from mcp import McpError -from mcp.types import ErrorData +from mcp import MCPError from .middleware import CallNext, Middleware, MiddlewareContext -class RateLimitError(McpError): +class RateLimitError(MCPError): """Error raised when rate limit is exceeded.""" def __init__(self, message: str = "Rate limit exceeded"): - super().__init__(ErrorData(code=-32000, message=message)) + super().__init__(code=-32000, message=message) class TokenBucketRateLimiter: diff --git a/fastmcp_slim/fastmcp/server/middleware/response_limiting.py b/fastmcp_slim/fastmcp/server/middleware/response_limiting.py index 24e1cbc12..32f08c056 100644 --- a/fastmcp_slim/fastmcp/server/middleware/response_limiting.py +++ b/fastmcp_slim/fastmcp/server/middleware/response_limiting.py @@ -5,9 +5,9 @@ from __future__ import annotations import logging from typing import Any -import mcp.types as mt +import mcp_types as mt import pydantic_core -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp.tools.base import ToolResult diff --git a/fastmcp_slim/fastmcp/server/middleware/tool_injection.py b/fastmcp_slim/fastmcp/server/middleware/tool_injection.py index 7dfd59694..00a9c3a65 100644 --- a/fastmcp_slim/fastmcp/server/middleware/tool_injection.py +++ b/fastmcp_slim/fastmcp/server/middleware/tool_injection.py @@ -5,8 +5,8 @@ from collections.abc import Sequence from logging import Logger from typing import Annotated, Any -import mcp.types -from mcp.types import Prompt +import mcp_types +from mcp_types import Prompt from pydantic import AnyUrl from typing_extensions import override @@ -34,8 +34,8 @@ class ToolInjectionMiddleware(Middleware): @override async def on_list_tools( self, - context: MiddlewareContext[mcp.types.ListToolsRequest], - call_next: CallNext[mcp.types.ListToolsRequest, Sequence[Tool]], + context: MiddlewareContext[mcp_types.ListToolsRequest], + call_next: CallNext[mcp_types.ListToolsRequest, Sequence[Tool]], ) -> Sequence[Tool]: """Inject tools into the response.""" return [*self._tools_to_inject, *await call_next(context)] @@ -43,8 +43,8 @@ class ToolInjectionMiddleware(Middleware): @override async def on_call_tool( self, - context: MiddlewareContext[mcp.types.CallToolRequestParams], - call_next: CallNext[mcp.types.CallToolRequestParams, ToolResult], + context: MiddlewareContext[mcp_types.CallToolRequestParams], + call_next: CallNext[mcp_types.CallToolRequestParams, ToolResult], ) -> ToolResult: """Intercept tool calls to injected tools.""" if context.message.name in self._tools_to_inject_by_name: @@ -70,7 +70,7 @@ async def get_prompt( arguments: Annotated[ dict[str, Any] | None, "The arguments to pass to the prompt." ] = None, -) -> mcp.types.GetPromptResult: +) -> mcp_types.GetPromptResult: """Render a prompt available on the server.""" return await context.get_prompt(name=name, arguments=arguments) @@ -99,7 +99,7 @@ class PromptToolMiddleware(ToolInjectionMiddleware): super().__init__(tools=tools) -async def list_resources(context: Context) -> list[mcp.types.Resource]: +async def list_resources(context: Context) -> list[mcp_types.Resource]: """List resources available on the server.""" return await context.list_resources() @@ -111,9 +111,13 @@ list_resources_tool = Tool.from_function( async def read_resource( context: Context, - uri: Annotated[AnyUrl | str, "The URI of the resource to read."], + uri: Annotated[AnyUrl, "The URI of the resource to read."], ) -> ResourceResult: """Read a resource available on the server.""" + # Typed as AnyUrl (not `AnyUrl | str`) so pydantic normalizes the incoming + # URI the same way the MCP protocol boundary does (e.g. `file://config.txt` + # -> `file://config.txt/`). A bare `str` branch would skip normalization and + # miss resources whose stored key carries the canonical trailing slash. return await context.read_resource(uri=uri) diff --git a/fastmcp_slim/fastmcp/server/mixins/lifespan.py b/fastmcp_slim/fastmcp/server/mixins/lifespan.py index 3cbb4094c..bfb424c96 100644 --- a/fastmcp_slim/fastmcp/server/mixins/lifespan.py +++ b/fastmcp_slim/fastmcp/server/mixins/lifespan.py @@ -101,6 +101,7 @@ class LifespanMixin: # set up SharedContext so Shared() dependencies work. if not is_docket_available(): async with SharedContext(): + self._capture_shared_context() yield return @@ -119,6 +120,7 @@ class LifespanMixin: # set up SharedContext so Shared() dependencies work. if not task_components: async with SharedContext(): + self._capture_shared_context() yield return @@ -184,6 +186,25 @@ class LifespanMixin: # Reset server ContextVar _current_server.reset(server_token) + def _capture_shared_context(self: FastMCP) -> None: + """Snapshot the live ``SharedContext`` ContextVar values. + + The SDK v2 dispatcher runs each request handler in the *message + sender's* contextvars (via ``ContextReceiveStream.last_context``), not + the server-lifespan context. App-scoped ``Shared()`` dependencies rely + on ``uncalled_for.SharedContext`` ContextVars set during the lifespan, + which are therefore invisible to handlers. We capture those values here + so ``FastMCPServerMiddleware`` can re-apply them per request. + """ + try: + self._shared_context_snapshot = { + SharedContext.resolved: SharedContext.resolved.get(), + SharedContext.lock: SharedContext.lock.get(), + SharedContext.stack: SharedContext.stack.get(), + } + except LookupError: # pragma: no cover - SharedContext not active + self._shared_context_snapshot = None + @asynccontextmanager async def _lifespan_manager(self: FastMCP) -> AsyncIterator[None]: async with self._lifespan_lock: @@ -248,14 +269,15 @@ class LifespanMixin: if not is_docket_available(): return - from mcp.types import ( - CancelTaskRequest, - GetTaskPayloadRequest, - GetTaskRequest, - ListTasksRequest, - ServerResult, + from mcp.server.context import ServerRequestContext + from mcp_types import ( + CancelTaskRequestParams, + GetTaskPayloadRequestParams, + GetTaskRequestParams, + PaginatedRequestParams, ) + from fastmcp.server.dependencies import bind_request_context from fastmcp.server.tasks.requests import ( tasks_cancel_handler, tasks_get_handler, @@ -263,37 +285,46 @@ class LifespanMixin: tasks_result_handler, ) - # Manually register handlers (SDK decorators fail with locally-defined functions) - # SDK expects handlers that receive Request objects and return ServerResult + # v2 handlers take (ctx, params) and return the bare result model. - async def handle_get_task(req: GetTaskRequest) -> ServerResult: - params = req.params.model_dump(by_alias=True, exclude_none=True) - result = await tasks_get_handler(self, params) - return ServerResult(result) + async def handle_get_task( + ctx: ServerRequestContext, params: GetTaskRequestParams + ) -> Any: + with bind_request_context(ctx): + p = params.model_dump(by_alias=True, exclude_none=True) + return await tasks_get_handler(self, p) - async def handle_get_task_result(req: GetTaskPayloadRequest) -> ServerResult: - params = req.params.model_dump(by_alias=True, exclude_none=True) - result = await tasks_result_handler(self, params) - return ServerResult(result) + async def handle_get_task_result( + ctx: ServerRequestContext, params: GetTaskPayloadRequestParams + ) -> Any: + with bind_request_context(ctx): + p = params.model_dump(by_alias=True, exclude_none=True) + return await tasks_result_handler(self, p) - async def handle_list_tasks(req: ListTasksRequest) -> ServerResult: - params = ( - req.params.model_dump(by_alias=True, exclude_none=True) - if req.params - else {} - ) - result = await tasks_list_handler(self, params) - return ServerResult(result) + async def handle_list_tasks( + ctx: ServerRequestContext, params: PaginatedRequestParams | None + ) -> Any: + with bind_request_context(ctx): + p = ( + params.model_dump(by_alias=True, exclude_none=True) + if params + else {} + ) + return await tasks_list_handler(self, p) - async def handle_cancel_task(req: CancelTaskRequest) -> ServerResult: - params = req.params.model_dump(by_alias=True, exclude_none=True) - result = await tasks_cancel_handler(self, params) - return ServerResult(result) + async def handle_cancel_task( + ctx: ServerRequestContext, params: CancelTaskRequestParams + ) -> Any: + with bind_request_context(ctx): + p = params.model_dump(by_alias=True, exclude_none=True) + return await tasks_cancel_handler(self, p) - # Register directly with SDK (same as what decorators do internally) - self._mcp_server.request_handlers[GetTaskRequest] = handle_get_task - self._mcp_server.request_handlers[GetTaskPayloadRequest] = ( - handle_get_task_result + s = self._mcp_server + s.add_request_handler("tasks/get", GetTaskRequestParams, handle_get_task) + s.add_request_handler( + "tasks/result", GetTaskPayloadRequestParams, handle_get_task_result + ) + s.add_request_handler("tasks/list", PaginatedRequestParams, handle_list_tasks) + s.add_request_handler( + "tasks/cancel", CancelTaskRequestParams, handle_cancel_task ) - self._mcp_server.request_handlers[ListTasksRequest] = handle_list_tasks - self._mcp_server.request_handlers[CancelTaskRequest] = handle_cancel_task diff --git a/fastmcp_slim/fastmcp/server/mixins/mcp_operations.py b/fastmcp_slim/fastmcp/server/mixins/mcp_operations.py index 70bd65607..0286ea1fa 100644 --- a/fastmcp_slim/fastmcp/server/mixins/mcp_operations.py +++ b/fastmcp_slim/fastmcp/server/mixins/mcp_operations.py @@ -2,15 +2,23 @@ from __future__ import annotations -from collections.abc import Awaitable, Callable, Sequence -from typing import TYPE_CHECKING, Any, TypeVar, cast +from collections.abc import Sequence +from typing import TYPE_CHECKING, Any, TypeVar -import mcp.types -from mcp.shared.exceptions import McpError -from mcp.types import ContentBlock -from pydantic import AnyUrl +import mcp_types +from mcp.server.context import ServerRequestContext +from mcp.shared.exceptions import MCPError +from mcp_types import ( + CallToolRequestParams, + EmptyResult, + GetPromptRequestParams, + PaginatedRequestParams, + ReadResourceRequestParams, + SetLevelRequestParams, +) -from fastmcp.exceptions import DisabledError, NotFoundError +from fastmcp.exceptions import DisabledError, FastMCPError, NotFoundError +from fastmcp.server.dependencies import bind_request_context, extract_version_spec from fastmcp.server.tasks.config import TaskMeta from fastmcp.utilities.logging import get_logger from fastmcp.utilities.pagination import paginate_sequence @@ -29,7 +37,7 @@ def _apply_pagination( cursor: str | None, page_size: int | None, ) -> tuple[list[PaginateT], str | None]: - """Apply pagination to items, raising McpError for invalid cursors. + """Apply pagination to items, raising MCPError for invalid cursors. If page_size is None, returns all items without pagination. """ @@ -38,336 +46,291 @@ def _apply_pagination( try: return paginate_sequence(items, cursor, page_size) except ValueError as e: - raise McpError(mcp.types.ErrorData(code=-32602, message=str(e))) from e + raise MCPError(code=-32602, message=str(e)) from e + + +def _normalize_call_tool_result( + result: Any, +) -> mcp_types.CallToolResult: + """Normalize a tool's ``to_mcp_result()`` output into a ``CallToolResult``. + + ``ToolResult.to_mcp_result()`` returns one of three shapes for backward + compatibility: a ``CallToolResult`` (error/meta case), a bare + ``list[ContentBlock]`` (unstructured), or a ``(content, structured)`` tuple. + The SDK v2 runner requires a ``BaseModel`` result, so wrap the shorthand + forms here (the SDK's old ``call_tool`` decorator used to do this). + """ + if isinstance(result, mcp_types.CallToolResult): + return result + if isinstance(result, tuple): + content, structured = result + return mcp_types.CallToolResult(content=content, structured_content=structured) + return mcp_types.CallToolResult(content=result) + + +def _version_from_ctx(ctx: ServerRequestContext) -> VersionSpec | None: + """Extract the FastMCP component version from the request's lifted _meta.""" + from fastmcp.server.dependencies import _lift_meta + + version_str = extract_version_spec(_lift_meta(ctx)) + return VersionSpec(eq=version_str) if version_str else None class MCPOperationsMixin: """Mixin providing MCP protocol handler setup and wire-format handlers. - Note: Methods registered with SDK decorators (e.g., _list_tools_mcp, _call_tool_mcp) - cannot use `self: FastMCP` type hints because the SDK's `get_type_hints()` fails - to resolve FastMCP at runtime (it's only available under TYPE_CHECKING). When - type hints fail to resolve, the SDK falls back to calling handlers with no arguments. - These methods use untyped `self` to avoid this issue. + Handlers are registered via ``add_request_handler(method, params_type, + handler)`` on the low-level SDK server. Each adapter takes + ``(ctx: ServerRequestContext, params)`` and returns the bare SDK result + model (no ``ServerResult`` wrapping — the SDK v2 runner serializes the + result itself). """ def _setup_handlers(self: FastMCP) -> None: - """Set up core MCP protocol handlers. - - List handlers use SDK decorators that pass the request object to our handler - (needed for pagination cursor). The SDK also populates caches like _tool_cache. - - Exception: list_resource_templates SDK decorator doesn't pass the request, - so we register that handler directly. - - The call_tool decorator is from the SDK (supports CreateTaskResult + validate_input). - The read_resource and get_prompt decorators are from LowLevelServer to add - CreateTaskResult support until the SDK provides it natively. - """ - self._mcp_server.list_tools()(self._list_tools_mcp) - self._mcp_server.list_resources()(self._list_resources_mcp) - self._mcp_server.list_prompts()(self._list_prompts_mcp) - - # list_resource_templates SDK decorator doesn't pass the request to handlers, - # so we register directly to get cursor access for pagination - self._mcp_server.request_handlers[mcp.types.ListResourceTemplatesRequest] = ( - self._wrap_list_handler(self._list_resource_templates_mcp) + """Register core MCP protocol handlers with the low-level SDK server.""" + s = self._mcp_server + s.add_request_handler("tools/list", PaginatedRequestParams, self._on_list_tools) + s.add_request_handler( + "resources/list", PaginatedRequestParams, self._on_list_resources ) - - self._mcp_server.call_tool(validate_input=self.strict_input_validation)( - self._call_tool_mcp + s.add_request_handler( + "resources/templates/list", + PaginatedRequestParams, + self._on_list_resource_templates, + ) + s.add_request_handler( + "prompts/list", PaginatedRequestParams, self._on_list_prompts + ) + s.add_request_handler("tools/call", CallToolRequestParams, self._on_call_tool) + s.add_request_handler( + "resources/read", ReadResourceRequestParams, self._on_read_resource + ) + s.add_request_handler( + "prompts/get", GetPromptRequestParams, self._on_get_prompt + ) + s.add_request_handler( + "logging/setLevel", SetLevelRequestParams, self._on_set_logging_level ) - self._mcp_server.read_resource()(self._read_resource_mcp) - self._mcp_server.get_prompt()(self._get_prompt_mcp) - self._mcp_server.set_logging_level()(self._set_logging_level_mcp) # Register SEP-1686 task protocol handlers self._setup_task_protocol_handlers() - def _wrap_list_handler( - self: FastMCP, handler: Callable[..., Awaitable[Any]] - ) -> Callable[..., Awaitable[mcp.types.ServerResult]]: - """Wrap a list handler to pass the request and return ServerResult.""" + async def _on_list_tools( + self: FastMCP, + ctx: ServerRequestContext, + params: PaginatedRequestParams | None, + ) -> mcp_types.ListToolsResult: + """List all available tools. Supports pagination via params.cursor.""" + with bind_request_context(ctx): + logger.debug(f"[{self.name}] Handler called: list_tools") - async def wrapper(request: Any) -> mcp.types.ServerResult: - result = await handler(request) - return mcp.types.ServerResult(result) + tools = dedupe_with_versions( + list(await self.list_tools()), lambda t: t.name + ) + sdk_tools = [tool.to_mcp_tool(name=tool.name) for tool in tools] + cursor = params.cursor if params else None + page, next_cursor = _apply_pagination( + sdk_tools, cursor, self._list_page_size + ) + return mcp_types.ListToolsResult(tools=page, next_cursor=next_cursor) - return wrapper + async def _on_list_resources( + self: FastMCP, + ctx: ServerRequestContext, + params: PaginatedRequestParams | None, + ) -> mcp_types.ListResourcesResult: + """List all available resources. Supports pagination via params.cursor.""" + with bind_request_context(ctx): + logger.debug(f"[{self.name}] Handler called: list_resources") - async def _list_tools_mcp( - self, request: mcp.types.ListToolsRequest - ) -> mcp.types.ListToolsResult: - """ - List all available tools, in the format expected by the low-level MCP - server. Supports pagination when list_page_size is configured. - """ - # Cast self to FastMCP for type checking (see class docstring for why - # we can't use `self: FastMCP` annotation on SDK-registered handlers) - server = cast("FastMCP", self) - logger.debug(f"[{server.name}] Handler called: list_tools") - - tools = dedupe_with_versions(list(await server.list_tools()), lambda t: t.name) - sdk_tools = [tool.to_mcp_tool(name=tool.name) for tool in tools] - - # SDK may pass None for internal cache refresh despite type hint - cursor = ( - request.params.cursor if request is not None and request.params else None - ) - page, next_cursor = _apply_pagination(sdk_tools, cursor, server._list_page_size) - return mcp.types.ListToolsResult(tools=page, nextCursor=next_cursor) - - async def _list_resources_mcp( - self, request: mcp.types.ListResourcesRequest - ) -> mcp.types.ListResourcesResult: - """ - List all available resources, in the format expected by the low-level MCP - server. Supports pagination when list_page_size is configured. - """ - server = cast("FastMCP", self) - logger.debug(f"[{server.name}] Handler called: list_resources") - - resources = dedupe_with_versions( - list(await server.list_resources()), lambda r: str(r.uri) - ) - sdk_resources = [ - resource.to_mcp_resource(uri=str(resource.uri)) for resource in resources - ] - - cursor = request.params.cursor if request.params else None - page, next_cursor = _apply_pagination( - sdk_resources, cursor, server._list_page_size - ) - return mcp.types.ListResourcesResult(resources=page, nextCursor=next_cursor) - - async def _list_resource_templates_mcp( - self, request: mcp.types.ListResourceTemplatesRequest - ) -> mcp.types.ListResourceTemplatesResult: - """ - List all available resource templates, in the format expected by the low-level MCP - server. Supports pagination when list_page_size is configured. - """ - server = cast("FastMCP", self) - logger.debug(f"[{server.name}] Handler called: list_resource_templates") - - templates = dedupe_with_versions( - list(await server.list_resource_templates()), lambda t: t.uri_template - ) - sdk_templates = [ - template.to_mcp_template(uriTemplate=template.uri_template) - for template in templates - ] - cursor = request.params.cursor if request.params else None - page, next_cursor = _apply_pagination( - sdk_templates, cursor, server._list_page_size - ) - return mcp.types.ListResourceTemplatesResult( - resourceTemplates=page, nextCursor=next_cursor - ) - - async def _list_prompts_mcp( - self, request: mcp.types.ListPromptsRequest - ) -> mcp.types.ListPromptsResult: - """ - List all available prompts, in the format expected by the low-level MCP - server. Supports pagination when list_page_size is configured. - """ - server = cast("FastMCP", self) - logger.debug(f"[{server.name}] Handler called: list_prompts") - - prompts = dedupe_with_versions( - list(await server.list_prompts()), lambda p: p.name - ) - sdk_prompts = [prompt.to_mcp_prompt(name=prompt.name) for prompt in prompts] - cursor = request.params.cursor if request.params else None - page, next_cursor = _apply_pagination( - sdk_prompts, cursor, server._list_page_size - ) - return mcp.types.ListPromptsResult(prompts=page, nextCursor=next_cursor) - - async def _call_tool_mcp( - self, key: str, arguments: dict[str, Any] - ) -> ( - list[ContentBlock] - | tuple[list[ContentBlock], dict[str, Any]] - | mcp.types.CallToolResult - | mcp.types.CreateTaskResult - ): - """ - Handle MCP 'callTool' requests. - - Extracts task metadata from MCP request context and passes it explicitly - to call_tool(). The tool's _run() method handles the backgrounding decision, - ensuring middleware runs before Docket. - - Args: - key: The name of the tool to call - arguments: Arguments to pass to the tool - - Returns: - Tool result or CreateTaskResult for background execution - """ - server = cast("FastMCP", self) - logger.debug( - f"[{server.name}] Handler called: call_tool %s with %s", key, arguments - ) - - try: - # Extract version and task metadata from request context. - # fn_key is set by call_tool() after finding the tool. - version_str: str | None = None - task_meta: TaskMeta | None = None - try: - ctx = server._mcp_server.request_context - # Extract version from _meta.fastmcp - if ctx.meta: - meta_dict = ctx.meta.model_dump(exclude_none=True) - version_str = meta_dict.get("fastmcp", {}).get("version") - # Extract SEP-1686 task metadata - if ctx.experimental.is_task: - mcp_task_meta = ctx.experimental.task_metadata - task_meta_dict = mcp_task_meta.model_dump(exclude_none=True) - task_meta = TaskMeta(ttl=task_meta_dict.get("ttl")) - except (AttributeError, LookupError): - pass - - version = VersionSpec(eq=version_str) if version_str else None - result = await server.call_tool( - key, arguments, version=version, task_meta=task_meta + resources = dedupe_with_versions( + list(await self.list_resources()), lambda r: str(r.uri) + ) + sdk_resources = [ + resource.to_mcp_resource(uri=str(resource.uri)) + for resource in resources + ] + cursor = params.cursor if params else None + page, next_cursor = _apply_pagination( + sdk_resources, cursor, self._list_page_size + ) + return mcp_types.ListResourcesResult( + resources=page, next_cursor=next_cursor ) - if isinstance(result, mcp.types.CreateTaskResult): + async def _on_list_resource_templates( + self: FastMCP, + ctx: ServerRequestContext, + params: PaginatedRequestParams | None, + ) -> mcp_types.ListResourceTemplatesResult: + """List all available resource templates. Supports pagination.""" + with bind_request_context(ctx): + logger.debug(f"[{self.name}] Handler called: list_resource_templates") + + templates = dedupe_with_versions( + list(await self.list_resource_templates()), lambda t: t.uri_template + ) + sdk_templates = [ + template.to_mcp_template(uri_template=template.uri_template) + for template in templates + ] + cursor = params.cursor if params else None + page, next_cursor = _apply_pagination( + sdk_templates, cursor, self._list_page_size + ) + return mcp_types.ListResourceTemplatesResult( + resource_templates=page, next_cursor=next_cursor + ) + + async def _on_list_prompts( + self: FastMCP, + ctx: ServerRequestContext, + params: PaginatedRequestParams | None, + ) -> mcp_types.ListPromptsResult: + """List all available prompts. Supports pagination via params.cursor.""" + with bind_request_context(ctx): + logger.debug(f"[{self.name}] Handler called: list_prompts") + + prompts = dedupe_with_versions( + list(await self.list_prompts()), lambda p: p.name + ) + sdk_prompts = [prompt.to_mcp_prompt(name=prompt.name) for prompt in prompts] + cursor = params.cursor if params else None + page, next_cursor = _apply_pagination( + sdk_prompts, cursor, self._list_page_size + ) + return mcp_types.ListPromptsResult(prompts=page, next_cursor=next_cursor) + + async def _on_call_tool( + self: FastMCP, + ctx: ServerRequestContext, + params: CallToolRequestParams, + ) -> mcp_types.CallToolResult | mcp_types.CreateTaskResult: + """Handle MCP 'tools/call' requests. + + Task metadata is a first-class params field (``params.task``); its + presence triggers backgrounding. The tool's ``_run()`` handles the + backgrounding decision so middleware runs before Docket. + """ + with bind_request_context(ctx): + key = params.name + arguments = params.arguments or {} + logger.debug( + f"[{self.name}] Handler called: call_tool %s with %s", key, arguments + ) + + version = _version_from_ctx(ctx) + task_meta = ( + TaskMeta(ttl=params.task.ttl) if params.task is not None else None + ) + + try: + result = await self.call_tool( + key, arguments, version=version, task_meta=task_meta + ) + except (DisabledError, NotFoundError): + # Unknown/disabled tool: return an error result (matching the + # v1 SDK's call_tool behavior) so the client surfaces a + # ToolError rather than a raw protocol error. + return mcp_types.CallToolResult( + content=[ + mcp_types.TextContent( + type="text", text=f"Unknown tool: {key!r}" + ) + ], + is_error=True, + ) + except FastMCPError as e: + # Tool-visible errors (ToolError, ValidationError, ...) must be + # RETURNED as an error result, never raised — the SDK v2 runner + # turns a raise into a -32603 wire error. Masking already + # happened inside call_tool. + return mcp_types.CallToolResult( + content=[mcp_types.TextContent(type="text", text=str(e))], + is_error=True, + ) + + if isinstance(result, mcp_types.CreateTaskResult): return result - return result.to_mcp_result() + return _normalize_call_tool_result(result.to_mcp_result()) - except DisabledError as e: - raise NotFoundError(f"Unknown tool: {key!r}") from e - except NotFoundError as e: - raise NotFoundError(f"Unknown tool: {key!r}") from e + async def _on_read_resource( + self: FastMCP, + ctx: ServerRequestContext, + params: ReadResourceRequestParams, + ) -> mcp_types.ReadResourceResult | mcp_types.CreateTaskResult: + """Handle MCP 'resources/read' requests. - async def _read_resource_mcp( - self, uri: AnyUrl | str - ) -> mcp.types.ReadResourceResult | mcp.types.CreateTaskResult: - """Handle MCP 'readResource' requests. - - Extracts task metadata from MCP request context and passes it explicitly - to read_resource(). The resource's _read() method handles the backgrounding - decision, ensuring middleware runs before Docket. - - Args: - uri: The resource URI - - Returns: - ReadResourceResult or CreateTaskResult for background execution + Note: ``ReadResourceRequestParams`` has no ``task`` field in this SDK + version, so resource task submission over the wire is not expressible; + ``task_meta`` is always None here. The CreateTaskResult return branch is + retained harmlessly pending an upstream ``task`` field on these params. """ - server = cast("FastMCP", self) - logger.debug(f"[{server.name}] Handler called: read_resource %s", uri) + with bind_request_context(ctx): + uri = params.uri + logger.debug(f"[{self.name}] Handler called: read_resource %s", uri) + + version = _version_from_ctx(ctx) - try: - # Extract version and task metadata from request context. - version_str: str | None = None - task_meta: TaskMeta | None = None try: - ctx = server._mcp_server.request_context - # Extract version from _meta.fastmcp.version if provided - if ctx.meta: - meta_dict = ctx.meta.model_dump(exclude_none=True) - fastmcp_meta = meta_dict.get("fastmcp") or {} - version_str = fastmcp_meta.get("version") - # Extract SEP-1686 task metadata - if ctx.experimental.is_task: - mcp_task_meta = ctx.experimental.task_metadata - task_meta_dict = mcp_task_meta.model_dump(exclude_none=True) - task_meta = TaskMeta(ttl=task_meta_dict.get("ttl")) - except (AttributeError, LookupError): - pass + result = await self.read_resource(str(uri), version=version) + except (DisabledError, NotFoundError) as e: + raise MCPError( + code=-32002, message=f"Resource not found: {str(uri)!r}" + ) from e - version = VersionSpec(eq=version_str) if version_str else None - result = await server.read_resource( - str(uri), version=version, task_meta=task_meta - ) - - if isinstance(result, mcp.types.CreateTaskResult): + if isinstance(result, mcp_types.CreateTaskResult): return result return result.to_mcp_result(uri) - except DisabledError as e: - raise McpError( - mcp.types.ErrorData( - code=-32002, message=f"Resource not found: {str(uri)!r}" - ) - ) from e - except NotFoundError as e: - raise McpError( - mcp.types.ErrorData(code=-32002, message=f"Resource not found: {e}") - ) from e - async def _get_prompt_mcp( - self, name: str, arguments: dict[str, Any] | None - ) -> mcp.types.GetPromptResult | mcp.types.CreateTaskResult: - """Handle MCP 'getPrompt' requests. + async def _on_get_prompt( + self: FastMCP, + ctx: ServerRequestContext, + params: GetPromptRequestParams, + ) -> mcp_types.GetPromptResult | mcp_types.CreateTaskResult: + """Handle MCP 'prompts/get' requests. - Extracts task metadata from MCP request context and passes it explicitly - to render_prompt(). The prompt's _render() method handles the backgrounding - decision, ensuring middleware runs before Docket. - - Args: - name: The prompt name - arguments: Prompt arguments - - Returns: - GetPromptResult or CreateTaskResult for background execution + Note: ``GetPromptRequestParams`` has no ``task`` field in this SDK + version, so prompt task submission over the wire is not expressible; + ``task_meta`` is always None here. """ - server = cast("FastMCP", self) - logger.debug( - f"[{server.name}] Handler called: get_prompt %s with %s", name, arguments - ) - - try: - # Extract version and task metadata from request context. - # fn_key is set by render_prompt() after finding the prompt. - version_str: str | None = None - task_meta: TaskMeta | None = None - try: - ctx = server._mcp_server.request_context - # Extract version from request-level _meta.fastmcp.version - if ctx.meta: - meta_dict = ctx.meta.model_dump(exclude_none=True) - version_str = meta_dict.get("fastmcp", {}).get("version") - # Extract SEP-1686 task metadata - if ctx.experimental.is_task: - mcp_task_meta = ctx.experimental.task_metadata - task_meta_dict = mcp_task_meta.model_dump(exclude_none=True) - task_meta = TaskMeta(ttl=task_meta_dict.get("ttl")) - except (AttributeError, LookupError): - pass - - version = VersionSpec(eq=version_str) if version_str else None - result = await server.render_prompt( - name, arguments, version=version, task_meta=task_meta + with bind_request_context(ctx): + name = params.name + arguments = params.arguments + logger.debug( + f"[{self.name}] Handler called: get_prompt %s with %s", + name, + arguments, ) - if isinstance(result, mcp.types.CreateTaskResult): + version = _version_from_ctx(ctx) + + try: + result = await self.render_prompt(name, arguments, version=version) + except (DisabledError, NotFoundError) as e: + raise MCPError(code=-32602, message=f"Unknown prompt: {name!r}") from e + + if isinstance(result, mcp_types.CreateTaskResult): return result return result.to_mcp_prompt_result() - except DisabledError as e: - raise NotFoundError(f"Unknown prompt: {name!r}") from e - except NotFoundError: - raise - async def _set_logging_level_mcp(self, level: mcp.types.LoggingLevel) -> None: + async def _on_set_logging_level( + self: FastMCP, + ctx: ServerRequestContext, + params: SetLevelRequestParams, + ) -> mcp_types.EmptyResult: """Handle MCP 'logging/setLevel' requests. - Stores the requested minimum log level on the session so that - subsequent log messages below this level are suppressed. + Stores the requested minimum log level keyed by session id so that + subsequent log messages below this level are suppressed. v2 sessions are + per-request, so this state lives on the FastMCP server. """ - from fastmcp.server.low_level import MiddlewareServerSession + from fastmcp.server.context import _log_level_session_key - server = cast("FastMCP", self) - logger.debug(f"[{server.name}] Handler called: set_logging_level %s", level) - try: - ctx = server._mcp_server.request_context - session = ctx.session - if isinstance(session, MiddlewareServerSession): - session._minimum_logging_level = level - except LookupError: - pass + with bind_request_context(ctx) as rc: + logger.debug( + f"[{self.name}] Handler called: set_logging_level %s", params.level + ) + session_id = _log_level_session_key(rc.session) + self._client_log_levels[session_id] = params.level + return EmptyResult() diff --git a/fastmcp_slim/fastmcp/server/mixins/transport.py b/fastmcp_slim/fastmcp/server/mixins/transport.py index 9cb257412..721833060 100644 --- a/fastmcp_slim/fastmcp/server/mixins/transport.py +++ b/fastmcp_slim/fastmcp/server/mixins/transport.py @@ -232,7 +232,6 @@ class TransportMixin: tools_changed=True ), ), - stateless=stateless, ) finally: reset_transport(token) diff --git a/fastmcp_slim/fastmcp/server/providers/fastmcp_provider.py b/fastmcp_slim/fastmcp/server/providers/fastmcp_provider.py index e532da5cb..14dbbbae0 100644 --- a/fastmcp_slim/fastmcp/server/providers/fastmcp_provider.py +++ b/fastmcp_slim/fastmcp/server/providers/fastmcp_provider.py @@ -14,8 +14,8 @@ from collections.abc import AsyncIterator, Sequence from contextlib import asynccontextmanager from typing import TYPE_CHECKING, Any, overload -import mcp.types -from mcp.types import AnyUrl +import mcp_types +from pydantic import AnyUrl from fastmcp.prompts.base import Prompt, PromptResult from fastmcp.resources.base import Resource, ResourceResult @@ -92,13 +92,13 @@ class FastMCPProviderTool(Tool): self, arguments: dict[str, Any], task_meta: TaskMeta, - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def _run( self, arguments: dict[str, Any], task_meta: TaskMeta | None = None, - ) -> ToolResult | mcp.types.CreateTaskResult: + ) -> ToolResult | mcp_types.CreateTaskResult: """Delegate to child server's call_tool() with task_meta. Passes task_meta through to the child server so it can handle @@ -134,7 +134,7 @@ class FastMCPProviderTool(Tool): self._original_name, arguments, version=version ) # Result from call_tool should always be ToolResult when no task_meta - if isinstance(result, mcp.types.CreateTaskResult): + if isinstance(result, mcp_types.CreateTaskResult): raise RuntimeError( "Unexpected CreateTaskResult from call_tool without task_meta" ) @@ -190,11 +190,11 @@ class FastMCPProviderResource(Resource): async def _read(self, task_meta: None = None) -> ResourceResult: ... @overload - async def _read(self, task_meta: TaskMeta) -> mcp.types.CreateTaskResult: ... + async def _read(self, task_meta: TaskMeta) -> mcp_types.CreateTaskResult: ... async def _read( self, task_meta: TaskMeta | None = None - ) -> ResourceResult | mcp.types.CreateTaskResult: + ) -> ResourceResult | mcp_types.CreateTaskResult: """Delegate to child server's read_resource() with task_meta. Passes task_meta through to the child server so it can handle @@ -270,13 +270,13 @@ class FastMCPProviderPrompt(Prompt): self, arguments: dict[str, Any] | None, task_meta: TaskMeta, - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def _render( self, arguments: dict[str, Any] | None = None, task_meta: TaskMeta | None = None, - ) -> PromptResult | mcp.types.CreateTaskResult: + ) -> PromptResult | mcp_types.CreateTaskResult: """Delegate to child server's render_prompt() with task_meta. Passes task_meta through to the child server so it can handle @@ -309,7 +309,7 @@ class FastMCPProviderPrompt(Prompt): self._original_name, arguments, version=version ) # Result from render_prompt should always be PromptResult when no task_meta - if isinstance(result, mcp.types.CreateTaskResult): + if isinstance(result, mcp_types.CreateTaskResult): raise RuntimeError( "Unexpected CreateTaskResult from render_prompt without task_meta" ) @@ -396,11 +396,11 @@ class FastMCPProviderResourceTemplate(ResourceTemplate): @overload async def _read( self, uri: str, params: dict[str, Any], task_meta: TaskMeta - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def _read( self, uri: str, params: dict[str, Any], task_meta: TaskMeta | None = None - ) -> ResourceResult | mcp.types.CreateTaskResult: + ) -> ResourceResult | mcp_types.CreateTaskResult: """Delegate to child server's read_resource() with task_meta. Passes task_meta through to the child server so it can handle @@ -437,7 +437,7 @@ class FastMCPProviderResourceTemplate(ResourceTemplate): # Read from the wrapped server result = await self._server.read_resource(original_uri, version=version) - if isinstance(result, mcp.types.CreateTaskResult): + if isinstance(result, mcp_types.CreateTaskResult): raise RuntimeError("Unexpected CreateTaskResult during Docket execution") return result diff --git a/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/prompts.py b/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/prompts.py index 583aed563..5564df32d 100644 --- a/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/prompts.py +++ b/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/prompts.py @@ -11,14 +11,14 @@ from collections.abc import Callable from functools import partial from typing import TYPE_CHECKING, Any, TypeVar, overload -import mcp.types -from mcp.types import AnyFunction +import mcp_types import fastmcp from fastmcp.prompts.base import Prompt from fastmcp.prompts.function_prompt import FunctionPrompt from fastmcp.server.auth.authorization import AuthCheck from fastmcp.server.tasks.config import TaskConfig +from fastmcp.utilities.types import AnyFunction if TYPE_CHECKING: from fastmcp.server.providers.local_provider import LocalProvider @@ -79,7 +79,7 @@ class PromptDecoratorMixin: version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, enabled: bool = True, meta: dict[str, Any] | None = None, @@ -96,7 +96,7 @@ class PromptDecoratorMixin: version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, enabled: bool = True, meta: dict[str, Any] | None = None, @@ -112,7 +112,7 @@ class PromptDecoratorMixin: version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, enabled: bool = True, meta: dict[str, Any] | None = None, diff --git a/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/resources.py b/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/resources.py index 41043a461..cfbf3e40e 100644 --- a/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/resources.py +++ b/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/resources.py @@ -10,8 +10,8 @@ import inspect from collections.abc import Callable from typing import TYPE_CHECKING, Any, TypeVar -import mcp.types -from mcp.types import Annotations, AnyFunction +import mcp_types +from mcp_types import Annotations import fastmcp from fastmcp.resources.base import Resource @@ -19,6 +19,7 @@ from fastmcp.resources.function_resource import resource as standalone_resource from fastmcp.resources.template import ResourceTemplate from fastmcp.server.auth.authorization import AuthCheck from fastmcp.server.tasks.config import TaskConfig +from fastmcp.utilities.types import AnyFunction if TYPE_CHECKING: from fastmcp.server.providers.local_provider import LocalProvider @@ -112,7 +113,7 @@ class ResourceDecoratorMixin: version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, mime_type: str | None = None, tags: set[str] | None = None, enabled: bool = True, diff --git a/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/tools.py b/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/tools.py index 06bcc7277..1f685dd02 100644 --- a/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/tools.py +++ b/fastmcp_slim/fastmcp/server/providers/local_provider/decorators/tools.py @@ -23,8 +23,8 @@ from typing import ( overload, ) -import mcp.types -from mcp.types import AnyFunction, ToolAnnotations +import mcp_types +from mcp_types import ToolAnnotations import fastmcp from fastmcp.exceptions import FastMCPDeprecationWarning @@ -32,7 +32,7 @@ from fastmcp.server.auth.authorization import AuthCheck from fastmcp.server.tasks.config import TaskConfig from fastmcp.tools.base import Tool from fastmcp.tools.function_tool import FunctionTool -from fastmcp.utilities.types import NotSet, NotSetT +from fastmcp.utilities.types import AnyFunction, NotSet, NotSetT try: from prefab_ui.app import PrefabApp as _PrefabApp @@ -184,7 +184,7 @@ class ToolDecoratorMixin: version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, annotations: ToolAnnotations | dict[str, Any] | None = None, @@ -207,7 +207,7 @@ class ToolDecoratorMixin: version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, annotations: ToolAnnotations | dict[str, Any] | None = None, @@ -233,7 +233,7 @@ class ToolDecoratorMixin: version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, annotations: ToolAnnotations | dict[str, Any] | None = None, diff --git a/fastmcp_slim/fastmcp/server/providers/openapi/components.py b/fastmcp_slim/fastmcp/server/providers/openapi/components.py index 466c1bf1d..a6f0a505f 100644 --- a/fastmcp_slim/fastmcp/server/providers/openapi/components.py +++ b/fastmcp_slim/fastmcp/server/providers/openapi/components.py @@ -9,7 +9,7 @@ from collections.abc import Callable from typing import TYPE_CHECKING, Any import httpx -from mcp.types import ToolAnnotations +from mcp_types import ToolAnnotations from pydantic.networks import AnyUrl import fastmcp diff --git a/fastmcp_slim/fastmcp/server/providers/proxy.py b/fastmcp_slim/fastmcp/server/providers/proxy.py index 3b3ccc265..fd0817af1 100644 --- a/fastmcp_slim/fastmcp/server/providers/proxy.py +++ b/fastmcp_slim/fastmcp/server/providers/proxy.py @@ -15,13 +15,11 @@ from typing import TYPE_CHECKING, Any, cast import anyio import httpx -import mcp.types -from mcp import ServerSession -from mcp.client.session import ClientSession -from mcp.server.lowlevel.server import request_ctx -from mcp.shared.context import LifespanContextT, RequestContext -from mcp.shared.exceptions import McpError -from mcp.types import ( +import mcp_types +from mcp.server.connection import Connection +from mcp.server.context import ServerRequestContext +from mcp.shared.exceptions import MCPError +from mcp_types import ( METHOD_NOT_FOUND, BlobResourceContents, ElicitRequestFormParams, @@ -29,7 +27,7 @@ from mcp.types import ( ) from pydantic.networks import AnyUrl -from fastmcp.client.client import Client, FastMCP1Server +from fastmcp.client.client import Client, SDKServer from fastmcp.client.elicitation import ElicitResult, create_elicitation_callback from fastmcp.client.logging import LogMessage, create_log_callback from fastmcp.client.roots import RootsList, create_roots_callback @@ -44,7 +42,7 @@ from fastmcp.resources import Resource, ResourceTemplate from fastmcp.resources.base import ResourceContent, ResourceResult from fastmcp.resources.template import expand_uri_template from fastmcp.server.context import Context -from fastmcp.server.dependencies import get_context +from fastmcp.server.dependencies import fastmcp_request_ctx, get_context from fastmcp.server.middleware import CallNext, Middleware, MiddlewareContext from fastmcp.server.providers.aggregate import ProviderErrorStrategy from fastmcp.server.providers.base import Provider @@ -66,30 +64,50 @@ logger = get_logger(__name__) ClientFactoryT = Callable[[], Client] | Callable[[], Awaitable[Client]] -def _proxy_upstream_error(error: Exception) -> McpError: - return McpError( - mcp.types.ErrorData( - code=mcp.types.INTERNAL_ERROR, - message=str(error), - ) +def _proxy_upstream_error(error: Exception) -> MCPError: + return MCPError( + code=mcp_types.INTERNAL_ERROR, + message=str(error), ) +def _stash_proxy_request_context(client: Client, ctx: Context) -> None: + """Stash the proxy's ``RequestContext`` on a ``ProxyClient`` before a backend call. + + Every proxy component (tool, resource, template, prompt) must call this + before relaying to its backend so the forwarding handlers can restore the + proxy's request context before relaying a server-initiated request + (roots/sampling/elicitation) back to the proxy's client. Required for every + proxy client: under SDK v2 an in-memory backend shares this event loop, so a + handler's ``get_context()`` would otherwise resolve to the backend context + and the server-initiated request would hang until timeout. + + We stash a ``(RequestContext, weakref[FastMCP])`` tuple — never a ``Context`` + instance — because ``Context`` properties are themselves ContextVar-dependent + and would resolve stale values in the receive loop. + """ + if isinstance(client, ProxyClient): + client._proxy_rc_ref[0] = ( + ctx.request_context, + ctx._fastmcp, # weakref to FastMCP, not the Context + ) + + class ProxyInitializeMiddleware(Middleware): def __init__(self, proxy: FastMCPProxy) -> None: self.proxy = proxy async def on_initialize( self, - context: MiddlewareContext[mcp.types.InitializeRequest], + context: MiddlewareContext[mcp_types.InitializeRequest], call_next: CallNext[ - mcp.types.InitializeRequest, - mcp.types.InitializeResult | None, + mcp_types.InitializeRequest, + mcp_types.InitializeResult | None, ], - ) -> mcp.types.InitializeResult | None: + ) -> mcp_types.InitializeResult | None: client = await self.proxy._get_client() try: - if isinstance(client, StatefulProxyClient): + if isinstance(client, ProxyClient): ctx = context.fastmcp_context if ctx is not None: client._proxy_rc_ref[0] = ( @@ -98,7 +116,7 @@ class ProxyInitializeMiddleware(Middleware): ) async with client: await client.initialize() - except McpError: + except MCPError: raise except ( RuntimeError, @@ -146,7 +164,7 @@ class ProxyTool(Tool): @classmethod def from_mcp_tool( - cls, client_factory: ClientFactoryT, mcp_tool: mcp.types.Tool + cls, client_factory: ClientFactoryT, mcp_tool: mcp_types.Tool ) -> ProxyTool: """Factory method to create a ProxyTool from a raw MCP tool schema.""" return cls( @@ -154,9 +172,9 @@ class ProxyTool(Tool): name=mcp_tool.name, title=mcp_tool.title, description=mcp_tool.description, - parameters=mcp_tool.inputSchema, + parameters=mcp_tool.input_schema, annotations=mcp_tool.annotations, - output_schema=mcp_tool.outputSchema, + output_schema=mcp_tool.output_schema, icons=mcp_tool.icons, meta=mcp_tool.meta, tags=get_fastmcp_metadata(mcp_tool.meta).get("tags", []), @@ -180,34 +198,16 @@ class ProxyTool(Tool): client = await self._get_client() async with client: ctx = context or get_context() - # StatefulProxyClient reuses sessions across requests, so - # its receive-loop task has stale ContextVars from the first - # request. Stash the current RequestContext in the shared - # ref so handlers can restore it before forwarding. - if isinstance(client, StatefulProxyClient): - client._proxy_rc_ref[0] = ( - ctx.request_context, - ctx._fastmcp, # weakref to FastMCP, not the Context - ) - # Build meta dict from request context - meta: dict[str, Any] | None = None - if hasattr(ctx, "request_context"): - req_ctx = ctx.request_context - # Start with existing meta if present - if hasattr(req_ctx, "meta") and req_ctx.meta: - meta = dict(req_ctx.meta) - # Add task metadata if this is a task request - if ( - hasattr(req_ctx, "experimental") - and hasattr(req_ctx.experimental, "is_task") - and req_ctx.experimental.is_task - ): - task_metadata = req_ctx.experimental.task_metadata - if task_metadata: - meta = meta or {} - meta["modelcontextprotocol.io/task"] = ( - task_metadata.model_dump(exclude_none=True) - ) + _stash_proxy_request_context(client, ctx) + # Forward the inbound request's `_meta` block (trace context, + # version, etc.) to the backend. In SDK v2 the request context + # exposes the lifted `_meta` dict directly; task submission is a + # first-class params field rather than context state, so there + # is no separate task-metadata injection here. + req_ctx = ctx.request_context + meta: dict[str, Any] | None = ( + dict(req_ctx.meta) if req_ctx is not None and req_ctx.meta else None + ) result = await client.call_tool_mcp( name=backend_name, arguments=arguments, meta=meta @@ -219,9 +219,9 @@ class ProxyTool(Tool): # Preserve backend's meta (includes task metadata for background tasks) return ToolResult( content=result.content, - structured_content=result.structuredContent, + structured_content=result.structured_content, meta=result.meta, - is_error=result.isError, + is_error=result.is_error, ) def get_span_attributes(self) -> dict[str, Any]: @@ -269,7 +269,7 @@ class ProxyResource(Resource): def from_mcp_resource( cls, client_factory: ClientFactoryT, - mcp_resource: mcp.types.Resource, + mcp_resource: mcp_types.Resource, ) -> ProxyResource: """Factory method to create a ProxyResource from a raw MCP resource schema.""" @@ -279,7 +279,7 @@ class ProxyResource(Resource): name=mcp_resource.name, title=mcp_resource.title, description=mcp_resource.description, - mime_type=mcp_resource.mimeType or "text/plain", + mime_type=mcp_resource.mime_type or "text/plain", icons=mcp_resource.icons, meta=mcp_resource.meta, tags=get_fastmcp_metadata(mcp_resource.meta).get("tags", []), @@ -301,6 +301,7 @@ class ProxyResource(Resource): span.set_attribute("fastmcp.provider.type", "ProxyProvider") client = await self._get_client() async with client: + _stash_proxy_request_context(client, get_context()) result = await client.read_resource(backend_uri) if not result: raise ResourceError( @@ -314,7 +315,7 @@ class ProxyResource(Resource): contents.append( ResourceContent( content=item.text, - mime_type=item.mimeType, + mime_type=item.mime_type, meta=item.meta, ) ) @@ -322,7 +323,7 @@ class ProxyResource(Resource): contents.append( ResourceContent( content=base64.b64decode(item.blob), - mime_type=item.mimeType, + mime_type=item.mime_type, meta=item.meta, ) ) @@ -366,17 +367,17 @@ class ProxyTemplate(ResourceTemplate): @classmethod def from_mcp_template( # type: ignore[override] - cls, client_factory: ClientFactoryT, mcp_template: mcp.types.ResourceTemplate + cls, client_factory: ClientFactoryT, mcp_template: mcp_types.ResourceTemplate ) -> ProxyTemplate: # ty:ignore[invalid-method-override] """Factory method to create a ProxyTemplate from a raw MCP template schema.""" return cls( client_factory=client_factory, - uri_template=mcp_template.uriTemplate, + uri_template=mcp_template.uri_template, name=mcp_template.name, title=mcp_template.title, description=mcp_template.description, - mime_type=mcp_template.mimeType or "text/plain", + mime_type=mcp_template.mime_type or "text/plain", icons=mcp_template.icons, parameters={}, # Remote templates don't have local parameters meta=mcp_template.meta, @@ -398,6 +399,7 @@ class ProxyTemplate(ResourceTemplate): parameterized_uri = expand_uri_template(backend_template, params) client = await self._get_client() async with client: + _stash_proxy_request_context(client, context or get_context()) result = await client.read_resource(parameterized_uri) if not result: @@ -412,7 +414,7 @@ class ProxyTemplate(ResourceTemplate): contents.append( ResourceContent( content=item.text, - mime_type=item.mimeType, + mime_type=item.mime_type, meta=item.meta, ) ) @@ -420,7 +422,7 @@ class ProxyTemplate(ResourceTemplate): contents.append( ResourceContent( content=base64.b64decode(item.blob), - mime_type=item.mimeType, + mime_type=item.mime_type, meta=item.meta, ) ) @@ -437,7 +439,7 @@ class ProxyTemplate(ResourceTemplate): description=self.description, mime_type=result[ 0 - ].mimeType, # Use first item's mimeType for backward compatibility + ].mime_type, # Use first item's mimeType for backward compatibility icons=self.icons, meta=self.meta, tags=get_fastmcp_metadata(self.meta).get("tags", []), @@ -481,7 +483,7 @@ class ProxyPrompt(Prompt): @classmethod def from_mcp_prompt( - cls, client_factory: ClientFactoryT, mcp_prompt: mcp.types.Prompt + cls, client_factory: ClientFactoryT, mcp_prompt: mcp_types.Prompt ) -> ProxyPrompt: """Factory method to create a ProxyPrompt from a raw MCP prompt schema.""" arguments = [ @@ -516,6 +518,7 @@ class ProxyPrompt(Prompt): span.set_attribute("fastmcp.provider.type", "ProxyProvider") client = await self._get_client() async with client: + _stash_proxy_request_context(client, get_context()) result = await client.get_prompt(backend_name, arguments) # Convert GetPromptResult to PromptResult, preserving meta from result # (not the static prompt meta which includes fastmcp tags) @@ -635,7 +638,7 @@ class ProxyProvider(Provider): tools = [ ProxyTool.from_mcp_tool(self.client_factory, t) for t in mcp_tools ] - except McpError as e: + except MCPError as e: if e.error.code == METHOD_NOT_FOUND: tools = [] else: @@ -672,7 +675,7 @@ class ProxyProvider(Provider): ProxyResource.from_mcp_resource(self.client_factory, r) for r in mcp_resources ] - except McpError as e: + except MCPError as e: if e.error.code == METHOD_NOT_FOUND: resources = [] else: @@ -709,7 +712,7 @@ class ProxyProvider(Provider): ProxyTemplate.from_mcp_template(self.client_factory, t) for t in mcp_templates ] - except McpError as e: + except MCPError as e: if e.error.code == METHOD_NOT_FOUND: templates = [] else: @@ -746,7 +749,7 @@ class ProxyProvider(Provider): ProxyPrompt.from_mcp_prompt(self.client_factory, p) for p in mcp_prompts ] - except McpError as e: + except MCPError as e: if e.error.code == METHOD_NOT_FOUND: prompts = [] else: @@ -796,7 +799,7 @@ def _create_client_factory( Client[ClientTransportT] | ClientTransport | FastMCP[Any] - | FastMCP1Server + | SDKServer | AnyUrl | Path | MCPConfig @@ -919,14 +922,17 @@ class FastMCPProxy(FastMCP): def _setup_proxy_ping_handler(self) -> None: async def ping_remote( - _request: mcp.types.PingRequest, - ) -> mcp.types.ServerResult: + _ctx: ServerRequestContext[Any, Any], + _params: mcp_types.RequestParams | None, + ) -> mcp_types.EmptyResult: client = await self._get_client() async with client: await client.ping() - return mcp.types.ServerResult(mcp.types.EmptyResult()) + return mcp_types.EmptyResult() - self._mcp_server.request_handlers[mcp.types.PingRequest] = ping_remote + self._mcp_server.add_request_handler( + "ping", mcp_types.RequestParams, ping_remote + ) # ----------------------------------------------------------------------------- @@ -935,7 +941,7 @@ class FastMCPProxy(FastMCP): async def default_proxy_roots_handler( - context: RequestContext[ClientSession, LifespanContextT], + context: ServerRequestContext[Any, Any], ) -> RootsList: """Forward list roots request from remote server to proxy's connected clients.""" ctx = get_context() @@ -943,21 +949,21 @@ async def default_proxy_roots_handler( async def default_proxy_sampling_handler( - messages: list[mcp.types.SamplingMessage], - params: mcp.types.CreateMessageRequestParams, - context: RequestContext[ClientSession, LifespanContextT], -) -> mcp.types.CreateMessageResult: + messages: list[mcp_types.SamplingMessage], + params: mcp_types.CreateMessageRequestParams, + context: ServerRequestContext[Any, Any], +) -> mcp_types.CreateMessageResult: """Forward sampling request from remote server to proxy's connected clients.""" ctx = get_context() result = await ctx.sample( list(messages), - system_prompt=params.systemPrompt, + system_prompt=params.system_prompt, temperature=params.temperature, - max_tokens=params.maxTokens, - model_preferences=params.modelPreferences, + max_tokens=params.max_tokens, + model_preferences=params.model_preferences, ) - content = mcp.types.TextContent(type="text", text=result.text or "") - return mcp.types.CreateMessageResult( + content = mcp_types.TextContent(type="text", text=result.text or "") + return mcp_types.CreateMessageResult( role="assistant", model="fastmcp-client", # TODO(ty): remove when ty supports isinstance exclusion narrowing @@ -968,20 +974,20 @@ async def default_proxy_sampling_handler( async def default_proxy_elicitation_handler( message: str, response_type: type, - params: mcp.types.ElicitRequestParams, - context: RequestContext[ClientSession, LifespanContextT], + params: mcp_types.ElicitRequestParams, + context: ServerRequestContext[Any, Any], ) -> ElicitResult: """Forward elicitation request from remote server to proxy's connected clients.""" ctx = get_context() # requestedSchema only exists on ElicitRequestFormParams, not ElicitRequestURLParams requested_schema = ( - params.requestedSchema + params.requested_schema if isinstance(params, ElicitRequestFormParams) else {"type": "object", "properties": {}} ) result = await ctx.session.elicit( message=message, - requestedSchema=requested_schema, + requested_schema=requested_schema, related_request_id=ctx.request_id, ) return ElicitResult(action=result.action, content=result.content) @@ -1009,13 +1015,17 @@ def _restore_request_context( rc_ref: list[Any], ) -> None: """Set the ``request_ctx``, ``_current_context`` and ``_current_server`` - ContextVars from stashed values. + ContextVars from stashed values so a proxy forwarding handler relays to the + proxy's own client rather than the upstream server. - Called at the start of proxy handler invocations in - ``StatefulProxyClient`` to fix stale ContextVars in the receive-loop - task. Only overrides when the ContextVar is genuinely stale (same - session, different request_id) to avoid corrupting the concurrent - case where multiple sessions share the same ref via ``copy.copy``. + Called at the start of every proxy handler invocation. The stashed proxy + ``RequestContext`` is the correct forwarding target, so we restore it unless + it is already active. This covers two cases: + + - Stateful proxy: the reused receive-loop task carries a stale ContextVar + from an earlier request (same session, different request_id). + - In-memory backend (SDK v2): the backend runs in this event loop, so the + handler may inherit the *backend's* request_ctx (a different session). We stash a ``(RequestContext, weakref[FastMCP])`` tuple — never a ``Context`` instance — because ``Context`` properties are themselves @@ -1041,21 +1051,15 @@ def _restore_request_context( return rc, fastmcp_ref = stashed - try: - current_rc = request_ctx.get() - except LookupError: - request_ctx.set(rc) - fastmcp = fastmcp_ref() - if fastmcp is not None: - _current_context.set(Context(fastmcp)) - _current_server.set(weakref.ref(fastmcp)) + current_rc = fastmcp_request_ctx.get() + # Restore unless the stashed proxy context is already the active one. + if current_rc is rc: return - if current_rc.session is rc.session and current_rc.request_id != rc.request_id: - request_ctx.set(rc) - fastmcp = fastmcp_ref() - if fastmcp is not None: - _current_context.set(Context(fastmcp)) - _current_server.set(weakref.ref(fastmcp)) + fastmcp_request_ctx.set(rc) + fastmcp = fastmcp_ref() + if fastmcp is not None: + _current_context.set(Context(fastmcp)) + _current_server.set(weakref.ref(fastmcp)) def _make_restoring_handler(handler: Callable, rc_ref: list[Any]) -> Callable: @@ -1077,13 +1081,32 @@ class ProxyClient(Client[ClientTransportT]): """A proxy client that forwards advanced interactions between a remote MCP server and the proxy's connected clients. Supports forwarding roots, sampling, elicitation, logging, and progress. + + The default forwarding handlers must resolve the *proxy's* request context so + they relay server-initiated requests (roots/sampling/elicitation) back to the + proxy's own connected client, not to the upstream server they are talking to. + Under SDK v2 an in-memory backend runs in the same event loop as this client, + so a naive ``get_context()`` inside a handler can resolve to the backend's + context and forward the request straight back to the backend — an infinite + loop. To avoid that, ``ProxyTool.run`` (and the other proxy components) stash + the proxy-side ``RequestContext`` in ``_proxy_rc_ref`` before each backend + call, and the handlers are wrapped to restore it before forwarding. """ + # Mutable list shared across copies (Client.new() uses copy.copy, which + # preserves references to mutable containers). Proxy components write [0] + # before each backend call; handlers read it to restore the proxy's + # request_ctx before forwarding. Stores a (RequestContext, weakref[FastMCP]) + # tuple — never a Context instance — because Context properties are + # ContextVar-dependent and would resolve stale values in the receive loop. + _proxy_rc_ref: list[Any] + _proxy_restoring_handler_keys: set[str] + def __init__( self, transport: ClientTransportT | FastMCP[Any] - | FastMCP1Server + | SDKServer | AnyUrl | Path | MCPConfig @@ -1093,58 +1116,6 @@ class ProxyClient(Client[ClientTransportT]): ): if "name" not in kwargs: kwargs["name"] = self.generate_name() - if "roots" not in kwargs: - kwargs["roots"] = default_proxy_roots_handler - if "sampling_handler" not in kwargs: - kwargs["sampling_handler"] = default_proxy_sampling_handler - if "elicitation_handler" not in kwargs: - kwargs["elicitation_handler"] = default_proxy_elicitation_handler - if "log_handler" not in kwargs: - kwargs["log_handler"] = default_proxy_log_handler - if "progress_handler" not in kwargs: - kwargs["progress_handler"] = default_proxy_progress_handler - super().__init__(transport=transport, **kwargs) # ty: ignore[no-matching-overload] - - # Enable forwarding of inbound HTTP headers (e.g. authorization) to - # the upstream server. This is only appropriate for proxy clients, - # where the caller's credentials should be propagated. - from fastmcp.client.transports.http import StreamableHttpTransport - from fastmcp.client.transports.sse import SSETransport - - if isinstance(self.transport, StreamableHttpTransport | SSETransport): - self.transport.forward_incoming_headers = True - - -class StatefulProxyClient(ProxyClient[ClientTransportT]): - """A proxy client that provides a stateful client factory for the proxy server. - - The stateful proxy client bound its copy to the server session. - And it will be disconnected when the session is exited. - - This is useful to proxy a stateful mcp server such as the Playwright MCP server. - Note that it is essential to ensure that the proxy server itself is also stateful. - - Because session reuse means the receive-loop task inherits a stale - ``request_ctx`` ContextVar snapshot, the default proxy handlers are - replaced with versions that restore the ContextVar before forwarding. - ``ProxyTool.run`` stashes the current ``RequestContext`` in - ``_proxy_rc_ref`` before each backend call, and the handlers consult - it to detect (and correct) staleness. - """ - - # Mutable list shared across copies (Client.new() uses copy.copy, - # which preserves references to mutable containers). ProxyTool.run - # writes [0] before each backend call; handlers read it to detect - # stale ContextVars and restore the correct request_ctx. - # - # Stores a (RequestContext, weakref[FastMCP]) tuple — never a Context - # instance — because Context properties are ContextVar-dependent and - # would resolve stale values in the receive loop. The restore helper - # constructs a fresh Context from the weakref after setting request_ctx. - _proxy_rc_ref: list[Any] - _proxy_restoring_handler_keys: set[str] - - def __init__(self, *args: Any, **kwargs: Any): # Install context-restoring handler wrappers BEFORE super().__init__ # registers them with the Client's session kwargs. self._proxy_rc_ref = [None] @@ -1159,9 +1130,16 @@ class StatefulProxyClient(ProxyClient[ClientTransportT]): if key not in kwargs: kwargs[key] = _make_restoring_handler(default_fn, self._proxy_rc_ref) self._proxy_restoring_handler_keys.add(key) + super().__init__(transport=transport, **kwargs) # ty: ignore[no-matching-overload] - super().__init__(*args, **kwargs) - self._caches: dict[ServerSession, Client[ClientTransportT]] = {} + # Enable forwarding of inbound HTTP headers (e.g. authorization) to + # the upstream server. This is only appropriate for proxy clients, + # where the caller's credentials should be propagated. + from fastmcp.client.transports.http import StreamableHttpTransport + from fastmcp.client.transports.sse import SSETransport + + if isinstance(self.transport, StreamableHttpTransport | SSETransport): + self.transport.forward_incoming_headers = True def _bind_restoring_handlers(self) -> None: if "roots" in self._proxy_restoring_handler_keys: @@ -1189,12 +1167,40 @@ class StatefulProxyClient(ProxyClient[ClientTransportT]): default_proxy_progress_handler, self._proxy_rc_ref ) - def new(self) -> StatefulProxyClient[ClientTransportT]: - new_client = cast(StatefulProxyClient[ClientTransportT], super().new()) + def new(self) -> ProxyClient[ClientTransportT]: + new_client = cast(ProxyClient[ClientTransportT], super().new()) new_client._proxy_rc_ref = [None] + new_client._proxy_restoring_handler_keys = set( + self._proxy_restoring_handler_keys + ) new_client._bind_restoring_handlers() return new_client + +class StatefulProxyClient(ProxyClient[ClientTransportT]): + """A proxy client that provides a stateful client factory for the proxy server. + + The stateful proxy client bound its copy to the server session. + And it will be disconnected when the session is exited. + + This is useful to proxy a stateful mcp server such as the Playwright MCP server. + Note that it is essential to ensure that the proxy server itself is also stateful. + + The base ``ProxyClient`` already installs the context-restoring handlers + (see its docstring); this subclass additionally caches one client per stable + ``Connection`` and forces disconnect when the connection is torn down. + """ + + def __init__(self, *args: Any, **kwargs: Any): + super().__init__(*args, **kwargs) + # SDK v2 constructs a ServerSession per request, so per-session keying + # would build a fresh proxy client for every request. Key by the stable + # per-connection `Connection` instead, and tie cleanup to its exit stack. + self._caches: dict[Connection, Client[ClientTransportT]] = {} + + def new(self) -> StatefulProxyClient[ClientTransportT]: + return cast(StatefulProxyClient[ClientTransportT], super().new()) + async def __aexit__(self, exc_type, exc_value, traceback) -> None: # type: ignore[override] # ty:ignore[invalid-method-override] """The stateful proxy client will be forced disconnected when the session is exited. @@ -1213,17 +1219,27 @@ class StatefulProxyClient(ProxyClient[ClientTransportT]): Use this method as the client factory for stateful proxy server. """ session = get_context().session - proxy_client = self._caches.get(session, None) + # SDK v2: the ServerSession is per-request; the Connection is the stable + # per-connection object that owns the exit stack. Key the cache and the + # cleanup callback off it so one proxy client is reused for the whole + # connection instead of one per request. + connection = getattr(session, "_connection", None) + if connection is None: + raise RuntimeError( + "Stateful proxy requires a per-connection server session; " + "no connection is available on the current context." + ) + proxy_client = self._caches.get(connection, None) if proxy_client is None: proxy_client = self.new() - logger.debug(f"{proxy_client} created for {session}") - self._caches[session] = proxy_client + logger.debug(f"{proxy_client} created for {connection}") + self._caches[connection] = proxy_client - async def _on_session_exit(): - self._caches.pop(session, None) + async def _on_connection_exit(): + self._caches.pop(connection, None) logger.debug(f"{proxy_client} will be disconnect") - # This callback runs while the server session's exit stack is + # This callback runs while the connection's exit stack is # unwinding, which usually happens because the owning task is # being cancelled. Shield the disconnect so the forced cleanup # actually runs to completion instead of aborting at the first @@ -1231,6 +1247,6 @@ class StatefulProxyClient(ProxyClient[ClientTransportT]): with anyio.CancelScope(shield=True): await proxy_client._disconnect(force=True) - session._exit_stack.push_async_callback(_on_session_exit) + connection.exit_stack.push_async_callback(_on_connection_exit) return proxy_client diff --git a/fastmcp_slim/fastmcp/server/sampling/run.py b/fastmcp_slim/fastmcp/server/sampling/run.py index 47c04d78c..1fba19a5b 100644 --- a/fastmcp_slim/fastmcp/server/sampling/run.py +++ b/fastmcp_slim/fastmcp/server/sampling/run.py @@ -9,7 +9,7 @@ from dataclasses import dataclass from typing import TYPE_CHECKING, Any, Generic, Literal, cast import anyio -from mcp.types import ( +from mcp_types import ( ClientCapabilities, CreateMessageResult, CreateMessageResultWithTools, @@ -24,8 +24,8 @@ from mcp.types import ( ToolResultContent, ToolUseContent, ) -from mcp.types import CreateMessageRequestParams as SamplingParams -from mcp.types import Tool as SDKTool +from mcp_types import CreateMessageRequestParams as SamplingParams +from mcp_types import Tool as SDKTool from opentelemetry.trace import SpanKind, Status, StatusCode from pydantic import ValidationError from typing_extensions import TypeVar @@ -88,7 +88,7 @@ class SampleStep: def is_tool_use(self) -> bool: """True if the LLM is requesting tool execution.""" if isinstance(self.response, CreateMessageResultWithTools): - return self.response.stopReason == "toolUse" + return self.response.stop_reason == "toolUse" return False @property @@ -222,15 +222,18 @@ async def call_sampling_handler( result = context.fastmcp.sampling_handler( messages, SamplingParams( - systemPrompt=system_prompt, + system_prompt=system_prompt, messages=messages, temperature=temperature, - maxTokens=max_tokens, - modelPreferences=_parse_model_preferences(model_preferences), + max_tokens=max_tokens, + model_preferences=_parse_model_preferences(model_preferences), tools=sdk_tools, - toolChoice=tool_choice, + tool_choice=tool_choice, ), - context.request_context, + # SamplingHandler is typed against the SDK's RequestContext placeholder, + # but FastMCP hands handlers its own FastMCPRequestContext wrapper at + # runtime; the two aren't structurally related in the type system. + context.request_context, # ty: ignore[invalid-argument-type] ) if inspect.isawaitable(result): @@ -244,7 +247,7 @@ async def call_sampling_handler( role="assistant", content=TextContent(type="text", text=result), model="unknown", - stopReason="endTurn", + stop_reason="endTurn", ) return result @@ -287,14 +290,14 @@ async def execute_tools( if tool is None: return ToolResultContent( type="tool_result", - toolUseId=tool_use.id, + tool_use_id=tool_use.id, content=[ TextContent( type="text", text=f"Error: Unknown tool '{tool_use.name}'", ) ], - isError=True, + is_error=True, ) tracer = get_tracer() @@ -309,7 +312,7 @@ async def execute_tools( result_value = await tool.run(tool_use.input) return ToolResultContent( type="tool_result", - toolUseId=tool_use.id, + tool_use_id=tool_use.id, content=[TextContent(type="text", text=str(result_value))], ) except ToolError as e: @@ -324,9 +327,9 @@ async def execute_tools( ) return ToolResultContent( type="tool_result", - toolUseId=tool_use.id, + tool_use_id=tool_use.id, content=[TextContent(type="text", text=str(e))], - isError=True, + is_error=True, ) except Exception as e: if span.is_recording(): @@ -340,9 +343,9 @@ async def execute_tools( error_text = f"Error executing tool '{tool_use.name}': {e}" return ToolResultContent( type="tool_result", - toolUseId=tool_use.id, + tool_use_id=tool_use.id, content=[TextContent(type="text", text=error_text)], - isError=True, + is_error=True, ) # Check if any tool requires sequential execution @@ -555,7 +558,9 @@ async def sample_step_impl( tool_choice=effective_tool_choice, ) else: - response = await context.session.create_message( + # Deprecated upstream in SDK v2 but deliberately kept per compat + # directive; removed with the multi-round-trip follow-up. + response = await context.session.create_message( # ty: ignore[deprecated] messages=current_messages, system_prompt=system_prompt, temperature=temperature, @@ -575,7 +580,7 @@ async def sample_step_impl( # Check if this is a tool use response is_tool_use_response = ( isinstance(response, CreateMessageResultWithTools) - and response.stopReason == "toolUse" + and response.stop_reason == "toolUse" ) # Always include the assistant response in history @@ -718,7 +723,7 @@ async def sample_impl( content=[ ToolResultContent( type="tool_result", - toolUseId=tool_call.id, + tool_use_id=tool_call.id, content=[ TextContent( type="text", @@ -728,7 +733,7 @@ async def sample_impl( ), ) ], - isError=True, + is_error=True, ) ], ) diff --git a/fastmcp_slim/fastmcp/server/sampling/sampling_tool.py b/fastmcp_slim/fastmcp/server/sampling/sampling_tool.py index 217d2f21f..05063dc53 100644 --- a/fastmcp_slim/fastmcp/server/sampling/sampling_tool.py +++ b/fastmcp_slim/fastmcp/server/sampling/sampling_tool.py @@ -6,8 +6,8 @@ import inspect from collections.abc import Callable from typing import Any -from mcp.types import TextContent -from mcp.types import Tool as SDKTool +from mcp_types import TextContent +from mcp_types import Tool as SDKTool from pydantic import ConfigDict from fastmcp.exceptions import AuthorizationError @@ -69,7 +69,7 @@ class SamplingTool(FastMCPBaseModel): return result def _to_sdk_tool(self) -> SDKTool: - """Convert to an mcp.types.Tool for SDK compatibility. + """Convert to an mcp_types.Tool for SDK compatibility. This is used internally when passing tools to the MCP SDK's create_message() method. @@ -77,7 +77,7 @@ class SamplingTool(FastMCPBaseModel): return SDKTool( name=self.name, description=self.description, - inputSchema=self.parameters, + input_schema=self.parameters, ) @classmethod diff --git a/fastmcp_slim/fastmcp/server/server.py b/fastmcp_slim/fastmcp/server/server.py index b9ed14d6d..ed1f81c26 100644 --- a/fastmcp_slim/fastmcp/server/server.py +++ b/fastmcp_slim/fastmcp/server/server.py @@ -22,15 +22,14 @@ from pathlib import Path from typing import TYPE_CHECKING, Any, Generic, Literal, TypeVar, cast, overload import httpx -import mcp.types +import mcp_types from key_value.aio.adapters.pydantic import PydanticAdapter from key_value.aio.protocols import AsyncKeyValue from key_value.aio.stores.memory import MemoryStore from mcp.server.lowlevel.server import LifespanResultT -from mcp.shared.exceptions import McpError -from mcp.types import ( +from mcp.shared.exceptions import MCPError +from mcp_types import ( Annotations, - AnyFunction, CallToolRequestParams, ToolAnnotations, ) @@ -82,7 +81,7 @@ from fastmcp.tools.function_tool import FunctionTool from fastmcp.tools.tool_transform import ToolTransformConfig from fastmcp.utilities.components import FastMCPComponent, _coerce_version from fastmcp.utilities.logging import get_logger -from fastmcp.utilities.types import FastMCPBaseModel, NotSet, NotSetT +from fastmcp.utilities.types import AnyFunction, FastMCPBaseModel, NotSet, NotSetT from fastmcp.utilities.versions import ( VersionSpec, version_sort_key, @@ -90,7 +89,7 @@ from fastmcp.utilities.versions import ( if TYPE_CHECKING: from fastmcp.client import Client - from fastmcp.client.client import FastMCP1Server + from fastmcp.client.client import SDKServer from fastmcp.client.sampling import SamplingHandler from fastmcp.client.transports import ClientTransport, ClientTransportT from fastmcp.server.providers.openapi import ComponentFn as OpenAPIComponentFn @@ -103,7 +102,7 @@ logger = get_logger(__name__) def _version_request_meta( version: VersionSpec | None, -) -> mcp.types.RequestParams.Meta | None: +) -> dict[str, Any] | None: if version is None: return None @@ -123,9 +122,9 @@ def _version_request_meta( if not version_value: return None - return mcp.types.RequestParams.Meta.model_validate( - {"fastmcp": {"version": version_value}} - ) + # SDK v2: request `_meta` is a plain dict (the `Meta` type alias), not the + # old `RequestParams.Meta` nested model. + return {"fastmcp": {"version": version_value}} # The MCP SDK warns "Tool X not listed, no validation will be performed" @@ -325,7 +324,7 @@ class FastMCP( *, version: str | int | float | None = None, website_url: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, auth: AuthProvider | None = None, middleware: Sequence[Middleware] | None = None, providers: Sequence[Provider] | None = None, @@ -341,7 +340,7 @@ class FastMCP( session_state_store: AsyncKeyValue | None = None, sampling_handler: SamplingHandler | None = None, sampling_handler_behavior: Literal["always", "fallback"] | None = None, - client_log_level: mcp.types.LoggingLevel | None = None, + client_log_level: mcp_types.LoggingLevel | None = None, experimental_capabilities: dict[str, dict[str, Any]] | None = None, **kwargs: Any, ): @@ -404,12 +403,16 @@ class FastMCP( self._lifespan = cast(LifespanCallable[LifespanResultT], default_lifespan) self._lifespan_result: LifespanResultT | None = None self._lifespan_result_set: bool = False + # Snapshot of SharedContext ContextVar values captured during the + # lifespan, re-applied per request by FastMCPServerMiddleware because + # the SDK v2 dispatcher runs handlers in the sender's context. + self._shared_context_snapshot: dict[Any, Any] | None = None self._lifespan_ref_count: int = 0 self._lifespan_lock: asyncio.Lock = asyncio.Lock() self._started: asyncio.Event = asyncio.Event() # Generate random ID if no name provided - self._mcp_server: LowLevelServer[LifespanResultT, Any] = LowLevelServer[ + self._mcp_server: LowLevelServer[LifespanResultT] = LowLevelServer[ LifespanResultT ]( fastmcp=self, @@ -435,12 +438,18 @@ class FastMCP( else fastmcp.settings.strict_input_validation ) - self.client_log_level: mcp.types.LoggingLevel | None = ( + self.client_log_level: mcp_types.LoggingLevel | None = ( client_log_level if client_log_level is not None else fastmcp.settings.client_log_level ) + # Per-session minimum log level requested by clients via logging/setLevel. + # Keyed by session id (a sentinel for stdio where session_id is None). + # v2 sessions are per-request so this state lives on the server, not the + # session object. + self._client_log_levels: dict[str, mcp_types.LoggingLevel] = {} + self.experimental_capabilities: dict[str, dict[str, Any]] = ( experimental_capabilities or {} ) @@ -486,7 +495,7 @@ class FastMCP( return self._mcp_server.website_url @property - def icons(self) -> list[mcp.types.Icon]: + def icons(self) -> list[mcp_types.Icon]: if self._mcp_server.icons is None: return [] else: @@ -658,7 +667,7 @@ class FastMCP( async with fastmcp.server.context.Context(fastmcp=self) as ctx: if run_middleware: mw_context = MiddlewareContext( - message=mcp.types.ListToolsRequest(method="tools/list"), + message=mcp_types.ListToolsRequest(method="tools/list"), source="client", type="request", method="tools/list", @@ -1195,7 +1204,7 @@ class FastMCP( version: VersionSpec | None = None, run_middleware: bool = True, task_meta: TaskMeta, - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def call_tool( self, @@ -1205,7 +1214,7 @@ class FastMCP( version: VersionSpec | None = None, run_middleware: bool = True, task_meta: TaskMeta | None = None, - ) -> ToolResult | mcp.types.CreateTaskResult: + ) -> ToolResult | mcp_types.CreateTaskResult: """Call a tool by name. This is the public API for executing tools. By default, middleware is applied. @@ -1248,10 +1257,12 @@ class FastMCP( async with fastmcp.server.context.Context(fastmcp=self) as ctx: if run_middleware: mw_context = MiddlewareContext[CallToolRequestParams]( - message=mcp.types.CallToolRequestParams( + message=mcp_types.CallToolRequestParams( name=name, arguments=arguments or {}, - _meta=_version_request_meta(version), # type: ignore[unknown-argument] # pydantic alias + # `_meta` carries the app-level `fastmcp` version key, which the + # reserved-key RequestParamsMeta TypedDict can't express statically. + _meta=_version_request_meta(version), # type: ignore[unknown-argument] # ty: ignore[invalid-argument-type] ), source="client", type="request", @@ -1375,7 +1386,7 @@ class FastMCP( version: VersionSpec | None = None, run_middleware: bool = True, task_meta: TaskMeta, - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def read_resource( self, @@ -1384,7 +1395,7 @@ class FastMCP( version: VersionSpec | None = None, run_middleware: bool = True, task_meta: TaskMeta | None = None, - ) -> ResourceResult | mcp.types.CreateTaskResult: + ) -> ResourceResult | mcp_types.CreateTaskResult: """Read a resource by URI. This is the public API for reading resources. By default, middleware is applied. @@ -1416,11 +1427,12 @@ class FastMCP( async with fastmcp.server.context.Context(fastmcp=self) as ctx: if run_middleware: - uri_param = AnyUrl(uri) mw_context = MiddlewareContext( - message=mcp.types.ReadResourceRequestParams( - uri=uri_param, - _meta=_version_request_meta(version), # type: ignore[unknown-argument] # pydantic alias + message=mcp_types.ReadResourceRequestParams( + uri=str(uri), + # `_meta` carries the app-level `fastmcp` version key, which the + # reserved-key RequestParamsMeta TypedDict can't express statically. + _meta=_version_request_meta(version), # type: ignore[unknown-argument] # ty: ignore[invalid-argument-type] ), source="client", type="request", @@ -1473,7 +1485,7 @@ class FastMCP( exc_info=True, ) raise - except McpError: + except MCPError: logger.exception(f"Error reading resource {uri!r}") raise except Exception as e: @@ -1517,7 +1529,7 @@ class FastMCP( e.log_level, f"Error reading resource {uri!r}", exc_info=True ) raise - except McpError: + except MCPError: logger.exception(f"Error reading resource {uri!r}") raise except Exception as e: @@ -1557,7 +1569,7 @@ class FastMCP( version: VersionSpec | None = None, run_middleware: bool = True, task_meta: TaskMeta, - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def render_prompt( self, @@ -1567,7 +1579,7 @@ class FastMCP( version: VersionSpec | None = None, run_middleware: bool = True, task_meta: TaskMeta | None = None, - ) -> PromptResult | mcp.types.CreateTaskResult: + ) -> PromptResult | mcp_types.CreateTaskResult: """Render a prompt by name. This is the public API for rendering prompts. By default, middleware is applied. @@ -1594,10 +1606,12 @@ class FastMCP( async with fastmcp.server.context.Context(fastmcp=self) as ctx: if run_middleware: mw_context = MiddlewareContext( - message=mcp.types.GetPromptRequestParams( + message=mcp_types.GetPromptRequestParams( name=name, arguments=arguments, - _meta=_version_request_meta(version), # type: ignore[unknown-argument] # pydantic alias + # `_meta` carries the app-level `fastmcp` version key, which the + # reserved-key RequestParamsMeta TypedDict can't express statically. + _meta=_version_request_meta(version), # type: ignore[unknown-argument] # ty: ignore[invalid-argument-type] ), source="client", type="request", @@ -1638,7 +1652,7 @@ class FastMCP( e.log_level, f"Error rendering prompt {name!r}", exc_info=True ) raise - except McpError: + except MCPError: logger.exception(f"Error rendering prompt {name!r}") raise except Exception as e: @@ -1699,7 +1713,7 @@ class FastMCP( version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, annotations: ToolAnnotations | dict[str, Any] | None = None, @@ -1721,7 +1735,7 @@ class FastMCP( version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, annotations: ToolAnnotations | dict[str, Any] | None = None, @@ -1742,7 +1756,7 @@ class FastMCP( version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, output_schema: dict[str, Any] | NotSetT | None = NotSet, annotations: ToolAnnotations | dict[str, Any] | None = None, @@ -1867,7 +1881,7 @@ class FastMCP( version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, mime_type: str | None = None, tags: set[str] | None = None, annotations: Annotations | dict[str, Any] | None = None, @@ -1998,7 +2012,7 @@ class FastMCP( version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, meta: dict[str, Any] | None = None, task: bool | TaskConfig | None = None, @@ -2014,7 +2028,7 @@ class FastMCP( version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, meta: dict[str, Any] | None = None, task: bool | TaskConfig | None = None, @@ -2029,7 +2043,7 @@ class FastMCP( version: str | int | None = None, title: str | None = None, description: str | None = None, - icons: list[mcp.types.Icon] | None = None, + icons: list[mcp_types.Icon] | None = None, tags: set[str] | None = None, meta: dict[str, Any] | None = None, task: bool | TaskConfig | None = None, @@ -2439,7 +2453,7 @@ class FastMCP( Client[ClientTransportT] | ClientTransport | FastMCP[Any] - | FastMCP1Server + | SDKServer | AnyUrl | Path | MCPConfig @@ -2489,7 +2503,7 @@ def create_proxy( Client[ClientTransportT] | ClientTransport | FastMCP[Any] - | FastMCP1Server + | SDKServer | AnyUrl | Path | MCPConfig diff --git a/fastmcp_slim/fastmcp/server/tasks/capabilities.py b/fastmcp_slim/fastmcp/server/tasks/capabilities.py index f30ef58d3..d2ed14ff4 100644 --- a/fastmcp_slim/fastmcp/server/tasks/capabilities.py +++ b/fastmcp_slim/fastmcp/server/tasks/capabilities.py @@ -1,6 +1,6 @@ """SEP-1686 task capabilities declaration.""" -from mcp.types import ( +from mcp_types import ( ServerTasksCapability, ServerTasksRequestsCapability, TasksCallCapability, @@ -22,8 +22,14 @@ def get_task_capabilities() -> ServerTasksCapability | None: with an old transitive pydocket would advertise task support and then return "method not found" when clients invoked it. - Note: prompts/resources are passed via extra_data since the SDK types - don't include them yet (FastMCP supports them ahead of the spec). + Only tools are advertised as task-capable. In the SDK v2 b1 wire types, + ``ReadResourceRequestParams`` / ``GetPromptRequestParams`` carry no ``task`` + field (sdk-feedback #3), so resource/prompt task submissions are not + wire-expressible and always graceful-degrade to synchronous execution. + Advertising ``prompts``/``resources`` task support would mislead + capability-discovering clients into sending task-augmented reads/gets that + silently run synchronously. Restore them here once the SDK adds task + metadata to those request params. """ # Function-local import to avoid a circular import at module load time: # fastmcp.server.tasks.__init__ pulls in this module, and dependencies @@ -38,7 +44,5 @@ def get_task_capabilities() -> ServerTasksCapability | None: cancel=TasksCancelCapability(), requests=ServerTasksRequestsCapability( tools=TasksToolsCapability(call=TasksCallCapability()), - prompts={"get": {}}, # type: ignore[call-arg] # extra_data for forward compat # ty:ignore[unknown-argument] - resources={"read": {}}, # type: ignore[call-arg] # extra_data for forward compat # ty:ignore[unknown-argument] ), ) diff --git a/fastmcp_slim/fastmcp/server/tasks/elicitation.py b/fastmcp_slim/fastmcp/server/tasks/elicitation.py index 2790c51ca..d9a6e6df2 100644 --- a/fastmcp_slim/fastmcp/server/tasks/elicitation.py +++ b/fastmcp_slim/fastmcp/server/tasks/elicitation.py @@ -21,7 +21,7 @@ import uuid from datetime import datetime, timezone from typing import TYPE_CHECKING, Any -import mcp.types +import mcp_types from mcp import ServerSession from fastmcp.server.tasks.context import get_task_context, get_task_session_id @@ -50,7 +50,7 @@ async def elicit_for_task( message: str, schema: dict[str, Any], fastmcp: FastMCP, -) -> mcp.types.ElicitResult: +) -> mcp_types.ElicitResult: """Send an elicitation request from a background task. This function handles the complexity of eliciting user input when running @@ -68,7 +68,7 @@ async def elicit_for_task( Raises: RuntimeError: If Docket is not available - McpError: If the elicitation request fails + MCPError: If the elicitation request fails """ docket = fastmcp._docket if docket is None: @@ -154,7 +154,7 @@ async def elicit_for_task( "No session_id available for task %s, cannot deliver elicitation notification", task_id, ) - return mcp.types.ElicitResult(action="cancel", content=None) + return mcp_types.ElicitResult(action="cancel", content=None) try: await push_notification(session_id, notification_dict, docket) @@ -175,7 +175,7 @@ async def elicit_for_task( ) except Exception: pass # Keys will expire via TTL - return mcp.types.ElicitResult(action="cancel", content=None) + return mcp_types.ElicitResult(action="cancel", content=None) # Wait for response using BLPOP (blocking pop) # This is much more efficient than polling - single Redis round-trip @@ -203,7 +203,7 @@ async def elicit_for_task( ) # Convert to ElicitResult - return mcp.types.ElicitResult( + return mcp_types.ElicitResult( action=response.get("action", "accept"), content=response.get("content"), ) @@ -230,7 +230,7 @@ async def elicit_for_task( cleanup_error, ) - return mcp.types.ElicitResult(action="cancel", content=None) + return mcp_types.ElicitResult(action="cancel", content=None) async def relay_elicitation( @@ -257,7 +257,7 @@ async def relay_elicitation( try: result = await session.elicit( message=elicitation["message"], - requestedSchema=elicitation["requestedSchema"], + requested_schema=elicitation["requestedSchema"], ) await handle_task_input( task_id=task_id, diff --git a/fastmcp_slim/fastmcp/server/tasks/handlers.py b/fastmcp_slim/fastmcp/server/tasks/handlers.py index b427a0dfe..4b2ac1740 100644 --- a/fastmcp_slim/fastmcp/server/tasks/handlers.py +++ b/fastmcp_slim/fastmcp/server/tasks/handlers.py @@ -5,14 +5,15 @@ Handles queuing tool/prompt/resource executions to Docket as background tasks. from __future__ import annotations +import asyncio import uuid from contextlib import suppress from datetime import datetime, timezone from typing import TYPE_CHECKING, Any, Literal -import mcp.types -from mcp.shared.exceptions import McpError -from mcp.types import INTERNAL_ERROR, ErrorData +import mcp_types +from mcp.shared.exceptions import MCPError +from mcp_types import INTERNAL_ERROR from fastmcp.server.dependencies import ( _current_docket, @@ -26,6 +27,7 @@ from fastmcp.server.tasks.context import ( register_task_session, ) from fastmcp.server.tasks.keys import build_task_key, task_redis_prefix +from fastmcp.tools.function_tool import _strict_input_validation from fastmcp.utilities.logging import get_logger if TYPE_CHECKING: @@ -46,7 +48,7 @@ async def submit_to_docket( component: Tool | Resource | ResourceTemplate | Prompt, arguments: dict[str, Any] | None = None, task_meta: TaskMeta | None = None, -) -> mcp.types.CreateTaskResult: +) -> mcp_types.CreateTaskResult: """Submit any component to Docket for background execution (SEP-1686). Unified handler for all component types. Called by component's internal @@ -70,15 +72,25 @@ async def submit_to_docket( # here must surface before the Redis metadata and initial "working" # notification below are written, otherwise an invalid input would orphan a # task the client has already observed (#4349). + # + # Honor the server's strict_input_validation setting so a strict tool + # rejects lax coercions (e.g. {"n": "1"} for n: int) at submission just as + # it does on the synchronous call path — otherwise task=True would bypass + # strict validation entirely. if arguments is not None: - arguments = component.coerce_task_arguments(arguments) + arguments = component.coerce_task_arguments( + arguments, strict=_strict_input_validation() + ) # Generate server-side task ID per SEP-1686 final spec (line 375-377) # Server MUST generate task IDs, clients no longer provide them server_task_id = str(uuid.uuid4()) - # Record creation timestamp per SEP-1686 final spec (line 430) + # Record creation timestamp per SEP-1686 final spec (line 430). SDK v2 + # types `Task.created_at` / `TaskStatusNotificationParams.created_at` as ISO + # strings, so carry a serialized copy for wire-crossing models. created_at = datetime.now(timezone.utc) + created_at_iso = created_at.isoformat() ctx = get_context() @@ -95,11 +107,9 @@ async def submit_to_docket( # mounted children (whose parent server owns the Docket instance). docket = ctx.fastmcp._docket or _current_docket.get() if docket is None: - raise McpError( - ErrorData( - code=INTERNAL_ERROR, - message="Background tasks require a running FastMCP server context", - ) + raise MCPError( + code=INTERNAL_ERROR, + message="Background tasks require a running FastMCP server context", ) # Register the current server so background workers resolve @@ -144,15 +154,15 @@ async def submit_to_docket( # Send an initial tasks/status notification before queueing. # This guarantees clients can observe task creation immediately. - notification = mcp.types.TaskStatusNotification.model_validate( + notification = mcp_types.TaskStatusNotification.model_validate( { "method": "notifications/tasks/status", "params": { "taskId": server_task_id, "status": "working", "statusMessage": "Task submitted", - "createdAt": created_at, - "lastUpdatedAt": created_at, + "createdAt": created_at_iso, + "lastUpdatedAt": created_at_iso, "ttl": ttl_ms, "pollInterval": poll_interval_ms, }, @@ -163,10 +173,11 @@ async def submit_to_docket( }, } ) - server_notification = mcp.types.ServerNotification(notification) + # SDK v2: `ServerNotification` is a union type, not a wrapper class; + # `send_notification` takes the bare notification model directly. with suppress(Exception): # Don't let notification failures break task creation - await ctx.session.send_notification(server_notification) + await ctx.session.send_notification(notification) # type: ignore[arg-type] # ty:ignore[invalid-argument-type] # Queue function to Docket by key (result storage via execution_ttl) # Use component.add_to_docket() which handles calling conventions @@ -178,22 +189,33 @@ async def submit_to_docket( else: await component.add_to_docket(docket, arguments, fn_key=key, task_key=task_key) # type: ignore[call-arg] # ty:ignore[invalid-argument-type, too-many-positional-arguments] - # Spawn subscription task to send status notifications (SEP-1686 optional feature) - # Start subscription in session's task group (persists for connection lifetime) + # Spawn subscription task to send status notifications (SEP-1686 optional feature). + # SDK v2 constructs a ServerSession per request and exposes no per-connection + # task group, so the subscription runs as a standalone asyncio task that + # outlives the submitting request; it is cancelled when the connection closes. # Deferred: subscriptions and notifications depend on docket at import time from fastmcp.server.tasks.subscriptions import subscribe_to_task_updates - if hasattr(ctx.session, "_subscription_task_group"): - tg = ctx.session._subscription_task_group - if tg: - tg.start_soon( # type: ignore[union-attr] # ty:ignore[unresolved-attribute] - subscribe_to_task_updates, - server_task_id, - task_key, - ctx.session, - docket, - poll_interval_ms, - ) + subscription_task = asyncio.create_task( + subscribe_to_task_updates( + server_task_id, + task_key, + ctx.session, + docket, + poll_interval_ms, + ), + name=f"task-subscription-{server_task_id[:8]}", + ) + connection = getattr(ctx.session, "_connection", None) + if connection is not None: + + async def _cancel_subscription() -> None: + if not subscription_task.done(): + subscription_task.cancel() + with suppress(asyncio.CancelledError): + await subscription_task + + connection.exit_stack.push_async_callback(_cancel_subscription) # Deferred: notifications depends on docket at import time from fastmcp.server.tasks.notifications import ( @@ -207,32 +229,35 @@ async def submit_to_docket( session_id, ctx.session, docket, ctx.fastmcp ) - # Register cleanup callback on session exit (once per session) - # This ensures subscriber is stopped when the session disconnects - if ( - hasattr(ctx.session, "_exit_stack") - and ctx.session._exit_stack is not None - and not getattr(ctx.session, "_notification_cleanup_registered", False) + # Register cleanup callback on connection exit (once per session). + # SDK v2 constructs ServerSession per request, so the stable + # per-connection lifecycle hook lives on the underlying Connection + # (`connection.exit_stack`), not the session. The registration flag + # is likewise stashed on the connection's `state` so it survives + # across requests. + connection = getattr(ctx.session, "_connection", None) + if connection is not None and not connection.state.get( + "_notification_cleanup_registered" ): async def _cleanup_subscriber() -> None: await stop_subscriber(session_id) # type: ignore[arg-type] - ctx.session._exit_stack.push_async_callback(_cleanup_subscriber) - ctx.session._notification_cleanup_registered = True # type: ignore[attr-defined] # ty:ignore[unresolved-attribute] + connection.exit_stack.push_async_callback(_cleanup_subscriber) + connection.state["_notification_cleanup_registered"] = True except Exception as e: # Non-fatal: elicitation will still work via polling fallback logger.debug("Failed to start notification subscriber: %s", e) # Return CreateTaskResult with proper Task object # Tasks MUST begin in "working" status per SEP-1686 final spec (line 381) - return mcp.types.CreateTaskResult( - task=mcp.types.Task( - taskId=server_task_id, + return mcp_types.CreateTaskResult( + task=mcp_types.Task( + task_id=server_task_id, status="working", - createdAt=created_at, - lastUpdatedAt=created_at, + created_at=created_at_iso, + last_updated_at=created_at_iso, ttl=ttl_ms, - pollInterval=poll_interval_ms, + poll_interval=poll_interval_ms, ) ) diff --git a/fastmcp_slim/fastmcp/server/tasks/notifications.py b/fastmcp_slim/fastmcp/server/tasks/notifications.py index dcd3cbd8e..9a662cd95 100644 --- a/fastmcp_slim/fastmcp/server/tasks/notifications.py +++ b/fastmcp_slim/fastmcp/server/tasks/notifications.py @@ -25,7 +25,7 @@ from contextlib import suppress from datetime import datetime, timezone from typing import TYPE_CHECKING, Any -import mcp.types +import mcp_types if TYPE_CHECKING: from docket import Docket @@ -186,16 +186,20 @@ async def _send_mcp_notification( if method != "notifications/tasks/status": raise ValueError(f"Unsupported notification method for subscriber: {method}") - notification = mcp.types.TaskStatusNotification.model_validate( + # SDK v2: a notification's `_meta` lives on its params (`params._meta`), not + # at the notification envelope level, so nest it under params before parsing. + params_dict = dict(notification_dict.get("params", {})) + meta_dict = notification_dict.get("_meta") + if meta_dict is not None: + params_dict["_meta"] = meta_dict + notification = mcp_types.TaskStatusNotification.model_validate( { "method": "notifications/tasks/status", - "params": notification_dict.get("params", {}), - "_meta": notification_dict.get("_meta"), + "params": params_dict, } ) - server_notification = mcp.types.ServerNotification(notification) - - await session.send_notification(server_notification) + # SDK v2: `ServerNotification` is a union type; send the bare model. + await session.send_notification(notification) # type: ignore[arg-type] # ty:ignore[invalid-argument-type] # If this is an input_required notification with elicitation metadata, # relay the elicitation to the client via standard elicitation/create diff --git a/fastmcp_slim/fastmcp/server/tasks/requests.py b/fastmcp_slim/fastmcp/server/tasks/requests.py index 474f166cc..0cbc77aca 100644 --- a/fastmcp_slim/fastmcp/server/tasks/requests.py +++ b/fastmcp_slim/fastmcp/server/tasks/requests.py @@ -11,14 +11,13 @@ from __future__ import annotations from datetime import datetime, timedelta, timezone from typing import TYPE_CHECKING, Any, Literal -import mcp.types +import mcp_types from docket.execution import ExecutionState -from mcp.shared.exceptions import McpError -from mcp.types import ( +from mcp.shared.exceptions import MCPError +from mcp_types import ( INTERNAL_ERROR, INVALID_PARAMS, CancelTaskResult, - ErrorData, GetTaskResult, ListTasksResult, ) @@ -50,6 +49,21 @@ DOCKET_TO_MCP_STATE: dict[ExecutionState, str] = { } +def _normalize_iso_timestamp(stored: str | None) -> str: + """Return an ISO 8601 timestamp string for a Task's createdAt/lastUpdatedAt. + + The v2 Task model types these fields as ISO 8601 strings. `stored` is the + value read from Redis (already an ISO string) or None; either way this + returns a valid ISO string, falling back to the current UTC time. + """ + if stored: + try: + return datetime.fromisoformat(stored.replace("Z", "+00:00")).isoformat() + except (ValueError, AttributeError): + pass + return datetime.now(timezone.utc).isoformat() + + def _parse_key_version(key_suffix: str) -> tuple[str, str | None]: """Parse a key suffix into (name_or_uri, version). @@ -88,7 +102,7 @@ async def _lookup_task_execution( Tuple of (execution, created_at, poll_interval_ms) Raises: - McpError: If task not found or execution not found + MCPError: If task not found or execution not found """ prefix = task_redis_prefix(task_scope) task_meta_key = docket.key(f"{prefix}:{client_task_id}") @@ -104,18 +118,14 @@ async def _lookup_task_execution( # Decode and validate task_key task_key = task_key_bytes.decode("utf-8") if task_key_bytes else None if not task_key: - raise McpError( - ErrorData(code=INVALID_PARAMS, message=f"Task {client_task_id} not found") - ) + raise MCPError(code=INVALID_PARAMS, message=f"Task {client_task_id} not found") # Get execution execution = await docket.get_execution(task_key) if not execution: - raise McpError( - ErrorData( - code=INVALID_PARAMS, - message=f"Task {client_task_id} execution not found", - ) + raise MCPError( + code=INVALID_PARAMS, + message=f"Task {client_task_id} execution not found", ) # Parse metadata with defaults @@ -145,10 +155,8 @@ async def tasks_get_handler(server: FastMCP, params: dict[str, Any]) -> GetTaskR async with fastmcp.server.context.Context(fastmcp=server): client_task_id = params.get("taskId") if not client_task_id: - raise McpError( - ErrorData( - code=INVALID_PARAMS, message="Missing required parameter: taskId" - ) + raise MCPError( + code=INVALID_PARAMS, message="Missing required parameter: taskId" ) # Get authorization scope for task lookup @@ -157,11 +165,9 @@ async def tasks_get_handler(server: FastMCP, params: dict[str, Any]) -> GetTaskR # Get Docket instance docket = server._docket if docket is None: - raise McpError( - ErrorData( - code=INTERNAL_ERROR, - message="Background tasks require Docket", - ) + raise MCPError( + code=INTERNAL_ERROR, + message="Background tasks require Docket", ) # Look up task execution and metadata @@ -194,26 +200,19 @@ async def tasks_get_handler(server: FastMCP, params: dict[str, Any]) -> GetTaskR # Extract progress message from Docket if available (spec line 403) status_message = execution.progress.message - # createdAt is required per spec, but can be None from Redis - # Parse ISO string to datetime, or use current time as fallback - if created_at: - try: - created_at_dt = datetime.fromisoformat( - created_at.replace("Z", "+00:00") - ) - except (ValueError, AttributeError): - created_at_dt = datetime.now(timezone.utc) - else: - created_at_dt = datetime.now(timezone.utc) + # createdAt is required per spec, but can be None from Redis. The v2 + # Task model types createdAt/lastUpdatedAt as ISO 8601 strings, so + # normalize the stored value (or fall back to now) to an ISO string. + created_at_iso = _normalize_iso_timestamp(created_at) return GetTaskResult( - taskId=client_task_id, + task_id=client_task_id, status=mcp_state, - createdAt=created_at_dt, - lastUpdatedAt=datetime.now(timezone.utc), + created_at=created_at_iso, + last_updated_at=datetime.now(timezone.utc).isoformat(), ttl=DEFAULT_TTL_MS, - pollInterval=poll_interval_ms, - statusMessage=status_message, + poll_interval=poll_interval_ms, + status_message=status_message, ) @@ -232,10 +231,8 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: async with fastmcp.server.context.Context(fastmcp=server): client_task_id = params.get("taskId") if not client_task_id: - raise McpError( - ErrorData( - code=INVALID_PARAMS, message="Missing required parameter: taskId" - ) + raise MCPError( + code=INVALID_PARAMS, message="Missing required parameter: taskId" ) # Get authorization scope for task lookup @@ -244,11 +241,9 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: # Get execution from Docket (use instance attribute for cross-task access) docket = server._docket if docket is None: - raise McpError( - ErrorData( - code=INTERNAL_ERROR, - message="Background tasks require Docket", - ) + raise MCPError( + code=INTERNAL_ERROR, + message="Background tasks require Docket", ) # Look up full task key from Redis @@ -259,20 +254,16 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: task_key = None if task_key_bytes is None else task_key_bytes.decode("utf-8") if task_key is None: - raise McpError( - ErrorData( - code=INVALID_PARAMS, - message=f"Invalid taskId: {client_task_id} not found", - ) + raise MCPError( + code=INVALID_PARAMS, + message=f"Invalid taskId: {client_task_id} not found", ) execution = await docket.get_execution(task_key) if execution is None: - raise McpError( - ErrorData( - code=INVALID_PARAMS, - message=f"Invalid taskId: {client_task_id} not found", - ) + raise MCPError( + code=INVALID_PARAMS, + message=f"Invalid taskId: {client_task_id} not found", ) # Sync state from Redis @@ -282,11 +273,9 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: state_map = DOCKET_TO_MCP_STATE if execution.state not in (ExecutionState.COMPLETED, ExecutionState.FAILED): mcp_state = state_map.get(execution.state, "failed") - raise McpError( - ErrorData( - code=INVALID_PARAMS, - message=f"Task not completed yet (current state: {mcp_state})", - ) + raise MCPError( + code=INVALID_PARAMS, + message=f"Task not completed yet (current state: {mcp_state})", ) # Get result from Docket @@ -294,9 +283,9 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: raw_value = await execution.get_result(timeout=timedelta(seconds=0)) except Exception as error: # Task failed - return error result - return mcp.types.CallToolResult( - content=[mcp.types.TextContent(type="text", text=str(error))], - isError=True, + return mcp_types.CallToolResult( + content=[mcp_types.TextContent(type="text", text=str(error))], + is_error=True, _meta={ # type: ignore[call-arg] # _meta is Pydantic alias for meta field "io.modelcontextprotocol/related-task": { "taskId": client_task_id, @@ -331,11 +320,9 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: component = None if component is None: - raise McpError( - ErrorData( - code=INTERNAL_ERROR, - message=f"Component not found for task: {component_key}", - ) + raise MCPError( + code=INTERNAL_ERROR, + message=f"Component not found for task: {component_key}", ) # Build related-task metadata @@ -351,18 +338,18 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: if isinstance(component, Tool): fastmcp_result = component.convert_result(raw_value) mcp_result = fastmcp_result.to_mcp_result() - if isinstance(mcp_result, mcp.types.CallToolResult): + if isinstance(mcp_result, mcp_types.CallToolResult): merged = {**(mcp_result.meta or {}), **related_task_meta} mcp_result._meta = merged # type: ignore[attr-defined] # ty:ignore[unresolved-attribute] elif isinstance(mcp_result, tuple): content, structured_content = mcp_result - mcp_result = mcp.types.CallToolResult( + mcp_result = mcp_types.CallToolResult( content=content, - structuredContent=structured_content, + structured_content=structured_content, _meta=related_task_meta, # type: ignore[call-arg] # _meta is Pydantic alias for meta field ) else: - mcp_result = mcp.types.CallToolResult( + mcp_result = mcp_types.CallToolResult( content=mcp_result, _meta=related_task_meta, # type: ignore[call-arg] # _meta is Pydantic alias for meta field ) @@ -390,11 +377,9 @@ async def tasks_result_handler(server: FastMCP, params: dict[str, Any]) -> Any: return mcp_result else: - raise McpError( - ErrorData( - code=INTERNAL_ERROR, - message=f"Internal error: Unknown component type: {type(component).__name__}", - ) + raise MCPError( + code=INTERNAL_ERROR, + message=f"Internal error: Unknown component type: {type(component).__name__}", ) @@ -413,7 +398,7 @@ async def tasks_list_handler( ListTasksResult: Response with tasks list and pagination """ # Return empty list - client tracks tasks locally - return ListTasksResult(tasks=[], nextCursor=None) + return ListTasksResult(tasks=[], next_cursor=None) async def tasks_cancel_handler( @@ -433,10 +418,8 @@ async def tasks_cancel_handler( async with fastmcp.server.context.Context(fastmcp=server): client_task_id = params.get("taskId") if not client_task_id: - raise McpError( - ErrorData( - code=INVALID_PARAMS, message="Missing required parameter: taskId" - ) + raise MCPError( + code=INVALID_PARAMS, message="Missing required parameter: taskId" ) # Get authorization scope for task lookup @@ -445,11 +428,9 @@ async def tasks_cancel_handler( # Get Docket instance docket = server._docket if docket is None: - raise McpError( - ErrorData( - code=INTERNAL_ERROR, - message="Background tasks require Docket", - ) + raise MCPError( + code=INTERNAL_ERROR, + message="Background tasks require Docket", ) # Look up task execution and metadata @@ -465,13 +446,11 @@ async def tasks_cancel_handler( # createdAt is REQUIRED per SEP-1686 final spec (line 430) # Per spec lines 447-448: SHOULD NOT include related-task metadata in tasks/cancel return CancelTaskResult( - taskId=client_task_id, + task_id=client_task_id, status="cancelled", - createdAt=datetime.fromisoformat(created_at) - if created_at - else datetime.now(timezone.utc), - lastUpdatedAt=datetime.now(timezone.utc), + created_at=_normalize_iso_timestamp(created_at), + last_updated_at=datetime.now(timezone.utc).isoformat(), ttl=DEFAULT_TTL_MS, - pollInterval=poll_interval_ms, - statusMessage="Task cancelled", + poll_interval=poll_interval_ms, + status_message="Task cancelled", ) diff --git a/fastmcp_slim/fastmcp/server/tasks/routing.py b/fastmcp_slim/fastmcp/server/tasks/routing.py index cb6812a87..97839eff3 100644 --- a/fastmcp_slim/fastmcp/server/tasks/routing.py +++ b/fastmcp_slim/fastmcp/server/tasks/routing.py @@ -7,9 +7,9 @@ from __future__ import annotations from typing import TYPE_CHECKING, Any, Literal -import mcp.types -from mcp.shared.exceptions import McpError -from mcp.types import METHOD_NOT_FOUND, ErrorData +import mcp_types +from mcp.shared.exceptions import MCPError +from mcp_types import METHOD_NOT_FOUND from fastmcp.server.tasks.config import TaskMeta from fastmcp.server.tasks.handlers import submit_to_docket @@ -28,7 +28,7 @@ async def check_background_task( task_type: TaskType, arguments: dict[str, Any] | None = None, task_meta: TaskMeta | None = None, -) -> mcp.types.CreateTaskResult | None: +) -> mcp_types.CreateTaskResult | None: """Check task mode and submit to background if requested. Args: @@ -41,7 +41,7 @@ async def check_background_task( CreateTaskResult if submitted to docket, None for sync execution Raises: - McpError: If mode="required" but no task metadata, or mode="forbidden" + MCPError: If mode="required" but no task metadata, or mode="forbidden" but task metadata is present """ task_config = component.task_config @@ -51,20 +51,16 @@ async def check_background_task( # Enforce mode="required" - must have task metadata if task_config.mode == "required" and not task_meta: - raise McpError( - ErrorData( - code=METHOD_NOT_FOUND, - message=f"{entity_label} requires task-augmented execution", - ) + raise MCPError( + code=METHOD_NOT_FOUND, + message=f"{entity_label} requires task-augmented execution", ) # Enforce mode="forbidden" - cannot be called with task metadata if not task_config.supports_tasks() and task_meta: - raise McpError( - ErrorData( - code=METHOD_NOT_FOUND, - message=f"{entity_label} does not support task-augmented execution", - ) + raise MCPError( + code=METHOD_NOT_FOUND, + message=f"{entity_label} does not support task-augmented execution", ) # No task metadata - synchronous execution diff --git a/fastmcp_slim/fastmcp/server/tasks/subscriptions.py b/fastmcp_slim/fastmcp/server/tasks/subscriptions.py index 37a4bf2ea..c116bd1bb 100644 --- a/fastmcp_slim/fastmcp/server/tasks/subscriptions.py +++ b/fastmcp_slim/fastmcp/server/tasks/subscriptions.py @@ -13,7 +13,7 @@ from datetime import datetime, timezone from typing import TYPE_CHECKING from docket.execution import ExecutionState -from mcp.types import TaskStatusNotification, TaskStatusNotificationParams +from mcp_types import TaskStatusNotification, TaskStatusNotificationParams from fastmcp.server.tasks.config import DEFAULT_TTL_MS from fastmcp.server.tasks.keys import parse_task_key, task_redis_prefix diff --git a/fastmcp_slim/fastmcp/server/telemetry.py b/fastmcp_slim/fastmcp/server/telemetry.py index 974d4dcf6..d7e62540d 100644 --- a/fastmcp_slim/fastmcp/server/telemetry.py +++ b/fastmcp_slim/fastmcp/server/telemetry.py @@ -3,7 +3,6 @@ from collections.abc import Generator from contextlib import contextmanager -from mcp.server.lowlevel.server import request_ctx from opentelemetry.context import Context from opentelemetry.trace import Span, SpanKind, Status, StatusCode @@ -44,12 +43,11 @@ def get_session_span_attributes() -> dict[str, str]: def _get_parent_trace_context() -> Context | None: """Get parent trace context from request meta for distributed tracing.""" - try: - req_ctx = request_ctx.get() - if req_ctx and hasattr(req_ctx, "meta") and req_ctx.meta: - return extract_trace_context(dict(req_ctx.meta)) - except LookupError: - pass + from fastmcp.server.dependencies import fastmcp_request_ctx + + req_ctx = fastmcp_request_ctx.get() + if req_ctx is not None and req_ctx.meta: + return extract_trace_context(req_ctx.meta) return None diff --git a/fastmcp_slim/fastmcp/server/transforms/prompts_as_tools.py b/fastmcp_slim/fastmcp/server/transforms/prompts_as_tools.py index 2caa13c0f..81c421bc3 100644 --- a/fastmcp_slim/fastmcp/server/transforms/prompts_as_tools.py +++ b/fastmcp_slim/fastmcp/server/transforms/prompts_as_tools.py @@ -24,7 +24,7 @@ import json from collections.abc import Sequence from typing import TYPE_CHECKING, Annotated, Any -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp.server.dependencies import get_context from fastmcp.server.transforms import GetToolNext, Transform @@ -157,7 +157,9 @@ def _format_prompt_result(result: Any) -> str: if isinstance(msg.content, TextContent): content = msg.content.text else: - content = msg.content.model_dump(mode="json", exclude_none=True) + content = msg.content.model_dump( + mode="json", by_alias=True, exclude_none=True + ) messages.append( { diff --git a/fastmcp_slim/fastmcp/server/transforms/resources_as_tools.py b/fastmcp_slim/fastmcp/server/transforms/resources_as_tools.py index 2b0350205..9861fc6c9 100644 --- a/fastmcp_slim/fastmcp/server/transforms/resources_as_tools.py +++ b/fastmcp_slim/fastmcp/server/transforms/resources_as_tools.py @@ -25,14 +25,14 @@ import json from collections.abc import Sequence from typing import TYPE_CHECKING, Annotated, Any -from mcp.types import ToolAnnotations +from mcp_types import ToolAnnotations from fastmcp.server.dependencies import get_context from fastmcp.server.transforms import GetToolNext, Transform from fastmcp.tools.base import Tool from fastmcp.utilities.versions import VersionSpec -_DEFAULT_ANNOTATIONS = ToolAnnotations(readOnlyHint=True) +_DEFAULT_ANNOTATIONS = ToolAnnotations(read_only_hint=True) if TYPE_CHECKING: from fastmcp.server.providers.base import Provider diff --git a/fastmcp_slim/fastmcp/server/transforms/search/base.py b/fastmcp_slim/fastmcp/server/transforms/search/base.py index 7368d62f5..cfeac6909 100644 --- a/fastmcp_slim/fastmcp/server/transforms/search/base.py +++ b/fastmcp_slim/fastmcp/server/transforms/search/base.py @@ -60,7 +60,8 @@ def _extract_searchable_text(tool: Tool) -> str: def serialize_tools_for_output_json(tools: Sequence[Tool]) -> list[dict[str, Any]]: """Serialize tools to the same dict format as ``list_tools`` output.""" return [ - tool.to_mcp_tool().model_dump(mode="json", exclude_none=True) for tool in tools + tool.to_mcp_tool().model_dump(mode="json", by_alias=True, exclude_none=True) + for tool in tools ] diff --git a/fastmcp_slim/fastmcp/server/transforms/visibility.py b/fastmcp_slim/fastmcp/server/transforms/visibility.py index e95fd5845..d294d49ef 100644 --- a/fastmcp_slim/fastmcp/server/transforms/visibility.py +++ b/fastmcp_slim/fastmcp/server/transforms/visibility.py @@ -10,7 +10,7 @@ from __future__ import annotations from collections.abc import Sequence from typing import TYPE_CHECKING, Any, Literal, TypeVar -import mcp.types +import mcp_types from fastmcp.resources.base import Resource from fastmcp.resources.template import ResourceTemplate @@ -322,11 +322,11 @@ async def save_visibility_rules( # Send notifications based on components hint # Note: MCP has no separate template notification - templates use ResourceListChangedNotification if components is None or "tool" in components: - await context.send_notification(mcp.types.ToolListChangedNotification()) + await context.send_notification(mcp_types.ToolListChangedNotification()) if components is None or "resource" in components or "template" in components: - await context.send_notification(mcp.types.ResourceListChangedNotification()) + await context.send_notification(mcp_types.ResourceListChangedNotification()) if components is None or "prompt" in components: - await context.send_notification(mcp.types.PromptListChangedNotification()) + await context.send_notification(mcp_types.PromptListChangedNotification()) def create_visibility_transforms(rules: list[dict[str, Any]]) -> list[Visibility]: diff --git a/fastmcp_slim/fastmcp/settings.py b/fastmcp_slim/fastmcp/settings.py index 19340e73b..9709f9ec8 100644 --- a/fastmcp_slim/fastmcp/settings.py +++ b/fastmcp_slim/fastmcp/settings.py @@ -224,6 +224,22 @@ class Settings(BaseSettings): ), ] = True + mcp_camelcase_compat: Annotated[ + bool, + Field( + description=inspect.cleandoc( + """ + Whether to install compatibility shims that let legacy + camelCase reads on MCP SDK objects (e.g. `tool.inputSchema`, + `result.isError`) keep working after the SDK v2 rename to + snake_case. Each bridged read emits a + `FastMCPDeprecationWarning`. Set to False to disable the shims + entirely, in which case only the snake_case names resolve. + """ + ), + ), + ] = True + client_raise_first_exceptiongroup_error: Annotated[ bool, Field( diff --git a/fastmcp_slim/fastmcp/tools/base.py b/fastmcp_slim/fastmcp/tools/base.py index 614649481..879a5050f 100644 --- a/fastmcp_slim/fastmcp/tools/base.py +++ b/fastmcp_slim/fastmcp/tools/base.py @@ -11,10 +11,10 @@ from typing import ( overload, ) -import mcp.types +import mcp_types import pydantic_core from mcp.shared.tool_name_validation import validate_and_warn_tool_name -from mcp.types import ( +from mcp_types import ( CallToolResult, ContentBlock, Icon, @@ -22,7 +22,7 @@ from mcp.types import ( ToolAnnotations, ToolExecution, ) -from mcp.types import Tool as MCPTool +from mcp_types import Tool as MCPTool from pydantic import BaseModel, Field, model_validator from pydantic.json_schema import SkipJsonSchema @@ -105,7 +105,7 @@ class ToolResult(BaseModel): is_error: bool = Field( default=False, description="Whether this result represents a tool execution error. " - "When True, it maps to CallToolResult.isError so the error is returned " + "When True, it maps to CallToolResult.is_error so the error is returned " "to the client rather than raised.", ) @@ -167,9 +167,9 @@ class ToolResult(BaseModel): # reaches the client; the plain content/tuple returns can't carry it. if self.meta is not None or self.is_error: return CallToolResult( - structuredContent=self.structured_content, + structured_content=self.structured_content, content=self.content, - isError=self.is_error, + is_error=self.is_error, _meta=self.meta, # type: ignore[call-arg] # _meta is Pydantic alias for meta field ) if self.structured_content is None: @@ -235,8 +235,8 @@ class Tool(FastMCPComponent): name=overrides.get("name", self.name), title=overrides.get("title", title), description=overrides.get("description", self.description), - inputSchema=overrides.get("inputSchema", self.parameters), - outputSchema=overrides.get("outputSchema", self.output_schema), + input_schema=overrides.get("inputSchema", self.parameters), + output_schema=overrides.get("outputSchema", self.output_schema), icons=overrides.get("icons", self.icons), annotations=overrides.get("annotations", self.annotations), execution=overrides.get("execution", self.execution), @@ -250,7 +250,7 @@ class Tool(FastMCPComponent): and "execution" not in overrides and not self.execution ): - mcp_tool.execution = ToolExecution(taskSupport=self.task_config.mode) + mcp_tool.execution = ToolExecution(task_support=self.task_config.mode) return mcp_tool @@ -380,13 +380,13 @@ class Tool(FastMCPComponent): self, arguments: dict[str, Any], task_meta: TaskMeta, - ) -> mcp.types.CreateTaskResult: ... + ) -> mcp_types.CreateTaskResult: ... async def _run( self, arguments: dict[str, Any], task_meta: TaskMeta | None = None, - ) -> ToolResult | mcp.types.CreateTaskResult: + ) -> ToolResult | mcp_types.CreateTaskResult: """Server entry point that handles task routing. This allows ANY Tool subclass to support background execution by setting diff --git a/fastmcp_slim/fastmcp/tools/function_parsing.py b/fastmcp_slim/fastmcp/tools/function_parsing.py index 3024199fd..054ed9815 100644 --- a/fastmcp_slim/fastmcp/tools/function_parsing.py +++ b/fastmcp_slim/fastmcp/tools/function_parsing.py @@ -9,7 +9,7 @@ from collections.abc import Callable from dataclasses import dataclass from typing import Annotated, Any, Generic, Union, get_args, get_origin, get_type_hints -import mcp.types +import mcp_types from pydantic import BaseModel, PydanticSchemaGenerationError from typing_extensions import TypeVar as TypeVarExt @@ -317,11 +317,11 @@ class ParsedFunction: Audio, File, ToolResult, - mcp.types.TextContent, - mcp.types.ImageContent, - mcp.types.AudioContent, - mcp.types.ResourceLink, - mcp.types.EmbeddedResource, + mcp_types.TextContent, + mcp_types.ImageContent, + mcp_types.AudioContent, + mcp_types.ResourceLink, + mcp_types.EmbeddedResource, *_PREFAB_TYPES, ), _UnserializableType, diff --git a/fastmcp_slim/fastmcp/tools/function_tool.py b/fastmcp_slim/fastmcp/tools/function_tool.py index 7e965ef9b..e83fd1791 100644 --- a/fastmcp_slim/fastmcp/tools/function_tool.py +++ b/fastmcp_slim/fastmcp/tools/function_tool.py @@ -24,8 +24,8 @@ from typing import ( ) import anyio -from mcp.shared.exceptions import McpError -from mcp.types import ErrorData, Icon, ToolAnnotations +from mcp.shared.exceptions import MCPError +from mcp_types import Icon, ToolAnnotations from pydantic import Field, TypeAdapter from pydantic import ValidationError as PydanticValidationError from pydantic.json_schema import SkipJsonSchema @@ -127,6 +127,21 @@ def _wrap_body_errors(fn: Callable[..., Any]) -> Callable[..., Any]: return wrapper +def _strict_input_validation() -> bool: + """Whether the running server enforces strict argument validation. + + Reads ``strict_input_validation`` off the active request's ``FastMCP`` + instance. Returns ``False`` outside a request context (e.g. a tool invoked + directly in tests), preserving the default coercing behavior. + """ + from fastmcp.server.context import _current_context + + context = _current_context.get(None) + if context is None: + return False + return context.fastmcp.strict_input_validation + + F = TypeVar("F", bound=Callable[..., Any]) @@ -394,13 +409,14 @@ class FunctionTool(Tool): exec_fn = _wrap_body_errors(wrapper_fn) type_adapter = get_cached_typeadapter(exec_fn) exec_is_async = is_coroutine_function(wrapper_fn) + strict = _strict_input_validation() try: if self.timeout is not None: try: with anyio.fail_after(self.timeout): result = await self._execute( - type_adapter, exec_is_async, arguments + type_adapter, exec_is_async, arguments, strict=strict ) except TimeoutError: logger.warning( @@ -408,14 +424,14 @@ class FunctionTool(Tool): f"Consider using task=True for long-running operations. " f"See https://gofastmcp.com/servers/tasks" ) - raise McpError( - ErrorData( - code=-32000, - message=f"Tool '{self.name}' execution timed out after {self.timeout}s", - ) + raise MCPError( + code=-32000, + message=f"Tool '{self.name}' execution timed out after {self.timeout}s", ) from None else: - result = await self._execute(type_adapter, exec_is_async, arguments) + result = await self._execute( + type_adapter, exec_is_async, arguments, strict=strict + ) except PydanticValidationError as e: # Body errors are re-raised as _ToolBodyError, so a bare pydantic # ValidationError here is an argument-validation failure (a bad call). @@ -438,6 +454,8 @@ class FunctionTool(Tool): type_adapter: TypeAdapter[Any], exec_is_async: bool, arguments: dict[str, Any], + *, + strict: bool = False, ) -> Any: """Validate arguments and execute the tool body. @@ -445,20 +463,24 @@ class FunctionTool(Tool): ``pydantic.ValidationError`` on bad input. Body execution (awaiting the result and materializing generators) is wrapped so any pydantic error it raises is tagged as ``_ToolBodyError``. + + When ``strict`` is set (server-level ``strict_input_validation``), + pydantic validates in strict mode, so lax coercions such as the JSON + string ``"10"`` into an ``int`` are rejected rather than coerced. """ # Combining timeout with run_in_thread=False on a sync function is # rejected at registration (see FunctionTool.from_function), so this only # needs to handle async and threadpool-sync under a timeout. if exec_is_async: # Argument validation is synchronous; the body runs on await below. - result = type_adapter.validate_python(arguments) + result = type_adapter.validate_python(arguments, strict=strict) elif self.run_in_thread: # Sync function: run in threadpool to avoid blocking the event loop. result = await call_sync_fn_in_threadpool( - type_adapter.validate_python, arguments + type_adapter.validate_python, arguments, strict=strict ) else: - result = type_adapter.validate_python(arguments) + result = type_adapter.validate_python(arguments, strict=strict) try: if inspect.isawaitable(result): @@ -521,7 +543,9 @@ class FunctionTool(Tool): kwargs["key"] = task_key return await docket.add(lookup_key, **kwargs)(**arguments) - def coerce_task_arguments(self, arguments: dict[str, Any]) -> dict[str, Any]: + def coerce_task_arguments( + self, arguments: dict[str, Any], *, strict: bool = False + ) -> dict[str, Any]: """Validate client arguments against their declared parameter types. The synchronous ``run()`` path validates arguments through the @@ -534,6 +558,11 @@ class FunctionTool(Tool): task state is created. Coerced values survive the trip to the worker because Docket serializes task arguments with cloudpickle. + ``strict`` mirrors the synchronous path's ``strict_input_validation`` + handling: when set, arguments are validated in strict mode so lax + coercions (e.g. the string ``"1"`` into an ``int``) are rejected at + submission rather than silently coerced and queued. + Injected dependency parameters (Context, Depends()) are excluded via the same wrapper used by the synchronous path, so only client-supplied arguments are coerced and Docket's dependency resolution is untouched. @@ -552,7 +581,7 @@ class FunctionTool(Tool): continue adapter = get_cached_typeadapter(annotation) try: - coerced[name] = adapter.validate_python(value) + coerced[name] = adapter.validate_python(value, strict=strict) except PydanticValidationError as e: # Argument coercion failure on the task path is a bad call, just # like the synchronous path — surface it as fastmcp's diff --git a/fastmcp_slim/fastmcp/tools/tool_transform.py b/fastmcp_slim/fastmcp/tools/tool_transform.py index 3d6697fc5..d43365dc2 100644 --- a/fastmcp_slim/fastmcp/tools/tool_transform.py +++ b/fastmcp_slim/fastmcp/tools/tool_transform.py @@ -9,7 +9,7 @@ from dataclasses import dataclass from typing import Annotated, Any, Literal, cast import pydantic_core -from mcp.types import ToolAnnotations +from mcp_types import ToolAnnotations from pydantic import ConfigDict from pydantic.fields import Field from pydantic.functional_validators import BeforeValidator diff --git a/fastmcp_slim/fastmcp/types.py b/fastmcp_slim/fastmcp/types.py index 5d9e30cc7..4b33e7cb2 100644 --- a/fastmcp_slim/fastmcp/types.py +++ b/fastmcp_slim/fastmcp/types.py @@ -22,6 +22,84 @@ from __future__ import annotations from typing import Annotated +from mcp_types import ( + Annotations as Annotations, +) +from mcp_types import ( + AudioContent as AudioContent, +) +from mcp_types import ( + BlobResourceContents as BlobResourceContents, +) +from mcp_types import ( + CallToolResult as CallToolResult, +) +from mcp_types import ( + Completion as Completion, +) +from mcp_types import ( + ContentBlock as ContentBlock, +) +from mcp_types import ( + CreateMessageResult as CreateMessageResult, +) +from mcp_types import ( + EmbeddedResource as EmbeddedResource, +) +from mcp_types import ( + ErrorData as ErrorData, +) +from mcp_types import ( + GetPromptResult as GetPromptResult, +) +from mcp_types import ( + Icon as Icon, +) +from mcp_types import ( + ImageContent as ImageContent, +) +from mcp_types import ( + Prompt as Prompt, +) +from mcp_types import ( + PromptMessage as PromptMessage, +) +from mcp_types import ( + ReadResourceResult as ReadResourceResult, +) +from mcp_types import ( + Resource as Resource, +) +from mcp_types import ( + ResourceLink as ResourceLink, +) +from mcp_types import ( + ResourceTemplate as ResourceTemplate, +) +from mcp_types import ( + Root as Root, +) +from mcp_types import ( + SamplingCapability as SamplingCapability, +) +from mcp_types import ( + SamplingMessage as SamplingMessage, +) +from mcp_types import ( + TextContent as TextContent, +) +from mcp_types import ( + TextResourceContents as TextResourceContents, +) +from mcp_types import ( + Tool as Tool, +) +from mcp_types import ( + ToolAnnotations as ToolAnnotations, +) +from mcp_types import ( + ToolResultContent as ToolResultContent, +) from pydantic import Field Textarea = Annotated[str, Field(json_schema_extra={"format": "textarea"})] @@ -31,4 +109,32 @@ Produces `"format": "textarea"` in the JSON Schema, which `fastmcp dev apps` picks up automatically. """ -__all__ = ["Textarea"] +__all__ = [ + "Annotations", + "AudioContent", + "BlobResourceContents", + "CallToolResult", + "Completion", + "ContentBlock", + "CreateMessageResult", + "EmbeddedResource", + "ErrorData", + "GetPromptResult", + "Icon", + "ImageContent", + "Prompt", + "PromptMessage", + "ReadResourceResult", + "Resource", + "ResourceLink", + "ResourceTemplate", + "Root", + "SamplingCapability", + "SamplingMessage", + "TextContent", + "TextResourceContents", + "Textarea", + "Tool", + "ToolAnnotations", + "ToolResultContent", +] diff --git a/fastmcp_slim/fastmcp/utilities/components.py b/fastmcp_slim/fastmcp/utilities/components.py index d371ca495..0fc8ea4bd 100644 --- a/fastmcp_slim/fastmcp/utilities/components.py +++ b/fastmcp_slim/fastmcp/utilities/components.py @@ -3,7 +3,7 @@ from __future__ import annotations from collections.abc import Sequence from typing import TYPE_CHECKING, Annotated, Any, ClassVar, TypedDict, cast -from mcp.types import Icon +from mcp_types import Icon from pydantic import BeforeValidator, Field from typing_extensions import Self, TypeVar @@ -232,7 +232,9 @@ class FastMCPComponent(FastMCPBaseModel): """ # Base implementation: no-op (subclasses override) - def coerce_task_arguments(self, arguments: dict[str, Any]) -> dict[str, Any]: + def coerce_task_arguments( + self, arguments: dict[str, Any], *, strict: bool = False + ) -> dict[str, Any]: """Validate and coerce task arguments before any task state is created. Called by ``submit_to_docket`` up front, so invalid inputs raise before @@ -242,6 +244,11 @@ class FastMCPComponent(FastMCPBaseModel): components that splat arguments into a typed Python callable (e.g. ``FunctionTool``) override this to mirror the synchronous validation path. + + When ``strict`` is set (server-level ``strict_input_validation``), + overrides validate in strict mode so the task path rejects lax + coercions (e.g. the string ``"1"`` into an ``int``) exactly as the + synchronous call path does. """ return arguments diff --git a/fastmcp_slim/fastmcp/utilities/exceptions.py b/fastmcp_slim/fastmcp/utilities/exceptions.py index a85bbafa7..dfdda672e 100644 --- a/fastmcp_slim/fastmcp/utilities/exceptions.py +++ b/fastmcp_slim/fastmcp/utilities/exceptions.py @@ -2,9 +2,8 @@ from collections.abc import Callable, Iterable, Mapping from typing import Any import httpx -import mcp.types from exceptiongroup import BaseExceptionGroup -from mcp import McpError +from mcp import MCPError import fastmcp @@ -20,11 +19,9 @@ def iter_exc(group: BaseExceptionGroup): def _exception_handler(group: BaseExceptionGroup): for leaf in iter_exc(group): if isinstance(leaf, httpx.ConnectTimeout): - raise McpError( - error=mcp.types.ErrorData( - code=httpx.codes.REQUEST_TIMEOUT, - message="Timed out while waiting for response.", - ) + raise MCPError( + code=httpx.codes.REQUEST_TIMEOUT, + message="Timed out while waiting for response.", ) raise leaf diff --git a/fastmcp_slim/fastmcp/utilities/inspect.py b/fastmcp_slim/fastmcp/utilities/inspect.py index 2e3348e22..b9e3d0827 100644 --- a/fastmcp_slim/fastmcp/utilities/inspect.py +++ b/fastmcp_slim/fastmcp/utilities/inspect.py @@ -8,7 +8,7 @@ from enum import Enum from typing import Any, Literal, cast import pydantic_core -from mcp.server.fastmcp import FastMCP as FastMCP1x +from mcp.server.mcpserver import MCPServer as SDKServer import fastmcp from fastmcp import Client @@ -121,12 +121,15 @@ async def inspect_fastmcp_v2(mcp: FastMCP[Any]) -> FastMCPInfo: key=tool.key, name=tool.name or tool.key, description=tool.description, - input_schema=mcp_tool.inputSchema if mcp_tool.inputSchema else {}, + input_schema=mcp_tool.input_schema if mcp_tool.input_schema else {}, output_schema=tool.output_schema, annotations=tool.annotations.model_dump() if tool.annotations else None, tags=list(tool.tags) if tool.tags else None, title=tool.title, - icons=[icon.model_dump() for icon in tool.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in tool.icons + ] if tool.icons else None, meta=tool.meta, @@ -146,7 +149,10 @@ async def inspect_fastmcp_v2(mcp: FastMCP[Any]) -> FastMCPInfo: else None, tags=list(prompt.tags) if prompt.tags else None, title=prompt.title, - icons=[icon.model_dump() for icon in prompt.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in prompt.icons + ] if prompt.icons else None, meta=prompt.meta, @@ -168,7 +174,10 @@ async def inspect_fastmcp_v2(mcp: FastMCP[Any]) -> FastMCPInfo: else None, tags=list(resource.tags) if resource.tags else None, title=resource.title, - icons=[icon.model_dump() for icon in resource.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in resource.icons + ] if resource.icons else None, meta=resource.meta, @@ -191,7 +200,10 @@ async def inspect_fastmcp_v2(mcp: FastMCP[Any]) -> FastMCPInfo: else None, tags=list(template.tags) if template.tags else None, title=template.title, - icons=[icon.model_dump() for icon in template.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in template.icons + ] if template.icons else None, meta=template.meta, @@ -208,7 +220,10 @@ async def inspect_fastmcp_v2(mcp: FastMCP[Any]) -> FastMCPInfo: # Extract server-level icons and website_url server_icons = ( - [icon.model_dump() for icon in mcp._mcp_server.icons] + [ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in mcp._mcp_server.icons + ] if hasattr(mcp._mcp_server, "icons") and mcp._mcp_server.icons else None ) @@ -233,7 +248,7 @@ async def inspect_fastmcp_v2(mcp: FastMCP[Any]) -> FastMCPInfo: ) -async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: +async def inspect_fastmcp_v1(mcp: SDKServer) -> FastMCPInfo: """Extract information from a FastMCP v1.x instance using a Client. Args: @@ -242,7 +257,7 @@ async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: Returns: FastMCPInfo dataclass containing the extracted information """ - # Use a client to interact with the FastMCP1x server + # Use a client to interact with the SDK's high-level MCPServer async with Client(mcp) as client: # Get components via client calls (these return MCP objects) mcp_tools = await client.list_tools() @@ -263,12 +278,15 @@ async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: key=mcp_tool.name, name=mcp_tool.name, description=mcp_tool.description, - input_schema=mcp_tool.inputSchema if mcp_tool.inputSchema else {}, + input_schema=mcp_tool.input_schema if mcp_tool.input_schema else {}, output_schema=None, # v1 doesn't have output_schema annotations=None, # v1 doesn't have annotations tags=None, # v1 doesn't have tags title=None, # v1 doesn't have title - icons=[icon.model_dump() for icon in mcp_tool.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in mcp_tool.icons + ] if hasattr(mcp_tool, "icons") and mcp_tool.icons else None, meta=None, # v1 doesn't have meta field @@ -291,7 +309,10 @@ async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: arguments=arguments, tags=None, # v1 doesn't have tags title=None, # v1 doesn't have title - icons=[icon.model_dump() for icon in mcp_prompt.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in mcp_prompt.icons + ] if hasattr(mcp_prompt, "icons") and mcp_prompt.icons else None, meta=None, # v1 doesn't have meta field @@ -307,11 +328,14 @@ async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: uri=str(mcp_resource.uri), name=mcp_resource.name, description=mcp_resource.description, - mime_type=mcp_resource.mimeType, + mime_type=mcp_resource.mime_type, annotations=None, # v1 doesn't have annotations tags=None, # v1 doesn't have tags title=None, # v1 doesn't have title - icons=[icon.model_dump() for icon in mcp_resource.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in mcp_resource.icons + ] if hasattr(mcp_resource, "icons") and mcp_resource.icons else None, meta=None, # v1 doesn't have meta field @@ -323,16 +347,19 @@ async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: for mcp_template in mcp_templates: template_infos.append( # noqa: PERF401 TemplateInfo( - key=str(mcp_template.uriTemplate), - uri_template=str(mcp_template.uriTemplate), + key=str(mcp_template.uri_template), + uri_template=str(mcp_template.uri_template), name=mcp_template.name, description=mcp_template.description, - mime_type=mcp_template.mimeType, + mime_type=mcp_template.mime_type, parameters=None, # v1 doesn't expose template parameters annotations=None, # v1 doesn't have annotations tags=None, # v1 doesn't have tags title=None, # v1 doesn't have title - icons=[icon.model_dump() for icon in mcp_template.icons] + icons=[ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in mcp_template.icons + ] if hasattr(mcp_template, "icons") and mcp_template.icons else None, meta=None, # v1 doesn't have meta field @@ -348,20 +375,25 @@ async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: } # Extract server-level icons and website_url from serverInfo - server_info = client.initialize_result.serverInfo + server_info = client.initialize_result.server_info server_icons = ( - [icon.model_dump() for icon in server_info.icons] + [ + icon.model_dump(by_alias=True, exclude_none=True) + for icon in server_info.icons + ] if hasattr(server_info, "icons") and server_info.icons else None ) server_website_url = ( - server_info.websiteUrl if hasattr(server_info, "websiteUrl") else None + server_info.website_url if hasattr(server_info, "website_url") else None ) + # SDK v2's MCPServer (FastMCP 1.x) exposes name/instructions/version + # directly; the v1 `_mcp_server` low-level wrapper attribute is gone. return FastMCPInfo( - name=mcp._mcp_server.name, - instructions=mcp._mcp_server.instructions, - version=mcp._mcp_server.version, + name=mcp.name, + instructions=mcp.instructions, + version=mcp.version, website_url=server_website_url, icons=server_icons, fastmcp_version=fastmcp.__version__, # Version generating this manifest @@ -375,7 +407,7 @@ async def inspect_fastmcp_v1(mcp: FastMCP1x) -> FastMCPInfo: ) -async def inspect_fastmcp(mcp: FastMCP[Any] | FastMCP1x) -> FastMCPInfo: +async def inspect_fastmcp(mcp: FastMCP[Any] | SDKServer) -> FastMCPInfo: """Extract information from a FastMCP instance into a dataclass. This function automatically detects whether the instance is FastMCP v1.x or v2.x @@ -387,7 +419,7 @@ async def inspect_fastmcp(mcp: FastMCP[Any] | FastMCP1x) -> FastMCPInfo: Returns: FastMCPInfo dataclass containing the extracted information """ - if isinstance(mcp, FastMCP1x): + if isinstance(mcp, SDKServer): return await inspect_fastmcp_v1(mcp) else: return await inspect_fastmcp_v2(cast(FastMCP[Any], mcp)) @@ -429,7 +461,7 @@ def format_fastmcp_info(info: FastMCPInfo) -> bytes: return pydantic_core.to_json(result, indent=2) -async def format_mcp_info(mcp: FastMCP[Any] | FastMCP1x) -> bytes: +async def format_mcp_info(mcp: FastMCP[Any] | SDKServer) -> bytes: """Format server info as standard MCP protocol JSON. Uses Client to get the standard MCP protocol format with camelCase fields. @@ -443,7 +475,7 @@ async def format_mcp_info(mcp: FastMCP[Any] | FastMCP1x) -> bytes: templates_result = await client.list_resource_templates_mcp() # Get server info from the initialize result - server_info = client.initialize_result.serverInfo + server_info = client.initialize_result.server_info # Combine into MCP protocol structure with environment metadata result = { @@ -456,14 +488,14 @@ async def format_mcp_info(mcp: FastMCP[Any] | FastMCP1x) -> bytes: "tools": tools_result.tools, "prompts": prompts_result.prompts, "resources": resources_result.resources, - "resourceTemplates": templates_result.resourceTemplates, + "resourceTemplates": templates_result.resource_templates, } return pydantic_core.to_json(result, indent=2) async def format_info( - mcp: FastMCP[Any] | FastMCP1x, + mcp: FastMCP[Any] | SDKServer, format: InspectFormat | Literal["fastmcp", "mcp"], info: FastMCPInfo | None = None, ) -> bytes: diff --git a/fastmcp_slim/fastmcp/utilities/mcp_server_config/v1/sources/filesystem.py b/fastmcp_slim/fastmcp/utilities/mcp_server_config/v1/sources/filesystem.py index f94dc7c97..2e865f85c 100644 --- a/fastmcp_slim/fastmcp/utilities/mcp_server_config/v1/sources/filesystem.py +++ b/fastmcp_slim/fastmcp/utilities/mcp_server_config/v1/sources/filesystem.py @@ -117,7 +117,7 @@ class FileSystemSource(Source): The server object (or result of calling a factory function) """ # Avoid circular import by importing here - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.server.server import FastMCP @@ -154,7 +154,7 @@ class FileSystemSource(Source): for name in ["mcp", "server", "app"]: if hasattr(module, name): obj = getattr(module, name) - if isinstance(obj, FastMCP | FastMCP1x): + if isinstance(obj, FastMCP | SDKServer): return await self._resolve_factory(obj, file_path, name) # No server found @@ -178,7 +178,7 @@ class FileSystemSource(Source): A server instance """ # Avoid circular import by importing here - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.server.server import FastMCP @@ -195,7 +195,7 @@ class FileSystemSource(Source): server = obj() # Validate the result is a FastMCP server - if not isinstance(server, FastMCP | FastMCP1x): + if not isinstance(server, FastMCP | SDKServer): logger.error( f"Factory function '{name}' must return a FastMCP server instance, " f"got {type(server).__name__}", diff --git a/fastmcp_slim/fastmcp/utilities/skills.py b/fastmcp_slim/fastmcp/utilities/skills.py index 49b13d859..2c93b1f7f 100644 --- a/fastmcp_slim/fastmcp/utilities/skills.py +++ b/fastmcp_slim/fastmcp/utilities/skills.py @@ -8,7 +8,7 @@ from dataclasses import dataclass from pathlib import Path from typing import TYPE_CHECKING -import mcp.types +import mcp_types if TYPE_CHECKING: from fastmcp.client import Client @@ -104,7 +104,7 @@ async def get_skill_manifest(client: Client, skill_name: str) -> SkillManifest: raise ValueError(f"Could not read manifest for skill: {skill_name}") content = result[0] - if isinstance(content, mcp.types.TextResourceContents): + if isinstance(content, mcp_types.TextResourceContents): try: manifest_data = json.loads(content.text) except json.JSONDecodeError as e: @@ -204,9 +204,9 @@ async def download_skill( file_path.parent.mkdir(parents=True, exist_ok=True) # Write content - if isinstance(content, mcp.types.TextResourceContents): + if isinstance(content, mcp_types.TextResourceContents): file_path.write_text(content.text) - elif isinstance(content, mcp.types.BlobResourceContents): + elif isinstance(content, mcp_types.BlobResourceContents): file_path.write_bytes(base64.b64decode(content.blob)) else: # Skip unknown content types diff --git a/fastmcp_slim/fastmcp/utilities/tests.py b/fastmcp_slim/fastmcp/utilities/tests.py index 0a9cb980c..0ca29c146 100644 --- a/fastmcp_slim/fastmcp/utilities/tests.py +++ b/fastmcp_slim/fastmcp/utilities/tests.py @@ -11,6 +11,7 @@ from urllib.parse import parse_qs, urlparse import httpx import uvicorn +from mcp.shared.auth import AuthorizationCodeResult from fastmcp import settings from fastmcp.client.auth.oauth import OAuth @@ -241,8 +242,8 @@ class HeadlessOAuth(OAuth): response = await client.get(authorization_url, follow_redirects=False) self._stored_response = response - async def callback_handler(self) -> tuple[str, str | None]: - """Parse stored response and return (auth_code, state).""" + async def callback_handler(self) -> AuthorizationCodeResult: + """Parse stored response and return the authorization code result.""" if not self._stored_response: raise RuntimeError( "No authorization response stored. redirect_handler must be called first." @@ -269,6 +270,6 @@ class HeadlessOAuth(OAuth): auth_code = query_params["code"][0] state = query_params.get("state", [None])[0] - return auth_code, state + return AuthorizationCodeResult(code=auth_code, state=state) else: raise RuntimeError(f"Authorization failed: {response.status_code}") diff --git a/fastmcp_slim/fastmcp/utilities/types.py b/fastmcp_slim/fastmcp/utilities/types.py index 70e778290..fe43c9081 100644 --- a/fastmcp_slim/fastmcp/utilities/types.py +++ b/fastmcp_slim/fastmcp/utilities/types.py @@ -19,13 +19,18 @@ from typing import ( get_type_hints, ) -import mcp.types -from mcp.types import Annotations, ContentBlock, ModelPreferences, SamplingMessage +import mcp_types +from mcp_types import Annotations, ContentBlock, ModelPreferences, SamplingMessage from pydantic import AnyUrl, BaseModel, ConfigDict, Field, TypeAdapter, UrlConstraints from typing_extensions import TypeVar T = TypeVar("T", default=Any) +# TODO(sdkv2): the SDK's `mcp.types.AnyFunction` alias was removed with the +# mcp.types module. FastMCP owns it now; keep the same `Callable[..., Any]` +# meaning used by tool/prompt/resource decorators. +AnyFunction: TypeAlias = Callable[..., Any] + # sentinel values for optional arguments NotSet = ... NotSetT: TypeAlias = EllipsisType @@ -290,14 +295,14 @@ class Image: self, mime_type: str | None = None, annotations: Annotations | None = None, - ) -> mcp.types.ImageContent: + ) -> mcp_types.ImageContent: """Convert to MCP ImageContent.""" data = self._get_data() - return mcp.types.ImageContent( + return mcp_types.ImageContent( type="image", data=data, - mimeType=mime_type or self._mime_type, + mime_type=mime_type or self._mime_type, annotations=annotations or self.annotations, ) @@ -348,7 +353,7 @@ class Audio: self, mime_type: str | None = None, annotations: Annotations | None = None, - ) -> mcp.types.AudioContent: + ) -> mcp_types.AudioContent: if self.path: with open(self.path, "rb") as f: data = base64.b64encode(f.read()).decode() @@ -357,10 +362,10 @@ class Audio: else: raise ValueError("No audio data available") - return mcp.types.AudioContent( + return mcp_types.AudioContent( type="audio", data=data, - mimeType=mime_type or self._mime_type, + mime_type=mime_type or self._mime_type, annotations=annotations or self.annotations, ) @@ -408,7 +413,7 @@ class File: self, mime_type: str | None = None, annotations: Annotations | None = None, - ) -> mcp.types.EmbeddedResource: + ) -> mcp_types.EmbeddedResource: if self.path: with open(self.path, "rb") as f: raw_data = f.read() @@ -423,28 +428,30 @@ class File: raise ValueError("No resource data available") mime = mime_type or self._mime_type + # Validate the URI shape, then pass the string form to the SDK types + # (their `uri` fields are plain `str` in the v2 SDK). UriType = Annotated[AnyUrl, UrlConstraints(host_required=False)] - uri = TypeAdapter(UriType).validate_python(uri_str) + uri = str(TypeAdapter(UriType).validate_python(uri_str)) if mime.startswith("text/"): try: text = raw_data.decode("utf-8") except UnicodeDecodeError: text = raw_data.decode("latin-1") - resource = mcp.types.TextResourceContents( + resource = mcp_types.TextResourceContents( text=text, - mimeType=mime, + mime_type=mime, uri=uri, ) else: data = base64.b64encode(raw_data).decode() - resource = mcp.types.BlobResourceContents( + resource = mcp_types.BlobResourceContents( blob=data, - mimeType=mime, + mime_type=mime, uri=uri, ) - return mcp.types.EmbeddedResource( + return mcp_types.EmbeddedResource( type="resource", resource=resource, annotations=annotations or self.annotations, diff --git a/fastmcp_slim/pyproject.toml b/fastmcp_slim/pyproject.toml index ed17acc26..7555ae5f1 100644 --- a/fastmcp_slim/pyproject.toml +++ b/fastmcp_slim/pyproject.toml @@ -4,8 +4,9 @@ dynamic = ["version", "optional-dependencies"] description = "The dependency-slim FastMCP package." authors = [{ name = "Jeremiah Lowin" }] dependencies = [ + "mcp-types==2.0.0b1", "platformdirs>=4.0.0", - "pydantic[email]>=2.11.7", + "pydantic[email]>=2.12.0", "pydantic-settings>=2.0.0", "python-dotenv>=1.1.0", "rich>=13.9.4", @@ -78,8 +79,8 @@ gemini = ["google-genai>=1.18.0", "jsonref>=1.1.0"] mcp = [ "exceptiongroup>=1.2.2", "httpx>=0.28.1,<1.0", - "mcp>=1.24.0,<2.0", - "opentelemetry-api>=1.20.0", + "mcp==2.0.0b1", + "opentelemetry-api>=1.28.0", # starlette floor: transitive via mcp (which only requires >=0.27). # Pin past CVE-2026-48710, which was patched in 1.0.1. "starlette>=1.0.1", diff --git a/pyproject.toml b/pyproject.toml index 090e8488b..55079ec66 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -72,7 +72,7 @@ members = ["fastmcp_slim", "fastmcp_remote"] [tool.uv] default-groups = ["dev"] exclude-newer = "1 week" -exclude-newer-package = { prefab-ui = false } +exclude-newer-package = { prefab-ui = false, mcp = false, mcp-types = false } [dependency-groups] dev = [ diff --git a/tests/cli/test_client_commands.py b/tests/cli/test_client_commands.py index a0d0745d7..d2083d1db 100644 --- a/tests/cli/test_client_commands.py +++ b/tests/cli/test_client_commands.py @@ -5,7 +5,7 @@ from pathlib import Path from typing import Any from unittest.mock import patch -import mcp.types +import mcp_types import pytest from fastmcp import FastMCP @@ -161,17 +161,17 @@ class TestFormatToolSignature: required: list[str] | None = None, output_schema: dict[str, Any] | None = None, description: str | None = None, - ) -> mcp.types.Tool: + ) -> mcp_types.Tool: input_schema: dict[str, Any] = {"type": "object"} if properties is not None: input_schema["properties"] = properties if required is not None: input_schema["required"] = required - return mcp.types.Tool( + return mcp_types.Tool( name=name, description=description, - inputSchema=input_schema, - outputSchema=output_schema, + input_schema=input_schema, + output_schema=output_schema, ) def test_no_params(self): @@ -546,7 +546,7 @@ class TestFormatCallResult: """structured_content (raw dict) is used for display, not data (which may be a non-serializable dataclass).""" result = CallToolResult( - content=[mcp.types.TextContent(type="text", text="ok")], + content=[mcp_types.TextContent(type="text", text="ok")], structured_content={"key": "value"}, meta=None, data=object(), # non-serializable on purpose @@ -561,7 +561,7 @@ class TestFormatCallResult: self, capsys: pytest.CaptureFixture[str] ): result = CallToolResult( - content=[mcp.types.TextContent(type="text", text="[red]x[/red]\x1b[2J")], + content=[mcp_types.TextContent(type="text", text="[red]x[/red]\x1b[2J")], structured_content=None, meta=None, data=None, diff --git a/tests/cli/test_generate_cli.py b/tests/cli/test_generate_cli.py index 8f567c846..63cd23bab 100644 --- a/tests/cli/test_generate_cli.py +++ b/tests/cli/test_generate_cli.py @@ -5,7 +5,7 @@ from pathlib import Path from typing import Any from unittest.mock import patch -import mcp.types +import mcp_types import pytest from fastmcp import FastMCP @@ -148,9 +148,9 @@ class TestSerializeTransport: class TestToolFunctionSource: def test_required_param(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="greet", - inputSchema={ + input_schema={ "properties": {"name": {"type": "string", "description": "Who"}}, "required": ["name"], }, @@ -162,9 +162,9 @@ class TestToolFunctionSource: assert "_call_tool('greet', {'name': name})" in source def test_optional_param(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="search", - inputSchema={ + input_schema={ "properties": { "query": {"type": "string", "description": "Search query"}, "limit": {"type": "integer", "description": "Max results"}, @@ -178,9 +178,9 @@ class TestToolFunctionSource: assert "= None" in source def test_param_with_default(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="fetch", - inputSchema={ + input_schema={ "properties": { "url": {"type": "string", "description": "URL"}, "timeout": { @@ -197,18 +197,18 @@ class TestToolFunctionSource: assert "= 30" in source def test_no_params(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="ping", - inputSchema={"properties": {}}, + input_schema={"properties": {}}, ) source = _tool_function_source(tool) assert "async def ping(" in source assert "_call_tool('ping', {})" in source def test_preserves_underscores(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="get_forecast", - inputSchema={ + input_schema={ "properties": {"city": {"type": "string"}}, "required": ["city"], }, @@ -217,18 +217,18 @@ class TestToolFunctionSource: assert "async def get_forecast(" in source def test_sanitizes_tool_name(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="my.tool/v2", - inputSchema={"properties": {}}, + input_schema={"properties": {}}, ) source = _tool_function_source(tool) assert "async def my_tool_v2(" in source assert "name='my.tool/v2'" in source def test_sanitizes_param_name(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="fetch", - inputSchema={ + input_schema={ "properties": {"content-type": {"type": "string", "description": "CT"}}, "required": ["content-type"], }, @@ -238,10 +238,10 @@ class TestToolFunctionSource: assert "'content-type': content_type" in source def test_description_in_docstring(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="greet", description="Say hello to someone.", - inputSchema={ + input_schema={ "properties": {"name": {"type": "string"}}, "required": ["name"], }, @@ -250,10 +250,10 @@ class TestToolFunctionSource: assert "'''Say hello to someone.'''" in source def test_description_with_quotes(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="fetch", description="Fetch data from 'source' API.", - inputSchema={ + input_schema={ "properties": {"url": {"type": "string"}}, "required": ["url"], }, @@ -265,10 +265,10 @@ class TestToolFunctionSource: compile(source, "<test>", "exec") def test_array_of_strings_parameter(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="tag_items", description="Tag multiple items.", - inputSchema={ + input_schema={ "properties": { "item_id": {"type": "string"}, "tags": {"type": "array", "items": {"type": "string"}}, @@ -285,10 +285,10 @@ class TestToolFunctionSource: compile(source, "<test>", "exec") def test_complex_object_parameter(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="create_user", description="Create a user.", - inputSchema={ + input_schema={ "properties": { "name": {"type": "string"}, "metadata": { @@ -318,10 +318,10 @@ class TestToolFunctionSource: compile(source, "<test>", "exec") def test_nested_array_parameter(self): - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="batch_process", description="Process batches.", - inputSchema={ + input_schema={ "properties": { "batches": { "type": "array", @@ -346,9 +346,9 @@ class TestToolFunctionSource: def test_complex_type_with_default(self): """Test that complex types with defaults are JSON-serialized.""" - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="configure", - inputSchema={ + input_schema={ "properties": { "options": { "type": "object", @@ -367,9 +367,9 @@ class TestToolFunctionSource: def test_name_collision_detection(self): """Test that parameter name collisions are detected.""" - tool = mcp.types.Tool( + tool = mcp_types.Tool( name="test", - inputSchema={ + input_schema={ "properties": { "content-type": {"type": "string"}, "content_type": {"type": "string"}, @@ -409,22 +409,22 @@ class TestDeriveServerName: class TestGenerateCliScript: - def _make_tools(self) -> list[mcp.types.Tool]: + def _make_tools(self) -> list[mcp_types.Tool]: return [ - mcp.types.Tool( + mcp_types.Tool( name="greet", description="Say hello", - inputSchema={ + input_schema={ "properties": { "name": {"type": "string", "description": "Who to greet"}, }, "required": ["name"], }, ), - mcp.types.Tool( + mcp_types.Tool( name="add_numbers", description="Add two numbers", - inputSchema={ + input_schema={ "properties": { "a": {"type": "integer", "description": "First number"}, "b": {"type": "integer", "description": "Second number"}, @@ -507,10 +507,10 @@ class TestGenerateCliScript: def test_compiles_with_unusual_names(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="my.tool/v2", description="A tool with dots and slashes", - inputSchema={ + input_schema={ "properties": { "content-type": {"type": "string", "description": "CT"}, }, @@ -771,10 +771,10 @@ class TestGenerateSkillContent: def test_tool_sections(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="greet", description="Say hello", - inputSchema={ + input_schema={ "type": "object", "properties": { "name": {"type": "string", "description": "Who to greet"} @@ -794,9 +794,9 @@ class TestGenerateSkillContent: def test_frontmatter_with_tools_starts_at_column_zero(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="greet", - inputSchema={"type": "object", "properties": {}}, + input_schema={"type": "object", "properties": {}}, ), ] content = generate_skill_content("weather", "cli.py", tools) @@ -804,10 +804,10 @@ class TestGenerateSkillContent: def test_optional_param(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="search", description="Search things", - inputSchema={ + input_schema={ "type": "object", "properties": { "query": {"type": "string"}, @@ -824,10 +824,10 @@ class TestGenerateSkillContent: def test_complex_json_param(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="create", description="Create item", - inputSchema={ + input_schema={ "type": "object", "properties": { "data": { @@ -844,10 +844,10 @@ class TestGenerateSkillContent: def test_no_params_tool(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="ping", description="Ping the server", - inputSchema={"type": "object", "properties": {}}, + input_schema={"type": "object", "properties": {}}, ), ] content = generate_skill_content("test", "cli.py", tools) @@ -863,10 +863,10 @@ class TestGenerateSkillContent: def test_pipe_in_description_escaped(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="test", description="Test", - inputSchema={ + input_schema={ "type": "object", "properties": { "mode": {"type": "string", "description": "a|b|c"}, @@ -879,10 +879,10 @@ class TestGenerateSkillContent: def test_union_type_pipes_escaped(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="test", description="Test", - inputSchema={ + input_schema={ "type": "object", "properties": { "val": {"type": ["string", "null"]}, @@ -896,10 +896,10 @@ class TestGenerateSkillContent: def test_boolean_param_no_value_placeholder(self): tools = [ - mcp.types.Tool( + mcp_types.Tool( name="run", description="Run something", - inputSchema={ + input_schema={ "type": "object", "properties": { "verbose": {"type": "boolean", "description": "Verbose output"}, diff --git a/tests/cli/test_run.py b/tests/cli/test_run.py index bc8487a0e..c89c87b17 100644 --- a/tests/cli/test_run.py +++ b/tests/cli/test_run.py @@ -296,14 +296,14 @@ class TestV1ServerAsync: """Test that v1 server uses async stdio method.""" from unittest.mock import AsyncMock, patch - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.cli.run import run_command # Create a v1 FastMCP server file with both sync and async tools test_file = tmp_path / "v1_server.py" test_file.write_text(""" -from mcp.server.fastmcp import FastMCP +from mcp.server.mcpserver import MCPServer as FastMCP mcp = FastMCP("V1Server") @@ -320,7 +320,7 @@ async def async_echo(text: str) -> str: # Mock the async run method with patch.object( - FastMCP1x, "run_stdio_async", new_callable=AsyncMock + SDKServer, "run_stdio_async", new_callable=AsyncMock ) as run_mock: await run_command(str(test_file), transport="stdio") run_mock.assert_called_once() @@ -329,14 +329,14 @@ async def async_echo(text: str) -> str: """Test that v1 server uses async http method.""" from unittest.mock import AsyncMock, patch - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.cli.run import run_command # Create a v1 FastMCP server file with both sync and async tools test_file = tmp_path / "v1_server.py" test_file.write_text(""" -from mcp.server.fastmcp import FastMCP +from mcp.server.mcpserver import MCPServer as FastMCP mcp = FastMCP("V1Server") @@ -353,7 +353,7 @@ async def async_echo(text: str) -> str: # Mock the async run method with patch.object( - FastMCP1x, "run_streamable_http_async", new_callable=AsyncMock + SDKServer, "run_streamable_http_async", new_callable=AsyncMock ) as run_mock: await run_command(str(test_file), transport="http") run_mock.assert_called_once() @@ -362,14 +362,14 @@ async def async_echo(text: str) -> str: """Test that v1 server uses async streamable-http method.""" from unittest.mock import AsyncMock, patch - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.cli.run import run_command # Create a v1 FastMCP server file with both sync and async tools test_file = tmp_path / "v1_server.py" test_file.write_text(""" -from mcp.server.fastmcp import FastMCP +from mcp.server.mcpserver import MCPServer as FastMCP mcp = FastMCP("V1Server") @@ -386,7 +386,7 @@ async def async_echo(text: str) -> str: # Mock the async run method with patch.object( - FastMCP1x, "run_streamable_http_async", new_callable=AsyncMock + SDKServer, "run_streamable_http_async", new_callable=AsyncMock ) as run_mock: await run_command(str(test_file), transport="streamable-http") run_mock.assert_called_once() @@ -395,14 +395,14 @@ async def async_echo(text: str) -> str: """Test that v1 server uses async sse method.""" from unittest.mock import AsyncMock, patch - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.cli.run import run_command # Create a v1 FastMCP server file with both sync and async tools test_file = tmp_path / "v1_server.py" test_file.write_text(""" -from mcp.server.fastmcp import FastMCP +from mcp.server.mcpserver import MCPServer as FastMCP mcp = FastMCP("V1Server") @@ -419,7 +419,7 @@ async def async_echo(text: str) -> str: # Mock the async run method with patch.object( - FastMCP1x, "run_sse_async", new_callable=AsyncMock + SDKServer, "run_sse_async", new_callable=AsyncMock ) as run_mock: await run_command(str(test_file), transport="sse") run_mock.assert_called_once() @@ -428,14 +428,14 @@ async def async_echo(text: str) -> str: """Test that v1 server uses streamable-http by default.""" from unittest.mock import AsyncMock, patch - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.cli.run import run_command # Create a v1 FastMCP server file with both sync and async tools test_file = tmp_path / "v1_server.py" test_file.write_text(""" -from mcp.server.fastmcp import FastMCP +from mcp.server.mcpserver import MCPServer as FastMCP mcp = FastMCP("V1Server") @@ -452,7 +452,7 @@ async def async_echo(text: str) -> str: # Mock the async run method with patch.object( - FastMCP1x, "run_streamable_http_async", new_callable=AsyncMock + SDKServer, "run_streamable_http_async", new_callable=AsyncMock ) as run_mock: await run_command(str(test_file)) run_mock.assert_called_once() @@ -461,14 +461,14 @@ async def async_echo(text: str) -> str: """Test that v1 server receives host/port settings.""" from unittest.mock import AsyncMock, patch - from mcp.server.fastmcp import FastMCP as FastMCP1x + from mcp.server.mcpserver import MCPServer as SDKServer from fastmcp.cli.run import run_command # Create a v1 FastMCP server file with both sync and async tools test_file = tmp_path / "v1_server.py" test_file.write_text(""" -from mcp.server.fastmcp import FastMCP +from mcp.server.mcpserver import MCPServer as FastMCP mcp = FastMCP("V1Server") @@ -485,7 +485,7 @@ async def async_echo(text: str) -> str: # Mock the async run method with patch.object( - FastMCP1x, "run_streamable_http_async", new_callable=AsyncMock + SDKServer, "run_streamable_http_async", new_callable=AsyncMock ) as run_mock: await run_command( str(test_file), transport="http", host="0.0.0.0", port=9000 diff --git a/tests/client/auth/test_oauth_client.py b/tests/client/auth/test_oauth_client.py index e446651ea..e069270e0 100644 --- a/tests/client/auth/test_oauth_client.py +++ b/tests/client/auth/test_oauth_client.py @@ -5,7 +5,8 @@ from urllib.parse import urlparse import httpx import pytest -from mcp.types import TextResourceContents +from mcp import MCPError +from mcp_types import TextResourceContents import fastmcp.client.auth.oauth as oauth_module import fastmcp.utilities.http as http_module @@ -68,8 +69,12 @@ def client_with_headless_oauth(streamable_http_server: str) -> Client: async def test_unauthorized(client_unauthorized: Client): - """Test that unauthenticated requests are rejected.""" - with pytest.raises(httpx.HTTPStatusError, match="401 Unauthorized"): + """Test that unauthenticated requests are rejected. + + SDK v2 surfaces the server's 401 as an MCPError ("Server returned an error + response") rather than re-raising the raw httpx.HTTPStatusError. + """ + with pytest.raises(MCPError, match="error response"): async with client_unauthorized: pass diff --git a/tests/client/client/test_client.py b/tests/client/client/test_client.py index 765e6e726..86355ce9e 100644 --- a/tests/client/client/test_client.py +++ b/tests/client/client/test_client.py @@ -7,8 +7,8 @@ from typing import Any, cast import anyio import pytest -from mcp import ClientSession, McpError -from mcp.types import TextContent +from mcp import ClientSession, MCPError +from mcp_types import TextContent from pydantic import AnyUrl import fastmcp @@ -70,7 +70,7 @@ async def test_call_tool_mcp(fastmcp_server): # Check that we got the raw MCP CallToolResult object assert hasattr(result, "content") assert hasattr(result, "isError") - assert result.isError is False + assert result.is_error is False # The content is a list, so we'll check the first element # by properly accessing it content = result.content @@ -94,12 +94,13 @@ async def test_call_tool_with_meta(): assert context.request_context is not None meta = context.request_context.meta - # Return the metadata as a dict + # Return the metadata as a dict. Under SDK v2 the lifted request meta + # is a plain dict, so custom fields are read by key. if meta is not None: return { "has_meta": True, - "user_id": getattr(meta, "user_id", None), - "trace_id": getattr(meta, "trace_id", None), + "user_id": meta.get("user_id"), + "trace_id": meta.get("trace_id"), } return {"has_meta": False} @@ -284,7 +285,7 @@ async def test_server_deserialization_error(): client = Client(transport=FastMCPTransport(server)) async with client: - with pytest.raises(McpError, match="Could not convert argument"): + with pytest.raises(MCPError, match="Could not convert argument"): await client.get_prompt( "strict_typed_prompt", { @@ -356,7 +357,7 @@ async def test_initialize_called_once(fastmcp_server): async with client: # Verify that initialization succeeded by checking initialize_result assert client.initialize_result is not None - assert client.initialize_result.serverInfo is not None + assert client.initialize_result.server_info is not None async def test_initialize_result_connected(fastmcp_server): @@ -372,8 +373,8 @@ async def test_initialize_result_connected(fastmcp_server): # Verify the initialize result has expected properties assert hasattr(result, "serverInfo") - assert result.serverInfo.name == "TestServer" - assert result.serverInfo.version is not None + assert result.server_info.name == "TestServer" + assert result.server_info.version is not None async def test_initialize_result_disconnected(fastmcp_server): @@ -401,8 +402,8 @@ async def test_server_info_custom_version(): async with client: result = client.initialize_result assert result is not None - assert result.serverInfo.name == "CustomVersionServer" - assert result.serverInfo.version == "1.2.3" + assert result.server_info.name == "CustomVersionServer" + assert result.server_info.version == "1.2.3" # Test without version (backward compatibility) server_without_version = FastMCP("DefaultVersionServer") @@ -411,9 +412,9 @@ async def test_server_info_custom_version(): async with client: result = client.initialize_result assert result is not None - assert result.serverInfo.name == "DefaultVersionServer" + assert result.server_info.name == "DefaultVersionServer" # Should fall back to FastMCP version - assert result.serverInfo.version == fastmcp.__version__ + assert result.server_info.version == fastmcp.__version__ class _DelayedConnectTransport(ClientTransport): @@ -717,7 +718,7 @@ async def test_resource_template(fastmcp_server): # Check that our template is available assert len(result) == 1 - assert "data://user/{user_id}" in result[0].uriTemplate + assert "data://user/{user_id}" in result[0].uri_template # Now use the template with a specific user_id uri = cast(AnyUrl, "data://user/123") @@ -739,8 +740,8 @@ async def test_list_resource_templates_mcp(fastmcp_server): # Check that we got the raw MCP ListResourceTemplatesResult object assert hasattr(result, "resourceTemplates") - assert len(result.resourceTemplates) == 1 - assert "data://user/{user_id}" in result.resourceTemplates[0].uriTemplate + assert len(result.resource_templates) == 1 + assert "data://user/{user_id}" in result.resource_templates[0].uri_template async def test_mcp_resource_generation(fastmcp_server): @@ -772,7 +773,7 @@ async def test_mcp_template_generation(fastmcp_server): assert hasattr(template, "uriTemplate") assert hasattr(template, "name") assert hasattr(template, "description") - assert "data://user/{user_id}" in template.uriTemplate + assert "data://user/{user_id}" in template.uri_template async def test_template_access_via_client(fastmcp_server): @@ -811,7 +812,7 @@ async def test_tagged_template_metadata(tagged_resources_server): template = templates[0] # Verify template metadata is preserved - assert "template://{id}" in template.uriTemplate + assert "template://{id}" in template.uri_template assert template.description == "A tagged template" diff --git a/tests/client/client/test_error_handling.py b/tests/client/client/test_error_handling.py index cb4f37d9c..aa1ed61d1 100644 --- a/tests/client/client/test_error_handling.py +++ b/tests/client/client/test_error_handling.py @@ -2,9 +2,9 @@ import logging -import mcp.types +import mcp_types import pytest -from mcp.types import TextContent, ToolUseContent +from mcp_types import TextContent, ToolUseContent from pydantic import AnyUrl from fastmcp.client import Client @@ -27,7 +27,7 @@ class TestErrorHandling: async with client: result = await client.call_tool_mcp("error_tool", {}) - assert result.isError + assert result.is_error assert isinstance(result.content[0], TextContent) assert "test error" in result.content[0].text assert "abc" in result.content[0].text @@ -43,7 +43,7 @@ class TestErrorHandling: async with client: result = await client.call_tool_mcp("error_tool", {}) - assert result.isError + assert result.is_error assert isinstance(result.content[0], TextContent) assert "test error" not in result.content[0].text assert "abc" not in result.content[0].text @@ -57,7 +57,7 @@ class TestErrorHandling: async with Client(transport=FastMCPTransport(mcp)) as client: result = await client.call_tool_mcp("validated_tool", {"x": "abc"}) - assert result.isError + assert result.is_error # Pydantic validation error message should NOT be masked assert isinstance(result.content[0], TextContent) assert "Input should be a valid integer" in result.content[0].text @@ -73,7 +73,7 @@ class TestErrorHandling: async with client: result = await client.call_tool_mcp("custom_error_tool", {}) - assert result.isError + assert result.is_error assert isinstance(result.content[0], TextContent) assert "test error" in result.content[0].text assert "abc" in result.content[0].text @@ -207,7 +207,7 @@ class TestParseToolResultEdgeCases: """ async def test_error_with_empty_content_raises_with_fallback_message(self): - result = mcp.types.CallToolResult(content=[], isError=True) + result = mcp_types.CallToolResult(content=[], is_error=True) with pytest.raises(ToolError, match="Tool 'my_tool' returned an error"): await _parse_call_tool_result( @@ -219,11 +219,11 @@ class TestParseToolResultEdgeCases: ) async def test_error_with_non_text_content_raises_with_fallback_message(self): - result = mcp.types.CallToolResult( + result = mcp_types.CallToolResult( content=[ - mcp.types.ImageContent(type="image", data="abc", mimeType="image/png") + mcp_types.ImageContent(type="image", data="abc", mime_type="image/png") ], - isError=True, + is_error=True, ) with pytest.raises(ToolError, match="Tool 'my_tool' returned an error"): @@ -236,9 +236,9 @@ class TestParseToolResultEdgeCases: ) async def test_error_with_text_content_raises_with_message(self): - result = mcp.types.CallToolResult( - content=[mcp.types.TextContent(type="text", text="custom error msg")], - isError=True, + result = mcp_types.CallToolResult( + content=[mcp_types.TextContent(type="text", text="custom error msg")], + is_error=True, ) with pytest.raises(ToolError, match="custom error msg"): @@ -251,10 +251,10 @@ class TestParseToolResultEdgeCases: ) async def test_error_with_structured_content_does_not_parse_data(self): - result = mcp.types.CallToolResult( - content=[mcp.types.TextContent(type="text", text="error happened")], - isError=True, - structuredContent={"key": "value"}, + result = mcp_types.CallToolResult( + content=[mcp_types.TextContent(type="text", text="error happened")], + is_error=True, + structured_content={"key": "value"}, ) parsed = await _parse_call_tool_result( @@ -283,7 +283,7 @@ class TestLogLevel: with caplog.at_level(logging.WARNING): result = await client.call_tool_mcp("custom_level_tool", {}) - assert result.isError + assert result.is_error assert isinstance(result.content[0], TextContent) assert "Missing required parameter" in result.content[0].text assert any( @@ -307,7 +307,7 @@ class TestLogLevel: with caplog.at_level(logging.ERROR): result = await client.call_tool_mcp("regular_error_tool", {}) - assert result.isError + assert result.is_error assert isinstance(result.content[0], TextContent) assert "Something went wrong" in result.content[0].text assert any( @@ -428,7 +428,7 @@ class TestLogLevel: ) assert len(results) == 1 - assert results[0].isError + assert results[0].is_error assert "Expected sampling error" in results[0].content[0].text # type: ignore assert any( "Error calling sampling tool" in record.message diff --git a/tests/client/client/test_initialize.py b/tests/client/client/test_initialize.py index 2c0ccfdf4..7bbe3aeb8 100644 --- a/tests/client/client/test_initialize.py +++ b/tests/client/client/test_initialize.py @@ -14,7 +14,7 @@ class TestInitialize: async with client: # Should be automatically initialized assert client.initialize_result is not None - assert client.initialize_result.serverInfo.name == "TestServer" + assert client.initialize_result.server_info.name == "TestServer" assert client.initialize_result.instructions is None async def test_auto_initialize_explicit_true(self, fastmcp_server): @@ -23,7 +23,7 @@ class TestInitialize: async with client: assert client.initialize_result is not None - assert client.initialize_result.serverInfo.name == "TestServer" + assert client.initialize_result.server_info.name == "TestServer" async def test_auto_initialize_false(self, fastmcp_server): """Test that auto_initialize=False prevents automatic initialization.""" @@ -42,7 +42,7 @@ class TestInitialize: result = await client.initialize() assert result is not None - assert result.serverInfo.name == "TestServer" + assert result.server_info.name == "TestServer" assert client.initialize_result is result async def test_initialize_idempotent(self, fastmcp_server): @@ -90,7 +90,7 @@ class TestInitialize: # Access via property result = client.initialize_result assert result is not None - assert result.serverInfo.name == "TestServer" + assert result.server_info.name == "TestServer" # Call method - should return cached result2 = await client.initialize() diff --git a/tests/client/client/test_timeout.py b/tests/client/client/test_timeout.py index 5106e7cb6..d770aa04f 100644 --- a/tests/client/client/test_timeout.py +++ b/tests/client/client/test_timeout.py @@ -1,7 +1,7 @@ """Client timeout tests.""" import pytest -from mcp import McpError +from mcp import MCPError from fastmcp.client import Client from fastmcp.client.transports import FastMCPTransport @@ -14,14 +14,14 @@ class TestTimeout: transport=FastMCPTransport(fastmcp_server), timeout=0.05 ) as client: with pytest.raises( - McpError, - match="Timed out while waiting for response to ClientRequest. Waited 0.05 seconds", + MCPError, + match="timed out", ): await client.call_tool("sleep", {"seconds": 0.1}) async def test_timeout_tool_call(self, fastmcp_server: FastMCP): async with Client(transport=FastMCPTransport(fastmcp_server)) as client: - with pytest.raises(McpError): + with pytest.raises(MCPError): await client.call_tool("sleep", {"seconds": 0.1}, timeout=0.01) async def test_timeout_tool_call_overrides_client_timeout( @@ -31,7 +31,7 @@ class TestTimeout: transport=FastMCPTransport(fastmcp_server), timeout=2, ) as client: - with pytest.raises(McpError): + with pytest.raises(MCPError): await client.call_tool("sleep", {"seconds": 0.1}, timeout=0.01) async def test_timeout_tool_call_overrides_client_timeout_even_if_lower( diff --git a/tests/client/client/test_transport.py b/tests/client/client/test_transport.py index b7ee5330c..d0d80f79d 100644 --- a/tests/client/client/test_transport.py +++ b/tests/client/client/test_transport.py @@ -130,7 +130,7 @@ class TestInferTransport: def test_infer_fastmcp_v1_server(self): """FastMCP 1.0 server instances should infer to FastMCPTransport.""" - from mcp.server.fastmcp import FastMCP as FastMCP1 + from mcp.server.mcpserver import MCPServer as FastMCP1 server = FastMCP1() transport = infer_transport(server) diff --git a/tests/client/sampling/handlers/test_anthropic_handler.py b/tests/client/sampling/handlers/test_anthropic_handler.py index 757ec2eeb..229a1c02e 100644 --- a/tests/client/sampling/handlers/test_anthropic_handler.py +++ b/tests/client/sampling/handlers/test_anthropic_handler.py @@ -4,7 +4,7 @@ from unittest.mock import MagicMock import pytest from anthropic import AsyncAnthropic from anthropic.types import Message, TextBlock, ToolUseBlock, Usage -from mcp.types import ( +from mcp_types import ( AudioContent, CreateMessageResult, CreateMessageResultWithTools, @@ -18,7 +18,6 @@ from mcp.types import ( ToolResultContent, ToolUseContent, ) -from pydantic import AnyUrl from fastmcp.client.sampling.handlers.anthropic import ( AnthropicSamplingHandler, @@ -46,7 +45,7 @@ def test_convert_sampling_messages_to_anthropic_messages(): def test_image_content_to_anthropic_block(): block = _image_content_to_anthropic_block( - ImageContent(type="image", data="YWJj", mimeType="image/png") + ImageContent(type="image", data="YWJj", mime_type="image/png") ) assert block == { @@ -62,7 +61,7 @@ def test_image_content_to_anthropic_block(): def test_image_content_unsupported_mime_type_raises(): with pytest.raises(ValueError, match="Unsupported image MIME type"): _image_content_to_anthropic_block( - ImageContent(type="image", data="YWJj", mimeType="image/bmp") + ImageContent(type="image", data="YWJj", mime_type="image/bmp") ) @@ -71,7 +70,7 @@ def test_convert_single_image_content_to_anthropic_message(): messages=[ SamplingMessage( role="user", - content=ImageContent(type="image", data="YWJj", mimeType="image/png"), + content=ImageContent(type="image", data="YWJj", mime_type="image/png"), ) ], ) @@ -99,7 +98,7 @@ def test_convert_single_audio_content_raises(): SamplingMessage( role="user", content=AudioContent( - type="audio", data="YWJj", mimeType="audio/wav" + type="audio", data="YWJj", mime_type="audio/wav" ), ) ], @@ -113,7 +112,7 @@ def test_convert_list_content_with_image_and_text(): role="user", content=[ TextContent(type="text", text="Describe this image"), - ImageContent(type="image", data="YWJj", mimeType="image/jpeg"), + ImageContent(type="image", data="YWJj", mime_type="image/jpeg"), ], ) ], @@ -144,7 +143,7 @@ def test_convert_list_content_with_audio_raises(): role="user", content=[ TextContent(type="text", text="Listen to this"), - AudioContent(type="audio", data="YWJj", mimeType="audio/wav"), + AudioContent(type="audio", data="YWJj", mime_type="audio/wav"), ], ) ], @@ -158,7 +157,7 @@ def test_convert_image_in_assistant_message_raises(): SamplingMessage( role="assistant", content=ImageContent( - type="image", data="YWJj", mimeType="image/png" + type="image", data="YWJj", mime_type="image/png" ), ) ], @@ -173,7 +172,7 @@ def test_convert_list_image_in_assistant_message_raises(): role="assistant", content=[ TextContent(type="text", text="Here's the image"), - ImageContent(type="image", data="YWJj", mimeType="image/png"), + ImageContent(type="image", data="YWJj", mime_type="image/png"), ], ) ], @@ -252,7 +251,7 @@ def test_message_to_result_with_tools(): assert result.role == "assistant" assert result.model == "claude-3-5-sonnet-20241022" - assert result.stopReason == "toolUse" + assert result.stop_reason == "toolUse" content = result.content_as_list assert len(content) == 2 assert content[0] == TextContent(type="text", text="I'll help you with that.") @@ -296,13 +295,13 @@ def test_convert_tool_choice_unknown_raises(): def test_convert_tools_to_anthropic(): - from mcp.types import Tool + from mcp_types import Tool tools = [ Tool( name="get_weather", description="Get the current weather", - inputSchema={ + input_schema={ "type": "object", "properties": {"location": {"type": "string"}}, "required": ["location"], @@ -358,7 +357,7 @@ def test_convert_messages_with_tool_result_content(): role="user", content=ToolResultContent( type="tool_result", - toolUseId="toolu_123", + tool_use_id="toolu_123", content=[TextContent(type="text", text="72F and sunny")], ), ), @@ -387,7 +386,7 @@ def test_convert_messages_raises_on_unsupported_content_type(): embedded = EmbeddedResource( type="resource", resource=TextResourceContents( - uri=AnyUrl("file:///test.txt"), text="hello", mimeType="text/plain" + uri="file:///test.txt", text="hello", mime_type="text/plain" ), ) # Must be inside a list content — single-content messages hit a diff --git a/tests/client/sampling/handlers/test_google_genai_handler.py b/tests/client/sampling/handlers/test_google_genai_handler.py index d1b86d6c1..dd610c91a 100644 --- a/tests/client/sampling/handlers/test_google_genai_handler.py +++ b/tests/client/sampling/handlers/test_google_genai_handler.py @@ -14,7 +14,7 @@ try: Part, UserContent, ) - from mcp.types import ( + from mcp_types import ( AudioContent, CreateMessageResult, ImageContent, @@ -66,7 +66,7 @@ def test_convert_sampling_messages_to_google_genai_content(): def test_convert_single_image_content_to_google_genai(): part = _sampling_content_to_google_genai_part( - ImageContent(type="image", data="YWJj", mimeType="image/png") + ImageContent(type="image", data="YWJj", mime_type="image/png") ) assert part.inline_data is not None @@ -76,7 +76,7 @@ def test_convert_single_image_content_to_google_genai(): def test_convert_single_audio_content_to_google_genai(): part = _sampling_content_to_google_genai_part( - AudioContent(type="audio", data="YWJj", mimeType="audio/wav") + AudioContent(type="audio", data="YWJj", mime_type="audio/wav") ) assert part.inline_data is not None @@ -89,7 +89,7 @@ def test_convert_image_message_to_google_genai_content(): messages=[ SamplingMessage( role="user", - content=ImageContent(type="image", data="YWJj", mimeType="image/jpeg"), + content=ImageContent(type="image", data="YWJj", mime_type="image/jpeg"), ) ], ) @@ -105,7 +105,7 @@ def test_convert_audio_message_to_google_genai_content(): messages=[ SamplingMessage( role="user", - content=AudioContent(type="audio", data="YWJj", mimeType="audio/mp3"), + content=AudioContent(type="audio", data="YWJj", mime_type="audio/mp3"), ) ], ) @@ -123,7 +123,7 @@ def test_convert_list_content_with_image_and_text(): role="user", content=[ TextContent(type="text", text="What is in this image?"), - ImageContent(type="image", data="YWJj", mimeType="image/png"), + ImageContent(type="image", data="YWJj", mime_type="image/png"), ], ) ], @@ -144,7 +144,7 @@ def test_convert_list_content_with_audio_and_text(): role="user", content=[ TextContent(type="text", text="Transcribe this audio"), - AudioContent(type="audio", data="YWJj", mimeType="audio/wav"), + AudioContent(type="audio", data="YWJj", mime_type="audio/wav"), ], ) ], @@ -243,7 +243,7 @@ def test_sampling_content_to_google_genai_part_tool_result(): """Test converting ToolResultContent to Google GenAI Part with FunctionResponse.""" content = ToolResultContent( type="tool_result", - toolUseId="get_weather_abc123", + tool_use_id="get_weather_abc123", content=[TextContent(type="text", text="Weather is sunny")], ) @@ -259,7 +259,7 @@ def test_sampling_content_to_google_genai_part_tool_result_empty(): """Test converting empty ToolResultContent to Google GenAI Part.""" content = ToolResultContent( type="tool_result", - toolUseId="my_tool_xyz789", + tool_use_id="my_tool_xyz789", content=[], ) @@ -274,7 +274,7 @@ def test_sampling_content_to_google_genai_part_tool_result_no_underscore(): """Test ToolResultContent when toolUseId has no underscore (fallback).""" content = ToolResultContent( type="tool_result", - toolUseId="simplefunction", + tool_use_id="simplefunction", content=[TextContent(type="text", text="Result")], ) @@ -320,7 +320,7 @@ def test_convert_messages_with_tool_result(): role="user", content=ToolResultContent( type="tool_result", - toolUseId="get_weather_123", + tool_use_id="get_weather_123", content=[TextContent(type="text", text="Sunny, 72F")], ), ), @@ -343,7 +343,7 @@ def test_convert_messages_with_multiple_content_blocks(): TextContent(type="text", text="I need weather info."), ToolResultContent( type="tool_result", - toolUseId="get_weather_xyz", + tool_use_id="get_weather_xyz", content=[TextContent(type="text", text="Cloudy")], ), ], @@ -372,7 +372,7 @@ def test_response_to_result_with_tools_text_only(): assert result.role == "assistant" assert result.model == "gemini-2.0-flash" - assert result.stopReason == "endTurn" + assert result.stop_reason == "endTurn" assert isinstance(result.content, list) assert len(result.content) == 1 assert result.content[0].type == "text" @@ -394,7 +394,7 @@ def test_response_to_result_with_tools_function_call(): result = _response_to_result_with_tools(mock_response, model="gemini-2.0-flash") - assert result.stopReason == "toolUse" + assert result.stop_reason == "toolUse" assert isinstance(result.content, list) assert len(result.content) == 1 tool_use = result.content[0] @@ -421,7 +421,7 @@ def test_response_to_result_with_tools_mixed_content(): result = _response_to_result_with_tools(mock_response, model="gemini-2.0-flash") - assert result.stopReason == "toolUse" + assert result.stop_reason == "toolUse" assert isinstance(result.content, list) assert len(result.content) == 2 text_content = result.content[0] @@ -576,7 +576,7 @@ def test_normal_response_text_and_function_call(): assert isinstance(result.content[1], ToolUseContent) # ty: ignore[not-subscriptable] assert result.content[1].name == "lookup" # ty: ignore[not-subscriptable] assert result.content[1].input == {"q": "test"} # ty: ignore[not-subscriptable] - assert result.stopReason == "toolUse" + assert result.stop_reason == "toolUse" def test_thought_with_function_call_keeps_function_call(): @@ -598,4 +598,4 @@ def test_thought_with_function_call_keeps_function_call(): assert len(result.content) == 1 # ty: ignore[invalid-argument-type] assert isinstance(result.content[0], ToolUseContent) # ty: ignore[not-subscriptable] assert result.content[0].name == "get_weather" # ty: ignore[not-subscriptable] - assert result.stopReason == "toolUse" + assert result.stop_reason == "toolUse" diff --git a/tests/client/sampling/handlers/test_openai_handler.py b/tests/client/sampling/handlers/test_openai_handler.py index 4cfb9d606..7370b6885 100644 --- a/tests/client/sampling/handlers/test_openai_handler.py +++ b/tests/client/sampling/handlers/test_openai_handler.py @@ -2,7 +2,7 @@ from typing import Any from unittest.mock import AsyncMock, MagicMock import pytest -from mcp.types import ( +from mcp_types import ( AudioContent, CreateMessageRequestParams, CreateMessageResult, @@ -27,7 +27,6 @@ from openai.types.chat import ( ChatCompletionUserMessageParam, ) from openai.types.chat.chat_completion import Choice -from pydantic import AnyUrl from fastmcp.client.sampling.handlers.openai import ( OpenAISamplingHandler, @@ -58,7 +57,7 @@ def test_convert_sampling_messages_to_openai_messages(): def test_image_content_to_openai_part(): part = _image_content_to_openai_part( - ImageContent(type="image", data="YWJj", mimeType="image/png") + ImageContent(type="image", data="YWJj", mime_type="image/png") ) assert part == ChatCompletionContentPartImageParam( @@ -69,7 +68,7 @@ def test_image_content_to_openai_part(): def test_audio_content_to_openai_part_wav(): part = _audio_content_to_openai_part( - AudioContent(type="audio", data="YWJj", mimeType="audio/wav") + AudioContent(type="audio", data="YWJj", mime_type="audio/wav") ) assert part == ChatCompletionContentPartInputAudioParam( @@ -80,7 +79,7 @@ def test_audio_content_to_openai_part_wav(): def test_audio_content_to_openai_part_mp3(): part = _audio_content_to_openai_part( - AudioContent(type="audio", data="YWJj", mimeType="audio/mpeg") + AudioContent(type="audio", data="YWJj", mime_type="audio/mpeg") ) assert part["input_audio"]["format"] == "mp3" @@ -89,14 +88,14 @@ def test_audio_content_to_openai_part_mp3(): def test_audio_content_to_openai_part_unsupported_raises(): with pytest.raises(ValueError, match="Unsupported audio MIME type"): _audio_content_to_openai_part( - AudioContent(type="audio", data="YWJj", mimeType="audio/ogg") + AudioContent(type="audio", data="YWJj", mime_type="audio/ogg") ) def test_image_content_to_openai_part_unsupported_raises(): with pytest.raises(ValueError, match="Unsupported image MIME type"): _image_content_to_openai_part( - ImageContent(type="image", data="YWJj", mimeType="image/bmp") + ImageContent(type="image", data="YWJj", mime_type="image/bmp") ) @@ -106,7 +105,7 @@ def test_convert_single_image_content_to_openai_message(): messages=[ SamplingMessage( role="user", - content=ImageContent(type="image", data="YWJj", mimeType="image/png"), + content=ImageContent(type="image", data="YWJj", mime_type="image/png"), ) ], ) @@ -129,7 +128,7 @@ def test_convert_single_audio_content_to_openai_message(): messages=[ SamplingMessage( role="user", - content=AudioContent(type="audio", data="YWJj", mimeType="audio/wav"), + content=AudioContent(type="audio", data="YWJj", mime_type="audio/wav"), ) ], ) @@ -154,7 +153,7 @@ def test_convert_list_content_with_image_and_text(): role="user", content=[ TextContent(type="text", text="What is in this image?"), - ImageContent(type="image", data="YWJj", mimeType="image/jpeg"), + ImageContent(type="image", data="YWJj", mime_type="image/jpeg"), ], ) ], @@ -183,7 +182,7 @@ def test_convert_image_in_assistant_message_raises(): SamplingMessage( role="assistant", content=ImageContent( - type="image", data="YWJj", mimeType="image/png" + type="image", data="YWJj", mime_type="image/png" ), ) ], @@ -198,7 +197,7 @@ def test_convert_audio_in_assistant_message_raises(): SamplingMessage( role="assistant", content=AudioContent( - type="audio", data="YWJj", mimeType="audio/wav" + type="audio", data="YWJj", mime_type="audio/wav" ), ) ], @@ -215,7 +214,7 @@ def test_convert_list_image_in_assistant_message_raises(): role="assistant", content=[ TextContent(type="text", text="Here's the image"), - ImageContent(type="image", data="YWJj", mimeType="image/png"), + ImageContent(type="image", data="YWJj", mime_type="image/png"), ], ) ], @@ -237,7 +236,7 @@ def test_convert_list_tool_calls_with_image_raises(): name="my_tool", input={"arg": "val"}, ), - ImageContent(type="image", data="YWJj", mimeType="image/png"), + ImageContent(type="image", data="YWJj", mime_type="image/png"), ], ) ], @@ -284,7 +283,7 @@ async def test_handler_passes_max_completion_tokens(): messages = [ SamplingMessage(role="user", content=TextContent(type="text", text="hello")) ] - params = CreateMessageRequestParams(messages=messages, maxTokens=300) + params = CreateMessageRequestParams(messages=messages, max_tokens=300) await handler(messages, params, context=None) # type: ignore[arg-type] # ty:ignore[invalid-argument-type] call_kwargs = mock_client.chat.completions.create.call_args @@ -331,7 +330,7 @@ def test_convert_messages_raises_on_unsupported_content_type(): embedded = EmbeddedResource( type="resource", resource=TextResourceContents( - uri=AnyUrl("file:///test.txt"), text="hello", mimeType="text/plain" + uri="file:///test.txt", text="hello", mime_type="text/plain" ), ) msg = SamplingMessage.model_construct( diff --git a/tests/client/tasks/test_client_prompt_tasks.py b/tests/client/tasks/test_client_prompt_tasks.py index fd8445c40..57f55e0a3 100644 --- a/tests/client/tasks/test_client_prompt_tasks.py +++ b/tests/client/tasks/test_client_prompt_tasks.py @@ -54,6 +54,12 @@ async def test_prompt_task_server_generated_id(prompt_server): assert "-" in task.task_id +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_prompt_task_result_returns_get_prompt_result(prompt_server): """PromptTask.result() returns GetPromptResult.""" async with Client(prompt_server) as client: diff --git a/tests/client/tasks/test_client_resource_tasks.py b/tests/client/tasks/test_client_resource_tasks.py index be7c4ddd3..0dda0366f 100644 --- a/tests/client/tasks/test_client_resource_tasks.py +++ b/tests/client/tasks/test_client_resource_tasks.py @@ -50,6 +50,12 @@ async def test_resource_task_server_generated_id(resource_server): assert "-" in task.task_id +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on ReadResourceRequestParams, so " + "resource reads cannot be submitted as background tasks over the wire and " + "always graceful-degrade to immediate execution (sdk-feedback #3).", + strict=True, +) async def test_resource_task_result_returns_read_resource_result(resource_server): """ResourceTask.result() returns list of ReadResourceContents.""" async with Client(resource_server) as client: @@ -77,6 +83,12 @@ async def test_resource_task_await_syntax(resource_server): assert result[0].text == "Document content here" +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on ReadResourceRequestParams, so " + "resource reads cannot be submitted as background tasks over the wire and " + "always graceful-degrade to immediate execution (sdk-feedback #3).", + strict=True, +) async def test_resource_template_task(resource_server): """Resource templates work with task support.""" async with Client(resource_server) as client: diff --git a/tests/client/tasks/test_client_task_notifications.py b/tests/client/tasks/test_client_task_notifications.py index b02d149fc..94f7e1db3 100644 --- a/tests/client/tasks/test_client_task_notifications.py +++ b/tests/client/tasks/test_client_task_notifications.py @@ -10,7 +10,7 @@ import time from datetime import datetime, timezone import pytest -from mcp.types import GetTaskResult +from mcp_types import GetTaskResult from fastmcp import FastMCP from fastmcp.client import Client @@ -206,7 +206,7 @@ async def test_notification_with_failed_task(task_notification_server): status = await task.status() assert status.status == "failed" assert ( - status.statusMessage is not None + status.status_message is not None ) # Error details in statusMessage per spec @@ -215,14 +215,15 @@ async def test_wait_returns_on_input_required(task_notification_server): async with Client(task_notification_server) as client: task = await client.call_tool("quick_task", {"value": 1}, task=True) - # Directly inject an input_required status into the cache and signal the event - now = datetime.now(timezone.utc) + # Directly inject an input_required status into the cache and signal the event. + # SDK v2 types the Task timestamps as ISO 8601 strings. + now = datetime.now(timezone.utc).isoformat() input_required_status = GetTaskResult( - taskId=task._task_id, + task_id=task._task_id, status="input_required", - statusMessage="Waiting for user input", - createdAt=now, - lastUpdatedAt=now, + status_message="Waiting for user input", + created_at=now, + last_updated_at=now, ttl=None, ) task._status_cache = input_required_status diff --git a/tests/client/tasks/test_client_tool_tasks.py b/tests/client/tasks/test_client_tool_tasks.py index 8b98f69cd..0bec286cb 100644 --- a/tests/client/tasks/test_client_tool_tasks.py +++ b/tests/client/tasks/test_client_tool_tasks.py @@ -79,7 +79,7 @@ async def test_tool_task_status_and_wait(tool_task_server): task = await client.call_tool("echo", {"message": "test"}, task=True) status = await task.status() - assert status.taskId == task.task_id + assert status.task_id == task.task_id assert status.status in ["working", "completed"] # Wait for completion diff --git a/tests/client/tasks/test_task_context_validation.py b/tests/client/tasks/test_task_context_validation.py index ea236f286..fb4765e52 100644 --- a/tests/client/tasks/test_task_context_validation.py +++ b/tests/client/tasks/test_task_context_validation.py @@ -100,6 +100,12 @@ async def test_cached_tool_task_accessible_outside_context(task_server): assert result2.data == "Result: test" +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_cached_prompt_task_accessible_outside_context(task_server): """Prompt tasks with cached results work outside context.""" task = None @@ -120,6 +126,12 @@ async def test_cached_prompt_task_accessible_outside_context(task_server): assert result2.description == "Prompt that runs in background." +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_cached_resource_task_accessible_outside_context(task_server): """Resource tasks with cached results work outside context.""" task = None diff --git a/tests/client/tasks/test_task_result_caching.py b/tests/client/tasks/test_task_result_caching.py index ea7c8edaf..fdb48e129 100644 --- a/tests/client/tasks/test_task_result_caching.py +++ b/tests/client/tasks/test_task_result_caching.py @@ -5,6 +5,8 @@ Verifies that Task.result() and await task cache results properly to avoid redundant server calls and ensure consistent object identity. """ +import pytest + from fastmcp import FastMCP from fastmcp.client import Client @@ -159,10 +161,16 @@ async def test_forbidden_mode_tool_caches_error_result(): assert result1 is result2 is result3 +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_forbidden_mode_prompt_raises_error(): """Prompts with task=False (mode=forbidden) raise error.""" import pytest - from mcp.shared.exceptions import McpError + from mcp.shared.exceptions import MCPError mcp = FastMCP("test") @@ -171,15 +179,21 @@ async def test_forbidden_mode_prompt_raises_error(): return "Immediate" async with Client(mcp) as client: - # Prompts with mode="forbidden" raise McpError when called with task=True - with pytest.raises(McpError): + # Prompts with mode="forbidden" raise MCPError when called with task=True + with pytest.raises(MCPError): await client.get_prompt("non_task_prompt", task=True) +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_forbidden_mode_resource_raises_error(): """Resources with task=False (mode=forbidden) raise error.""" import pytest - from mcp.shared.exceptions import McpError + from mcp.shared.exceptions import MCPError mcp = FastMCP("test") @@ -188,8 +202,8 @@ async def test_forbidden_mode_resource_raises_error(): return "Immediate" async with Client(mcp) as client: - # Resources with mode="forbidden" raise McpError when called with task=True - with pytest.raises(McpError): + # Resources with mode="forbidden" raise MCPError when called with task=True + with pytest.raises(MCPError): await client.read_resource("file://immediate.txt", task=True) diff --git a/tests/client/telemetry/test_client_list_tracing.py b/tests/client/telemetry/test_client_list_tracing.py index 45038bbad..aaf08d030 100644 --- a/tests/client/telemetry/test_client_list_tracing.py +++ b/tests/client/telemetry/test_client_list_tracing.py @@ -32,6 +32,7 @@ class TestClientListToolsTracing: if s.name == "tools/list" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ] assert len(client_spans) >= 1 @@ -63,6 +64,7 @@ class TestClientListToolsTracing: for s in tools_list_spans if s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -105,6 +107,7 @@ class TestClientListResourcesTracing: if s.name == "resources/list" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ] assert len(client_spans) >= 1 @@ -138,6 +141,7 @@ class TestClientListResourceTemplatesTracing: if s.name == "resources/templates/list" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ] assert len(client_spans) >= 1 @@ -171,6 +175,7 @@ class TestClientListPromptsTracing: if s.name == "prompts/list" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ] assert len(client_spans) >= 1 diff --git a/tests/client/telemetry/test_client_tracing.py b/tests/client/telemetry/test_client_tracing.py index 54c4c08f3..1180a40dc 100644 --- a/tests/client/telemetry/test_client_tracing.py +++ b/tests/client/telemetry/test_client_tracing.py @@ -56,6 +56,7 @@ class TestClientToolTracing: if s.name == "tools/call add" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -95,6 +96,7 @@ class TestClientToolTracing: if s.name == "tools/call failing_tool" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ] # Exactly one client span should exist (no duplicate from call_tool) @@ -154,6 +156,7 @@ class TestClientResourceTracing: if s.name == "resources/read" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -214,6 +217,7 @@ class TestClientPromptTracing: if s.name == "prompts/get welcome" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -257,6 +261,7 @@ class TestClientServerSpanHierarchy: if s.name == "tools/call echo" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -309,6 +314,7 @@ class TestClientServerSpanHierarchy: if s.name == "tools/call add" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -326,16 +332,30 @@ class TestClientServerSpanHierarchy: assert client_span is not None, "Client span should exist" assert server_span is not None, "Server span should exist" - # Verify trace context propagation: server span should be child of client span - # Both should share the same trace_id + # Verify trace context propagation: server span should be a descendant + # of the client span, sharing the same trace_id. SDK v2 emits its own + # intermediate spans (e.g. "MCP send tools/call add") between the FastMCP + # client span and the server span, so the server span's parent is one of + # those SDK spans rather than the client span directly. Assert descendant + # relationship by walking the parent chain instead of a direct parent. assert server_span.context.trace_id == client_span.context.trace_id, ( "Server and client spans should share the same trace_id" ) - # Server span's parent should be the client span + spans_by_id = {s.context.span_id: s for s in spans} assert server_span.parent is not None, "Server span should have a parent" - assert server_span.parent.span_id == client_span.context.span_id, ( - "Server span's parent should be the client span" + current = server_span + found_client_ancestor = False + while current.parent is not None: + parent = spans_by_id.get(current.parent.span_id) + if parent is None: + break + if parent.context.span_id == client_span.context.span_id: + found_client_ancestor = True + break + current = parent + assert found_client_ancestor, ( + "Server span should be a descendant of the client span" ) @@ -376,6 +396,7 @@ class TestClientErrorTracing: if s.name == "tools/call failing_tool" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -423,6 +444,7 @@ class TestClientErrorTracing: if s.name == "resources/read" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -470,6 +492,7 @@ class TestClientErrorTracing: if s.name == "prompts/get failing_prompt" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -513,6 +536,7 @@ class TestClientErrorTracing: if s.name == "tools/call nonexistent" and s.attributes is not None and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -571,14 +595,18 @@ class TestSessionIdOnSpans: spans = trace_exporter.get_finished_spans() - # Find client-side span + # Find the FastMCP client-side span. SDK v2 emits its own native OTel + # spans (also lacking `fastmcp.server.name`), so select on the + # `fastmcp.component.key` attribute that only our client_span sets. client_span = next( ( s for s in spans if s.name == "tools/call echo" and s.attributes is not None + and "fastmcp.component.key" in s.attributes and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) @@ -635,14 +663,17 @@ class TestSessionIdOnSpans: spans = trace_exporter.get_finished_spans() - # Find both spans + # Find both spans. Select the FastMCP client span on + # `fastmcp.component.key` to avoid matching SDK v2's native OTel span. client_span = next( ( s for s in spans if s.name == "tools/call echo" and s.attributes is not None + and "fastmcp.component.key" in s.attributes and "fastmcp.server.name" not in s.attributes + and "fastmcp.component.key" in s.attributes ), None, ) diff --git a/tests/client/test_elicitation.py b/tests/client/test_elicitation.py index 2318efe98..1db306077 100644 --- a/tests/client/test_elicitation.py +++ b/tests/client/test_elicitation.py @@ -3,7 +3,7 @@ from enum import Enum from typing import Any, Literal, cast import pytest -from mcp.types import ElicitRequestFormParams, ElicitRequestParams +from mcp_types import ElicitRequestFormParams, ElicitRequestParams from pydantic import BaseModel from typing_extensions import TypedDict @@ -108,7 +108,7 @@ async def test_elicitation_handler_parameters(): assert captured_params["message"] == "Test message" assert "ScalarElicitationType" in str(captured_params["response_type"]) - assert captured_params["params"].requestedSchema == { + assert captured_params["params"].requested_schema == { "properties": {"value": {"title": "Value", "type": "integer"}}, "required": ["value"], "title": "ScalarElicitationType", @@ -135,7 +135,7 @@ async def test_elicitation_response_title_and_description_on_scalar(): return "no answer" async def elicitation_handler(message, response_type, params, ctx): - captured_schema.update(params.requestedSchema) + captured_schema.update(params.requested_schema) return ElicitResult(action="accept", content={"value": True}) async with Client(mcp, elicitation_handler=elicitation_handler) as client: @@ -164,7 +164,7 @@ async def test_elicitation_response_title_on_dict_shorthand(): return "ok" if isinstance(result, AcceptedElicitation) else "none" async def elicitation_handler(message, response_type, params, ctx): - captured_schema.update(params.requestedSchema) + captured_schema.update(params.requested_schema) return ElicitResult(action="accept", content={"value": "low"}) async with Client(mcp, elicitation_handler=elicitation_handler) as client: @@ -188,7 +188,7 @@ async def test_elicitation_response_title_on_list_shorthand(): return "ok" if isinstance(result, AcceptedElicitation) else "none" async def elicitation_handler(message, response_type, params, ctx): - captured_schema.update(params.requestedSchema) + captured_schema.update(params.requested_schema) return ElicitResult(action="accept", content={"value": "red"}) async with Client(mcp, elicitation_handler=elicitation_handler) as client: @@ -302,7 +302,7 @@ class TestScalarResponseTypes: message, response_type, params: ElicitRequestParams, ctx ): assert isinstance(params, ElicitRequestFormParams) - assert params.requestedSchema == {"type": "object", "properties": {}} + assert params.requested_schema == {"type": "object", "properties": {}} assert response_type is None return ElicitResult(action="accept") @@ -612,7 +612,7 @@ async def test_structured_response_type( ) # Verify the schema has the dataclass fields (available in params) - schema = params.requestedSchema + schema = params.requested_schema assert schema["type"] == "object" assert "name" in schema["properties"] assert "age" in schema["properties"] diff --git a/tests/client/test_elicitation_enums.py b/tests/client/test_elicitation_enums.py index d67e2b4f1..baa281edd 100644 --- a/tests/client/test_elicitation_enums.py +++ b/tests/client/test_elicitation_enums.py @@ -170,7 +170,7 @@ async def test_dict_based_titled_single_select(): async def elicitation_handler(message, response_type, params, ctx): # Verify schema follows SEP-1330 pattern with type: "string" - schema = params.requestedSchema + schema = params.requested_schema assert schema["type"] == "object" assert "value" in schema["properties"] value_schema = schema["properties"]["value"] @@ -205,7 +205,7 @@ async def test_list_list_multi_select_untitled(): async def elicitation_handler(message, response_type, params, ctx): # Verify schema has array with enum pattern - schema = params.requestedSchema + schema = params.requested_schema assert schema["type"] == "object" assert "value" in schema["properties"] value_schema = schema["properties"]["value"] @@ -243,7 +243,7 @@ async def test_list_dict_multi_select_titled(): async def elicitation_handler(message, response_type, params, ctx): # Verify schema has array with SEP-1330 compliant items (anyOf pattern) - schema = params.requestedSchema + schema = params.requested_schema assert schema["type"] == "object" assert "value" in schema["properties"] value_schema = schema["properties"]["value"] @@ -310,7 +310,7 @@ async def test_list_enum_multi_select_direct(): async def elicitation_handler(message, response_type, params, ctx): # Verify schema has array with enum pattern - schema = params.requestedSchema + schema = params.requested_schema assert schema["type"] == "object" assert "value" in schema["properties"] value_schema = schema["properties"]["value"] diff --git a/tests/client/test_logs.py b/tests/client/test_logs.py index 123179b4a..43b6e1d0f 100644 --- a/tests/client/test_logs.py +++ b/tests/client/test_logs.py @@ -2,7 +2,7 @@ import logging import pytest from mcp import LoggingLevel -from mcp.types import LoggingMessageNotificationParams +from mcp_types import LoggingMessageNotificationParams from fastmcp import Client, Context, FastMCP from fastmcp.client.logging import LogMessage, create_log_callback @@ -191,7 +191,7 @@ class TestDefaultLogHandler: """Test that default_log_handler routes server logs to appropriate Python log levels.""" from unittest.mock import MagicMock, patch - from mcp.types import LoggingMessageNotificationParams + from mcp_types import LoggingMessageNotificationParams from fastmcp.client.logging import default_log_handler @@ -242,7 +242,7 @@ class TestDefaultLogHandler: """Test that default_log_handler works when logger name is None.""" from unittest.mock import MagicMock, patch - from mcp.types import LoggingMessageNotificationParams + from mcp_types import LoggingMessageNotificationParams from fastmcp.client.logging import default_log_handler @@ -265,7 +265,7 @@ class TestDefaultLogHandler: """Test that default_log_handler handles dict data correctly.""" from unittest.mock import MagicMock, patch - from mcp.types import LoggingMessageNotificationParams + from mcp_types import LoggingMessageNotificationParams from fastmcp.client.logging import default_log_handler @@ -291,7 +291,7 @@ class TestDefaultLogHandler: """Test that default_log_handler handles list data correctly.""" from unittest.mock import MagicMock, patch - from mcp.types import LoggingMessageNotificationParams + from mcp_types import LoggingMessageNotificationParams from fastmcp.client.logging import default_log_handler @@ -316,7 +316,7 @@ class TestDefaultLogHandler: """Test that default_log_handler handles numeric data correctly.""" from unittest.mock import MagicMock, patch - from mcp.types import LoggingMessageNotificationParams + from mcp_types import LoggingMessageNotificationParams from fastmcp.client.logging import default_log_handler diff --git a/tests/client/test_notifications.py b/tests/client/test_notifications.py index 574abcb1b..0264c8eea 100644 --- a/tests/client/test_notifications.py +++ b/tests/client/test_notifications.py @@ -1,7 +1,7 @@ from dataclasses import dataclass, field from datetime import datetime -import mcp.types +import mcp_types import pytest from fastmcp import Client, FastMCP @@ -14,7 +14,7 @@ class NotificationRecording: """Record of a notification that was received.""" method: str - notification: mcp.types.ServerNotification + notification: mcp_types.ServerNotification timestamp: datetime = field(default_factory=datetime.now) @@ -26,10 +26,11 @@ class RecordingMessageHandler(MessageHandler): self.notifications: list[NotificationRecording] = [] self.name = name - async def on_notification(self, message: mcp.types.ServerNotification) -> None: + async def on_notification(self, message: mcp_types.ServerNotification) -> None: """Record all notifications with timestamp.""" + # SDK v2 delivers notifications unwrapped (no `.root` wrapper). self.notifications.append( - NotificationRecording(method=message.root.method, notification=message) + NotificationRecording(method=message.method, notification=message) ) def get_notifications( @@ -83,7 +84,7 @@ class TestNotificationAPI: @server.tool async def trigger_notification(ctx: Context) -> str: """Send a notification using the async API.""" - await ctx.send_notification(mcp.types.ToolListChangedNotification()) + await ctx.send_notification(mcp_types.ToolListChangedNotification()) return "Notification sent" async with Client(server, message_handler=recording_message_handler) as client: @@ -104,9 +105,9 @@ class TestNotificationAPI: @server.tool async def trigger_all_notifications(ctx: Context) -> str: """Send all notification types.""" - await ctx.send_notification(mcp.types.ToolListChangedNotification()) - await ctx.send_notification(mcp.types.ResourceListChangedNotification()) - await ctx.send_notification(mcp.types.PromptListChangedNotification()) + await ctx.send_notification(mcp_types.ToolListChangedNotification()) + await ctx.send_notification(mcp_types.ResourceListChangedNotification()) + await ctx.send_notification(mcp_types.PromptListChangedNotification()) return "All notifications sent" async with Client(server, message_handler=recording_message_handler) as client: diff --git a/tests/client/test_openapi.py b/tests/client/test_openapi.py index 91bd1466a..fa3dcd3ca 100644 --- a/tests/client/test_openapi.py +++ b/tests/client/test_openapi.py @@ -2,7 +2,7 @@ import json import pytest from fastapi import FastAPI, Request -from mcp.types import TextResourceContents +from mcp_types import TextResourceContents from fastmcp import Client, FastMCP from fastmcp.client.transports import SSETransport, StreamableHttpTransport diff --git a/tests/client/test_sampling.py b/tests/client/test_sampling.py index b23276778..2fc75e311 100644 --- a/tests/client/test_sampling.py +++ b/tests/client/test_sampling.py @@ -3,7 +3,7 @@ from typing import cast from unittest.mock import AsyncMock import pytest -from mcp.types import TextContent +from mcp_types import TextContent from pydantic_core import to_json from fastmcp import Client, Context, FastMCP @@ -85,8 +85,8 @@ async def test_sampling_with_system_prompt(fastmcp_server: FastMCP): def sampling_handler( messages: list[SamplingMessage], params: SamplingParams, ctx: RequestContext ) -> str: - assert params.systemPrompt is not None - return params.systemPrompt + assert params.system_prompt is not None + return params.system_prompt async with Client(fastmcp_server, sampling_handler=sampling_handler) as client: result = await client.call_tool( @@ -185,7 +185,7 @@ class TestSamplingDefaultCapabilities: {"sampling": {"tools": {}}}, ensuring compatibility with servers that don't recognize the tools sub-field (e.g. older Java MCP SDK). """ - import mcp.types as mcp_types + import mcp_types server = FastMCP() @@ -201,7 +201,7 @@ class TestSamplingDefaultCapabilities: async def test_set_sampling_callback_default_capabilities_omit_tools(self): """set_sampling_callback should also default to no tools capability.""" - import mcp.types as mcp_types + import mcp_types server = FastMCP() client = Client(server) @@ -212,7 +212,7 @@ class TestSamplingDefaultCapabilities: async def test_explicit_tools_capability_is_preserved(self): """Explicitly passing tools capability should be respected.""" - import mcp.types as mcp_types + import mcp_types server = FastMCP() @@ -237,7 +237,7 @@ class TestSamplingWithTools: async def test_sampling_with_tools_requires_capability(self): """Test that sampling with tools raises error when client lacks capability.""" - import mcp.types as mcp_types + import mcp_types from fastmcp.exceptions import ToolError diff --git a/tests/client/test_sampling_result_types.py b/tests/client/test_sampling_result_types.py index 879db107f..e581e2582 100644 --- a/tests/client/test_sampling_result_types.py +++ b/tests/client/test_sampling_result_types.py @@ -1,5 +1,5 @@ import pytest -from mcp.types import CreateMessageResultWithTools, TextContent, ToolUseContent +from mcp_types import CreateMessageResultWithTools, TextContent, ToolUseContent from fastmcp import Client, Context, FastMCP from fastmcp.client.sampling import RequestContext, SamplingMessage, SamplingParams @@ -10,7 +10,7 @@ class TestSamplingResultType: async def test_result_type_creates_final_response_tool(self): """Test that result_type creates a synthetic final_response tool.""" - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent from pydantic import BaseModel class MathResult(BaseModel): @@ -36,7 +36,7 @@ class TestSamplingResultType: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -63,7 +63,7 @@ class TestSamplingResultType: async def test_result_type_with_user_tools(self): """Test result_type works alongside user-provided tools.""" - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent from pydantic import BaseModel class SearchResult(BaseModel): @@ -96,7 +96,7 @@ class TestSamplingResultType: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: # Second call: call final_response @@ -115,7 +115,7 @@ class TestSamplingResultType: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -138,7 +138,7 @@ class TestSamplingResultType: async def test_result_type_validation_error_retries(self): """Test that validation errors are sent back to LLM for retry.""" - from mcp.types import ( + from mcp_types import ( CreateMessageResultWithTools, ToolResultContent, ToolUseContent, @@ -168,7 +168,7 @@ class TestSamplingResultType: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: # Second call: valid type after seeing error @@ -183,7 +183,7 @@ class TestSamplingResultType: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -218,7 +218,7 @@ class TestSamplingResultType: tool_result = msg.content break assert tool_result is not None - assert tool_result.isError is True + assert tool_result.is_error is True assert isinstance(tool_result.content[0], TextContent) error_text = tool_result.content[0].text assert "Validation error" in error_text @@ -228,7 +228,7 @@ class TestSamplingResultType: async def test_sampling_result_has_text_and_history(self): """Test that SamplingResult has text, result, and history attributes.""" - from mcp.types import CreateMessageResultWithTools + from mcp_types import CreateMessageResultWithTools def sampling_handler( messages: list[SamplingMessage], params: SamplingParams, ctx: RequestContext @@ -237,7 +237,7 @@ class TestSamplingResultType: role="assistant", content=[TextContent(type="text", text="Hello world")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -262,7 +262,7 @@ class TestSampleStep: async def test_sample_step_basic(self): """Test basic sample_step returns text response.""" - from mcp.types import CreateMessageResultWithTools + from mcp_types import CreateMessageResultWithTools def sampling_handler( messages: list[SamplingMessage], params: SamplingParams, ctx: RequestContext @@ -271,7 +271,7 @@ class TestSampleStep: role="assistant", content=[TextContent(type="text", text="Hello from step")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -290,7 +290,7 @@ class TestSampleStep: async def test_sample_step_with_tool_execution(self): """Test sample_step executes tools by default.""" - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent call_count = 0 @@ -316,14 +316,14 @@ class TestSampleStep: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Done")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -349,7 +349,7 @@ class TestSampleStep: async def test_sample_step_execute_tools_false(self): """Test sample_step with execute_tools=False doesn't execute tools.""" - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent tool_executed = False @@ -373,7 +373,7 @@ class TestSampleStep: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -400,7 +400,7 @@ class TestSampleStep: async def test_sample_step_history_includes_assistant_message(self): """Test that history includes assistant message when execute_tools=False.""" - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent def sampling_handler( messages: list[SamplingMessage], params: SamplingParams, ctx: RequestContext @@ -416,7 +416,7 @@ class TestSampleStep: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -448,18 +448,18 @@ class TestTextResponseRetry: @staticmethod def _text_reply(text: str = "some text"): - from mcp.types import CreateMessageResultWithTools + from mcp_types import CreateMessageResultWithTools return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text=text)], model="m", - stopReason="endTurn", + stop_reason="endTurn", ) @staticmethod def _tool_reply(value: int): - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent return CreateMessageResultWithTools( role="assistant", @@ -472,7 +472,7 @@ class TestTextResponseRetry: ) ], model="m", - stopReason="toolUse", + stop_reason="toolUse", ) async def test_text_response_then_success(self): @@ -562,7 +562,7 @@ def _final_response(call_id: str, input_data: dict) -> CreateMessageResultWithTo ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) @@ -576,7 +576,7 @@ def _tool_call( ToolUseContent(type="tool_use", id=call_id, name=name, input=input_data) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) diff --git a/tests/client/test_sampling_tool_loop.py b/tests/client/test_sampling_tool_loop.py index 7b3c2e9ad..809e58ed8 100644 --- a/tests/client/test_sampling_tool_loop.py +++ b/tests/client/test_sampling_tool_loop.py @@ -1,6 +1,6 @@ from typing import cast -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import Client, Context, FastMCP from fastmcp.client.sampling import RequestContext, SamplingMessage, SamplingParams @@ -12,7 +12,7 @@ class TestAutomaticToolLoop: async def test_automatic_tool_loop_executes_tools(self): """Test that ctx.sample() automatically executes tool calls.""" - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent call_count = 0 tool_was_called = False @@ -42,7 +42,7 @@ class TestAutomaticToolLoop: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: # Second call: return final response @@ -50,7 +50,7 @@ class TestAutomaticToolLoop: role="assistant", content=[TextContent(type="text", text="The weather is sunny!")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -75,7 +75,7 @@ class TestAutomaticToolLoop: async def test_automatic_tool_loop_multiple_tools(self): """Test that multiple tool calls in one response are all executed.""" - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent executed_tools: list[str] = [] @@ -110,14 +110,14 @@ class TestAutomaticToolLoop: ), ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Done!")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -135,7 +135,7 @@ class TestAutomaticToolLoop: async def test_automatic_tool_loop_handles_unknown_tool(self): """Test that unknown tool names result in error being passed to LLM.""" - from mcp.types import ( + from mcp_types import ( CreateMessageResultWithTools, ToolResultContent, ToolUseContent, @@ -165,14 +165,14 @@ class TestAutomaticToolLoop: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Handled error")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -201,7 +201,7 @@ class TestAutomaticToolLoop: tool_result = msg.content break assert tool_result is not None - assert tool_result.isError is True + assert tool_result.is_error is True # Content is list of TextContent objects assert isinstance(tool_result.content[0], TextContent) error_text = tool_result.content[0].text @@ -210,7 +210,7 @@ class TestAutomaticToolLoop: async def test_automatic_tool_loop_handles_tool_exception(self): """Test that tool exceptions are caught and passed to LLM as errors.""" - from mcp.types import ( + from mcp_types import ( CreateMessageResultWithTools, ToolResultContent, ToolUseContent, @@ -239,14 +239,14 @@ class TestAutomaticToolLoop: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Handled error")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -275,7 +275,7 @@ class TestAutomaticToolLoop: tool_result = msg.content break assert tool_result is not None - assert tool_result.isError is True + assert tool_result.is_error is True # Content is list of TextContent objects assert isinstance(tool_result.content[0], TextContent) error_text = tool_result.content[0].text @@ -287,7 +287,7 @@ class TestAutomaticToolLoop: import asyncio import time - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent execution_order: list[tuple[str, float]] = [] @@ -333,14 +333,14 @@ class TestAutomaticToolLoop: ), ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Done!")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -367,7 +367,7 @@ class TestAutomaticToolLoop: import asyncio import time - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent execution_times: dict[str, dict[str, float]] = {} @@ -411,14 +411,14 @@ class TestAutomaticToolLoop: ), ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Done!")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -447,7 +447,7 @@ class TestAutomaticToolLoop: import asyncio import time - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent execution_order: list[tuple[str, float]] = [] @@ -491,14 +491,14 @@ class TestAutomaticToolLoop: ), ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Done!")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -533,7 +533,7 @@ class TestAutomaticToolLoop: import asyncio import time - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent execution_order: list[tuple[str, float]] = [] @@ -577,14 +577,14 @@ class TestAutomaticToolLoop: ), ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Done!")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -620,7 +620,7 @@ class TestAutomaticToolLoop: async def test_concurrent_tool_execution_error_handling(self): """Test that errors are captured per-tool in parallel execution.""" - from mcp.types import ( + from mcp_types import ( CreateMessageResultWithTools, ToolResultContent, ToolUseContent, @@ -651,14 +651,14 @@ class TestAutomaticToolLoop: ), ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Handled errors")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -682,14 +682,14 @@ class TestAutomaticToolLoop: tool_results = cast(list[ToolResultContent], tool_result_message.content) assert len(tool_results) == 2 # One should be success, one should be error - assert any(not r.isError for r in tool_results) - assert any(r.isError for r in tool_results) + assert any(not r.is_error for r in tool_results) + assert any(r.is_error for r in tool_results) async def test_concurrent_tool_result_order_preserved(self): """Test that tool results maintain the same order as tool calls.""" import asyncio - from mcp.types import ( + from mcp_types import ( CreateMessageResultWithTools, ToolResultContent, ToolUseContent, @@ -732,14 +732,14 @@ class TestAutomaticToolLoop: ), ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) else: return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="Done!")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) @@ -761,9 +761,9 @@ class TestAutomaticToolLoop: tool_result_message = messages_received[1][-1] tool_results = cast(list[ToolResultContent], tool_result_message.content) assert len(tool_results) == 3 - assert tool_results[0].toolUseId == "call_1" - assert tool_results[1].toolUseId == "call_2" - assert tool_results[2].toolUseId == "call_3" + assert tool_results[0].tool_use_id == "call_1" + assert tool_results[1].tool_use_id == "call_2" + assert tool_results[2].tool_use_id == "call_3" # Check values are correct result_texts = [cast(TextContent, r.content[0]).text for r in tool_results] assert result_texts == ["1", "2", "3"] diff --git a/tests/client/test_slim_package_boundaries.py b/tests/client/test_slim_package_boundaries.py index 5c6a4b073..5f59b6b3c 100644 --- a/tests/client/test_slim_package_boundaries.py +++ b/tests/client/test_slim_package_boundaries.py @@ -2,6 +2,9 @@ from __future__ import annotations import builtins import contextlib +import subprocess +import sys +import textwrap import types from collections.abc import Mapping, Sequence from typing import Any, cast @@ -59,3 +62,55 @@ async def test_multiserver_config_requires_server_for_now() -> None: ): async with transport.connect_session(): pass + + +def test_bare_slim_import_needs_only_mcp_types() -> None: + """A bare `fastmcp-slim` install ships `mcp-types` but not the full `mcp` SDK. + + `mcp-types` is a core dependency (it only pulls pydantic + typing-extensions), + while the full `mcp` package lives in the `[mcp]` extra pulled by + `[client]`/`[server]`. With `mcp` absent but `mcp-types` present, `import + fastmcp`, `import fastmcp.settings`, and `import fastmcp.types` must all + succeed, while `fastmcp.FastMCP` and `fastmcp.Client` raise the friendly + install-hint ImportError (they need `mcp.*` from the server/client extras). + """ + script = textwrap.dedent( + """ + import sys + import importlib.abc + + class BlockFullMcp(importlib.abc.MetaPathFinder): + # Block the full `mcp` package but leave `mcp_types` importable, + # exactly as a bare `fastmcp-slim` install would present. + def find_spec(self, name, path, target=None): + if name == "mcp" or name.startswith("mcp."): + raise ImportError(f"blocked: {name}") + return None + + sys.meta_path.insert(0, BlockFullMcp()) + + import fastmcp + import fastmcp.settings + import fastmcp.types + + assert "mcp_types" in sys.modules, "mcp_types should load on a bare install" + assert "mcp" not in sys.modules, "full mcp must not load on a bare install" + + for attr in ("FastMCP", "Client"): + try: + getattr(fastmcp, attr) + except ImportError: + pass + else: + raise AssertionError(f"fastmcp.{attr} should have raised ImportError") + + print("OK") + """ + ) + result = subprocess.run( + [sys.executable, "-c", script], + capture_output=True, + text=True, + ) + assert result.returncode == 0, result.stderr + assert result.stdout.strip().endswith("OK") diff --git a/tests/client/test_sse.py b/tests/client/test_sse.py index 4f9e51f04..eb94faa75 100644 --- a/tests/client/test_sse.py +++ b/tests/client/test_sse.py @@ -3,8 +3,8 @@ import json import sys import pytest -from mcp import McpError -from mcp.types import TextResourceContents +from mcp import MCPError +from mcp_types import TextResourceContents from fastmcp.client import Client from fastmcp.client.transports import SSETransport @@ -161,8 +161,8 @@ async def test_nested_sse_server_resolves_correctly(nested_sse_server: str): class TestTimeout: async def test_timeout(self, sse_server: str): with pytest.raises( - McpError, - match="Timed out while waiting for response to ClientRequest. Waited 0.03 seconds", + MCPError, + match="timed out", ): async with Client( transport=SSETransport(sse_server), @@ -172,7 +172,7 @@ class TestTimeout: async def test_timeout_tool_call(self, sse_server: str): async with Client(transport=SSETransport(sse_server)) as client: - with pytest.raises(McpError, match="Timed out"): + with pytest.raises(MCPError, match="timed out"): await client.call_tool("sleep", {"seconds": 0.1}, timeout=0.03) async def test_timeout_tool_call_overrides_client_timeout_if_lower( @@ -182,7 +182,7 @@ class TestTimeout: transport=SSETransport(sse_server), timeout=2, ) as client: - with pytest.raises(McpError, match="Timed out"): + with pytest.raises(MCPError, match="timed out"): await client.call_tool("sleep", {"seconds": 0.1}, timeout=0.03) async def test_timeout_client_timeout_does_not_override_tool_call_timeout_if_lower( diff --git a/tests/client/test_streamable_http.py b/tests/client/test_streamable_http.py index 9d5fd6616..e4ea6e68b 100644 --- a/tests/client/test_streamable_http.py +++ b/tests/client/test_streamable_http.py @@ -5,8 +5,8 @@ from contextlib import suppress from unittest.mock import AsyncMock, call import pytest -from mcp import McpError -from mcp.types import TextResourceContents +from mcp import MCPError +from mcp_types import TextResourceContents from fastmcp import Context from fastmcp.client import Client @@ -265,8 +265,8 @@ async def test_nested_streamable_http_server_resolves_correctly(nested_server: s class TestTimeout: async def test_timeout(self, streamable_http_server: str): # note this transport behaves differently than others and raises - # McpError from the *client* context - with pytest.raises(McpError, match="Timed out"): + # MCPError from the *client* context + with pytest.raises(MCPError, match="timed out"): async with Client( transport=StreamableHttpTransport(streamable_http_server), timeout=0.02, @@ -277,7 +277,7 @@ class TestTimeout: async with Client( transport=StreamableHttpTransport(streamable_http_server), ) as client: - with pytest.raises(McpError): + with pytest.raises(MCPError): await client.call_tool("sleep", {"seconds": 0.2}, timeout=0.1) async def test_timeout_tool_call_overrides_client_timeout( @@ -287,5 +287,5 @@ class TestTimeout: transport=StreamableHttpTransport(streamable_http_server), timeout=2, ) as client: - with pytest.raises(McpError): + with pytest.raises(MCPError): await client.call_tool("sleep", {"seconds": 0.2}, timeout=0.1) diff --git a/tests/conformance/server.py b/tests/conformance/server.py index d3edcbc82..158b0949e 100644 --- a/tests/conformance/server.py +++ b/tests/conformance/server.py @@ -10,9 +10,9 @@ import json import sys from enum import Enum as PyEnum -import mcp.types -from mcp.types import EmbeddedResource, ImageContent, TextContent -from pydantic import AnyUrl, BaseModel, Field +import mcp_types +from mcp_types import EmbeddedResource, ImageContent, TextContent +from pydantic import BaseModel, Field from fastmcp import FastMCP from fastmcp.exceptions import ToolError @@ -76,9 +76,9 @@ async def test_embedded_resource() -> list: return [ EmbeddedResource( type="resource", - resource=mcp.types.TextResourceContents( - uri=AnyUrl("test://embedded-resource"), - mimeType="text/plain", + resource=mcp_types.TextResourceContents( + uri="test://embedded-resource", + mime_type="text/plain", text="This is an embedded resource content.", ), ) @@ -93,13 +93,13 @@ async def test_multiple_content_types() -> list: ImageContent( type="image", data=base64.b64encode(_1X1_PNG).decode(), - mimeType="image/png", + mime_type="image/png", ), EmbeddedResource( type="resource", - resource=mcp.types.TextResourceContents( - uri=AnyUrl("test://mixed-content-resource"), - mimeType="application/json", + resource=mcp_types.TextResourceContents( + uri="test://mixed-content-resource", + mime_type="application/json", text='{"test":"data","value":123}', ), ), @@ -185,7 +185,7 @@ async def test_elicitation_sep1330_enums(ctx: Context) -> str: """Tests elicitation with enum schema improvements per SEP-1330.""" result = await ctx.session.elicit( message="Please select options from the enum fields", - requestedSchema={ + requested_schema={ "type": "object", "properties": { "untitledSingle": { @@ -347,9 +347,9 @@ async def test_prompt_with_embedded_resource(resourceUri: str) -> list: Message( EmbeddedResource( type="resource", - resource=mcp.types.TextResourceContents( - uri=AnyUrl(resourceUri), - mimeType="text/plain", + resource=mcp_types.TextResourceContents( + uri=resourceUri, + mime_type="text/plain", text=f"Content of resource {resourceUri}", ), ) @@ -365,7 +365,7 @@ async def test_prompt_with_image() -> list: ImageContent( type="image", data=base64.b64encode(_1X1_PNG).decode(), - mimeType="image/png", + mime_type="image/png", ) ), Message("Please analyze the image above."), diff --git a/tests/conftest.py b/tests/conftest.py index 1edf55c60..51ee2c26d 100644 --- a/tests/conftest.py +++ b/tests/conftest.py @@ -22,6 +22,33 @@ if sys.platform == "win32": asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy()) +def make_server_request_context( + *, + method: str = "tools/list", + params: dict[str, Any] | None = None, +) -> Any: + """Build a minimal SDK ServerRequestContext for direct handler unit tests. + + The v2 SDK hands handlers a ``ServerRequestContext`` argument. Tests that + invoke FastMCP's ``_on_*`` handlers directly (without a live session) use + this to construct a stand-in context that ``bind_request_context`` accepts. + """ + from unittest.mock import MagicMock + + from mcp.server.context import ServerRequestContext + + return ServerRequestContext( + session=MagicMock(), + lifespan_context={}, + protocol_version="2025-06-18", + method=method, + params=params, + request_id=0, + meta=None, + request=None, + ) + + def pytest_collection_modifyitems(items): """Automatically mark tests in integration_tests folder with 'integration' marker.""" for item in items: @@ -198,13 +225,12 @@ def tool_server(): """Fixture that creates a FastMCP server with comprehensive tool set for provider tests.""" import base64 - from mcp.types import ( + from mcp_types import ( BlobResourceContents, EmbeddedResource, ImageContent, TextContent, ) - from pydantic import AnyUrl from fastmcp import FastMCP from fastmcp.utilities.types import Audio, File, Image @@ -239,13 +265,15 @@ def tool_server(): def mixed_content_tool() -> list[TextContent | ImageContent | EmbeddedResource]: return [ TextContent(type="text", text="Hello"), - ImageContent(type="image", data="abc", mimeType="application/octet-stream"), + ImageContent( + type="image", data="abc", mime_type="application/octet-stream" + ), EmbeddedResource( type="resource", resource=BlobResourceContents( blob=base64.b64encode(b"abc").decode(), - mimeType="application/octet-stream", - uri=AnyUrl("file:///test.bin"), + mime_type="application/octet-stream", + uri="file:///test.bin", ), ), ] diff --git a/tests/contrib/test_bulk_tool_caller.py b/tests/contrib/test_bulk_tool_caller.py index 24873f4ea..97ee6a12e 100644 --- a/tests/contrib/test_bulk_tool_caller.py +++ b/tests/contrib/test_bulk_tool_caller.py @@ -2,7 +2,7 @@ from typing import Any import pytest from inline_snapshot import snapshot -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.contrib.bulk_tool_caller.bulk_tool_caller import ( @@ -31,7 +31,7 @@ def error_tool_result_factory(arg1: str) -> CallToolRequestResult: "Error calling tool 'error_tool': Error in tool with arg1: " + arg1 ) return CallToolRequestResult( - isError=True, + is_error=True, content=[TextContent(text=formatted_error_text, type="text")], tool="error_tool", arguments={"arg1": arg1}, @@ -46,7 +46,7 @@ async def echo_tool(arg1: str) -> str: def echo_tool_result_factory(arg1: str) -> CallToolRequestResult: """A tool that returns a result based on the input arguments.""" return CallToolRequestResult( - isError=False, + is_error=False, content=[TextContent(text=f"{arg1}", type="text")], tool="echo_tool", arguments={"arg1": arg1}, @@ -60,7 +60,7 @@ async def no_return_tool(arg1: str) -> None: def no_return_tool_result_factory(arg1: str) -> CallToolRequestResult: """A tool that returns a result based on the input arguments.""" return CallToolRequestResult( - isError=False, + is_error=False, content=[], tool="no_return_tool", arguments={"arg1": arg1}, @@ -147,7 +147,7 @@ async def test_call_tool_bulk_error_stops(bulk_caller_live: BulkToolCaller): text="Error calling tool 'error_tool': Error in tool with arg1: error_value", ) ], - isError=True, + is_error=True, tool="error_tool", arguments={"arg1": "error_value"}, ) @@ -174,7 +174,7 @@ async def test_call_tool_bulk_error_continues(bulk_caller_live: BulkToolCaller): text="Error calling tool 'error_tool': Error in tool with arg1: error_value", ) ], - isError=True, + is_error=True, tool="error_tool", arguments={"arg1": "error_value"}, ), @@ -249,7 +249,7 @@ async def test_call_tools_bulk_error_stops(bulk_caller_live: BulkToolCaller): text="Error calling tool 'error_tool': Error in tool with arg1: error_value", ) ], - isError=True, + is_error=True, tool="error_tool", arguments={"arg1": "error_value"}, ) @@ -275,7 +275,7 @@ async def test_call_tools_bulk_error_continues(bulk_caller_live: BulkToolCaller) text="Error calling tool 'error_tool': Error in tool with arg1: error_value", ) ], - isError=True, + is_error=True, tool="error_tool", arguments={"arg1": "error_value"}, ), @@ -309,7 +309,7 @@ async def test_call_tools_bulk_blocks_self_invocation(bulk_caller_live: BulkTool ), ) ], - isError=True, + is_error=True, tool="call_tools_bulk", arguments={"tool_calls": []}, ), @@ -341,7 +341,7 @@ async def test_call_tool_bulk_blocks_self_invocation(bulk_caller_live: BulkToolC ), ) ], - isError=True, + is_error=True, tool="call_tool_bulk", arguments={"arg1": "value1"}, ) diff --git a/tests/contrib/test_mcp_mixin.py b/tests/contrib/test_mcp_mixin.py index 0d58a05a9..1bce287bf 100644 --- a/tests/contrib/test_mcp_mixin.py +++ b/tests/contrib/test_mcp_mixin.py @@ -276,7 +276,7 @@ class TestMCPMixin: async def test_tool_with_title_and_meta(self): """Test that title (via annotations) and meta arguments are properly passed through.""" - from mcp.types import ToolAnnotations + from mcp_types import ToolAnnotations mcp = FastMCP() diff --git a/tests/deprecated/test_import_server.py b/tests/deprecated/test_import_server.py index 3ee808a8b..d43382ad6 100644 --- a/tests/deprecated/test_import_server.py +++ b/tests/deprecated/test_import_server.py @@ -1,7 +1,7 @@ import json from urllib.parse import quote -from mcp.types import TextContent, TextResourceContents +from mcp_types import TextContent, TextResourceContents from fastmcp.client.client import Client from fastmcp.server.server import FastMCP @@ -555,7 +555,7 @@ async def test_import_conflict_resolution_templates(): async with Client(main_app) as client: # The later imported server should win templates = await client.list_resource_templates() - template_uris = [t.uriTemplate for t in templates] + template_uris = [t.uri_template for t in templates] assert "users://{user_id}/profile" in template_uris assert ( template_uris.count("users://{user_id}/profile") == 1 diff --git a/tests/deprecated/test_tool_injection_middleware.py b/tests/deprecated/test_tool_injection_middleware.py index af4f5df1c..bd0209a80 100644 --- a/tests/deprecated/test_tool_injection_middleware.py +++ b/tests/deprecated/test_tool_injection_middleware.py @@ -2,8 +2,8 @@ import pytest from inline_snapshot import snapshot -from mcp.types import TextContent -from mcp.types import Tool as SDKTool +from mcp_types import TextContent +from mcp_types import Tool as SDKTool from fastmcp import FastMCP from fastmcp.client import Client @@ -69,7 +69,7 @@ class TestPromptToolMiddleware: [ TextContent( type="text", - text='[{"name":"greeting","title":null,"description":"Generate a greeting message.","arguments":[{"name":"name","description":null,"required":true}],"icons":null,"_meta":{"fastmcp":{"tags":[]}}},{"name":"farewell","title":null,"description":"Generate a farewell message.","arguments":[{"name":"name","description":null,"required":true}],"icons":null,"_meta":{"fastmcp":{"tags":[]}}}]', + text='[{"name":"greeting","title":null,"description":"Generate a greeting message.","arguments":[{"name":"name","title":null,"description":null,"required":true}],"icons":null,"_meta":{"fastmcp":{"tags":[]}}},{"name":"farewell","title":null,"description":"Generate a farewell message.","arguments":[{"name":"name","title":null,"description":null,"required":true}],"icons":null,"_meta":{"fastmcp":{"tags":[]}}}]', ) ] ) @@ -81,7 +81,12 @@ class TestPromptToolMiddleware: "title": None, "description": "Generate a greeting message.", "arguments": [ - {"name": "name", "description": None, "required": True} + { + "name": "name", + "title": None, + "description": None, + "required": True, + } ], "icons": None, "_meta": {"fastmcp": {"tags": []}}, @@ -91,7 +96,12 @@ class TestPromptToolMiddleware: "title": None, "description": "Generate a farewell message.", "arguments": [ - {"name": "name", "description": None, "required": True} + { + "name": "name", + "title": None, + "description": None, + "required": True, + } ], "icons": None, "_meta": {"fastmcp": {"tags": []}}, @@ -115,7 +125,7 @@ class TestPromptToolMiddleware: [ TextContent( type="text", - text='{"_meta":null,"description":"Generate a greeting message.","messages":[{"role":"user","content":{"type":"text","text":"Hello, World!","annotations":null,"_meta":null}}]}', + text='{"_meta":null,"description":"Generate a greeting message.","messages":[{"role":"user","content":{"type":"text","text":"Hello, World!","annotations":null,"_meta":null}}],"resultType":"complete"}', ) ] ) @@ -135,6 +145,7 @@ class TestPromptToolMiddleware: }, } ], + "resultType": "complete", } ) diff --git a/tests/deprecated/test_tool_serializer.py b/tests/deprecated/test_tool_serializer.py index 640441b38..cccc95665 100644 --- a/tests/deprecated/test_tool_serializer.py +++ b/tests/deprecated/test_tool_serializer.py @@ -8,7 +8,7 @@ import warnings import pytest from inline_snapshot import snapshot -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.contrib.mcp_mixin import mcp_tool diff --git a/tests/experimental/transforms/test_code_mode.py b/tests/experimental/transforms/test_code_mode.py index 3e94c24b2..557f33c8b 100644 --- a/tests/experimental/transforms/test_code_mode.py +++ b/tests/experimental/transforms/test_code_mode.py @@ -5,7 +5,7 @@ import json from typing import Any import pytest -from mcp.types import ImageContent, TextContent +from mcp_types import ImageContent, TextContent from fastmcp import Client, FastMCP from fastmcp.exceptions import ToolError @@ -656,7 +656,7 @@ async def test_code_mode_execute_non_text_content_stringified() -> None: @mcp.tool def image_tool() -> ImageContent: - return ImageContent(type="image", data="base64data", mimeType="image/png") + return ImageContent(type="image", data="base64data", mime_type="image/png") mcp.add_transform(CodeMode(sandbox_provider=_UnsafeTestSandboxProvider())) diff --git a/tests/experimental/transforms/test_code_mode_discovery.py b/tests/experimental/transforms/test_code_mode_discovery.py index f49e32a08..932257ccd 100644 --- a/tests/experimental/transforms/test_code_mode_discovery.py +++ b/tests/experimental/transforms/test_code_mode_discovery.py @@ -1,7 +1,7 @@ import json from typing import Any -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.experimental.transforms.code_mode import ( diff --git a/tests/integration_tests/auth/test_github_provider_integration.py b/tests/integration_tests/auth/test_github_provider_integration.py index 47d9c944a..990bba096 100644 --- a/tests/integration_tests/auth/test_github_provider_integration.py +++ b/tests/integration_tests/auth/test_github_provider_integration.py @@ -337,8 +337,12 @@ async def test_github_oauth_server_metadata(github_server: str): async def test_github_oauth_unauthorized_access(github_server: str): - """Test that unauthenticated requests are rejected.""" - import httpx + """Test that unauthenticated requests are rejected. + + SDK v2 surfaces the server's 401 as an MCPError ("Server returned an error + response") rather than re-raising the raw httpx.HTTPStatusError. + """ + from mcp.shared.exceptions import MCPError from fastmcp.client.transports import StreamableHttpTransport @@ -346,7 +350,7 @@ async def test_github_oauth_unauthorized_access(github_server: str): unauthorized_client = Client(transport=StreamableHttpTransport(github_server)) # Attempt to connect without authentication should fail - with pytest.raises(httpx.HTTPStatusError, match="401 Unauthorized"): + with pytest.raises(MCPError, match="error response"): async with unauthorized_client: pass diff --git a/tests/integration_tests/test_github_mcp_remote.py b/tests/integration_tests/test_github_mcp_remote.py index 552fc28dd..b6190afc7 100644 --- a/tests/integration_tests/test_github_mcp_remote.py +++ b/tests/integration_tests/test_github_mcp_remote.py @@ -2,8 +2,8 @@ import json import os import pytest -from mcp import McpError -from mcp.types import Resource, TextContent, Tool +from mcp import MCPError +from mcp_types import Resource, TextContent, Tool from fastmcp import Client from fastmcp.client import StreamableHttpTransport @@ -64,8 +64,8 @@ class TestGithubMCPRemote: assert isinstance(tool, Tool) assert len(tool.name) > 0 assert tool.description is not None and len(tool.description) > 0 - assert isinstance(tool.inputSchema, dict) - assert len(tool.inputSchema) > 0 + assert isinstance(tool.input_schema, dict) + assert len(tool.input_schema) > 0 async def test_list_resources( self, streamable_http_client: Client[StreamableHttpTransport] @@ -96,7 +96,7 @@ class TestGithubMCPRemote: """Test calling a non-existing tool""" async with streamable_http_client: assert streamable_http_client.is_connected() - with pytest.raises(McpError, match=r"unknown tool|tool not found"): + with pytest.raises(MCPError, match=r"unknown tool|tool not found"): await streamable_http_client.call_tool("foo") async def test_call_tool_list_commits( diff --git a/tests/prompts/test_prompt.py b/tests/prompts/test_prompt.py index 7c3125d57..201632e01 100644 --- a/tests/prompts/test_prompt.py +++ b/tests/prompts/test_prompt.py @@ -1,6 +1,5 @@ import pytest -from mcp.types import EmbeddedResource, TextResourceContents -from pydantic import FileUrl +from mcp_types import EmbeddedResource, TextResourceContents from fastmcp.prompts.base import ( Message, @@ -112,9 +111,9 @@ class TestRenderPrompt: content=EmbeddedResource( type="resource", resource=TextResourceContents( - uri=FileUrl("file://file.txt"), + uri="file://file.txt", text="File contents", - mimeType="text/plain", + mime_type="text/plain", ), ), role="user", @@ -128,9 +127,9 @@ class TestRenderPrompt: content=EmbeddedResource( type="resource", resource=TextResourceContents( - uri=FileUrl("file://file.txt"), + uri="file://file.txt", text="File contents", - mimeType="text/plain", + mime_type="text/plain", ), ), role="user", @@ -147,9 +146,9 @@ class TestRenderPrompt: content=EmbeddedResource( type="resource", resource=TextResourceContents( - uri=FileUrl("file://file.txt"), + uri="file://file.txt", text="File contents", - mimeType="text/plain", + mime_type="text/plain", ), ), role="user", @@ -165,9 +164,9 @@ class TestRenderPrompt: content=EmbeddedResource( type="resource", resource=TextResourceContents( - uri=FileUrl("file://file.txt"), + uri="file://file.txt", text="File contents", - mimeType="text/plain", + mime_type="text/plain", ), ), role="user", @@ -184,9 +183,9 @@ class TestRenderPrompt: content=EmbeddedResource( type="resource", resource=TextResourceContents( - uri=FileUrl("file://file.txt"), + uri="file://file.txt", text="File contents", - mimeType="text/plain", + mime_type="text/plain", ), ), role="user", @@ -200,9 +199,9 @@ class TestRenderPrompt: content=EmbeddedResource( type="resource", resource=TextResourceContents( - uri=FileUrl("file://file.txt"), + uri="file://file.txt", text="File contents", - mimeType="text/plain", + mime_type="text/plain", ), ), role="user", @@ -580,7 +579,7 @@ class TestPromptArgumentDescriptions: class TestMessage: def test_message_string_content(self): """Test Message with string content.""" - from mcp.types import TextContent + from mcp_types import TextContent msg = Message("Hello, world!") assert msg.role == "user" @@ -589,7 +588,7 @@ class TestMessage: def test_message_with_role(self): """Test Message with explicit role.""" - from mcp.types import TextContent + from mcp_types import TextContent msg = Message("I can help.", role="assistant") assert msg.role == "assistant" @@ -598,7 +597,7 @@ class TestMessage: def test_message_auto_serializes_dict(self): """Test Message auto-serializes dicts to JSON.""" - from mcp.types import TextContent + from mcp_types import TextContent msg = Message({"key": "value", "nested": {"a": 1}}) assert msg.role == "user" @@ -608,7 +607,7 @@ class TestMessage: def test_message_auto_serializes_list(self): """Test Message auto-serializes lists to JSON.""" - from mcp.types import TextContent + from mcp_types import TextContent msg = Message(["item1", "item2", "item3"]) assert isinstance(msg.content, TextContent) @@ -616,7 +615,7 @@ class TestMessage: def test_message_to_mcp_prompt_message(self): """Test conversion to MCP PromptMessage.""" - from mcp.types import TextContent + from mcp_types import TextContent msg = Message("Hello", role="assistant") mcp_msg = msg.to_mcp_prompt_message() @@ -626,29 +625,29 @@ class TestMessage: def test_message_passthrough_image_content(self): """Test Message passes through ImageContent without JSON serialization.""" - from mcp.types import ImageContent + from mcp_types import ImageContent - img = ImageContent(type="image", data="base64data", mimeType="image/png") + img = ImageContent(type="image", data="base64data", mime_type="image/png") msg = Message(img, role="user") assert isinstance(msg.content, ImageContent) assert msg.content.data == "base64data" - assert msg.content.mimeType == "image/png" + assert msg.content.mime_type == "image/png" def test_message_passthrough_audio_content(self): """Test Message passes through AudioContent without JSON serialization.""" - from mcp.types import AudioContent + from mcp_types import AudioContent - audio = AudioContent(type="audio", data="base64audio", mimeType="audio/wav") + audio = AudioContent(type="audio", data="base64audio", mime_type="audio/wav") msg = Message(audio, role="user") assert isinstance(msg.content, AudioContent) assert msg.content.data == "base64audio" - assert msg.content.mimeType == "audio/wav" + assert msg.content.mime_type == "audio/wav" def test_message_image_content_to_mcp_prompt_message(self): """Test that ImageContent round-trips through to_mcp_prompt_message.""" - from mcp.types import ImageContent + from mcp_types import ImageContent - img = ImageContent(type="image", data="base64data", mimeType="image/png") + img = ImageContent(type="image", data="base64data", mime_type="image/png") msg = Message(img, role="user") mcp_msg = msg.to_mcp_prompt_message() assert isinstance(mcp_msg.content, ImageContent) @@ -658,7 +657,7 @@ class TestMessage: class TestPromptResult: def test_promptresult_from_string(self): """Test PromptResult accepts string and wraps as Message.""" - from mcp.types import TextContent + from mcp_types import TextContent result = PromptResult("Hello!") assert len(result.messages) == 1 diff --git a/tests/resources/test_function_resources.py b/tests/resources/test_function_resources.py index 2680b42e3..20561a951 100644 --- a/tests/resources/test_function_resources.py +++ b/tests/resources/test_function_resources.py @@ -261,7 +261,7 @@ class TestResourceContentToMcp: assert hasattr(mcp_content, "text") assert mcp_content.text == "hello world" - assert mcp_content.mimeType == "text/html" + assert mcp_content.mime_type == "text/html" assert mcp_content.meta == {"csp": "script-src 'self'"} def test_binary_content_to_mcp(self): @@ -275,18 +275,18 @@ class TestResourceContentToMcp: assert hasattr(mcp_content, "blob") assert mcp_content.blob == "AAEC" # base64 of \x00\x01\x02 - assert mcp_content.mimeType == "application/octet-stream" + assert mcp_content.mime_type == "application/octet-stream" assert mcp_content.meta == {"encoding": "raw"} def test_default_mime_types(self): """Test default mime types are applied correctly.""" text_rc = ResourceContent(content="text") text_mcp = text_rc.to_mcp_resource_contents("resource://test") - assert text_mcp.mimeType == "text/plain" + assert text_mcp.mime_type == "text/plain" binary_rc = ResourceContent(content=b"binary") binary_mcp = binary_rc.to_mcp_resource_contents("resource://test") - assert binary_mcp.mimeType == "application/octet-stream" + assert binary_mcp.mime_type == "application/octet-stream" def test_none_meta(self): """Test that None meta is handled correctly.""" diff --git a/tests/resources/test_resource_template_meta.py b/tests/resources/test_resource_template_meta.py index 08a1afe56..3b65f9c4e 100644 --- a/tests/resources/test_resource_template_meta.py +++ b/tests/resources/test_resource_template_meta.py @@ -1,4 +1,4 @@ -from mcp.types import Annotations, Icon +from mcp_types import Annotations, Icon from fastmcp import FastMCP from fastmcp.resources import ResourceTemplate @@ -46,7 +46,7 @@ class TestResourceTemplateFieldPreservation: name="t", title="Human Title", meta={"owner": "team-a"}, - icons=[Icon(src="https://example.com/icon.png", mimeType="image/png")], + icons=[Icon(src="https://example.com/icon.png", mime_type="image/png")], annotations=Annotations(priority=0.5, audience=["user"]), ) @@ -84,7 +84,7 @@ class TestResourceTemplateFieldPreservation: "data://{param}", title="Sub Title", meta={"owner": "team-b"}, - icons=[Icon(src="https://example.com/s.png", mimeType="image/png")], + icons=[Icon(src="https://example.com/s.png", mime_type="image/png")], annotations=Annotations(priority=0.9), tags={"alpha"}, ) diff --git a/tests/resources/test_resources.py b/tests/resources/test_resources.py index 7d7b70b64..ad72b6168 100644 --- a/tests/resources/test_resources.py +++ b/tests/resources/test_resources.py @@ -1,4 +1,4 @@ -import mcp.types +import mcp_types import pytest from pydantic import AnyUrl, BaseModel @@ -174,9 +174,9 @@ class TestResourceContent: content="hello", mime_type="text/plain", meta={"k": "v"} ) mcp_content = content.to_mcp_resource_contents("resource://test") - assert isinstance(mcp_content, mcp.types.TextResourceContents) + assert isinstance(mcp_content, mcp_types.TextResourceContents) assert mcp_content.text == "hello" - assert mcp_content.mimeType == "text/plain" + assert mcp_content.mime_type == "text/plain" assert str(mcp_content.uri) == "resource://test" assert mcp_content.meta == {"k": "v"} @@ -186,9 +186,9 @@ class TestResourceContent: content=b"\x00\x01\x02", mime_type="application/octet-stream" ) mcp_content = content.to_mcp_resource_contents("resource://binary") - assert isinstance(mcp_content, mcp.types.BlobResourceContents) + assert isinstance(mcp_content, mcp_types.BlobResourceContents) assert mcp_content.blob == "AAEC" # base64 of \x00\x01\x02 - assert mcp_content.mimeType == "application/octet-stream" + assert mcp_content.mime_type == "application/octet-stream" class TestResourceResult: @@ -250,9 +250,9 @@ class TestResourceResult: meta={"source": "test"}, ) mcp_result = result.to_mcp_result("resource://test") - assert isinstance(mcp_result, mcp.types.ReadResourceResult) + assert isinstance(mcp_result, mcp_types.ReadResourceResult) assert len(mcp_result.contents) == 1 - assert isinstance(mcp_result.contents[0], mcp.types.TextResourceContents) + assert isinstance(mcp_result.contents[0], mcp_types.TextResourceContents) assert mcp_result.contents[0].text == "hello" assert str(mcp_result.contents[0].uri) == "resource://test" assert mcp_result.meta == {"source": "test"} diff --git a/tests/resources/test_standalone_decorator.py b/tests/resources/test_standalone_decorator.py index c5dd76ec8..ba555f730 100644 --- a/tests/resources/test_standalone_decorator.py +++ b/tests/resources/test_standalone_decorator.py @@ -165,7 +165,7 @@ class TestResourceDecorator: async with Client(mcp) as client: templates = await client.list_resource_templates() - assert any(t.uriTemplate == "users://{user_id}/profile" for t in templates) + assert any(t.uri_template == "users://{user_id}/profile" for t in templates) result = await client.read_resource("users://123/profile") assert "123" in str(result) diff --git a/tests/server/auth/oauth_proxy/test_config.py b/tests/server/auth/oauth_proxy/test_config.py index c5e8e3078..a69330a3e 100644 --- a/tests/server/auth/oauth_proxy/test_config.py +++ b/tests/server/auth/oauth_proxy/test_config.py @@ -108,6 +108,7 @@ class TestResourceURLValidation: await proxy_with_resource_url.authorize(client, params) assert exc_info.value.error == "invalid_target" + assert exc_info.value.error_description is not None assert "Resource does not match" in exc_info.value.error_description async def test_authorize_accepts_matching_resource(self, proxy_with_resource_url): diff --git a/tests/server/auth/providers/test_descope.py b/tests/server/auth/providers/test_descope.py index 7dcfc477f..8a149c903 100644 --- a/tests/server/auth/providers/test_descope.py +++ b/tests/server/auth/providers/test_descope.py @@ -3,8 +3,8 @@ import os from unittest.mock import patch -import httpx import pytest +from mcp import MCPError from fastmcp import Client, FastMCP from fastmcp.client.transports import StreamableHttpTransport @@ -222,12 +222,11 @@ def client_with_headless_oauth(mcp_server_url: str) -> Client: class TestDescopeProviderIntegration: async def test_unauthorized_access(self, mcp_server_url: str): - with pytest.raises(httpx.HTTPStatusError) as exc_info: + # SDK v2 surfaces the server's 401 as a generic MCPError at the client + # boundary rather than re-raising httpx.HTTPStatusError. + with pytest.raises(MCPError): async with Client(mcp_server_url) as client: tools = await client.list_tools() # noqa: F841 - - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() # async def test_authorized_access(self, client_with_headless_oauth: Client): diff --git a/tests/server/auth/providers/test_propelauth.py b/tests/server/auth/providers/test_propelauth.py index f06efe685..2a254d528 100644 --- a/tests/server/auth/providers/test_propelauth.py +++ b/tests/server/auth/providers/test_propelauth.py @@ -5,6 +5,7 @@ from unittest.mock import AsyncMock import httpx import pytest +from mcp import MCPError from pydantic import SecretStr from fastmcp import Client, FastMCP @@ -269,12 +270,11 @@ async def mcp_server_url(): class TestPropelAuthProviderIntegration: async def test_unauthorized_access(self, mcp_server_url: str): - with pytest.raises(httpx.HTTPStatusError) as exc_info: + # SDK v2 surfaces the server's 401 as a generic MCPError at the client + # boundary rather than re-raising httpx.HTTPStatusError. + with pytest.raises(MCPError): async with Client(mcp_server_url) as client: tools = await client.list_tools() # noqa: F841 - - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() async def test_metadata_route_forwards_propelauth_response( diff --git a/tests/server/auth/providers/test_scalekit.py b/tests/server/auth/providers/test_scalekit.py index a47840682..ad1a0858f 100644 --- a/tests/server/auth/providers/test_scalekit.py +++ b/tests/server/auth/providers/test_scalekit.py @@ -2,6 +2,7 @@ import httpx import pytest +from mcp import MCPError from fastmcp import Client, FastMCP from fastmcp.client.transports import StreamableHttpTransport @@ -153,12 +154,11 @@ def client_with_headless_oauth(mcp_server_url: str) -> Client: class TestScalekitProviderIntegration: async def test_unauthorized_access(self, mcp_server_url: str): - with pytest.raises(httpx.HTTPStatusError) as exc_info: + # SDK v2 surfaces the server's 401 as a generic MCPError at the client + # boundary rather than re-raising httpx.HTTPStatusError. + with pytest.raises(MCPError): async with Client(mcp_server_url) as client: tools = await client.list_tools() # noqa: F841 - - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() async def test_metadata_route_forwards_scalekit_response( diff --git a/tests/server/auth/providers/test_supabase.py b/tests/server/auth/providers/test_supabase.py index 1537bff04..b15c613e4 100644 --- a/tests/server/auth/providers/test_supabase.py +++ b/tests/server/auth/providers/test_supabase.py @@ -2,8 +2,8 @@ from collections.abc import Generator -import httpx import pytest +from mcp import MCPError from fastmcp import Client, FastMCP from fastmcp.client.transports import StreamableHttpTransport @@ -195,12 +195,11 @@ def client_with_headless_oauth( class TestSupabaseProviderIntegration: async def test_unauthorized_access(self, mcp_server_url: str): - with pytest.raises(httpx.HTTPStatusError) as exc_info: + # SDK v2 surfaces the server's 401 as a generic MCPError at the client + # boundary rather than re-raising httpx.HTTPStatusError. + with pytest.raises(MCPError): async with Client(mcp_server_url) as client: tools = await client.list_tools() # noqa: F841 - - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() # async def test_authorized_access(self, client_with_headless_oauth: Client): diff --git a/tests/server/auth/providers/test_workos.py b/tests/server/auth/providers/test_workos.py index f93fc9265..2cdc866a4 100644 --- a/tests/server/auth/providers/test_workos.py +++ b/tests/server/auth/providers/test_workos.py @@ -2,9 +2,9 @@ from urllib.parse import urlparse -import httpx import pytest from key_value.aio.stores.memory import MemoryStore +from mcp import MCPError from pytest_httpx import HTTPXMock from fastmcp import Client, FastMCP @@ -233,12 +233,11 @@ class TestAuthKitProvider: async def test_unauthorized_access( self, memory_storage: MemoryStore, mcp_server_url: str ): - with pytest.raises(httpx.HTTPStatusError) as exc_info: + # SDK v2 surfaces the server's 401 as a generic MCPError at the client + # boundary rather than re-raising httpx.HTTPStatusError. + with pytest.raises(MCPError): async with Client(mcp_server_url) as client: tools = await client.list_tools() # noqa: F841 - - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() # async def test_authorized_access(self, client_with_headless_oauth: Client): diff --git a/tests/server/auth/test_authorization.py b/tests/server/auth/test_authorization.py index 07ee5645a..5d18705b1 100644 --- a/tests/server/auth/test_authorization.py +++ b/tests/server/auth/test_authorization.py @@ -2,7 +2,6 @@ from unittest.mock import Mock -import mcp.types as mcp_types import pytest from mcp.server.auth.middleware.auth_context import auth_context_var from mcp.server.auth.middleware.bearer_auth import AuthenticatedUser @@ -378,10 +377,10 @@ class TestToolLevelAuth: class TestAuthMiddleware: - """Tests for middleware filtering via MCP handler layer. + """Tests for middleware filtering via the MCP handler layer. - These tests call _list_tools_mcp() which applies middleware during list, - simulating what happens when a client calls list_tools over MCP. + These tests drive an in-memory client so the middleware runs in the dispatch + chain, exactly as it does when a real client calls list_tools over MCP. """ async def test_middleware_filters_tools_without_token(self): @@ -392,8 +391,9 @@ class TestAuthMiddleware: return "public" # No token - all tools filtered by middleware - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) - assert len(result.tools) == 0 + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 0 async def test_middleware_allows_tools_with_token(self): mcp = FastMCP(middleware=[AuthMiddleware(auth=require_scopes("test"))]) @@ -405,8 +405,9 @@ class TestAuthMiddleware: token = make_token(scopes=["test"]) tok = set_token(token) try: - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) - assert len(result.tools) == 1 + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 1 finally: auth_context_var.reset(tok) @@ -421,8 +422,9 @@ class TestAuthMiddleware: token = make_token(scopes=["read"]) tok = set_token(token) try: - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) - assert len(result.tools) == 0 + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 0 finally: auth_context_var.reset(tok) @@ -430,8 +432,9 @@ class TestAuthMiddleware: token = make_token(scopes=["api"]) tok = set_token(token) try: - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) - assert len(result.tools) == 1 + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 1 finally: auth_context_var.reset(tok) @@ -449,16 +452,18 @@ class TestAuthMiddleware: return "admin" # No token - public tool allowed, admin tool blocked - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) - assert len(result.tools) == 1 - assert result.tools[0].name == "public_tool" + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 1 + assert tools[0].name == "public_tool" # Token with admin scope - both allowed token = make_token(scopes=["admin"]) tok = set_token(token) try: - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) - assert len(result.tools) == 2 + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 2 finally: auth_context_var.reset(tok) @@ -478,8 +483,9 @@ class TestAuthMiddleware: def allowed_tool() -> str: return "allowed" - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) - assert [tool.name for tool in result.tools] == ["allowed_tool"] + async with Client(mcp) as client: + tools = await client.list_tools() + assert [tool.name for tool in tools] == ["allowed_tool"] async def test_middleware_skips_resource_on_authorization_error(self): def deny_blocked_resource(ctx: AuthContext) -> bool: @@ -497,10 +503,9 @@ class TestAuthMiddleware: def allowed_resource() -> str: return "allowed" - result = await mcp._list_resources_mcp(mcp_types.ListResourcesRequest()) - assert [str(resource.uri) for resource in result.resources] == [ - "resource://allowed" - ] + async with Client(mcp) as client: + resources = await client.list_resources() + assert [str(resource.uri) for resource in resources] == ["resource://allowed"] async def test_middleware_skips_resource_template_on_authorization_error(self): def deny_blocked_resource_template(ctx: AuthContext) -> bool: @@ -518,10 +523,9 @@ class TestAuthMiddleware: def allowed_resource_template(item: str) -> str: return item - result = await mcp._list_resource_templates_mcp( - mcp_types.ListResourceTemplatesRequest() - ) - assert [template.uriTemplate for template in result.resourceTemplates] == [ + async with Client(mcp) as client: + templates = await client.list_resource_templates() + assert [template.uri_template for template in templates] == [ "resource://allowed/{item}" ] @@ -541,8 +545,9 @@ class TestAuthMiddleware: def allowed_prompt() -> str: return "allowed" - result = await mcp._list_prompts_mcp(mcp_types.ListPromptsRequest()) - assert [prompt.name for prompt in result.prompts] == ["allowed_prompt"] + async with Client(mcp) as client: + prompts = await client.list_prompts() + assert [prompt.name for prompt in prompts] == ["allowed_prompt"] # ============================================================================= @@ -663,17 +668,17 @@ class TestAsyncAuthIntegration: return "api" # Without token, tool is hidden - result = await mcp._list_tools_mcp(__import__("mcp").types.ListToolsRequest()) - assert len(result.tools) == 0 + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 0 # With token containing "api" scope, tool is visible token = make_token(scopes=["api"]) tok = set_token(token) try: - result = await mcp._list_tools_mcp( - __import__("mcp").types.ListToolsRequest() - ) - assert len(result.tools) == 1 + async with Client(mcp) as client: + tools = await client.list_tools() + assert len(tools) == 1 finally: auth_context_var.reset(tok) diff --git a/tests/server/auth/test_enhanced_error_responses.py b/tests/server/auth/test_enhanced_error_responses.py index eb77f66ce..4d7a2ac34 100644 --- a/tests/server/auth/test_enhanced_error_responses.py +++ b/tests/server/auth/test_enhanced_error_responses.py @@ -152,12 +152,12 @@ class TestEnhancedAuthorizationHandler: def test_html_error_includes_server_branding(self, oauth_proxy): """Test that HTML error page includes server branding from FastMCP instance.""" - from mcp.types import Icon + from mcp_types import Icon # Create FastMCP server with custom branding mcp = FastMCP( "My Custom Server", - icons=[Icon(src="https://example.com/icon.png", mimeType="image/png")], + icons=[Icon(src="https://example.com/icon.png", mime_type="image/png")], ) # Create app with OAuth routes diff --git a/tests/server/auth/test_jwt_provider_bearer.py b/tests/server/auth/test_jwt_provider_bearer.py index c88665c87..eb72227c6 100644 --- a/tests/server/auth/test_jwt_provider_bearer.py +++ b/tests/server/auth/test_jwt_provider_bearer.py @@ -1,8 +1,8 @@ from collections.abc import AsyncGenerator from typing import Any -import httpx import pytest +from mcp import MCPError from fastmcp import Client, FastMCP from fastmcp.client.auth.bearer import BearerAuth @@ -486,11 +486,11 @@ class TestFastMCPBearerAuth: assert isinstance(mcp.auth, JWTVerifier) async def test_unauthorized_access(self, mcp_server_url: str): - with pytest.raises(httpx.HTTPStatusError) as exc_info: + # SDK v2 masks the server's 401 behind a generic MCPError at the client + # boundary rather than re-raising httpx.HTTPStatusError. + with pytest.raises(MCPError): async with Client(mcp_server_url) as client: tools = await client.list_tools() # noqa: F841 - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() async def test_authorized_access(self, mcp_server_url: str, bearer_token): @@ -499,11 +499,9 @@ class TestFastMCPBearerAuth: assert tools async def test_invalid_token_raises_401(self, mcp_server_url: str): - with pytest.raises(httpx.HTTPStatusError) as exc_info: + with pytest.raises(MCPError): async with Client(mcp_server_url, auth=BearerAuth("invalid")) as client: tools = await client.list_tools() # noqa: F841 - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() async def test_expired_token(self, mcp_server_url: str, rsa_key_pair: RSAKeyPair): @@ -514,22 +512,18 @@ class TestFastMCPBearerAuth: expires_in_seconds=-3600, ) - with pytest.raises(httpx.HTTPStatusError) as exc_info: + with pytest.raises(MCPError): async with Client(mcp_server_url, auth=BearerAuth(token)) as client: tools = await client.list_tools() # noqa: F841 - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() async def test_token_with_bad_signature(self, mcp_server_url: str): rsa_key_pair = RSAKeyPair.generate() token = rsa_key_pair.create_token() - with pytest.raises(httpx.HTTPStatusError) as exc_info: + with pytest.raises(MCPError): async with Client(mcp_server_url, auth=BearerAuth(token)) as client: tools = await client.list_tools() # noqa: F841 - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() async def test_token_with_insufficient_scopes(self, rsa_key_pair: RSAKeyPair): @@ -546,14 +540,11 @@ class TestFastMCPBearerAuth: ) async with run_server_async(server, transport="http") as mcp_server_url: - with pytest.raises(httpx.HTTPStatusError) as exc_info: + # JWTVerifier rejects the token (verify_token returns None); SDK v2 + # surfaces the resulting 401 as a generic MCPError at the client. + with pytest.raises(MCPError): async with Client(mcp_server_url, auth=BearerAuth(token)) as client: tools = await client.list_tools() # noqa: F841 - # JWTVerifier returns 401 when verify_token returns None (invalid token) - # This is correct behavior - when TokenVerifier.verify_token returns None, - # it indicates the token is invalid (not just insufficient permissions) - assert isinstance(exc_info.value, httpx.HTTPStatusError) - assert exc_info.value.response.status_code == 401 assert "tools" not in locals() async def test_token_with_sufficient_scopes(self, rsa_key_pair: RSAKeyPair): diff --git a/tests/server/auth/test_oauth_consent_page.py b/tests/server/auth/test_oauth_consent_page.py index b408b7cb9..1cab95190 100644 --- a/tests/server/auth/test_oauth_consent_page.py +++ b/tests/server/auth/test_oauth_consent_page.py @@ -10,7 +10,7 @@ import pytest from key_value.aio.stores.memory import MemoryStore from mcp.server.auth.provider import AuthorizationParams from mcp.shared.auth import OAuthClientInformationFull -from mcp.types import Icon +from mcp_types import Icon from pydantic import AnyUrl from starlette.applications import Starlette from starlette.testclient import TestClient diff --git a/tests/server/auth/test_oauth_proxy_storage.py b/tests/server/auth/test_oauth_proxy_storage.py index 0273a368c..2cdac807d 100644 --- a/tests/server/auth/test_oauth_proxy_storage.py +++ b/tests/server/auth/test_oauth_proxy_storage.py @@ -201,6 +201,8 @@ class TestOAuthProxyStorage: "jwks": None, "software_id": None, "software_version": None, + "application_type": "native", + "issuer": None, "client_id": "structured-client", "client_secret": None, "client_id_issued_at": None, diff --git a/tests/server/http/test_http_dependencies.py b/tests/server/http/test_http_dependencies.py index f1a1e6f47..a2cd49774 100644 --- a/tests/server/http/test_http_dependencies.py +++ b/tests/server/http/test_http_dependencies.py @@ -1,7 +1,7 @@ import json import pytest -from mcp.types import TextContent, TextResourceContents +from mcp_types import TextContent, TextResourceContents from starlette.requests import Request from fastmcp.client import Client diff --git a/tests/server/http/test_stale_access_token.py b/tests/server/http/test_stale_access_token.py index 34f271e79..c2cf19180 100644 --- a/tests/server/http/test_stale_access_token.py +++ b/tests/server/http/test_stale_access_token.py @@ -11,12 +11,27 @@ from unittest.mock import MagicMock from mcp.server.auth.middleware.auth_context import auth_context_var from mcp.server.auth.middleware.bearer_auth import AuthenticatedUser -from mcp.server.lowlevel.server import request_ctx -from mcp.shared.context import RequestContext from starlette.requests import Request from fastmcp.server.auth import AccessToken -from fastmcp.server.dependencies import get_access_token +from fastmcp.server.dependencies import ( + FastMCPRequestContext, + fastmcp_request_ctx, + get_access_token, +) + + +def _make_ctx(request: Request | None) -> FastMCPRequestContext: + return FastMCPRequestContext( + session=MagicMock(), + request_id="0", + meta=None, + request=request, + protocol_version="2025-06-18", + close_sse_stream=None, + lifespan_context=MagicMock(), + _srctx=MagicMock(meta=None), + ) class TestStaleAccessToken: @@ -63,15 +78,11 @@ class TestStaleAccessToken: } mock_request = Request(scope) - # Create a mock RequestContext with the request - mock_request_context = MagicMock(spec=RequestContext) - mock_request_context.request = mock_request - # Set up the context vars: # - auth_context_var has STALE token - # - request_ctx has request with FRESH token + # - fastmcp_request_ctx has request with FRESH token auth_token = auth_context_var.set(stale_user) - request_token = request_ctx.set(mock_request_context) + request_token = fastmcp_request_ctx.set(_make_ctx(mock_request)) try: # Call get_access_token - should return FRESH token @@ -87,7 +98,7 @@ class TestStaleAccessToken: finally: # Clean up context vars auth_context_var.reset(auth_token) - request_ctx.reset(request_token) + fastmcp_request_ctx.reset(request_token) def test_get_access_token_falls_back_to_context_var_when_no_request(self): """ @@ -142,11 +153,9 @@ class TestStaleAccessToken: "user": UnauthenticatedUser(), } mock_request = Request(scope) - mock_request_context = MagicMock(spec=RequestContext) - mock_request_context.request = mock_request auth_token = auth_context_var.set(user) - request_token = request_ctx.set(mock_request_context) + request_token = fastmcp_request_ctx.set(_make_ctx(mock_request)) try: result = get_access_token() @@ -156,4 +165,4 @@ class TestStaleAccessToken: assert result.token == "context-var-token" finally: auth_context_var.reset(auth_token) - request_ctx.reset(request_token) + fastmcp_request_ctx.reset(request_token) diff --git a/tests/server/middleware/test_caching.py b/tests/server/middleware/test_caching.py index 056f9fc8e..8169dbd6f 100644 --- a/tests/server/middleware/test_caching.py +++ b/tests/server/middleware/test_caching.py @@ -6,7 +6,7 @@ import warnings from pathlib import Path from unittest.mock import AsyncMock, MagicMock -import mcp.types +import mcp_types import pytest from inline_snapshot import snapshot from key_value.aio.stores.filetree import ( @@ -21,7 +21,7 @@ from key_value.aio.wrappers.statistics.wrapper import ( PutStatistics, ) from mcp.server.lowlevel.helper_types import ReadResourceContents -from mcp.types import TextContent, TextResourceContents +from mcp_types import TextContent, TextResourceContents from pydantic import AnyUrl, BaseModel from fastmcp import Context, FastMCP @@ -64,7 +64,7 @@ SAMPLE_RESOURCE = Resource.from_function( ) SAMPLE_PROMPT = Prompt.from_function(fn=sample_prompt_fn, name="test_prompt") -SAMPLE_GET_PROMPT_RESULT = mcp.types.GetPromptResult( +SAMPLE_GET_PROMPT_RESULT = mcp_types.GetPromptResult( messages=[Message("test_text").to_mcp_prompt_message()] ) SAMPLE_TOOL = Tool(name="test_tool", parameters={"param1": "value1", "param2": 42}) @@ -146,9 +146,9 @@ class TrackingCalculator: return str(self.crazy_calls) async def update_tool_list(self, context: Context): - import mcp.types + import mcp_types - await context.send_notification(mcp.types.ToolListChangedNotification()) + await context.send_notification(mcp_types.ToolListChangedNotification()) def add_tools(self, fastmcp: FastMCP, prefix: str = ""): _ = fastmcp.add_tool(tool=Tool.from_function(fn=self.add, name=f"{prefix}add")) @@ -206,10 +206,10 @@ def tracking_calculator() -> TrackingCalculator: @pytest.fixture -def mock_context() -> MiddlewareContext[mcp.types.CallToolRequestParams]: +def mock_context() -> MiddlewareContext[mcp_types.CallToolRequestParams]: """Create a mock middleware context for tool calls.""" - context = MagicMock(spec=MiddlewareContext[mcp.types.CallToolRequestParams]) - context.message = mcp.types.CallToolRequestParams( + context = MagicMock(spec=MiddlewareContext[mcp_types.CallToolRequestParams]) + context.message = mcp_types.CallToolRequestParams( name="test_tool", arguments={"param1": "value1", "param2": 42} ) context.method = "tools/call" @@ -217,7 +217,7 @@ def mock_context() -> MiddlewareContext[mcp.types.CallToolRequestParams]: @pytest.fixture -def mock_call_next() -> CallNext[mcp.types.CallToolRequestParams, ToolResult]: +def mock_call_next() -> CallNext[mcp_types.CallToolRequestParams, ToolResult]: """Create a mock call_next function.""" return AsyncMock( return_value=ToolResult( @@ -339,7 +339,7 @@ class TestResponseCachingMiddlewareIntegration: """Test that tool list caching works with a real FastMCP server.""" async with Client(caching_server) as client: - pre_tool_list: list[mcp.types.Tool] = await client.list_tools() + pre_tool_list: list[mcp_types.Tool] = await client.list_tools() assert len(pre_tool_list) == 5 # Add a tool and make sure it's missing from the list tool response @@ -347,7 +347,7 @@ class TestResponseCachingMiddlewareIntegration: tool=Tool.from_function(fn=tracking_calculator.add, name="add_2") ) - post_tool_list: list[mcp.types.Tool] = await client.list_tools() + post_tool_list: list[mcp_types.Tool] = await client.list_tools() assert len(post_tool_list) == 5 assert pre_tool_list == post_tool_list @@ -417,13 +417,13 @@ class TestResponseCachingMiddlewareIntegration: ): """Test that list resources caching works with a real FastMCP server.""" async with Client[FastMCPTransport](transport=caching_server) as client: - pre_resource_list: list[mcp.types.Resource] = await client.list_resources() + pre_resource_list: list[mcp_types.Resource] = await client.list_resources() assert len(pre_resource_list) == 3 tracking_calculator.add_resources(fastmcp=caching_server) - post_resource_list: list[mcp.types.Resource] = await client.list_resources() + post_resource_list: list[mcp_types.Resource] = await client.list_resources() assert len(post_resource_list) == 3 assert pre_resource_list == post_resource_list @@ -449,13 +449,13 @@ class TestResponseCachingMiddlewareIntegration: ): """Test that list prompts caching works with a real FastMCP server.""" async with Client[FastMCPTransport](transport=caching_server) as client: - pre_prompt_list: list[mcp.types.Prompt] = await client.list_prompts() + pre_prompt_list: list[mcp_types.Prompt] = await client.list_prompts() assert len(pre_prompt_list) == 1 tracking_calculator.add_prompts(fastmcp=caching_server) - post_prompt_list: list[mcp.types.Prompt] = await client.list_prompts() + post_prompt_list: list[mcp_types.Prompt] = await client.list_prompts() assert len(post_prompt_list) == 1 @@ -503,7 +503,7 @@ class TestResponseCachingMiddlewareIntegration: assert statistics == snapshot( ResponseCachingStatistics( list_tools=KVStoreCollectionStatistics( - get=GetStatistics(count=2, hit=1, miss=1), + get=GetStatistics(count=1, hit=0, miss=1), put=PutStatistics(count=1), ), call_tool=KVStoreCollectionStatistics( @@ -518,7 +518,7 @@ class TestResponseCachingMiddlewareIntegration: assert statistics == snapshot( ResponseCachingStatistics( list_tools=KVStoreCollectionStatistics( - get=GetStatistics(count=2, hit=1, miss=1), + get=GetStatistics(count=1, hit=0, miss=1), put=PutStatistics(count=1), ), call_tool=KVStoreCollectionStatistics( @@ -646,7 +646,7 @@ class TestCachingWithImportedServerPrefixes: class TestCacheKeyGeneration: def test_call_tool_key_is_hashed_and_does_not_include_raw_input(self): - msg = mcp.types.CallToolRequestParams( + msg = mcp_types.CallToolRequestParams( name="toolX", arguments={"password": "secret", "path": "../../etc/passwd"}, ) @@ -658,8 +658,8 @@ class TestCacheKeyGeneration: assert "../../etc/passwd" not in key def test_read_resource_key_is_hashed_and_does_not_include_raw_uri(self): - msg = mcp.types.ReadResourceRequestParams( - uri=AnyUrl("file:///tmp/../../etc/shadow?token=abcd") + msg = mcp_types.ReadResourceRequestParams( + uri="file:///tmp/../../etc/shadow?token=abcd" ) key = _make_read_resource_cache_key(msg) @@ -669,7 +669,7 @@ class TestCacheKeyGeneration: assert "token=abcd" not in key def test_get_prompt_key_is_hashed_and_stable(self): - msg = mcp.types.GetPromptRequestParams( + msg = mcp_types.GetPromptRequestParams( name="promptY", arguments={"api_key": "ABC123", "scope": "admin"}, ) @@ -681,7 +681,7 @@ class TestCacheKeyGeneration: assert key == _make_get_prompt_cache_key(msg) def test_call_tool_key_partitions_by_auth(self): - msg = mcp.types.CallToolRequestParams(name="t", arguments={"a": 1}) + msg = mcp_types.CallToolRequestParams(name="t", arguments={"a": 1}) anon = _make_call_tool_cache_key(msg) user_a = _make_call_tool_cache_key(msg, auth_key="user_a") @@ -692,7 +692,7 @@ class TestCacheKeyGeneration: assert user_a != anon def test_read_resource_key_partitions_by_auth(self): - msg = mcp.types.ReadResourceRequestParams(uri=AnyUrl("file:///tmp/x")) + msg = mcp_types.ReadResourceRequestParams(uri="file:///tmp/x") user_a = _make_read_resource_cache_key(msg, auth_key="user_a") user_b = _make_read_resource_cache_key(msg, auth_key="user_b") @@ -700,7 +700,7 @@ class TestCacheKeyGeneration: assert user_a != user_b def test_get_prompt_key_partitions_by_auth(self): - msg = mcp.types.GetPromptRequestParams(name="p", arguments={"a": "1"}) + msg = mcp_types.GetPromptRequestParams(name="p", arguments={"a": "1"}) user_a = _make_get_prompt_cache_key(msg, auth_key="user_a") user_b = _make_get_prompt_cache_key(msg, auth_key="user_b") diff --git a/tests/server/middleware/test_dereference.py b/tests/server/middleware/test_dereference.py index 0ababd7de..ce4b369c9 100644 --- a/tests/server/middleware/test_dereference.py +++ b/tests/server/middleware/test_dereference.py @@ -32,7 +32,7 @@ class TestDereferenceRefsMiddleware: async with Client(mcp) as client: tools = await client.list_tools() - schema = tools[0].inputSchema + schema = tools[0].input_schema # $defs should be removed — everything inlined assert "$defs" not in schema # The Color enum should be inlined into the request property @@ -49,7 +49,7 @@ class TestDereferenceRefsMiddleware: async with Client(mcp) as client: tools = await client.list_tools() - schema = tools[0].inputSchema + schema = tools[0].input_schema # $defs should still be present assert "$defs" in schema @@ -64,7 +64,7 @@ class TestDereferenceRefsMiddleware: async with Client(mcp) as client: tools = await client.list_tools() - schema = tools[0].inputSchema + schema = tools[0].input_schema assert "$defs" not in schema async def test_does_not_mutate_original_tool(self): @@ -100,9 +100,9 @@ class TestDereferenceRefsMiddleware: tool = tools[0] # Both input and output schemas should be dereferenced - assert "$defs" not in tool.inputSchema - if tool.outputSchema is not None: - assert "$defs" not in tool.outputSchema + assert "$defs" not in tool.input_schema + if tool.output_schema is not None: + assert "$defs" not in tool.output_schema async def test_resource_templates_dereferenced(self): """Middleware dereferences resource template schemas.""" @@ -130,7 +130,7 @@ class TestDereferenceRefsMiddleware: async with Client(mcp) as client: tools = await client.list_tools() - schema = tools[0].inputSchema + schema = tools[0].input_schema # Simple schema should not have $defs regardless assert "$defs" not in schema assert schema["properties"]["a"]["type"] == "integer" diff --git a/tests/server/middleware/test_error_handling.py b/tests/server/middleware/test_error_handling.py index dfc551fbf..773bb7d0b 100644 --- a/tests/server/middleware/test_error_handling.py +++ b/tests/server/middleware/test_error_handling.py @@ -4,7 +4,7 @@ import logging from unittest.mock import AsyncMock, MagicMock import pytest -from mcp import McpError +from mcp import MCPError from fastmcp import FastMCP from fastmcp.client import Client @@ -106,9 +106,8 @@ class TestErrorHandlingMiddleware: def test_transform_error_mcp_error(self, mock_context): """Test that MCP errors are not transformed.""" middleware = ErrorHandlingMiddleware() - from mcp.types import ErrorData - error = McpError(ErrorData(code=-32001, message="test error")) + error = MCPError(code=-32001, message="test error") result = middleware._transform_error(error, mock_context) @@ -130,7 +129,7 @@ class TestErrorHandlingMiddleware: result = middleware._transform_error(error, mock_context) - assert isinstance(result, McpError) + assert isinstance(result, MCPError) assert result.error.code == -32602 assert "Invalid params: test error" in result.error.message @@ -146,7 +145,7 @@ class TestErrorHandlingMiddleware: ]: result = middleware._transform_error(error, resource_context) - assert isinstance(result, McpError) + assert isinstance(result, MCPError) assert result.error.code == -32002 assert "Resource not found: test error" in result.error.message @@ -160,7 +159,7 @@ class TestErrorHandlingMiddleware: ]: result = middleware._transform_error(error, mock_context) - assert isinstance(result, McpError) + assert isinstance(result, MCPError) assert result.error.code == -32001 assert "Not found: test error" in result.error.message @@ -171,7 +170,7 @@ class TestErrorHandlingMiddleware: result = middleware._transform_error(error, mock_context) - assert isinstance(result, McpError) + assert isinstance(result, MCPError) assert result.error.code == -32000 assert "Permission denied: test error" in result.error.message @@ -182,7 +181,7 @@ class TestErrorHandlingMiddleware: result = middleware._transform_error(error, mock_context) - assert isinstance(result, McpError) + assert isinstance(result, MCPError) assert result.error.code == -32000 assert "Request timeout: test error" in result.error.message @@ -193,7 +192,7 @@ class TestErrorHandlingMiddleware: result = middleware._transform_error(error, mock_context) - assert isinstance(result, McpError) + assert isinstance(result, MCPError) assert result.error.code == -32603 assert "Internal error: test error" in result.error.message @@ -212,10 +211,10 @@ class TestErrorHandlingMiddleware: mock_call_next = AsyncMock(side_effect=ValueError("test error")) with caplog.at_level(logging.ERROR): - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await middleware.on_message(mock_context, mock_call_next) - assert isinstance(exc_info.value, McpError) + assert isinstance(exc_info.value, MCPError) assert exc_info.value.error.code == -32602 assert "Invalid params: test error" in exc_info.value.error.message assert "Error in test_method: ValueError: test error" in caplog.text @@ -228,10 +227,10 @@ class TestErrorHandlingMiddleware: mock_call_next = AsyncMock(side_effect=tool_error) with caplog.at_level(logging.ERROR): - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await middleware.on_message(mock_context, mock_call_next) - assert isinstance(exc_info.value, McpError) + assert isinstance(exc_info.value, MCPError) assert exc_info.value.error.code == -32602 assert "Invalid params: test error" in exc_info.value.error.message assert "Error in test_method: ToolError: test error" in caplog.text diff --git a/tests/server/middleware/test_initialization_middleware.py b/tests/server/middleware/test_initialization_middleware.py index 1552edcf6..3a077b367 100644 --- a/tests/server/middleware/test_initialization_middleware.py +++ b/tests/server/middleware/test_initialization_middleware.py @@ -3,10 +3,10 @@ from collections.abc import Sequence from typing import Any -import mcp.types as mt +import mcp_types as mt import pytest -from mcp import McpError -from mcp.types import ErrorData, TextContent +from mcp import MCPError +from mcp_types import TextContent from fastmcp import Client, FastMCP from fastmcp.server.middleware import CallNext, Middleware, MiddlewareContext @@ -39,7 +39,7 @@ class InitializationMiddleware(Middleware): if hasattr(context.message, "params") and hasattr( context.message.params, "clientInfo" ): - self.client_info = context.message.params.clientInfo + self.client_info = context.message.params.client_info # Store in instance for cross-request access # (session state is not available during on_initialize) @@ -96,7 +96,7 @@ class ClientDetectionMiddleware(Middleware): if tool.annotations is None: tool.annotations = mt.ToolAnnotations() # Mark as read-only for test clients - tool.annotations.readOnlyHint = True + tool.annotations.read_only_hint = True self.tools_modified = True return tools @@ -173,7 +173,7 @@ async def test_client_detection_middleware(): # Check that the tool has the modified annotation tool = tools[0] assert tool.annotations is not None - assert tool.annotations.readOnlyHint is True + assert tool.annotations.read_only_hint is True async def test_multiple_middleware_initialization(): @@ -293,13 +293,13 @@ async def test_middleware_can_access_initialize_result(): assert isinstance(middleware.initialize_result, mt.InitializeResult) # Verify the result contains expected server info - assert middleware.initialize_result.serverInfo.name == "TestServer" - assert middleware.initialize_result.protocolVersion is not None + assert middleware.initialize_result.server_info.name == "TestServer" + assert middleware.initialize_result.protocol_version is not None assert middleware.initialize_result.capabilities is not None async def test_middleware_mcp_error_during_initialization(): - """Test that McpError raised in middleware during initialization is sent to client.""" + """Test that MCPError raised in middleware during initialization is sent to client.""" server = FastMCP("TestServer") class ErrorThrowingMiddleware(Middleware): @@ -308,15 +308,13 @@ async def test_middleware_mcp_error_during_initialization(): context: MiddlewareContext[mt.InitializeRequest], call_next: CallNext[mt.InitializeRequest, mt.InitializeResult | None], ) -> mt.InitializeResult | None: - raise McpError( - ErrorData( - code=mt.INVALID_PARAMS, message="Invalid initialization parameters" - ) + raise MCPError( + code=mt.INVALID_PARAMS, message="Invalid initialization parameters" ) server.add_middleware(ErrorThrowingMiddleware()) - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: async with Client(server): pass @@ -325,7 +323,7 @@ async def test_middleware_mcp_error_during_initialization(): async def test_middleware_mcp_error_before_call_next(): - """Test McpError raised before calling next middleware.""" + """Test MCPError raised before calling next middleware.""" server = FastMCP("TestServer") class EarlyErrorMiddleware(Middleware): @@ -334,13 +332,11 @@ async def test_middleware_mcp_error_before_call_next(): context: MiddlewareContext[mt.InitializeRequest], call_next: CallNext[mt.InitializeRequest, mt.InitializeResult | None], ) -> mt.InitializeResult | None: - raise McpError( - ErrorData(code=mt.INVALID_REQUEST, message="Request validation failed") - ) + raise MCPError(code=mt.INVALID_REQUEST, message="Request validation failed") server.add_middleware(EarlyErrorMiddleware()) - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: async with Client(server): pass @@ -349,7 +345,7 @@ async def test_middleware_mcp_error_before_call_next(): async def test_middleware_mcp_error_after_call_next(): - """Test that McpError raised after call_next doesn't break the connection. + """Test that MCPError raised after call_next doesn't break the connection. When an error is raised after call_next, the responder has already completed, so the error is caught but not sent to the responder (checked via _completed flag). @@ -368,9 +364,7 @@ async def test_middleware_mcp_error_after_call_next(): ) -> mt.InitializeResult | None: await call_next(context) self.error_raised = True - raise McpError( - ErrorData(code=mt.INTERNAL_ERROR, message="Post-processing failed") - ) + raise MCPError(code=mt.INTERNAL_ERROR, message="Post-processing failed") middleware = PostProcessingErrorMiddleware() server.add_middleware(middleware) diff --git a/tests/server/middleware/test_logging.py b/tests/server/middleware/test_logging.py index 94c1d565b..cb191dd16 100644 --- a/tests/server/middleware/test_logging.py +++ b/tests/server/middleware/test_logging.py @@ -6,11 +6,9 @@ from collections.abc import Generator from typing import Any, Literal, TypeVar from unittest.mock import AsyncMock, MagicMock, patch -import mcp -import mcp.types +import mcp_types import pytest from inline_snapshot import snapshot -from pydantic import AnyUrl from fastmcp import FastMCP from fastmcp.client import Client @@ -69,9 +67,9 @@ def mock_context(): """Create a mock middleware context.""" return new_mock_context( - message=mcp.types.CallToolRequest( + message=mcp_types.CallToolRequest( method="tools/call", - params=mcp.types.CallToolRequestParams( + params=mcp_types.CallToolRequestParams( name="test_method", arguments={"param": "value"}, ), @@ -143,7 +141,7 @@ class TestStructuredLoggingMiddleware: "event": "request_start", "source": "client", "method": "test_method", - "payload": '{"method":"tools/call","params":{"task":null,"_meta":null,"name":"test_method","arguments":{"param":"value"}}}', + "payload": '{"method":"tools/call","params":{"_meta":null,"inputResponses":null,"requestState":null,"name":"test_method","arguments":{"param":"value"},"task":null}}', "payload_type": "CallToolRequest", } ) @@ -158,7 +156,7 @@ class TestStructuredLoggingMiddleware: "event": "request_start", "source": "client", "method": "test_method", - "payload_length": 110, + "payload_length": 152, } ) @@ -176,8 +174,8 @@ class TestStructuredLoggingMiddleware: "event": "request_start", "source": "client", "method": "test_method", - "payload_tokens": 27, - "payload_length": 110, + "payload_tokens": 38, + "payload_length": 152, } ) @@ -282,10 +280,10 @@ class TestLoggingMiddleware: """Ensure Pydantic AnyUrl in payload serializes correctly when include_payloads=True.""" mock_context = new_mock_context( - message=mcp.types.ReadResourceRequest( + message=mcp_types.ReadResourceRequest( method="resources/read", - params=mcp.types.ReadResourceRequestParams( - uri=AnyUrl("test://example/1"), + params=mcp_types.ReadResourceRequestParams( + uri="test://example/1", ), ) ) @@ -298,7 +296,7 @@ class TestLoggingMiddleware: assert get_log_lines(caplog) == snapshot( [ - '{"event": "request_start", "method": "test_method", "source": "client", "payload": "{\\"method\\":\\"resources/read\\",\\"params\\":{\\"task\\":null,\\"_meta\\":null,\\"uri\\":\\"test://example/1\\"}}", "payload_type": "ReadResourceRequest"}', + '{"event": "request_start", "method": "test_method", "source": "client", "payload": "{\\"method\\":\\"resources/read\\",\\"params\\":{\\"_meta\\":null,\\"inputResponses\\":null,\\"requestState\\":null,\\"uri\\":\\"test://example/1\\"}}", "payload_type": "ReadResourceRequest"}', '{"event": "request_success", "method": "test_method", "source": "client", "duration_ms": 0.02}', ] ) @@ -341,9 +339,9 @@ class TestLoggingMiddleware: return "NON_SERIALIZABLE" mock_context = new_mock_context( - message=mcp.types.CallToolRequest( + message=mcp_types.CallToolRequest( method="tools/call", - params=mcp.types.CallToolRequestParams( + params=mcp_types.CallToolRequestParams( name="test_method", arguments={"obj": NonSerializable()}, ), @@ -358,7 +356,7 @@ class TestLoggingMiddleware: assert get_log_lines(caplog) == snapshot( [ - '{"event": "request_start", "method": "test_method", "source": "client", "payload": "{\\"method\\":\\"tools/call\\",\\"params\\":{\\"task\\":null,\\"_meta\\":null,\\"name\\":\\"test_method\\",\\"arguments\\":{\\"obj\\":\\"NON_SERIALIZABLE\\"}}}", "payload_type": "CallToolRequest"}', + '{"event": "request_start", "method": "test_method", "source": "client", "payload": "{\\"method\\":\\"tools/call\\",\\"params\\":{\\"_meta\\":null,\\"inputResponses\\":null,\\"requestState\\":null,\\"name\\":\\"test_method\\",\\"arguments\\":{\\"obj\\":\\"NON_SERIALIZABLE\\"},\\"task\\":null}}", "payload_type": "CallToolRequest"}', '{"event": "request_success", "method": "test_method", "source": "client", "duration_ms": 0.02}', ] ) @@ -373,9 +371,9 @@ class TestLoggingMiddleware: return "CUSTOM_PAYLOAD" mock_context = new_mock_context( - message=mcp.types.CallToolRequest( + message=mcp_types.CallToolRequest( method="tools/call", - params=mcp.types.CallToolRequestParams( + params=mcp_types.CallToolRequestParams( name="test_method", arguments={"obj": "OBJECT"}, ), @@ -533,7 +531,7 @@ class TestLoggingMiddlewareIntegration: assert get_log_lines(caplog) == snapshot( [ - 'event=request_start method=tools/call source=client payload={"task":null,"_meta":null,"name":"simple_operation","arguments":{"data":"payload_test"}} payload_type=CallToolRequestParams', + 'event=request_start method=tools/call source=client payload={"_meta":null,"inputResponses":null,"requestState":null,"name":"simple_operation","arguments":{"data":"payload_test"},"task":null} payload_type=CallToolRequestParams', "event=request_success method=tools/call source=client duration_ms=0.02", ] ) @@ -556,7 +554,7 @@ class TestLoggingMiddlewareIntegration: assert get_log_lines(caplog) == snapshot( [ - '{"event": "request_start", "method": "tools/call", "source": "client", "payload": "{\\"task\\":null,\\"_meta\\":null,\\"name\\":\\"simple_operation\\",\\"arguments\\":{\\"data\\":\\"json_test\\"}}", "payload_type": "CallToolRequestParams"}', + '{"event": "request_start", "method": "tools/call", "source": "client", "payload": "{\\"_meta\\":null,\\"inputResponses\\":null,\\"requestState\\":null,\\"name\\":\\"simple_operation\\",\\"arguments\\":{\\"data\\":\\"json_test\\"},\\"task\\":null}", "payload_type": "CallToolRequestParams"}', '{"event": "request_success", "method": "tools/call", "source": "client", "duration_ms": 0.02}', ] ) @@ -649,6 +647,6 @@ class TestLoggingMiddlewareIntegration: # Check that our custom logger captured the logs log_output = log_buffer.getvalue() assert log_output == snapshot("""\ -event=request_start method=tools/call source=client payload={"task":null,"_meta":null,"name":"simple_operation","arguments":{"data":"custom_test"}} payload_type=CallToolRequestParams +event=request_start method=tools/call source=client payload={"_meta":null,"inputResponses":null,"requestState":null,"name":"simple_operation","arguments":{"data":"custom_test"},"task":null} payload_type=CallToolRequestParams event=request_success method=tools/call source=client duration_ms=0.02 """) diff --git a/tests/server/middleware/test_middleware.py b/tests/server/middleware/test_middleware.py index 7f3ff9faa..f58736437 100644 --- a/tests/server/middleware/test_middleware.py +++ b/tests/server/middleware/test_middleware.py @@ -2,8 +2,9 @@ from collections.abc import Callable from dataclasses import dataclass from typing import Any -import mcp.types +import mcp_types import pytest +from mcp.server.context import ServerRequestContext from fastmcp import Client, FastMCP from fastmcp.server.context import Context @@ -16,7 +17,7 @@ class Recording: # the hook is the name of the hook that was called, e.g. "on_list_tools" hook: str context: MiddlewareContext - result: mcp.types.ServerResult | None + result: mcp_types.ServerResult | None class RecordingMiddleware(Middleware): @@ -152,15 +153,18 @@ def mcp_server(recording_middleware): mcp.add_middleware(recording_middleware) - # Register progress handler - @mcp._mcp_server.progress_notification() + # Register a progress notification handler (v2 API: (ctx, params)). async def handle_progress( - progress_token: str | int, - progress: float, - total: float | None, - message: str | None, - ): - print("HI") + _ctx: ServerRequestContext, + _params: mcp_types.ProgressNotificationParams, + ) -> None: + pass + + mcp._mcp_server.add_notification_handler( + "notifications/progress", + mcp_types.ProgressNotificationParams, + handle_progress, + ) return mcp @@ -391,7 +395,7 @@ class TestMiddlewareHooks: templates = await client.list_resource_templates() assert len(templates) == 1 - assert str(templates[0].uriTemplate) == "resource://public/{x}" + assert str(templates[0].uri_template) == "resource://public/{x}" async def test_list_prompts_filtering_middleware(self): """Test that middleware can filter prompts.""" @@ -433,8 +437,8 @@ class TestMiddlewareHooks: class CallToolMiddleware(Middleware): async def on_call_tool( self, - context: MiddlewareContext[mcp.types.CallToolRequestParams], - call_next: CallNext[mcp.types.CallToolRequestParams, ToolResult], + context: MiddlewareContext[mcp_types.CallToolRequestParams], + call_next: CallNext[mcp_types.CallToolRequestParams, ToolResult], ): # modify argument if context.message.name == "add": @@ -566,7 +570,7 @@ class TestApplyMiddlewareParameter: assert len(result.messages) == 1 # content is TextContent | EmbeddedResource, but we know it's TextContent from the test - assert isinstance(result.messages[0].content, mcp.types.TextContent) + assert isinstance(result.messages[0].content, mcp_types.TextContent) assert result.messages[0].content.text == "Hello, World!" assert recording.assert_called(hook="on_get_prompt", times=1) @@ -587,7 +591,7 @@ class TestApplyMiddlewareParameter: assert len(result.messages) == 1 # content is TextContent | EmbeddedResource, but we know it's TextContent from the test - assert isinstance(result.messages[0].content, mcp.types.TextContent) + assert isinstance(result.messages[0].content, mcp_types.TextContent) assert result.messages[0].content.text == "Hello, World!" # Middleware should not have been called assert len(recording.calls) == 0 diff --git a/tests/server/middleware/test_middleware_nested.py b/tests/server/middleware/test_middleware_nested.py index ca73e62a3..2f6d2593e 100644 --- a/tests/server/middleware/test_middleware_nested.py +++ b/tests/server/middleware/test_middleware_nested.py @@ -2,8 +2,9 @@ from collections.abc import Callable from dataclasses import dataclass from typing import Any -import mcp.types +import mcp_types import pytest +from mcp.server.context import ServerRequestContext from fastmcp import Client, FastMCP from fastmcp.exceptions import ToolError @@ -17,7 +18,7 @@ class Recording: # the hook is the name of the hook that was called, e.g. "on_list_tools" hook: str context: MiddlewareContext - result: mcp.types.ServerResult | None + result: mcp_types.ServerResult | None class RecordingMiddleware(Middleware): @@ -153,15 +154,18 @@ def mcp_server(recording_middleware): mcp.add_middleware(recording_middleware) - # Register progress handler - @mcp._mcp_server.progress_notification() + # Register a progress notification handler (v2 API: (ctx, params)). async def handle_progress( - progress_token: str | int, - progress: float, - total: float | None, - message: str | None, - ): - print("HI") + _ctx: ServerRequestContext, + _params: mcp_types.ProgressNotificationParams, + ) -> None: + pass + + mcp._mcp_server.add_notification_handler( + "notifications/progress", + mcp_types.ProgressNotificationParams, + handle_progress, + ) return mcp @@ -517,8 +521,8 @@ class TestToolCallDenial: class AuthMiddleware(Middleware): async def on_call_tool( self, - context: MiddlewareContext[mcp.types.CallToolRequestParams], - call_next: CallNext[mcp.types.CallToolRequestParams, ToolResult], + context: MiddlewareContext[mcp_types.CallToolRequestParams], + call_next: CallNext[mcp_types.CallToolRequestParams, ToolResult], ) -> ToolResult: tool_name = context.message.name if tool_name.lower() == "restricted_tool": @@ -560,8 +564,8 @@ class TestToolCallDenial: class SelectiveAuthMiddleware(Middleware): async def on_call_tool( self, - context: MiddlewareContext[mcp.types.CallToolRequestParams], - call_next: CallNext[mcp.types.CallToolRequestParams, ToolResult], + context: MiddlewareContext[mcp_types.CallToolRequestParams], + call_next: CallNext[mcp_types.CallToolRequestParams, ToolResult], ) -> ToolResult: tool_name = context.message.name diff --git a/tests/server/middleware/test_ping.py b/tests/server/middleware/test_ping.py index 0d2677102..b35616fc1 100644 --- a/tests/server/middleware/test_ping.py +++ b/tests/server/middleware/test_ping.py @@ -38,14 +38,26 @@ class TestPingMiddlewareInit: class TestPingMiddlewareOnMessage: """Test on_message hook behavior.""" + def _mock_session(self): + """Build a mock session with a stable per-connection Connection. + + SDK v2 constructs a ServerSession per request; PingMiddleware keys the + keepalive loop off the underlying Connection (and registers cleanup on + its exit stack), so tests supply a connection with an exit_stack. + """ + connection = MagicMock() + connection.exit_stack = MagicMock() + connection.exit_stack.push_async_callback = MagicMock() + session = MagicMock() + session._connection = connection + session.send_ping = AsyncMock() + return session, connection + async def test_starts_ping_task_on_first_message(self): - """Test that ping task is started on first message from a session.""" + """Test that a ping task is started on first message from a connection.""" middleware = PingMiddleware(interval_ms=1000) - mock_session = MagicMock() - mock_session._subscription_task_group = MagicMock() - mock_session._subscription_task_group.start_soon = MagicMock() - + mock_session, connection = self._mock_session() mock_context = MagicMock() mock_context.fastmcp_context.session = mock_session @@ -54,43 +66,34 @@ class TestPingMiddlewareOnMessage: result = await middleware.on_message(mock_context, mock_call_next) assert result == "result" - assert id(mock_session) in middleware._active_sessions - mock_session._subscription_task_group.start_soon.assert_called_once() + assert id(connection) in middleware._active_sessions + connection.exit_stack.push_async_callback.assert_called_once() async def test_does_not_start_duplicate_task(self): - """Test that duplicate messages from same session don't spawn duplicate tasks.""" + """Test that duplicate messages from same connection don't spawn duplicates.""" middleware = PingMiddleware(interval_ms=1000) - mock_session = MagicMock() - mock_session._subscription_task_group = MagicMock() - mock_session._subscription_task_group.start_soon = MagicMock() - + mock_session, connection = self._mock_session() mock_context = MagicMock() mock_context.fastmcp_context.session = mock_session mock_call_next = AsyncMock(return_value="result") - # First message + # Three messages from the same connection await middleware.on_message(mock_context, mock_call_next) - # Second message from same session await middleware.on_message(mock_context, mock_call_next) - # Third message from same session await middleware.on_message(mock_context, mock_call_next) - # Should only start task once - assert mock_session._subscription_task_group.start_soon.call_count == 1 + # Cleanup registered only once + assert connection.exit_stack.push_async_callback.call_count == 1 + assert len(middleware._active_sessions) == 1 async def test_starts_separate_task_per_session(self): - """Test that different sessions get separate ping tasks.""" + """Test that different connections get separate ping tasks.""" middleware = PingMiddleware(interval_ms=1000) - mock_session1 = MagicMock() - mock_session1._subscription_task_group = MagicMock() - mock_session1._subscription_task_group.start_soon = MagicMock() - - mock_session2 = MagicMock() - mock_session2._subscription_task_group = MagicMock() - mock_session2._subscription_task_group.start_soon = MagicMock() + mock_session1, connection1 = self._mock_session() + mock_session2, connection2 = self._mock_session() mock_context1 = MagicMock() mock_context1.fastmcp_context.session = mock_session1 @@ -103,28 +106,10 @@ class TestPingMiddlewareOnMessage: await middleware.on_message(mock_context1, mock_call_next) await middleware.on_message(mock_context2, mock_call_next) - mock_session1._subscription_task_group.start_soon.assert_called_once() - mock_session2._subscription_task_group.start_soon.assert_called_once() + connection1.exit_stack.push_async_callback.assert_called_once() + connection2.exit_stack.push_async_callback.assert_called_once() assert len(middleware._active_sessions) == 2 - async def test_skips_task_when_no_task_group(self): - """Test graceful handling when session has no task group.""" - middleware = PingMiddleware(interval_ms=1000) - - mock_session = MagicMock() - mock_session._subscription_task_group = None - - mock_context = MagicMock() - mock_context.fastmcp_context.session = mock_session - - mock_call_next = AsyncMock(return_value="result") - - result = await middleware.on_message(mock_context, mock_call_next) - - assert result == "result" - # Session should NOT be added if task group is None - assert id(mock_session) not in middleware._active_sessions - async def test_skips_when_fastmcp_context_is_none(self): """Test that middleware passes through when fastmcp_context is None.""" middleware = PingMiddleware(interval_ms=1000) diff --git a/tests/server/middleware/test_rate_limiting.py b/tests/server/middleware/test_rate_limiting.py index d2d81ef98..4ae5ae114 100644 --- a/tests/server/middleware/test_rate_limiting.py +++ b/tests/server/middleware/test_rate_limiting.py @@ -4,10 +4,10 @@ import asyncio from unittest.mock import AsyncMock, MagicMock import pytest +from mcp import MCPError from fastmcp import FastMCP from fastmcp.client import Client -from fastmcp.exceptions import ToolError from fastmcp.server.middleware.middleware import MiddlewareContext from fastmcp.server.middleware.rate_limiting import ( RateLimitError, @@ -394,7 +394,7 @@ class TestRateLimitingMiddlewareIntegration: for i in range(30): try: await client.call_tool("quick_action", {"message": str(i)}) - except ToolError as exc: + except MCPError as exc: assert "Rate limit exceeded" in str(exc) hit_limit = True break @@ -433,37 +433,53 @@ class TestRateLimitingMiddlewareIntegration: async def test_sliding_window_rate_limiting(self, rate_limit_server): """Test sliding window rate limiting implementation.""" + # A tight window; the SDK's internal init/list_tools requests count + # against it too, so fire tool calls until the limit is hit rather than + # hard-coding the exact request count (which differs across SDK versions). rate_limit_server.add_middleware( SlidingWindowRateLimitingMiddleware( - max_requests=6, # 1 init + 1 list_tools + 3 calls + 1 to fail - window_minutes=1, # 1-minute window + max_requests=6, + window_minutes=1, ) ) async with Client(rate_limit_server) as client: - # Should allow up to the limit - await client.call_tool("quick_action", {"message": "1"}) - await client.call_tool("quick_action", {"message": "2"}) - await client.call_tool("quick_action", {"message": "3"}) - - # Fourth should be blocked - with pytest.raises(ToolError, match="Rate limit exceeded"): - await client.call_tool("quick_action", {"message": "4"}) + hit_limit = False + for i in range(10): + try: + await client.call_tool("quick_action", {"message": str(i)}) + except MCPError as exc: + assert "Rate limit exceeded" in str(exc) + hit_limit = True + break + assert hit_limit, "Rate limit was never triggered" async def test_rate_limiting_with_different_operations(self, rate_limit_server): """Test that rate limiting applies to all types of operations.""" rate_limit_server.add_middleware( - RateLimitingMiddleware(max_requests_per_second=9.0, burst_capacity=5) + RateLimitingMiddleware(max_requests_per_second=0.001, burst_capacity=5) ) async with Client(rate_limit_server) as client: - # Mix different operations - await client.call_tool("quick_action", {"message": "test"}) - await client.call_tool("heavy_computation") - - # Should be rate limited regardless of operation type - with pytest.raises(ToolError, match="Rate limit exceeded"): - await client.call_tool("batch_process", {"items": ["a", "b", "c"]}) + # Mix different operations; with near-zero refill the shared bucket + # is exhausted regardless of which operation trips it. + operations = [ + ("quick_action", {"message": "test"}), + ("heavy_computation", {}), + ("batch_process", {"items": ["a", "b", "c"]}), + ("quick_action", {"message": "again"}), + ("heavy_computation", {}), + ("batch_process", {"items": ["x"]}), + ] + hit_limit = False + for name, args in operations: + try: + await client.call_tool(name, args) + except MCPError as exc: + assert "Rate limit exceeded" in str(exc) + hit_limit = True + break + assert hit_limit, "Rate limit was never triggered" async def test_custom_client_identification(self, rate_limit_server): """Test rate limiting with custom client identification.""" @@ -474,22 +490,24 @@ class TestRateLimitingMiddlewareIntegration: rate_limit_server.add_middleware( RateLimitingMiddleware( - max_requests_per_second=1.0, # Very slow refill to ensure rate limiting triggers - burst_capacity=4, # init + list_tools + call + list_tools = 4, so 2nd call fails + max_requests_per_second=0.001, # near-zero refill so tokens never replenish + burst_capacity=4, get_client_id=get_client_id, ) ) async with Client(rate_limit_server) as client: - # First request should succeed - await client.call_tool("quick_action", {"message": "first"}) - - # Second should be rate limited for this specific client - with pytest.raises(ToolError) as exc_info: - await client.call_tool("quick_action", {"message": "second"}) - assert "Rate limit exceeded for client: test_client_123" in str( - exc_info.value - ) + # Fire calls until the per-client bucket is exhausted; the exact + # burst count depends on the SDK's internal request volume. + exc_message = None + for i in range(10): + try: + await client.call_tool("quick_action", {"message": str(i)}) + except MCPError as exc: + exc_message = str(exc) + break + assert exc_message is not None, "Rate limit was never triggered" + assert "Rate limit exceeded for client: test_client_123" in exc_message async def test_global_rate_limiting(self, rate_limit_server): """Test global rate limiting across all clients.""" @@ -505,7 +523,7 @@ class TestRateLimitingMiddlewareIntegration: middleware.global_limiter.tokens = 0 - with pytest.raises(ToolError, match="Global rate limit exceeded"): + with pytest.raises(MCPError, match="Global rate limit exceeded"): await client.call_tool("quick_action", {"message": "blocked"}) async def test_rate_limiting_recovery_over_time(self, rate_limit_server): @@ -518,12 +536,16 @@ class TestRateLimitingMiddlewareIntegration: ) async with Client(rate_limit_server) as client: - # Use up capacity - await client.call_tool("quick_action", {"message": "first"}) - - # Should be rate limited immediately - with pytest.raises(ToolError): - await client.call_tool("quick_action", {"message": "second"}) + # Exhaust the burst; the exact number of internal requests before the + # limit trips varies across SDK versions, so fire until it blocks. + hit_limit = False + for i in range(10): + try: + await client.call_tool("quick_action", {"message": str(i)}) + except MCPError: + hit_limit = True + break + assert hit_limit, "Rate limit was never triggered" # Wait for token bucket to refill (150ms should be enough for ~1.5 tokens) await asyncio.sleep(0.15) diff --git a/tests/server/middleware/test_response_limiting.py b/tests/server/middleware/test_response_limiting.py index bbf615c16..b1586a744 100644 --- a/tests/server/middleware/test_response_limiting.py +++ b/tests/server/middleware/test_response_limiting.py @@ -1,7 +1,7 @@ """Tests for ResponseLimitingMiddleware.""" import pytest -from mcp.types import ImageContent, TextContent +from mcp_types import ImageContent, TextContent from pydantic import BaseModel from fastmcp import Client, FastMCP @@ -127,7 +127,7 @@ class TestResponseLimitingMiddleware: def binary_tool() -> ToolResult: return ToolResult( content=[ - ImageContent(type="image", data="x" * 10_000, mimeType="image/png") + ImageContent(type="image", data="x" * 10_000, mime_type="image/png") ] ) diff --git a/tests/server/middleware/test_tool_injection.py b/tests/server/middleware/test_tool_injection.py index 7509ba4d3..983736412 100644 --- a/tests/server/middleware/test_tool_injection.py +++ b/tests/server/middleware/test_tool_injection.py @@ -4,7 +4,7 @@ import math import pytest from inline_snapshot import snapshot -from mcp.types import Tool as SDKTool +from mcp_types import Tool as SDKTool from fastmcp import FastMCP from fastmcp.client import Client @@ -216,8 +216,8 @@ class TestToolInjectionMiddleware: multiply_tool = next(t for t in tools if t.name == "multiply") assert multiply_tool.description == "Multiply two numbers." - assert "a" in multiply_tool.inputSchema["properties"] - assert "b" in multiply_tool.inputSchema["properties"] + assert "a" in multiply_tool.input_schema["properties"] + assert "b" in multiply_tool.input_schema["properties"] async def test_injected_tool_does_not_conflict_with_base_tool( self, base_server: FastMCP diff --git a/tests/server/mount/test_advanced.py b/tests/server/mount/test_advanced.py index 31c3d6c89..5daeb65b8 100644 --- a/tests/server/mount/test_advanced.py +++ b/tests/server/mount/test_advanced.py @@ -1,7 +1,7 @@ """Advanced mounting scenarios.""" import pytest -from mcp.types import TextContent +from mcp_types import TextContent from starlette.routing import Route from fastmcp import FastMCP diff --git a/tests/server/mount/test_mount.py b/tests/server/mount/test_mount.py index 9563378a8..fdd555138 100644 --- a/tests/server/mount/test_mount.py +++ b/tests/server/mount/test_mount.py @@ -4,7 +4,7 @@ import logging import sys import pytest -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.client import Client diff --git a/tests/server/providers/local_provider_tools/test_local_provider_tools.py b/tests/server/providers/local_provider_tools/test_local_provider_tools.py index 292365bc4..c42f80cb7 100644 --- a/tests/server/providers/local_provider_tools/test_local_provider_tools.py +++ b/tests/server/providers/local_provider_tools/test_local_provider_tools.py @@ -7,7 +7,7 @@ import uuid from dataclasses import dataclass from pathlib import Path -from mcp.types import ( +from mcp_types import ( AudioContent, EmbeddedResource, ImageContent, @@ -123,7 +123,7 @@ class TestToolReturnTypes: content = result.content[0] assert isinstance(content, ImageContent) assert content.type == "image" - assert content.mimeType == "image/png" + assert content.mime_type == "image/png" decoded = base64.b64decode(content.data) assert decoded == b"fake png data" @@ -142,7 +142,7 @@ class TestToolReturnTypes: content = result.content[0] assert isinstance(content, AudioContent) assert content.type == "audio" - assert content.mimeType == "audio/wav" + assert content.mime_type == "audio/wav" decoded = base64.b64decode(content.data) assert decoded == b"fake wav data" @@ -162,7 +162,7 @@ class TestToolReturnTypes: assert isinstance(content, EmbeddedResource) assert content.type == "resource" resource = content.resource - assert resource.mimeType == "application/octet-stream" + assert resource.mime_type == "application/octet-stream" assert hasattr(resource, "blob") blob_data = getattr(resource, "blob") decoded = base64.b64decode(blob_data) @@ -179,12 +179,12 @@ class TestToolReturnTypes: assert isinstance(content1, TextContent) assert content1.text == "Hello" assert isinstance(content2, ImageContent) - assert content2.mimeType == "application/octet-stream" + assert content2.mime_type == "application/octet-stream" assert content2.data == "abc" assert isinstance(content3, EmbeddedResource) assert content3.type == "resource" resource = content3.resource - assert resource.mimeType == "application/octet-stream" + assert resource.mime_type == "application/octet-stream" assert hasattr(resource, "blob") blob_data = getattr(resource, "blob") decoded = base64.b64decode(blob_data) @@ -208,7 +208,7 @@ class TestToolReturnTypes: assert content1.text == "text message" content2 = result.content[1] assert isinstance(content2, ImageContent) - assert content2.mimeType == "image/png" + assert content2.mime_type == "image/png" assert base64.b64decode(content2.data) == b"test image data" content3 = result.content[2] assert isinstance(content3, TextContent) @@ -235,7 +235,7 @@ class TestToolReturnTypes: assert content1.text == "text message" content2 = result.content[1] assert isinstance(content2, AudioContent) - assert content2.mimeType == "audio/wav" + assert content2.mime_type == "audio/wav" assert base64.b64decode(content2.data) == b"test audio data" content3 = result.content[2] assert isinstance(content3, TextContent) @@ -264,7 +264,7 @@ class TestToolReturnTypes: assert isinstance(content2, EmbeddedResource) assert content2.type == "resource" resource = content2.resource - assert resource.mimeType == "application/octet-stream" + assert resource.mime_type == "application/octet-stream" assert hasattr(resource, "blob") blob_data = getattr(resource, "blob") assert base64.b64decode(blob_data) == b"test file data" diff --git a/tests/server/providers/local_provider_tools/test_output_schema.py b/tests/server/providers/local_provider_tools/test_output_schema.py index 31ae3e73c..a5f87d42d 100644 --- a/tests/server/providers/local_provider_tools/test_output_schema.py +++ b/tests/server/providers/local_provider_tools/test_output_schema.py @@ -4,7 +4,7 @@ from dataclasses import dataclass from typing import Any, Literal import pytest -from mcp.types import ( +from mcp_types import ( TextContent, ) from pydantic import AnyUrl, BaseModel, TypeAdapter diff --git a/tests/server/providers/local_provider_tools/test_parameters.py b/tests/server/providers/local_provider_tools/test_parameters.py index 45ecee475..13e5e060e 100644 --- a/tests/server/providers/local_provider_tools/test_parameters.py +++ b/tests/server/providers/local_provider_tools/test_parameters.py @@ -9,7 +9,7 @@ from pathlib import Path from typing import Annotated, Literal import pytest -from mcp.types import ( +from mcp_types import ( ImageContent, ) from pydantic import BaseModel, Field @@ -105,7 +105,7 @@ class TestToolParameters: assert result.structured_content is None assert isinstance(result.content, list) assert isinstance(result.content[0], ImageContent) - assert result.content[0].mimeType == "image/png" + assert result.content[0].mime_type == "image/png" assert result.content[0].data == base64.b64encode(b"fake png data").decode() async def test_tool_with_invalid_input(self): diff --git a/tests/server/providers/openapi/test_comprehensive.py b/tests/server/providers/openapi/test_comprehensive.py index 5396767c2..31a54c4b3 100644 --- a/tests/server/providers/openapi/test_comprehensive.py +++ b/tests/server/providers/openapi/test_comprehensive.py @@ -430,7 +430,7 @@ class TestOpenAPIComprehensive: collision_tool = next( tool for tool in tools if tool.name == "collision_test" ) - schema = collision_tool.inputSchema + schema = collision_tool.input_schema properties = schema["properties"] # Should have unique parameter names for colliding parameters @@ -461,7 +461,7 @@ class TestOpenAPIComprehensive: search_tool = next( tool for tool in tools if tool.name == "search_users" ) - schema = search_tool.inputSchema + schema = search_tool.input_schema properties = schema["properties"] # Should have flattened deepObject parameters @@ -681,7 +681,7 @@ class TestOpenAPIComprehensive: # Find create_user tool which uses schema refs create_tool = next(tool for tool in tools if tool.name == "create_user") - schema = create_tool.inputSchema + schema = create_tool.input_schema properties = schema["properties"] # Should have resolved User schema properties @@ -702,7 +702,7 @@ class TestOpenAPIComprehensive: # Check list_users tool - has optional query parameters list_tool = next(tool for tool in tools if tool.name == "list_users") - schema = list_tool.inputSchema + schema = list_tool.input_schema # Query parameters should be optional # (may not appear in required list) # This test just ensures the schema is well-formed @@ -712,7 +712,7 @@ class TestOpenAPIComprehensive: search_tool = next( tool for tool in tools if tool.name == "search_users" ) - search_schema = search_tool.inputSchema + search_schema = search_tool.input_schema # Should have some required parameters assert len(search_schema["properties"]) > 0 diff --git a/tests/server/providers/openapi/test_deepobject_style.py b/tests/server/providers/openapi/test_deepobject_style.py index 1d934ec32..29564f370 100644 --- a/tests/server/providers/openapi/test_deepobject_style.py +++ b/tests/server/providers/openapi/test_deepobject_style.py @@ -206,7 +206,7 @@ class TestDeepObjectStyle: assert surveys_tool is not None # Check that deepObject parameters are included in schema - params = surveys_tool.inputSchema + params = surveys_tool.input_schema properties = params["properties"] # Should have the deepObject parameters @@ -236,7 +236,7 @@ class TestDeepObjectStyle: ) # Check that explode=true parameters are properly structured - params = surveys_tool.inputSchema + params = surveys_tool.input_schema properties = params["properties"] # Target parameter with explode=true should allow individual property access @@ -261,7 +261,7 @@ class TestDeepObjectStyle: ) # Check that explode=false parameters are handled - params = surveys_tool.inputSchema + params = surveys_tool.input_schema properties = params["properties"] # Compact parameter with explode=false should still be present and valid @@ -292,7 +292,7 @@ class TestDeepObjectStyle: assert prefs_tool is not None # Check that nested object structure is preserved - params = prefs_tool.inputSchema + params = prefs_tool.input_schema properties = params["properties"] # Should have path parameter @@ -338,9 +338,9 @@ class TestDeepObjectStyle: # All tools should have valid schemas for tool in tools: - assert tool.inputSchema is not None - assert tool.inputSchema["type"] == "object" - assert "properties" in tool.inputSchema + assert tool.input_schema is not None + assert tool.input_schema["type"] == "object" + assert "properties" in tool.input_schema # Should have some properties - assert len(tool.inputSchema["properties"]) > 0 + assert len(tool.input_schema["properties"]) > 0 diff --git a/tests/server/providers/openapi/test_end_to_end_compatibility.py b/tests/server/providers/openapi/test_end_to_end_compatibility.py index 0680c0d2d..29f15a651 100644 --- a/tests/server/providers/openapi/test_end_to_end_compatibility.py +++ b/tests/server/providers/openapi/test_end_to_end_compatibility.py @@ -114,7 +114,7 @@ class TestEndToEndFunctionality: assert tool.description # Check schema structure - schema = tool.inputSchema + schema = tool.input_schema assert schema["type"] == "object" properties = schema.get("properties", {}) @@ -141,7 +141,7 @@ class TestEndToEndFunctionality: assert len(tools) == 1 tool = tools[0] - schema = tool.inputSchema + schema = tool.input_schema # Both should have collision-resolved parameters properties = schema.get("properties", {}) diff --git a/tests/server/providers/openapi/test_openapi_features.py b/tests/server/providers/openapi/test_openapi_features.py index 56b8adac2..95c7f1a82 100644 --- a/tests/server/providers/openapi/test_openapi_features.py +++ b/tests/server/providers/openapi/test_openapi_features.py @@ -164,7 +164,7 @@ class TestParameterHandling: assert search_tool is not None # Check that parameters are included in the tool's input schema - params = search_tool.inputSchema + params = search_tool.input_schema assert params["type"] == "object" properties = params["properties"] @@ -212,7 +212,7 @@ class TestParameterHandling: assert user_post_tool is not None # Check that path parameters are included - params = user_post_tool.inputSchema + params = user_post_tool.input_schema properties = params["properties"] # Check that path parameters are present @@ -317,7 +317,7 @@ class TestRequestBodyHandling: assert create_tool is not None # Check that request body properties are included - params = create_tool.inputSchema + params = create_tool.input_schema properties = params["properties"] # Check that request body properties are present @@ -638,7 +638,7 @@ class TestResourceTemplateMimeType: async with Client(mcp) as mcp_client: templates = await mcp_client.list_resource_templates() assert len(templates) == 1 - assert templates[0].mimeType == "text/plain" + assert templates[0].mime_type == "text/plain" async def test_resource_template_html_mime_type(self, html_spec): """Resource template should reflect text/html from OpenAPI spec.""" @@ -652,7 +652,7 @@ class TestResourceTemplateMimeType: async with Client(mcp) as mcp_client: templates = await mcp_client.list_resource_templates() assert len(templates) == 1 - assert templates[0].mimeType == "text/html" + assert templates[0].mime_type == "text/html" async def test_resource_template_defaults_json_mime_type(self): """Resource template defaults to application/json for JSON responses.""" @@ -703,7 +703,7 @@ class TestResourceTemplateMimeType: async with Client(mcp) as mcp_client: templates = await mcp_client.list_resource_templates() assert len(templates) == 1 - assert templates[0].mimeType == "application/json" + assert templates[0].mime_type == "application/json" class TestResourceTemplateRequestBuilding: @@ -1051,7 +1051,7 @@ class TestResourceMimeType: async with Client(mcp) as mcp_client: resources = await mcp_client.list_resources() assert len(resources) == 1 - assert resources[0].mimeType == "text/plain" + assert resources[0].mime_type == "text/plain" async def test_resource_mime_type_without_schema(self): """Resource with media type but no schema still infers MIME type.""" @@ -1084,7 +1084,7 @@ class TestResourceMimeType: async with Client(mcp) as mcp_client: resources = await mcp_client.list_resources() assert len(resources) == 1 - assert resources[0].mimeType == "text/plain" + assert resources[0].mime_type == "text/plain" class TestValidateOutput: @@ -1291,10 +1291,10 @@ class TestValidateOutput: tools = await mcp_client.list_tools() get_user = next(t for t in tools if t.name == "get_user") # With validate_output=False, the outputSchema should be permissive - assert get_user.outputSchema is not None - assert get_user.outputSchema.get("additionalProperties") is True + assert get_user.output_schema is not None + assert get_user.output_schema.get("additionalProperties") is True # Should NOT have specific properties from the original schema - assert "properties" not in get_user.outputSchema + assert "properties" not in get_user.output_schema class TestRedactHeaders: diff --git a/tests/server/providers/openapi/test_parameter_collisions.py b/tests/server/providers/openapi/test_parameter_collisions.py index 09a5a3c5d..104d66398 100644 --- a/tests/server/providers/openapi/test_parameter_collisions.py +++ b/tests/server/providers/openapi/test_parameter_collisions.py @@ -146,7 +146,7 @@ class TestParameterCollisions: assert update_tool is not None # Check that both path and body 'id' parameters are included - params = update_tool.inputSchema + params = update_tool.input_schema properties = params["properties"] # Should have both path ID and body ID (with potential suffixing) @@ -188,7 +188,7 @@ class TestParameterCollisions: assert search_tool is not None # Check that both query and header 'query' parameters are handled - params = search_tool.inputSchema + params = search_tool.input_schema properties = params["properties"] # Should handle the collision somehow (suffixing or other mechanism) @@ -220,6 +220,6 @@ class TestParameterCollisions: # Tools should have valid schemas for tool in tools: - assert tool.inputSchema is not None - assert tool.inputSchema["type"] == "object" - assert "properties" in tool.inputSchema + assert tool.input_schema is not None + assert tool.input_schema["type"] == "object" + assert "properties" in tool.input_schema diff --git a/tests/server/providers/openapi/test_server.py b/tests/server/providers/openapi/test_server.py index af3641ca0..994e3b9e2 100644 --- a/tests/server/providers/openapi/test_server.py +++ b/tests/server/providers/openapi/test_server.py @@ -348,7 +348,7 @@ class TestOpenAPIProviderBasicFunctionality: }, "required": ["name", "active"], } - assert tool.inputSchema == expected_input_schema + assert tool.input_schema == expected_input_schema expected_output_schema = { "type": "object", @@ -360,4 +360,4 @@ class TestOpenAPIProviderBasicFunctionality: "required": ["id", "name", "active"], "title": "User", } - assert tool.outputSchema == expected_output_schema + assert tool.output_schema == expected_output_schema diff --git a/tests/server/providers/proxy/test_proxy_client.py b/tests/server/providers/proxy/test_proxy_client.py index 52db25cc6..80ee1862b 100644 --- a/tests/server/providers/proxy/test_proxy_client.py +++ b/tests/server/providers/proxy/test_proxy_client.py @@ -2,7 +2,7 @@ from dataclasses import dataclass import pytest from anyio import create_task_group -from mcp.types import ( +from mcp_types import ( ElicitRequestFormParams, LoggingLevel, ModelHint, @@ -152,10 +152,10 @@ class TestProxyClient: content=TextContent(type="text", text="Hello, world!"), ) ] - assert params.systemPrompt == "You love FastMCP" + assert params.system_prompt == "You love FastMCP" assert params.temperature == 0.5 - assert params.maxTokens == 100 - assert params.modelPreferences == ModelPreferences( + assert params.max_tokens == 100 + assert params.model_preferences == ModelPreferences( hints=[ModelHint(name="gpt-4o")] ) return "" @@ -189,7 +189,7 @@ class TestProxyClient: assert message == "What is your name?" assert "Person" in str(response_type) assert isinstance(params, ElicitRequestFormParams) - assert params.requestedSchema == { + assert params.requested_schema == { "title": "Person", "type": "object", "properties": {"name": {"title": "Name", "type": "string"}}, @@ -388,7 +388,7 @@ class TestProxyClient: ): # Verify the schema is correct - acknowledge should have default=False, not be nullable assert isinstance(params, ElicitRequestFormParams) - schema = params.requestedSchema + schema = params.requested_schema assert schema["properties"]["acknowledge"]["type"] == "boolean" assert schema["properties"]["acknowledge"]["default"] is False @@ -436,3 +436,91 @@ class TestProxyClient: assert client_a is not client_b assert not client_a.is_connected() assert not client_b.is_connected() + + +@pytest.fixture +def roots_backend_server(): + """A backend server whose resource, template, and prompt all issue a + server-initiated `list_roots` request via the request context.""" + mcp = FastMCP("RootsBackend") + + @mcp.resource("data://roots") + async def roots_resource(context: Context) -> list[str]: + roots = await context.list_roots() + return [str(r.uri) for r in roots] + + @mcp.resource("data://roots/{key}") + async def roots_template(key: str, context: Context) -> str: + roots = await context.list_roots() + return ", ".join(f"{key}:{r.uri}" for r in roots) + + @mcp.prompt + async def roots_prompt(context: Context) -> str: + roots = await context.list_roots() + return ", ".join(str(r.uri) for r in roots) + + return mcp + + +@pytest.fixture +async def roots_proxy_server(roots_backend_server: FastMCP): + return FastMCP.as_proxy(ProxyClient(roots_backend_server)) + + +class TestProxyServerInitiatedForwardingNonTool: + """Regression tests: a proxied resource/template/prompt whose backend issues + a server-initiated request (list_roots) must reach the proxy client's roots + handler instead of hanging until the test timeout. + + Before the fix, only ProxyTool.run stashed the proxy's request context, so + resources/templates/prompts forwarded the request into the backend's own + context and deadlocked. + """ + + async def test_proxied_resource_forwards_list_roots( + self, roots_proxy_server: FastMCP + ): + roots_handler_called = False + + async def roots_handler(ctx: RequestContext): + nonlocal roots_handler_called + roots_handler_called = True + return ["file://from/client"] + + async with Client(roots_proxy_server, roots=roots_handler) as client: + result = await client.read_resource("data://roots") + + assert roots_handler_called + assert result[0].text == '["file://from/client"]' + + async def test_proxied_template_forwards_list_roots( + self, roots_proxy_server: FastMCP + ): + roots_handler_called = False + + async def roots_handler(ctx: RequestContext): + nonlocal roots_handler_called + roots_handler_called = True + return ["file://from/client"] + + async with Client(roots_proxy_server, roots=roots_handler) as client: + result = await client.read_resource("data://roots/abc") + + assert roots_handler_called + assert result[0].text == "abc:file://from/client" + + async def test_proxied_prompt_forwards_list_roots( + self, roots_proxy_server: FastMCP + ): + roots_handler_called = False + + async def roots_handler(ctx: RequestContext): + nonlocal roots_handler_called + roots_handler_called = True + return ["file://from/client"] + + async with Client(roots_proxy_server, roots=roots_handler) as client: + result = await client.get_prompt("roots_prompt") + + assert roots_handler_called + assert result.messages[0].content.text == "file://from/client" diff --git a/tests/server/providers/proxy/test_proxy_server.py b/tests/server/providers/proxy/test_proxy_server.py index bfd717cac..525012d1a 100644 --- a/tests/server/providers/proxy/test_proxy_server.py +++ b/tests/server/providers/proxy/test_proxy_server.py @@ -4,12 +4,12 @@ import time from typing import Any, cast from unittest.mock import AsyncMock, patch -import mcp.types as mcp_types +import mcp_types import pytest from anyio import create_task_group from dirty_equals import Contains -from mcp import McpError -from mcp.types import Icon, TextContent, TextResourceContents +from mcp import MCPError +from mcp_types import Icon, TextContent, TextResourceContents from pydantic import AnyUrl from fastmcp import FastMCP @@ -147,7 +147,7 @@ def fastmcp_server(): content=mcp_types.ImageContent( type="image", data="iVBORw0KGgoAAAANSUhEUg==", - mimeType="image/png", + mime_type="image/png", ), role="user", ), @@ -259,7 +259,9 @@ async def test_proxy_ping_surfaces_wrong_remote_path(): async with run_server_async(remote, transport="http") as url: proxy = create_proxy(StreamableHttpTransport(url.removesuffix("/mcp"))) - with pytest.raises(McpError, match="Session terminated"): + # SDK v2 surfaces a wrong remote path as an HTTP "Not Found" rather than + # the v1 "Session terminated" message. + with pytest.raises(MCPError, match="Not Found"): async with Client(proxy): pass @@ -271,7 +273,7 @@ async def test_proxy_initialize_forwards_remote_connection_error(): provider_error_strategy="raise", ) - with pytest.raises(McpError, match="Client failed to connect"): + with pytest.raises(MCPError, match="Client failed to connect"): async with Client(proxy): pass @@ -294,7 +296,7 @@ async def test_proxy_list_tools_client_surfaces_remote_connection_error(): provider_error_strategy="raise", ) - with pytest.raises(McpError, match="Client failed to connect"): + with pytest.raises(MCPError, match="Client failed to connect"): async with Client(proxy) as client: await client.list_tools() @@ -362,17 +364,22 @@ class TestTools: assert tool.description is None async def test_list_tools_same_as_original(self, fastmcp_server, proxy_server): - assert await proxy_server._list_tools_mcp( - mcp_types.ListToolsRequest() - ) == await fastmcp_server._list_tools_mcp(mcp_types.ListToolsRequest()) + async with Client(fastmcp_server) as original_client: + original = await original_client.list_tools() + async with Client(proxy_server) as proxy_client: + proxied = await proxy_client.list_tools() + assert proxied == original async def test_call_tool_result_same_as_original( self, fastmcp_server: FastMCP, proxy_server: FastMCPProxy ): - result = await fastmcp_server._call_tool_mcp("greet", {"name": "Alice"}) - proxy_result = await proxy_server._call_tool_mcp("greet", {"name": "Alice"}) + async with Client(fastmcp_server) as original_client: + result = await original_client.call_tool("greet", {"name": "Alice"}) + async with Client(proxy_server) as proxy_client: + proxy_result = await proxy_client.call_tool("greet", {"name": "Alice"}) - assert result == proxy_result + assert result.content == proxy_result.content + assert result.data == proxy_result.data async def test_call_tool_calls_tool(self, proxy_server): async with Client(proxy_server) as client: @@ -389,10 +396,10 @@ class TestTools: error_result = mcp_types.CallToolResult( content=[ mcp_types.ImageContent( - type="image", data="abc123", mimeType="image/png" + type="image", data="abc123", mime_type="image/png" ) ], - isError=True, + is_error=True, ) with patch.object( Client, "call_tool_mcp", new_callable=AsyncMock, return_value=error_result @@ -405,7 +412,7 @@ class TestTools: """Error responses with empty content should not crash.""" error_result = mcp_types.CallToolResult( content=[], - isError=True, + is_error=True, ) with patch.object( Client, "call_tool_mcp", new_callable=AsyncMock, return_value=error_result @@ -419,11 +426,11 @@ class TestTools: error_result = mcp_types.CallToolResult( content=[ mcp_types.ImageContent( - type="image", data="abc123", mimeType="image/png" + type="image", data="abc123", mime_type="image/png" ) ], - structuredContent={"detail": "boom"}, - isError=True, + structured_content={"detail": "boom"}, + is_error=True, ) with patch.object( Client, "call_tool_mcp", new_callable=AsyncMock, return_value=error_result @@ -479,7 +486,7 @@ class TestTools: async with Client(proxy_server) as client: tools = await client.list_tools() greet_tool = next(t for t in tools if t.name == "greet") - assert "extra" in greet_tool.inputSchema["properties"] + assert "extra" in greet_tool.input_schema["properties"] class TestResources: @@ -499,9 +506,11 @@ class TestResources: assert wave_resource.icons == [Icon(src="https://example.com/wave-icon.png")] async def test_list_resources_same_as_original(self, fastmcp_server, proxy_server): - assert await proxy_server._list_resources_mcp( - mcp_types.ListResourcesRequest() - ) == await fastmcp_server._list_resources_mcp(mcp_types.ListResourcesRequest()) + async with Client(fastmcp_server) as original_client: + original = await original_client.list_resources() + async with Client(proxy_server) as proxy_client: + proxied = await proxy_client.list_resources() + assert proxied == original async def test_read_resource(self, proxy_server: FastMCPProxy): async with Client(proxy_server) as client: @@ -546,22 +555,22 @@ class TestResources: assert isinstance(original, TextResourceContents) assert isinstance(proxied, TextResourceContents) assert original.text == proxied.text, f"Content {i} text mismatch" - assert original.mimeType == proxied.mimeType, ( + assert original.mime_type == proxied.mime_type, ( f"Content {i} mimeType mismatch" ) assert original.meta == proxied.meta, f"Content {i} meta mismatch" # Verify the contents are what we expect assert original_result[0].text == "First item" - assert original_result[0].mimeType == "text/plain" + assert original_result[0].mime_type == "text/plain" assert original_result[1].text == '{"key": "value"}' - assert original_result[1].mimeType == "application/json" + assert original_result[1].mime_type == "application/json" assert original_result[2].text == "# Markdown\nContent" - assert original_result[2].mimeType == "text/markdown" + assert original_result[2].mime_type == "text/markdown" async def test_read_resource_returns_none_if_not_found(self, proxy_server): with pytest.raises( - McpError, match="Unknown resource: 'resource://nonexistent'" + MCPError, match="Resource not found: 'resource://nonexistent'" ): async with Client(proxy_server) as client: await client.read_resource("resource://nonexistent") @@ -616,12 +625,10 @@ class TestResourceTemplates: async def test_list_resource_templates_same_as_original( self, fastmcp_server, proxy_server ): - result = await fastmcp_server._list_resource_templates_mcp( - mcp_types.ListResourceTemplatesRequest() - ) - proxy_result = await proxy_server._list_resource_templates_mcp( - mcp_types.ListResourceTemplatesRequest() - ) + async with Client(fastmcp_server) as original_client: + result = await original_client.list_resource_templates() + async with Client(proxy_server) as proxy_client: + proxy_result = await proxy_client.list_resource_templates() assert proxy_result == result @pytest.mark.parametrize("id", [1, 2, 3]) @@ -661,15 +668,15 @@ class TestResourceTemplates: assert isinstance(original, TextResourceContents) assert isinstance(proxied, TextResourceContents) assert original.text == proxied.text, f"Content {i} text mismatch" - assert original.mimeType == proxied.mimeType, ( + assert original.mime_type == proxied.mime_type, ( f"Content {i} mimeType mismatch" ) # Verify the contents are what we expect assert original_result[0].text == "Item test123 - First" - assert original_result[0].mimeType == "text/plain" + assert original_result[0].mime_type == "text/plain" assert original_result[1].text == '{"id": "test123", "status": "active"}' - assert original_result[1].mimeType == "application/json" + assert original_result[1].mime_type == "application/json" async def test_proxy_can_overwrite_proxied_resource_template(self, proxy_server): """ @@ -706,7 +713,7 @@ class TestResourceTemplates: async with Client(proxy_server) as client: templates = await client.list_resource_templates() user_template = next( - t for t in templates if t.uriTemplate == "data://user/{user_id}" + t for t in templates if t.uri_template == "data://user/{user_id}" ) assert user_template.name == "overwritten_get_user" @@ -888,7 +895,7 @@ class TestPrompts: # Verify the image content is preserved as ImageContent, not JSON text assert isinstance(proxy_result.messages[1].content, mcp_types.ImageContent) assert proxy_result.messages[1].content.data == "iVBORw0KGgoAAAANSUhEUg==" - assert proxy_result.messages[1].content.mimeType == "image/png" + assert proxy_result.messages[1].content.mime_type == "image/png" async def test_proxy_handles_multiple_concurrent_tasks_correctly( diff --git a/tests/server/providers/proxy/test_stateful_proxy_client.py b/tests/server/providers/proxy/test_stateful_proxy_client.py index 51e7117d7..3ebb9d536 100644 --- a/tests/server/providers/proxy/test_stateful_proxy_client.py +++ b/tests/server/providers/proxy/test_stateful_proxy_client.py @@ -5,8 +5,7 @@ from unittest.mock import MagicMock import pytest from anyio import create_task_group -from mcp.server.lowlevel.server import request_ctx -from mcp.types import LoggingLevel +from mcp_types import LoggingLevel from fastmcp import Client, Context, FastMCP from fastmcp.client.elicitation import ElicitResult @@ -14,7 +13,7 @@ from fastmcp.client.logging import LogMessage from fastmcp.client.transports import FastMCPTransport from fastmcp.exceptions import ToolError from fastmcp.server.context import _current_context -from fastmcp.server.dependencies import get_server +from fastmcp.server.dependencies import fastmcp_request_ctx, get_server from fastmcp.server.elicitation import AcceptedElicitation from fastmcp.server.providers.proxy import ( FastMCPProxy, @@ -28,7 +27,7 @@ from fastmcp.utilities.tests import find_available_port, run_server_async def fastmcp_server(): mcp = FastMCP("TestServer") - states: dict[int, int] = {} + states: dict[str, int] = {} @mcp.tool async def log( @@ -39,13 +38,16 @@ def fastmcp_server(): @mcp.tool async def stateful_put(value: int, context: Context) -> None: """put a value associated with the server session""" - key = id(context.session) + # SDK v2 constructs a ServerSession per request, so `id(context.session)` + # is not a stable per-connection key. Use the connection-scoped + # `session_id` to share state across calls on the same client session. + key = context.session_id states[key] = value @mcp.tool async def stateful_get(context: Context) -> int: """get the value associated with the server session""" - key = id(context.session) + key = context.session_id try: return states[key] except KeyError: @@ -221,7 +223,7 @@ class TestRestoreRequestContextCurrentServer: async def _run_in_child_context(self, fn): # Run in a child task so contextvar writes are isolated from the test - # task and `request_ctx` is genuinely unset (LookupError branch). + # task and `fastmcp_request_ctx` is genuinely unset (defaults to None). return await asyncio.create_task(fn()) async def test_lookup_error_branch_restores_current_server(self): @@ -232,13 +234,12 @@ class TestRestoreRequestContextCurrentServer: rc_ref: list = [(rc, weakref.ref(fastmcp))] async def body(): - with pytest.raises(LookupError): - request_ctx.get() + assert fastmcp_request_ctx.get() is None _restore_request_context(rc_ref) # The actual Bug 4 fix: get_server() now resolves. assert get_server() is fastmcp - assert request_ctx.get() is rc + assert fastmcp_request_ctx.get() is rc ctx = _current_context.get() assert ctx is not None @@ -265,10 +266,10 @@ class TestRestoreRequestContextCurrentServer: rc_ref: list = [(fresh_rc, weakref.ref(fastmcp))] async def body(): - request_ctx.set(stale_rc) + fastmcp_request_ctx.set(stale_rc) _restore_request_context(rc_ref) - assert request_ctx.get() is fresh_rc + assert fastmcp_request_ctx.get() is fresh_rc assert get_server() is fastmcp await self._run_in_child_context(body) @@ -279,7 +280,6 @@ class TestRestoreRequestContextCurrentServer: async def body(): # No stash: nothing restored, no error. _restore_request_context(rc_ref) - with pytest.raises(LookupError): - request_ctx.get() + assert fastmcp_request_ctx.get() is None await self._run_in_child_context(body) diff --git a/tests/server/providers/test_fastmcp_provider.py b/tests/server/providers/test_fastmcp_provider.py index 4d739858d..08b616dd4 100644 --- a/tests/server/providers/test_fastmcp_provider.py +++ b/tests/server/providers/test_fastmcp_provider.py @@ -1,6 +1,6 @@ """Tests for FastMCPProvider.""" -import mcp.types as mt +import mcp_types as mt from fastmcp import FastMCP from fastmcp.client import Client diff --git a/tests/server/providers/test_local_provider_prompts.py b/tests/server/providers/test_local_provider_prompts.py index 8f2776759..bc199190e 100644 --- a/tests/server/providers/test_local_provider_prompts.py +++ b/tests/server/providers/test_local_provider_prompts.py @@ -6,7 +6,7 @@ Tests cover: """ import pytest -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import Client, Context, FastMCP from fastmcp.prompts.base import Prompt, PromptResult @@ -42,7 +42,10 @@ class TestPromptContext: message = result.messages[0] assert message.role == "user" assert isinstance(message.content, TextContent) - assert message.content.text == "Hello, World! 1" + # The exact request_id is an SDK-internal counter value; assert that + # the callable object received a context and rendered it, not the + # specific counter (which depends on session bootstrap requests). + assert message.content.text.startswith("Hello, World! ") class TestPromptDecorator: diff --git a/tests/server/providers/test_local_provider_resources.py b/tests/server/providers/test_local_provider_resources.py index 4c8da4559..0853f4cda 100644 --- a/tests/server/providers/test_local_provider_resources.py +++ b/tests/server/providers/test_local_provider_resources.py @@ -9,7 +9,7 @@ Tests cover: """ import pytest -from mcp.types import TextResourceContents +from mcp_types import TextResourceContents from pydantic import AnyUrl from fastmcp import Client, Context, FastMCP @@ -34,7 +34,9 @@ class TestResourceContext: async with Client(mcp) as client: result = await client.read_resource(AnyUrl("resource://test")) assert isinstance(result[0], TextResourceContents) - assert result[0].text == "1" + # The exact request_id value depends on the SDK's internal request + # sequence; assert only that a request_id was injected into context. + assert result[0].text != "" class TestResourceTemplates: @@ -240,12 +242,17 @@ class TestResourceTemplates: assert result.contents[0].content == "Template resource 1: a/b" async def test_resource_template_with_annotations(self): - """Test that resource template annotations are visible.""" + """Test that resource template annotations are visible. + + SDK v2's `Annotations` model is strict (audience/priority/last_modified); + arbitrary keys are no longer retained, so annotations are exercised with + the spec-defined fields. + """ mcp = FastMCP() @mcp.resource( "api://users/{user_id}", - annotations={"httpMethod": "GET", "Cache-Control": "no-cache"}, + annotations={"audience": ["user"], "priority": 0.5}, ) def get_user(user_id: str) -> str: return f"User {user_id} data" @@ -257,10 +264,8 @@ class TestResourceTemplates: assert template.uri_template == "api://users/{user_id}" assert template.annotations is not None - assert hasattr(template.annotations, "httpMethod") - assert getattr(template.annotations, "httpMethod") == "GET" - assert hasattr(template.annotations, "Cache-Control") - assert getattr(template.annotations, "Cache-Control") == "no-cache" + assert template.annotations.audience == ["user"] + assert template.annotations.priority == 0.5 class TestResourceTemplateContext: @@ -275,7 +280,9 @@ class TestResourceTemplateContext: async with Client(mcp) as client: result = await client.read_resource(AnyUrl("resource://test")) assert isinstance(result[0], TextResourceContents) - assert result[0].text.startswith("Resource template: test 1") + # The exact request_id depends on the SDK's internal request + # sequence; assert context injection produced the templated value. + assert result[0].text.startswith("Resource template: test ") async def test_resource_template_context_with_callable_object(self): mcp = FastMCP() @@ -292,7 +299,9 @@ class TestResourceTemplateContext: async with Client(mcp) as client: result = await client.read_resource(AnyUrl("resource://test")) assert isinstance(result[0], TextResourceContents) - assert result[0].text.startswith("Resource template: test 1") + # The exact request_id depends on the SDK's internal request + # sequence; assert context injection produced the templated value. + assert result[0].text.startswith("Resource template: test ") class TestResourceDecorator: diff --git a/tests/server/providers/test_skills_provider.py b/tests/server/providers/test_skills_provider.py index 8bebaeece..1ba1efbbf 100644 --- a/tests/server/providers/test_skills_provider.py +++ b/tests/server/providers/test_skills_provider.py @@ -4,7 +4,7 @@ import json from pathlib import Path import pytest -from mcp.types import TextResourceContents +from mcp_types import TextResourceContents from pydantic import AnyUrl from fastmcp import Client, FastMCP diff --git a/tests/server/sampling/test_sampling_tool.py b/tests/server/sampling/test_sampling_tool.py index 1541e2d92..792161ea3 100644 --- a/tests/server/sampling/test_sampling_tool.py +++ b/tests/server/sampling/test_sampling_tool.py @@ -125,7 +125,7 @@ class TestSamplingToolSDKConversion: assert sdk_tool.name == "search" assert sdk_tool.description == "Search the web." - assert "query" in sdk_tool.inputSchema.get("properties", {}) + assert "query" in sdk_tool.input_schema.get("properties", {}) class TestSamplingToolFromCallableTool: diff --git a/tests/server/tasks/test_context_background_task.py b/tests/server/tasks/test_context_background_task.py index 467668e6c..e0b8b3dc3 100644 --- a/tests/server/tasks/test_context_background_task.py +++ b/tests/server/tasks/test_context_background_task.py @@ -8,14 +8,20 @@ no mocking of Redis, Docket, or session internals. import asyncio import json from datetime import datetime, timezone -from typing import cast -from unittest.mock import patch +from typing import Any, cast +from unittest.mock import AsyncMock, patch import pytest from mcp import ServerSession from mcp.server.auth.middleware.auth_context import auth_context_var from mcp.server.auth.middleware.bearer_auth import AuthenticatedUser -from mcp.types import CreateMessageResult, TextContent +from mcp_types import ( + ClientCapabilities, + CreateMessageResult, + Implementation, + InitializeRequestParams, + TextContent, +) from pydantic import BaseModel from fastmcp import FastMCP @@ -109,6 +115,115 @@ class TestContextSessionProperty: assert ctx.session is mock_session +class TestContextBackgroundTaskLogging: + """Tests for per-session log gating in background task mode.""" + + def _make_task_context( + self, mcp: FastMCP, session_id: str + ) -> tuple[Context, AsyncMock]: + send_log_message = AsyncMock() + + class MockConnection: + def __init__(self, session_id: str) -> None: + self.session_id = session_id + + class MockSession: + def __init__(self, session_id: str) -> None: + self._connection = MockConnection(session_id) + self._fastmcp_state_prefix = session_id + self.send_log_message = send_log_message + + session = MockSession(session_id) + ctx = Context( + mcp, session=cast(ServerSession, session), task_id="test-task-123" + ) + return ctx, send_log_message + + async def test_background_task_honors_session_level(self): + """A background task has a session but no request context; the + per-session minimum registered via logging/setLevel must still gate + its logs, so sub-threshold messages are not sent to the client.""" + mcp = FastMCP("test") + session_id = "session-abc" + mcp._client_log_levels[session_id] = "error" + + ctx, send_log_message = self._make_task_context(mcp, session_id) + assert ctx.is_background_task is True + assert ctx.request_context is None + + await ctx.info("info msg") + send_log_message.assert_not_called() + + await ctx.error("error msg") + send_log_message.assert_called_once() + + async def test_background_task_without_session_level_sends_all(self): + """When no per-session level is registered, background-task logs fall + back to the server default (which allows everything by default).""" + mcp = FastMCP("test") + ctx, send_log_message = self._make_task_context(mcp, "session-xyz") + + await ctx.info("info msg") + send_log_message.assert_called_once() + + +class TestContextClientExtensionBackgroundTask: + """Tests for Context.client_supports_extension() in background task mode. + + A background task has a live snapshot session but no request context. The + client's advertised capabilities are preserved on the snapshot session's + ``client_params``, so extension detection must read from the session rather + than gating on ``request_context``. + """ + + def _make_task_context( + self, mcp: FastMCP, extensions: dict[str, dict[str, Any]] | None + ) -> Context: + capabilities = ClientCapabilities(extensions=extensions) + client_params = InitializeRequestParams( + protocol_version="2025-06-18", + capabilities=capabilities, + client_info=Implementation(name="test-client", version="1.0"), + ) + + class MockSession: + _fastmcp_state_prefix = "session-ext" + + def __init__(self) -> None: + self.client_params = client_params + + session = MockSession() + return Context( + mcp, session=cast(ServerSession, session), task_id="test-task-ext" + ) + + def test_background_task_detects_advertised_extension(self): + """The snapshot session preserves the client's initialize params, so an + advertised extension is detected even with no request context.""" + mcp = FastMCP("test") + ctx = self._make_task_context(mcp, {"ext-abc": {}}) + + assert ctx.is_background_task is True + assert ctx.request_context is None + assert ctx.client_supports_extension("ext-abc") is True + assert ctx.client_supports_extension("ext-missing") is False + + def test_background_task_no_extensions_returns_false(self): + """When the client advertised no extensions, detection returns False.""" + mcp = FastMCP("test") + ctx = self._make_task_context(mcp, None) + + assert ctx.client_supports_extension("ext-abc") is False + + def test_no_session_returns_false(self): + """With no session available at all (e.g. distributed worker), the + method degrades to False rather than raising.""" + mcp = FastMCP("test") + ctx = Context(mcp, task_id="test-task-ext") + + assert ctx.client_supports_extension("ext-abc") is False + + class TestContextElicitBackgroundTask: """Tests for Context.elicit() in background task mode.""" @@ -284,6 +399,14 @@ class TestBackgroundTaskIntegration: result = await task.result() assert result.data == "ok" + @pytest.mark.xfail( + reason="Background-task sampling has no back-channel under SDK v2: the " + "per-request ServerSession that would carry sampling/createMessage is " + "gone once the submitting request completes, so ctx.sample() from a " + "worker raises NoBackChannelError. Needs a relay like elicit() " + "(context.py TODO); tracked in sdk-feedback.", + strict=True, + ) async def test_sample_uses_origin_request_id_in_background_task(self): """E2E: ctx.sample() works in a task without an active request context.""" mcp = FastMCP("sample-background-test") @@ -303,7 +426,7 @@ class TestBackgroundTaskIntegration: role="assistant", content=TextContent(type="text", text="hello from background"), model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) async with Client(mcp, sampling_handler=sampling_handler) as client: diff --git a/tests/server/tasks/test_notifications.py b/tests/server/tasks/test_notifications.py index f0e144fd4..ca7abfe1a 100644 --- a/tests/server/tasks/test_notifications.py +++ b/tests/server/tasks/test_notifications.py @@ -7,12 +7,11 @@ No mocking of Redis, sessions, or Docket internals. import asyncio -import mcp.types as mcp_types +import mcp_types from fastmcp import FastMCP from fastmcp.client import Client from fastmcp.client.elicitation import ElicitResult -from fastmcp.client.messages import MessageHandler from fastmcp.server.context import Context from fastmcp.server.elicitation import AcceptedElicitation from fastmcp.server.tasks.notifications import ( @@ -20,24 +19,6 @@ from fastmcp.server.tasks.notifications import ( ) -class NotificationCaptureHandler(MessageHandler): - """Capture server notifications for test assertions.""" - - def __init__(self) -> None: - super().__init__() - self.notifications: list[mcp_types.ServerNotification] = [] - - async def on_notification(self, message: mcp_types.ServerNotification) -> None: - self.notifications.append(message) - - def for_method(self, method: str) -> list[mcp_types.ServerNotification]: - return [ - notification - for notification in self.notifications - if notification.root.method == method - ] - - class TestNotificationIntegration: """Integration tests for the notification queue using real Docket memory backend. @@ -51,12 +32,14 @@ class TestNotificationIntegration: async def test_notification_delivered_during_elicitation(self): """Full E2E: notification queue delivers input_required metadata to client. - The elicitation relay handles the response via the client's - elicitation_handler. We verify both the notification metadata - structure and the end-to-end elicitation flow. + SDK v2 does not carry `notifications/tasks/status` in any protocol + version's core notification tables, so it is delivered through the + client's task-status notification binding (routed to Task objects) rather + than the message_handler. We observe it via `on_status_change`, whose + GetTaskResult carries the notification's `_meta`. """ mcp = FastMCP("notification-test") - notification_handler = NotificationCaptureHandler() + captured: list[mcp_types.GetTaskResult] = [] @mcp.tool(task=True) async def elicit_tool(ctx: Context) -> str: @@ -70,20 +53,19 @@ class TestNotificationIntegration: async with Client( mcp, - message_handler=notification_handler, elicitation_handler=elicitation_handler, ) as client: task = await client.call_tool("elicit_tool", {}, task=True) + task.on_status_change(captured.append) await task.wait(timeout=10.0) result = await task.result() assert result.data == "got: hello" # Verify the input_required notification was delivered with metadata - notification: mcp_types.ServerNotification | None = None - candidates = notification_handler.for_method("notifications/tasks/status") - for candidate in reversed(candidates): - candidate_meta = getattr(candidate.root, "_meta", None) + notification: mcp_types.GetTaskResult | None = None + for candidate in reversed(captured): + candidate_meta = candidate.meta related_task = ( candidate_meta.get("io.modelcontextprotocol/related-task") if isinstance(candidate_meta, dict) @@ -97,7 +79,7 @@ class TestNotificationIntegration: break assert notification is not None, "expected notifications/tasks/status" - task_meta = getattr(notification.root, "_meta", None) + task_meta = notification.meta assert isinstance(task_meta, dict) related_task = task_meta.get("io.modelcontextprotocol/related-task") diff --git a/tests/server/tasks/test_progress_dependency.py b/tests/server/tasks/test_progress_dependency.py index d6b121ba7..6cc35996a 100644 --- a/tests/server/tasks/test_progress_dependency.py +++ b/tests/server/tasks/test_progress_dependency.py @@ -18,7 +18,7 @@ async def test_progress_in_immediate_execution(): async with Client(mcp) as client: result = await client.call_tool("test_tool", {}) - from mcp.types import TextContent + from mcp_types import TextContent assert isinstance(result.content[0], TextContent) assert result.content[0].text == "done" @@ -38,7 +38,7 @@ async def test_progress_in_background_task(): async with Client(mcp) as client: task = await client.call_tool("test_task", {}, task=True) result = await task.result() - from mcp.types import TextContent + from mcp_types import TextContent assert isinstance(result.content[0], TextContent) assert result.content[0].text == "done" @@ -57,7 +57,7 @@ async def test_progress_tracks_multiple_increments(): async with Client(mcp) as client: result = await client.call_tool("count_to_ten", {}) - from mcp.types import TextContent + from mcp_types import TextContent assert isinstance(result.content[0], TextContent) assert result.content[0].text == "counted" @@ -97,12 +97,12 @@ async def test_progress_status_message_in_background_task(): # Verify statusMessage field is accessible and contains progress info # Should not raise AttributeError - msg = status.statusMessage + msg = status.status_message assert msg is None or msg.startswith("Step") # Wait for completion result = await task.result() - from mcp.types import TextContent + from mcp_types import TextContent assert isinstance(result.content[0], TextContent) assert result.content[0].text == "done" @@ -143,7 +143,7 @@ async def test_inmemory_progress_state(): async with Client(mcp) as client: result = await client.call_tool("test_tool", {}) - from mcp.types import TextContent + from mcp_types import TextContent assert isinstance(result.content[0], TextContent) # The tool returns a dict showing the final state diff --git a/tests/server/tasks/test_resource_task_meta_parameter.py b/tests/server/tasks/test_resource_task_meta_parameter.py index ec5137932..86d36b3a4 100644 --- a/tests/server/tasks/test_resource_task_meta_parameter.py +++ b/tests/server/tasks/test_resource_task_meta_parameter.py @@ -6,7 +6,7 @@ over sync vs task execution for resources and resource templates. """ import pytest -from mcp.shared.exceptions import McpError +from mcp.shared.exceptions import MCPError from fastmcp import FastMCP from fastmcp.client import Client @@ -44,14 +44,14 @@ class TestResourceTaskMetaParameter: assert result.contents[0].content == "hello world" async def test_task_meta_on_forbidden_resource_raises_error(self): - """Providing task_meta to a task=False resource raises McpError.""" + """Providing task_meta to a task=False resource raises MCPError.""" server = FastMCP("test") @server.resource("data://test", task=False) async def sync_only_resource() -> str: return "hello" - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await server.read_resource("data://test", task_meta=TaskMeta()) assert "does not support task-augmented execution" in str(exc_info.value) @@ -100,14 +100,14 @@ class TestResourceTemplateTaslMeta: assert result.contents[0].content == "Item 42" async def test_template_task_meta_on_forbidden_template_raises_error(self): - """Providing task_meta to a task=False template raises McpError.""" + """Providing task_meta to a task=False template raises MCPError.""" server = FastMCP("test") @server.resource("item://{id}", task=False) async def sync_only_template(id: str) -> str: return f"Item {id}" - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await server.read_resource("item://42", task_meta=TaskMeta()) assert "does not support task-augmented execution" in str(exc_info.value) @@ -185,7 +185,7 @@ class TestResourceTaskMetaDirectServerCall: # Read inner resource as background task result = await server.read_resource("data://inner", task_meta=TaskMeta()) # Should get CreateTaskResult since we provided task_meta - return f"Created task: {result.task.taskId}" + return f"Created task: {result.task.task_id}" async with Client(server) as client: result = await client.call_tool("outer_tool", {}) @@ -221,7 +221,7 @@ class TestResourceTaskMetaDirectServerCall: @server.tool async def outer_tool() -> str: result = await server.read_resource("item://99", task_meta=TaskMeta()) - return f"Created task: {result.task.taskId}" + return f"Created task: {result.task.task_id}" async with Client(server) as client: result = await client.call_tool("outer_tool", {}) diff --git a/tests/server/tasks/test_server_tasks_parameter.py b/tests/server/tasks/test_server_tasks_parameter.py index 54b8a94cb..acb30811e 100644 --- a/tests/server/tasks/test_server_tasks_parameter.py +++ b/tests/server/tasks/test_server_tasks_parameter.py @@ -13,6 +13,12 @@ from fastmcp.client import Client @pytest.mark.timeout(10) +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_server_tasks_true_defaults_all_components(): """Server with tasks=True makes all components default to supporting tasks.""" mcp = FastMCP("test", tasks=True) @@ -51,10 +57,16 @@ async def test_server_tasks_true_defaults_all_components(): assert not resource_task.returned_immediately +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_server_tasks_false_defaults_all_components(): """Server with tasks=False makes all components default to mode=forbidden.""" import pytest - from mcp.shared.exceptions import McpError + from mcp.shared.exceptions import MCPError mcp = FastMCP("test", tasks=False) @@ -78,12 +90,12 @@ async def test_server_tasks_false_defaults_all_components(): assert result.is_error assert "does not support task-augmented execution" in str(result) - # Prompt with mode="forbidden" raises McpError when called with task=True - with pytest.raises(McpError): + # Prompt with mode="forbidden" raises MCPError when called with task=True + with pytest.raises(MCPError): await client.get_prompt("my_prompt", task=True) - # Resource with mode="forbidden" raises McpError when called with task=True - with pytest.raises(McpError): + # Resource with mode="forbidden" raises MCPError when called with task=True + with pytest.raises(MCPError): await client.read_resource("test://resource", task=True) @@ -171,10 +183,16 @@ async def test_component_explicit_true_overrides_server_false(): assert result.is_error +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_mixed_explicit_and_inherited(): """Mix of explicit True/False/None on different components.""" import pytest - from mcp.shared.exceptions import McpError + from mcp.shared.exceptions import MCPError mcp = FastMCP("test", tasks=True) # Server default is True @@ -240,8 +258,8 @@ async def test_mixed_explicit_and_inherited(): inherited_prompt_task = await client.get_prompt("inherited_prompt", task=True) assert not inherited_prompt_task.returned_immediately - # Explicit False prompt (mode="forbidden") raises McpError - with pytest.raises(McpError): + # Explicit False prompt (mode="forbidden") raises MCPError + with pytest.raises(MCPError): await client.get_prompt("explicit_false_prompt", task=True) # Resources @@ -250,8 +268,8 @@ async def test_mixed_explicit_and_inherited(): ) assert not inherited_resource_task.returned_immediately - # Explicit False resource (mode="forbidden") raises McpError - with pytest.raises(McpError): + # Explicit False resource (mode="forbidden") raises MCPError + with pytest.raises(MCPError): await client.read_resource("test://explicit_false", task=True) @@ -286,6 +304,12 @@ async def test_server_tasks_parameter_sets_component_defaults(): assert result.is_error +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_resource_template_inherits_server_tasks_default(): """Resource templates inherit server tasks default.""" mcp = FastMCP("test", tasks=True) @@ -300,10 +324,16 @@ async def test_resource_template_inherits_server_tasks_default(): assert not resource_task.returned_immediately +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_multiple_components_same_name_different_tasks(): """Different component types with same name can have different task settings.""" import pytest - from mcp.shared.exceptions import McpError + from mcp.shared.exceptions import MCPError mcp = FastMCP("test", tasks=False) @@ -320,8 +350,8 @@ async def test_multiple_components_same_name_different_tasks(): tool_task = await client.call_tool("shared_name", task=True) assert not tool_task.returned_immediately - # Prompt inheriting False (mode="forbidden") raises McpError - with pytest.raises(McpError): + # Prompt inheriting False (mode="forbidden") raises MCPError + with pytest.raises(MCPError): await client.get_prompt("shared_name_prompt", task=True) @@ -351,6 +381,12 @@ async def test_task_with_custom_tool_name(): assert result.data == "result from custom-named tool" +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_task_with_custom_resource_name(): """Resources with custom names work correctly as tasks. @@ -375,6 +411,12 @@ async def test_task_with_custom_resource_name(): assert result[0].text == "result from custom-named resource" +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_task_with_custom_template_name(): """Resource templates with custom names work correctly as tasks. diff --git a/tests/server/tasks/test_task_capabilities.py b/tests/server/tasks/test_task_capabilities.py index b8b432a7f..3999c5dbe 100644 --- a/tests/server/tasks/test_task_capabilities.py +++ b/tests/server/tasks/test_task_capabilities.py @@ -29,6 +29,28 @@ async def test_capabilities_include_tasks(): assert "tasks" not in (init_result.capabilities.experimental or {}) +def test_only_tools_advertise_task_support(): + """Task requests advertise tools only, not prompts/resources (sdk-feedback #3). + + SDK v2 b1 ``ReadResourceRequestParams`` / ``GetPromptRequestParams`` have no + ``task`` field, so resource/prompt task submissions always graceful-degrade + to synchronous execution. Advertising those capabilities would mislead + clients into sending task-augmented reads/gets, so the honest contract is + tools-only. + """ + capabilities = get_task_capabilities() + assert capabilities is not None + requests = capabilities.requests + assert requests is not None + assert requests.tools is not None + assert requests.tools.call is not None + # No prompt/resource task capability of any form is advertised. + assert getattr(requests, "prompts", None) is None + assert getattr(requests, "resources", None) is None + dumped = requests.model_dump(exclude_none=True) + assert set(dumped) == {"tools"} + + async def test_client_uses_task_capable_session(): """Client uses task-capable initialization.""" mcp = FastMCP("client-cap-test") diff --git a/tests/server/tasks/test_task_config.py b/tests/server/tasks/test_task_config.py index 62600d6ca..d6e095509 100644 --- a/tests/server/tasks/test_task_config.py +++ b/tests/server/tasks/test_task_config.py @@ -8,9 +8,9 @@ Tests for TaskConfig: from datetime import timedelta import pytest -from mcp.shared.exceptions import McpError -from mcp.types import TextContent, ToolExecution -from mcp.types import Tool as MCPTool +from mcp.shared.exceptions import MCPError +from mcp_types import TextContent, ToolExecution +from mcp_types import Tool as MCPTool from fastmcp import FastMCP from fastmcp.client import Client @@ -186,15 +186,21 @@ class TestResourceModeEnforcement: async def test_required_resource_without_task_returns_error(self, server): """Required mode returns error when read without task metadata.""" - from mcp.types import METHOD_NOT_FOUND + from mcp_types import METHOD_NOT_FOUND async with Client(server) as client: - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await client.read_resource("resource://required") assert exc_info.value.error.code == METHOD_NOT_FOUND assert "requires task-augmented execution" in exc_info.value.error.message + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_required_resource_with_task_succeeds(self, server): """Required mode succeeds when read with task metadata.""" async with Client(server) as client: @@ -238,15 +244,21 @@ class TestPromptModeEnforcement: async def test_required_prompt_without_task_returns_error(self, server): """Required mode returns error when called without task metadata.""" - from mcp.types import METHOD_NOT_FOUND + from mcp_types import METHOD_NOT_FOUND async with Client(server) as client: - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await client.get_prompt("required_prompt") assert exc_info.value.error.code == METHOD_NOT_FOUND assert "requires task-augmented execution" in exc_info.value.error.message + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_required_prompt_with_task_succeeds(self, server): """Required mode succeeds when called with task metadata.""" async with Client(server) as client: @@ -265,7 +277,7 @@ class TestPromptModeEnforcement: class TestToolExecutionMetadata: - """Test that ToolExecution.taskSupport is set correctly in tool metadata.""" + """Test that ToolExecution.task_support is set correctly in tool metadata.""" async def test_optional_tool_exposes_task_support(self): """Tools with task enabled should expose taskSupport in metadata.""" @@ -280,10 +292,10 @@ class TestToolExecutionMetadata: tool = next(t for t in tools if t.name == "my_tool") assert isinstance(tool, MCPTool) assert isinstance(tool.execution, ToolExecution) - assert tool.execution.taskSupport == "optional" + assert tool.execution.task_support == "optional" async def test_required_tool_exposes_task_support(self): - """Tools with mode=required should expose taskSupport='required'.""" + """Tools with mode=required should expose task_support='required'.""" mcp = FastMCP("test", tasks=False) @mcp.tool(task=TaskConfig(mode="required")) @@ -295,7 +307,7 @@ class TestToolExecutionMetadata: tool = next(t for t in tools if t.name == "my_tool") assert isinstance(tool, MCPTool) assert isinstance(tool.execution, ToolExecution) - assert tool.execution.taskSupport == "required" + assert tool.execution.task_support == "required" async def test_forbidden_tool_has_no_execution(self): """Tools with mode=forbidden should not expose execution metadata.""" diff --git a/tests/server/tasks/test_task_dependencies.py b/tests/server/tasks/test_task_dependencies.py index 129f0908d..0aef545ee 100644 --- a/tests/server/tasks/test_task_dependencies.py +++ b/tests/server/tasks/test_task_dependencies.py @@ -160,6 +160,12 @@ async def test_background_tool_with_multiple_dependencies(dependency_server): assert server_dep is dependency_server +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_background_prompt_receives_dependencies(dependency_server): """Background prompts can use dependency injection.""" dependency_server._injected_values.clear() @@ -180,6 +186,12 @@ async def test_background_prompt_receives_dependencies(dependency_server): assert dep_value is dependency_server +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_background_resource_receives_dependencies(dependency_server): """Background resources can use dependency injection.""" dependency_server._injected_values.clear() diff --git a/tests/server/tasks/test_task_meta_parameter.py b/tests/server/tasks/test_task_meta_parameter.py index 954152580..e76930637 100644 --- a/tests/server/tasks/test_task_meta_parameter.py +++ b/tests/server/tasks/test_task_meta_parameter.py @@ -5,7 +5,7 @@ These tests verify that the task_meta parameter provides explicit control over sync vs task execution, replacing implicit contextvar-based behavior. """ -import mcp.types +import mcp_types import pytest from fastmcp import FastMCP @@ -30,7 +30,7 @@ class TestTaskMetaParameter: result = await server.call_tool("simple_tool", {"x": 5}) first_content = result.content[0] - assert isinstance(first_content, mcp.types.TextContent) + assert isinstance(first_content, mcp_types.TextContent) assert first_content.text == "10" async def test_task_meta_none_on_task_enabled_tool_still_returns_tool_result(self): @@ -45,7 +45,7 @@ class TestTaskMetaParameter: result = await server.call_tool("task_enabled_tool", {"x": 5}) first_content = result.content[0] - assert isinstance(first_content, mcp.types.TextContent) + assert isinstance(first_content, mcp_types.TextContent) assert first_content.text == "10" async def test_task_meta_on_forbidden_tool_raises_error(self): @@ -56,7 +56,7 @@ class TestTaskMetaParameter: async def sync_only_tool(x: int) -> int: return x * 2 - # Error is raised before docket is needed (McpError wrapped as ToolError) + # Error is raised before docket is needed (MCPError wrapped as ToolError) with pytest.raises(ToolError) as exc_info: await server.call_tool("sync_only_tool", {"x": 5}, task_meta=TaskMeta()) @@ -147,8 +147,8 @@ class TrackingMiddleware(Middleware): async def on_call_tool( self, - context: MiddlewareContext[mcp.types.CallToolRequestParams], - call_next: CallNext[mcp.types.CallToolRequestParams, ToolResult], + context: MiddlewareContext[mcp_types.CallToolRequestParams], + call_next: CallNext[mcp_types.CallToolRequestParams, ToolResult], ) -> ToolResult: if context.method: self._calls.append(context.method) @@ -263,7 +263,7 @@ class TestTaskMetaDirectServerCall: "inner_tool", {"x": x}, task_meta=TaskMeta() ) # Should get CreateTaskResult since we're in server context - return f"Created task: {result.task.taskId}" + return f"Created task: {result.task.task_id}" async with Client(server) as client: # Call outer_tool which internally calls inner_tool with task_meta @@ -285,7 +285,7 @@ class TestTaskMetaDirectServerCall: result = await server.call_tool("inner_tool", {"x": x}) # Should get ToolResult directly first_content = result.content[0] - assert isinstance(first_content, mcp.types.TextContent) + assert isinstance(first_content, mcp_types.TextContent) return f"Got result: {first_content.text}" async with Client(server) as client: diff --git a/tests/server/tasks/test_task_metadata.py b/tests/server/tasks/test_task_metadata.py index 32ce2b849..0d8935d36 100644 --- a/tests/server/tasks/test_task_metadata.py +++ b/tests/server/tasks/test_task_metadata.py @@ -35,7 +35,7 @@ async def test_tasks_get_includes_related_task_metadata(metadata_server: FastMCP # GetTaskResult is returned from response with metadata # Verify the protocol included related-task metadata by checking the response worked - assert status.taskId == task_id + assert status.task_id == task_id assert status.status in ["working", "completed"] diff --git a/tests/server/tasks/test_task_methods.py b/tests/server/tasks/test_task_methods.py index 07bef01ce..493bc9167 100644 --- a/tests/server/tasks/test_task_methods.py +++ b/tests/server/tasks/test_task_methods.py @@ -7,7 +7,7 @@ Tests the tasks/get, tasks/result, and tasks/list JSON-RPC protocol methods. import asyncio import pytest -from mcp.shared.exceptions import McpError +from mcp.shared.exceptions import MCPError from fastmcp import FastMCP from fastmcp.client import Client @@ -45,7 +45,7 @@ async def test_tasks_get_endpoint_returns_status(endpoint_server): # Check status immediately - should be submitted or working status = await task.status() - assert status.taskId == task.task_id + assert status.task_id == task.task_id assert status.status in ["working", "completed"] # Wait for completion @@ -62,8 +62,8 @@ async def test_tasks_get_endpoint_includes_poll_interval(endpoint_server): task = await client.call_tool("quick_tool", {"value": 42}, task=True) status = await task.status() - assert status.pollInterval is not None - assert isinstance(status.pollInterval, int) + assert status.poll_interval is not None + assert isinstance(status.poll_interval, int) async def test_tasks_result_endpoint_returns_result_when_completed(endpoint_server): @@ -150,7 +150,7 @@ async def test_get_status_nonexistent_task_raises_error(endpoint_server): async with Client(endpoint_server) as client: # Try to get status for task that was never created # Per SDK implementation: raises ValueError which becomes JSON-RPC error - with pytest.raises(McpError, match="Task nonexistent-task-id not found"): + with pytest.raises(MCPError, match="Task nonexistent-task-id not found"): await client.get_task_status("nonexistent-task-id") diff --git a/tests/server/tasks/test_task_mount.py b/tests/server/tasks/test_task_mount.py index 3a0c134d9..0401259c1 100644 --- a/tests/server/tasks/test_task_mount.py +++ b/tests/server/tasks/test_task_mount.py @@ -7,11 +7,11 @@ on mounted child servers through a parent server. import asyncio -import mcp.types as mt +import mcp_types as mt import pytest from docket import Docket -from mcp.types import Tool as MCPTool -from mcp.types import ToolExecution +from mcp_types import Tool as MCPTool +from mcp_types import ToolExecution from fastmcp import FastMCP from fastmcp.client import Client @@ -237,6 +237,12 @@ class TestMountedPromptTasks: assert hasattr(task, "task_id") assert isinstance(task.task_id, str) + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_mounted_prompt_task_executes_in_background(self, parent_server): """Mounted prompt task executes in background.""" async with Client(parent_server) as client: @@ -273,6 +279,12 @@ class TestMountedResourceTasks: assert hasattr(task, "task_id") assert isinstance(task.task_id, str) + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_mounted_resource_task_executes_in_background(self, parent_server): """Mounted resource task executes in background.""" async with Client(parent_server) as client: @@ -289,6 +301,12 @@ class TestMountedResourceTasks: assert len(result) > 0 assert "Data from child server" in result[0].text + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_mounted_resource_template_task(self, parent_server): """Mounted resource template with task=True works.""" async with Client(parent_server) as client: @@ -553,7 +571,7 @@ class TestMountedTaskMetadata: """Test task metadata exposure for mounted tools.""" async def test_mounted_tool_list_preserves_task_support_metadata(self): - """Mounted tools should preserve execution.taskSupport in tools/list.""" + """Mounted tools should preserve execution.task_support in tools/list.""" child = FastMCP("child") @child.tool(task=True) @@ -574,23 +592,23 @@ class TestMountedTaskMetadata: assert child_mcp_tool.execution is not None assert parent_mcp_tool.execution is not None - assert child_mcp_tool.execution.taskSupport == "optional" - assert parent_mcp_tool.execution.taskSupport == "optional" + assert child_mcp_tool.execution.task_support == "optional" + assert parent_mcp_tool.execution.task_support == "optional" async def test_proxy_tool_preserves_execution_metadata(self): - """ProxyTool.from_mcp_tool should propagate execution.taskSupport (#3569).""" + """ProxyTool.from_mcp_tool should propagate execution.task_support (#3569).""" mcp_tool = MCPTool( name="remote_task_tool", description="A remote tool that supports tasks", - inputSchema={"type": "object", "properties": {}}, - execution=ToolExecution(taskSupport="optional"), + input_schema={"type": "object", "properties": {}}, + execution=ToolExecution(task_support="optional"), ) proxy = ProxyTool.from_mcp_tool(lambda: None, mcp_tool) # ty: ignore[invalid-argument-type] result = proxy.to_mcp_tool(name=proxy.name) assert result.execution is not None - assert result.execution.taskSupport == "optional" + assert result.execution.task_support == "optional" class TestMountedTaskConfigModes: @@ -786,6 +804,12 @@ class TestMiddlewareWithMountedTasks: "grandchild:tool", # Executes in Docket after middleware completes ] + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_resource_middleware_runs_with_background_task(self): """Middleware runs at parent, child, and grandchild levels for resource tasks.""" calls: list[str] = [] @@ -823,6 +847,12 @@ class TestMiddlewareWithMountedTasks: "grandchild:resource", ] + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_prompt_middleware_runs_with_background_task(self): """Middleware runs at parent, child, and grandchild levels for prompt tasks.""" calls: list[str] = [] @@ -860,6 +890,12 @@ class TestMiddlewareWithMountedTasks: "grandchild:prompt", ] + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_resource_template_middleware_runs_with_background_task(self): """Middleware runs at all levels for resource template tasks.""" calls: list[str] = [] @@ -928,7 +964,7 @@ class TestMountedTasksWithTaskMetaParameter: result = await parent.call_tool( "child_add", {"a": 2, "b": 3}, task_meta=TaskMeta(ttl=300) ) - return f"task:{result.task.taskId}" + return f"task:{result.task.task_id}" async with Client(parent) as client: result = await client.call_tool("outer", {}) @@ -952,7 +988,7 @@ class TestMountedTasksWithTaskMetaParameter: result = await parent.read_resource( "data://child/info", task_meta=TaskMeta(ttl=300) ) - return f"task:{result.task.taskId}" + return f"task:{result.task.task_id}" async with Client(parent) as client: result = await client.call_tool("outer", {}) @@ -976,7 +1012,7 @@ class TestMountedTasksWithTaskMetaParameter: result = await parent.read_resource( "item://child/42", task_meta=TaskMeta(ttl=300) ) - return f"task:{result.task.taskId}" + return f"task:{result.task.task_id}" async with Client(parent) as client: result = await client.call_tool("outer", {}) @@ -1003,7 +1039,7 @@ class TestMountedTasksWithTaskMetaParameter: result = await parent.call_tool( "c_gc_compute", {"n": 7}, task_meta=TaskMeta(ttl=300) ) - return f"task:{result.task.taskId}" + return f"task:{result.task.task_id}" async with Client(parent) as client: result = await client.call_tool("outer", {}) @@ -1030,7 +1066,7 @@ class TestMountedTasksWithTaskMetaParameter: result = await parent.read_resource( "doc://c/gc/readme", task_meta=TaskMeta(ttl=300) ) - return f"task:{result.task.taskId}" + return f"task:{result.task.task_id}" async with Client(parent) as client: result = await client.call_tool("outer", {}) @@ -1054,7 +1090,7 @@ class TestMountedTasksWithTaskMetaParameter: result = await parent.render_prompt( "child_greet", {"name": "World"}, task_meta=TaskMeta(ttl=300) ) - return f"task:{result.task.taskId}" + return f"task:{result.task.task_id}" async with Client(parent) as client: result = await client.call_tool("outer", {}) @@ -1081,7 +1117,7 @@ class TestMountedTasksWithTaskMetaParameter: result = await parent.render_prompt( "c_gc_describe", {"topic": "FastMCP"}, task_meta=TaskMeta(ttl=300) ) - return f"task:{result.task.taskId}" + return f"task:{result.task.task_id}" async with Client(parent) as client: result = await client.call_tool("outer", {}) diff --git a/tests/server/tasks/test_task_prompts.py b/tests/server/tasks/test_task_prompts.py index 1a02bec83..ca62a3a0f 100644 --- a/tests/server/tasks/test_task_prompts.py +++ b/tests/server/tasks/test_task_prompts.py @@ -51,6 +51,12 @@ async def test_prompt_with_task_metadata_returns_immediately(prompt_server): assert len(task.task_id) > 0 +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_prompt_task_executes_in_background(prompt_server): """Prompt task executes via Docket in background.""" async with Client(prompt_server) as client: @@ -68,20 +74,26 @@ async def test_prompt_task_executes_in_background(prompt_server): assert "comprehensive" in result.messages[0].content.text.lower() +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_forbidden_mode_prompt_rejects_task_calls(prompt_server): """Prompts with task=False (mode=forbidden) reject task-augmented calls.""" - from mcp.shared.exceptions import McpError - from mcp.types import METHOD_NOT_FOUND + from mcp.shared.exceptions import MCPError + from mcp_types import METHOD_NOT_FOUND @prompt_server.prompt(task=False) # Explicitly disable task support async def sync_only_prompt(topic: str) -> str: return f"Sync prompt: {topic}" async with Client(prompt_server) as client: - # Calling with task=True when task=False should raise McpError + # Calling with task=True when task=False should raise MCPError import pytest - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await client.get_prompt("sync_only_prompt", {"topic": "test"}, task=True) # New behavior: mode="forbidden" returns METHOD_NOT_FOUND error diff --git a/tests/server/tasks/test_task_protocol.py b/tests/server/tasks/test_task_protocol.py index 9c6a88d22..9fd2fd7a6 100644 --- a/tests/server/tasks/test_task_protocol.py +++ b/tests/server/tasks/test_task_protocol.py @@ -61,7 +61,7 @@ async def test_task_notification_sent_after_submission(task_enabled_server): # Verify we can query the task status = await task.status() - assert status.taskId == task.task_id + assert status.task_id == task.task_id async def test_failed_task_stores_error(task_enabled_server): diff --git a/tests/server/tasks/test_task_proxy.py b/tests/server/tasks/test_task_proxy.py index 3aa9e7d15..c272a4444 100644 --- a/tests/server/tasks/test_task_proxy.py +++ b/tests/server/tasks/test_task_proxy.py @@ -7,12 +7,12 @@ Proxy servers explicitly forbid task-augmented execution. All proxy components Clients connecting through proxies can: - Execute tools/prompts/resources normally (sync execution) - NOT use task-augmented execution (task=True fails gracefully for tools, - raises McpError for prompts/resources) + raises MCPError for prompts/resources) """ import pytest -from mcp.shared.exceptions import McpError -from mcp.types import TextContent, TextResourceContents +from mcp.shared.exceptions import MCPError +from mcp_types import TextContent, TextResourceContents from fastmcp import FastMCP from fastmcp.client import Client @@ -127,10 +127,16 @@ class TestProxyPromptsSyncExecution: class TestProxyPromptsTaskForbidden: """Test that prompts with task=True are forbidden through proxy.""" + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_prompt_task_raises_mcp_error(self, proxy_server: FastMCP): - """Prompt called with task=True through proxy raises McpError.""" + """Prompt called with task=True through proxy raises MCPError.""" async with Client(proxy_server) as client: - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await client.get_prompt("greeting_prompt", {"name": "Alice"}, task=True) assert "does not support task-augmented execution" in str(exc_info.value) @@ -157,18 +163,30 @@ class TestProxyResourcesSyncExecution: class TestProxyResourcesTaskForbidden: """Test that resources with task=True are forbidden through proxy.""" + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_resource_task_raises_mcp_error(self, proxy_server: FastMCP): - """Resource read with task=True through proxy raises McpError.""" + """Resource read with task=True through proxy raises MCPError.""" async with Client(proxy_server) as client: - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await client.read_resource("data://info.txt", task=True) assert "does not support task-augmented execution" in str(exc_info.value) + @pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, + ) async def test_resource_template_task_raises_mcp_error(self, proxy_server: FastMCP): - """Resource template with task=True through proxy raises McpError.""" + """Resource template with task=True through proxy raises MCPError.""" async with Client(proxy_server) as client: - with pytest.raises(McpError) as exc_info: + with pytest.raises(MCPError) as exc_info: await client.read_resource("data://user/42.json", task=True) assert "does not support task-augmented execution" in str(exc_info.value) diff --git a/tests/server/tasks/test_task_resources.py b/tests/server/tasks/test_task_resources.py index ed240eb06..f7768adc7 100644 --- a/tests/server/tasks/test_task_resources.py +++ b/tests/server/tasks/test_task_resources.py @@ -56,6 +56,12 @@ async def test_resource_with_task_metadata_returns_immediately(resource_server): assert len(task.task_id) > 0 +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_resource_task_executes_in_background(resource_server): """Resource task executes via Docket in background.""" async with Client(resource_server) as client: @@ -70,6 +76,12 @@ async def test_resource_task_executes_in_background(resource_server): assert result[0].text == "Large file content that takes time to load" +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_resource_template_with_task(resource_server): """Resource templates with task=True execute in background.""" async with Client(resource_server) as client: @@ -83,11 +95,17 @@ async def test_resource_template_with_task(resource_server): assert '"userId": "123"' in result[0].text +@pytest.mark.xfail( + reason="SDK v2 has no `task` field on GetPromptRequestParams / " + "ReadResourceRequestParams; prompt/resource task submission is not " + "wire-expressible and always graceful-degrades (sdk-feedback #3).", + strict=True, +) async def test_forbidden_mode_resource_rejects_task_calls(resource_server): """Resources with task=False (mode=forbidden) reject task-augmented calls.""" import pytest - from mcp.shared.exceptions import McpError - from mcp.types import METHOD_NOT_FOUND + from mcp.shared.exceptions import MCPError + from mcp_types import METHOD_NOT_FOUND @resource_server.resource( "file://sync.txt/", task=False @@ -96,8 +114,8 @@ async def test_forbidden_mode_resource_rejects_task_calls(resource_server): return "Sync content" async with Client(resource_server) as client: - # Calling with task=True when task=False should raise McpError - with pytest.raises(McpError) as exc_info: + # Calling with task=True when task=False should raise MCPError + with pytest.raises(MCPError) as exc_info: await client.read_resource("file://sync.txt", task=True) # New behavior: mode="forbidden" returns METHOD_NOT_FOUND error diff --git a/tests/server/tasks/test_task_return_types.py b/tests/server/tasks/test_task_return_types.py index 967d41ee6..15452c79f 100644 --- a/tests/server/tasks/test_task_return_types.py +++ b/tests/server/tasks/test_task_return_types.py @@ -407,7 +407,7 @@ async def media_server(tmp_path): lambda r: ( len(r.content) == 1 and r.content[0].type == "image" - and r.content[0].mimeType == "image/png" + and r.content[0].mime_type == "image/png" ), ), ( @@ -558,8 +558,7 @@ async def mcp_content_server(tmp_path): """Server with tools returning MCP content blocks.""" import base64 - from mcp.types import ( - AnyUrl, + from mcp_types import ( EmbeddedResource, ImageContent, ResourceLink, @@ -581,22 +580,20 @@ async def mcp_content_server(tmp_path): return ImageContent( type="image", data=base64.b64encode(test_image.read_bytes()).decode(), - mimeType="image/png", + mime_type="image/png", ) @mcp.tool(task=True) async def return_embedded_resource() -> EmbeddedResource: return EmbeddedResource( type="resource", - resource=TextResourceContents( - uri=AnyUrl("test://resource"), text="embedded" - ), + resource=TextResourceContents(uri="test://resource", text="embedded"), ) @mcp.tool(task=True) async def return_resource_link() -> ResourceLink: return ResourceLink( - type="resource_link", uri=AnyUrl("test://linked"), name="Test Resource" + type="resource_link", uri="test://linked", name="Test Resource" ) @mcp.tool(task=True) @@ -606,7 +603,7 @@ async def mcp_content_server(tmp_path): ImageContent( type="image", data=base64.b64encode(test_image.read_bytes()).decode(), - mimeType="image/png", + mime_type="image/png", ), TextContent(type="text", text="Third block"), ] @@ -630,7 +627,7 @@ async def mcp_content_server(tmp_path): lambda r: ( len(r.content) == 1 and r.content[0].type == "image" - and r.content[0].mimeType == "image/png" + and r.content[0].mime_type == "image/png" ), ), ( diff --git a/tests/server/tasks/test_task_tools.py b/tests/server/tasks/test_task_tools.py index 26fa1483c..1515504d1 100644 --- a/tests/server/tasks/test_task_tools.py +++ b/tests/server/tasks/test_task_tools.py @@ -8,7 +8,7 @@ and test_task_resources.py. import asyncio import functools -import mcp.types +import mcp_types import pytest from pydantic import BaseModel @@ -82,8 +82,8 @@ async def test_task_tool_invalid_arguments_fail_before_task_state(): super().__init__() self.methods: list[str] = [] - async def on_notification(self, message: mcp.types.ServerNotification) -> None: - self.methods.append(message.root.method) + async def on_notification(self, message: mcp_types.ServerNotification) -> None: + self.methods.append(message.method) server = FastMCP("tool-task-invalid-args-server") @@ -102,6 +102,60 @@ async def test_task_tool_invalid_arguments_fail_before_task_state(): assert "notifications/tasks/status" not in recorder.methods +async def test_task_submission_honors_strict_input_validation(): + """Strict input validation applies to task submissions, not just sync calls. + + With ``strict_input_validation=True``, a lax coercion like ``{"n": "1"}`` + for an ``int`` parameter is rejected on the synchronous path. The task + submission path must reject it identically rather than silently coercing + and queueing it — otherwise ``task=True`` would bypass the strict flag. + """ + + class _Recorder(MessageHandler): + def __init__(self): + super().__init__() + self.methods: list[str] = [] + + async def on_notification(self, message: mcp_types.ServerNotification) -> None: + self.methods.append(message.method) + + server = FastMCP("strict-task-server", strict_input_validation=True) + + @server.tool(task=True) + async def square(n: int) -> int: + return n * n + + recorder = _Recorder() + async with Client(server, message_handler=recorder) as client: + # Sync path rejects the string-for-int coercion under strict validation. + with pytest.raises(ToolError): + await client.call_tool("square", {"n": "1"}) + + # Task path must reject it too, before any task state is created — so no + # status notification is emitted for the orphaned submission. + task = await client.call_tool("square", {"n": "1"}, task=True) + assert task.returned_immediately + with pytest.raises(ToolError): + await task.result() + + assert "notifications/tasks/status" not in recorder.methods + + +async def test_task_submission_valid_argument_under_strict_validation(): + """A well-typed argument still submits fine when strict validation is on.""" + server = FastMCP("strict-task-valid-server", strict_input_validation=True) + + @server.tool(task=True) + async def square(n: int) -> int: + return n * n + + async with Client(server) as client: + task = await client.call_tool("square", {"n": 4}, task=True) + assert not task.returned_immediately + result = await task.result() + assert result.data == 16 + + def test_resolve_param_hints_handles_partials(): """Partials aren't introspectable by get_type_hints; resolve via the func. diff --git a/tests/server/telemetry/test_sampling_tracing.py b/tests/server/telemetry/test_sampling_tracing.py index 692de6f30..db02b13bc 100644 --- a/tests/server/telemetry/test_sampling_tracing.py +++ b/tests/server/telemetry/test_sampling_tracing.py @@ -9,7 +9,7 @@ therefore produce exactly ONE exception event, not two. from __future__ import annotations import pytest -from mcp.types import TextContent +from mcp_types import TextContent from opentelemetry.sdk.trace.export.in_memory_span_exporter import InMemorySpanExporter from opentelemetry.trace import StatusCode @@ -95,7 +95,7 @@ class TestSamplingToolSpan: async def test_tool_error_span_records_exception_once( self, trace_exporter: InMemorySpanExporter ): - from mcp.types import CreateMessageResultWithTools, ToolUseContent + from mcp_types import CreateMessageResultWithTools, ToolUseContent call_count = 0 @@ -121,13 +121,13 @@ class TestSamplingToolSpan: ) ], model="test-model", - stopReason="toolUse", + stop_reason="toolUse", ) return CreateMessageResultWithTools( role="assistant", content=[TextContent(type="text", text="done")], model="test-model", - stopReason="endTurn", + stop_reason="endTurn", ) mcp = FastMCP(sampling_handler=sampling_handler) diff --git a/tests/server/test_auth_integration.py b/tests/server/test_auth_integration.py index 102e3e7c3..2b1317376 100644 --- a/tests/server/test_auth_integration.py +++ b/tests/server/test_auth_integration.py @@ -387,10 +387,11 @@ class TestAuthEndpoints: }, ) error_response = response.json() - # SDK validates client_id before other fields, returning unauthorized_client - # (FastMCP's OAuthProxy transforms this to invalid_client, but this test - # uses the SDK's create_auth_routes directly) - assert error_response["error"] == "unauthorized_client" + # The SDK authenticates the client before validating other fields; a + # missing/failed client authentication returns invalid_client (401). + # `unauthorized_client` is now reserved for an authenticated client + # using a grant type it isn't allowed to use. + assert error_response["error"] == "invalid_client" assert "error_description" in error_response async def test_token_invalid_auth_code( @@ -951,10 +952,12 @@ class TestAuthEndpoints: async def test_client_registration_invalid_grant_type( self, test_client: httpx.AsyncClient ): + # The SDK requires `authorization_code` to be present in grant_types; + # a set that omits it is rejected. (`refresh_token` alone is invalid.) client_metadata = { "redirect_uris": ["https://client.example.com/callback"], "client_name": "Test Client", - "grant_types": ["authorization_code"], + "grant_types": ["refresh_token"], } response = await test_client.post( @@ -967,5 +970,5 @@ class TestAuthEndpoints: assert error_data["error"] == "invalid_client_metadata" assert ( error_data["error_description"] - == "grant_types must be authorization_code and refresh_token" + == "grant_types must include 'authorization_code'" ) diff --git a/tests/server/test_context.py b/tests/server/test_context.py index 9af12b055..142287b3a 100644 --- a/tests/server/test_context.py +++ b/tests/server/test_context.py @@ -1,8 +1,7 @@ -from typing import Any, cast from unittest.mock import MagicMock import pytest -from mcp.types import ModelPreferences +from mcp_types import ModelPreferences from fastmcp.server.context import ( Context, @@ -43,25 +42,30 @@ class TestParseModelPreferences: class TestSessionId: def test_session_id_with_http_headers(self, context): """Test that session_id returns the value from mcp-session-id header.""" - from mcp.server.lowlevel.server import request_ctx - from mcp.shared.context import RequestContext + from fastmcp.server.dependencies import ( + FastMCPRequestContext, + fastmcp_request_ctx, + ) mock_headers = {"mcp-session-id": "test-session-123"} - token = request_ctx.set( - RequestContext( - request_id=0, - meta=None, + token = fastmcp_request_ctx.set( + FastMCPRequestContext( session=MagicMock(wraps={}), - lifespan_context=MagicMock(), + request_id="0", + meta=None, request=MagicMock(headers=mock_headers), + protocol_version="2025-06-18", + close_sse_stream=None, + lifespan_context=MagicMock(), + _srctx=MagicMock(meta=None), ) ) try: assert context.session_id == "test-session-123" finally: - request_ctx.reset(token) + fastmcp_request_ctx.reset(token) def test_session_id_without_http_headers(self, context): """Test that session_id returns a UUID when no HTTP headers are available. @@ -71,16 +75,22 @@ class TestSessionId: """ import uuid - from mcp.server.lowlevel.server import request_ctx - from mcp.shared.context import RequestContext + from fastmcp.server.dependencies import ( + FastMCPRequestContext, + fastmcp_request_ctx, + ) mock_session = MagicMock(wraps={}) - token = request_ctx.set( - RequestContext( - request_id=0, - meta=None, + token = fastmcp_request_ctx.set( + FastMCPRequestContext( session=mock_session, + request_id="0", + meta=None, + request=None, + protocol_version="2025-06-18", + close_sse_stream=None, lifespan_context=MagicMock(), + _srctx=MagicMock(meta=None), ) ) @@ -91,7 +101,7 @@ class TestSessionId: # Should be cached on session assert mock_session._fastmcp_state_prefix == session_id finally: - request_ctx.reset(token) + fastmcp_request_ctx.reset(token) class TestContextState: @@ -337,56 +347,67 @@ class TestContextMeta: """Test suite for Context meta functionality.""" def test_request_context_meta_access(self, context): - """Test that meta can be accessed from request context.""" - from mcp.server.lowlevel.server import request_ctx - from mcp.shared.context import RequestContext + """Test that the lifted _meta dict is accessible from request context. - # Create a mock meta object with attributes - class MockMeta: - def __init__(self): - self.user_id = "user-123" - self.trace_id = "trace-456" - self.custom_field = "custom-value" + In the v2 SDK port the wrapper's ``meta`` is the raw ``_meta`` block + lifted from the request params (a dict), not a typed object. + """ + from fastmcp.server.dependencies import ( + FastMCPRequestContext, + fastmcp_request_ctx, + ) - mock_meta = MockMeta() + meta_dict = { + "user_id": "user-123", + "trace_id": "trace-456", + "custom_field": "custom-value", + } - token = request_ctx.set( - RequestContext( - request_id=0, - meta=cast(Any, mock_meta), # Mock object for testing + token = fastmcp_request_ctx.set( + FastMCPRequestContext( session=MagicMock(wraps={}), + request_id="0", + meta=meta_dict, + request=None, + protocol_version="2025-06-18", + close_sse_stream=None, lifespan_context=MagicMock(), + _srctx=MagicMock(meta=None), ) ) - # Access meta through context retrieved_meta = context.request_context.meta assert retrieved_meta is not None - assert retrieved_meta.user_id == "user-123" - assert retrieved_meta.trace_id == "trace-456" - assert retrieved_meta.custom_field == "custom-value" + assert retrieved_meta["user_id"] == "user-123" + assert retrieved_meta["trace_id"] == "trace-456" + assert retrieved_meta["custom_field"] == "custom-value" - request_ctx.reset(token) + fastmcp_request_ctx.reset(token) def test_request_context_meta_none(self, context): """Test that context handles None meta gracefully.""" - from mcp.server.lowlevel.server import request_ctx - from mcp.shared.context import RequestContext + from fastmcp.server.dependencies import ( + FastMCPRequestContext, + fastmcp_request_ctx, + ) - token = request_ctx.set( - RequestContext( - request_id=0, - meta=None, + token = fastmcp_request_ctx.set( + FastMCPRequestContext( session=MagicMock(wraps={}), + request_id="0", + meta=None, + request=None, + protocol_version="2025-06-18", + close_sse_stream=None, lifespan_context=MagicMock(), + _srctx=MagicMock(meta=None), ) ) - # Access meta through context retrieved_meta = context.request_context.meta assert retrieved_meta is None - request_ctx.reset(token) + fastmcp_request_ctx.reset(token) class TestTransport: diff --git a/tests/server/test_dependencies.py b/tests/server/test_dependencies.py index e43672376..8555551a0 100644 --- a/tests/server/test_dependencies.py +++ b/tests/server/test_dependencies.py @@ -2,14 +2,14 @@ from contextlib import asynccontextmanager, contextmanager -import mcp.types as mcp_types import pytest -from mcp.types import TextContent, TextResourceContents +from mcp_types import TextContent, TextResourceContents from fastmcp import FastMCP from fastmcp.client import Client from fastmcp.dependencies import CurrentContext, Depends, Shared from fastmcp.server.context import Context +from tests.conftest import make_server_request_context HUZZAH = "huzzah!" @@ -136,13 +136,13 @@ async def test_dependencies_excluded_from_schema(mcp: FastMCP): ) -> str: return f"{name} is {age} years old" - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) tool = next(t for t in result.tools if t.name == "my_tool") - assert "name" in tool.inputSchema["properties"] - assert "age" in tool.inputSchema["properties"] - assert "config" not in tool.inputSchema["properties"] - assert len(tool.inputSchema["properties"]) == 2 + assert "name" in tool.input_schema["properties"] + assert "age" in tool.input_schema["properties"] + assert "config" not in tool.input_schema["properties"] + assert len(tool.input_schema["properties"]) == 2 async def test_current_context_dependency(mcp: FastMCP): @@ -468,11 +468,11 @@ async def test_connection_dependency_excluded_from_tool_schema(mcp: FastMCP): ) -> str: return name - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) tool = next(t for t in result.tools if t.name == "with_connection") - assert "name" in tool.inputSchema["properties"] - assert "connection" not in tool.inputSchema["properties"] + assert "name" in tool.input_schema["properties"] + assert "connection" not in tool.input_schema["properties"] async def test_sync_tool_context_manager_stays_open(mcp: FastMCP): @@ -590,9 +590,9 @@ async def test_external_user_cannot_override_dependency(mcp: FastMCP): return f"action={action},admin={admin}" # Verify dependency is NOT in the schema - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) tool = next(t for t in result.tools if t.name == "check_permission") - assert "admin" not in tool.inputSchema["properties"] + assert "admin" not in tool.input_schema["properties"] # Normal call - dependency is resolved result = await mcp.call_tool("check_permission", {"action": "read"}) @@ -964,7 +964,6 @@ class TestAuthDependencies: async def test_current_access_token_excluded_from_tool_schema(self, mcp: FastMCP): """Test that CurrentAccessToken dependency is excluded from tool schema.""" - import mcp.types as mcp_types from fastmcp.server.auth import AccessToken from fastmcp.server.dependencies import CurrentAccessToken @@ -976,15 +975,14 @@ class TestAuthDependencies: ) -> str: return name - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) tool = next(t for t in result.tools if t.name == "tool_with_token") - assert "name" in tool.inputSchema["properties"] - assert "token" not in tool.inputSchema["properties"] + assert "name" in tool.input_schema["properties"] + assert "token" not in tool.input_schema["properties"] async def test_token_claim_excluded_from_tool_schema(self, mcp: FastMCP): """Test that TokenClaim dependency is excluded from tool schema.""" - import mcp.types as mcp_types from fastmcp.server.dependencies import TokenClaim @@ -995,11 +993,11 @@ class TestAuthDependencies: ) -> str: return name - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) tool = next(t for t in result.tools if t.name == "tool_with_claim") - assert "name" in tool.inputSchema["properties"] - assert "user_id" not in tool.inputSchema["properties"] + assert "name" in tool.input_schema["properties"] + assert "user_id" not in tool.input_schema["properties"] def test_current_access_token_exported_from_all(self): """Test that CurrentAccessToken is exported from __all__.""" @@ -1140,11 +1138,11 @@ class TestSharedDependencies: async def my_tool(name: str, db: str = Shared(get_db)) -> str: return name - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) tool = next(t for t in result.tools if t.name == "my_tool") - assert "name" in tool.inputSchema["properties"] - assert "db" not in tool.inputSchema["properties"] + assert "name" in tool.input_schema["properties"] + assert "db" not in tool.input_schema["properties"] async def test_shared_in_resource(self, mcp: FastMCP): """Shared dependencies work in resource functions.""" diff --git a/tests/server/test_dependencies_advanced.py b/tests/server/test_dependencies_advanced.py index 19bbb9b87..0657aaddc 100644 --- a/tests/server/test_dependencies_advanced.py +++ b/tests/server/test_dependencies_advanced.py @@ -2,13 +2,13 @@ import inspect -import mcp.types as mcp_types import pytest from fastmcp import FastMCP from fastmcp.client import Client from fastmcp.dependencies import CurrentContext from fastmcp.server.context import Context +from tests.conftest import make_server_request_context class Connection: @@ -170,11 +170,11 @@ class TestTransformContextAnnotations: return f"same={ctx1 is ctx2}" # Both ctx params should be excluded from schema - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) tool = next(t for t in result.tools if t.name == "tool_with_multiple_ctx") - assert "name" in tool.inputSchema["properties"] - assert "ctx1" not in tool.inputSchema["properties"] - assert "ctx2" not in tool.inputSchema["properties"] + assert "name" in tool.input_schema["properties"] + assert "ctx1" not in tool.input_schema["properties"] + assert "ctx2" not in tool.input_schema["properties"] async def test_context_in_class_method(self, mcp: FastMCP): """Test Context transformation works with bound methods.""" diff --git a/tests/server/test_event_store.py b/tests/server/test_event_store.py index 41eb18206..edb00b5e8 100644 --- a/tests/server/test_event_store.py +++ b/tests/server/test_event_store.py @@ -2,7 +2,7 @@ import pytest from mcp.server.streamable_http import EventMessage -from mcp.types import JSONRPCMessage, JSONRPCRequest +from mcp_types import JSONRPCRequest from fastmcp.server.event_store import ( EventEntry, @@ -50,7 +50,7 @@ class TestEventStore: @pytest.fixture def sample_message(self): - return JSONRPCMessage(root=JSONRPCRequest(jsonrpc="2.0", method="test", id=1)) + return JSONRPCRequest(jsonrpc="2.0", method="test", id=1) async def test_store_event_returns_event_id(self, event_store, sample_message): event_id = await event_store.store_event("stream-1", sample_message) @@ -89,7 +89,7 @@ class TestEventStore: assert stream_id == "stream-1" assert len(replayed_events) == 1 assert replayed_events[0].event_id == second_event_id - replayed_message = replayed_events[0].message.root + replayed_message = replayed_events[0].message assert isinstance(replayed_message, JSONRPCRequest) assert replayed_message.method == "test" @@ -99,9 +99,7 @@ class TestEventStore: priming_id = await event_store.store_event("stream-1", None) # Store a real event - real_message = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="test", id=1) - ) + real_message = JSONRPCRequest(jsonrpc="2.0", method="test", id=1) await event_store.store_event("stream-1", real_message) # Replay after priming event @@ -130,9 +128,7 @@ class TestEventStore: # Store more events than the limit event_ids = [] for i in range(7): - msg = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method=f"test-{i}", id=i) - ) + msg = JSONRPCRequest(jsonrpc="2.0", method=f"test-{i}", id=i) event_id = await event_store.store_event("stream-1", msg) event_ids.append(event_id) @@ -152,12 +148,8 @@ class TestEventStore: async def test_multiple_streams_are_isolated(self, event_store): """Events from different streams should not interfere with each other.""" - msg1 = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="stream1-test", id=1) - ) - msg2 = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="stream2-test", id=2) - ) + msg1 = JSONRPCRequest(jsonrpc="2.0", method="stream1-test", id=1) + msg2 = JSONRPCRequest(jsonrpc="2.0", method="stream2-test", id=2) stream1_event = await event_store.store_event("stream-1", msg1) await event_store.store_event("stream-1", msg1) @@ -191,15 +183,9 @@ class TestEventStore: ): session_a_store = SessionScopedEventStore(event_store, "session-a") session_b_store = SessionScopedEventStore(event_store, "session-b") - msg_a1 = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="session-a-1", id=1) - ) - msg_a2 = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="session-a-2", id=2) - ) - msg_b = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="session-b", id=3) - ) + msg_a1 = JSONRPCRequest(jsonrpc="2.0", method="session-a-1", id=1) + msg_a2 = JSONRPCRequest(jsonrpc="2.0", method="session-a-2", id=2) + msg_b = JSONRPCRequest(jsonrpc="2.0", method="session-b", id=3) session_a_event = await session_a_store.store_event(stream_id, msg_a1) await session_b_store.store_event(stream_id, msg_b) @@ -216,7 +202,7 @@ class TestEventStore: assert replayed_stream_id == stream_id assert [event.event_id for event in replayed_events] == [session_a_second_event] - replayed_message = replayed_events[0].message.root + replayed_message = replayed_events[0].message assert isinstance(replayed_message, JSONRPCRequest) assert replayed_message.method == "session-a-2" @@ -225,12 +211,8 @@ class TestEventStore: ): session_a_store = SessionScopedEventStore(event_store, "session-a") session_b_store = SessionScopedEventStore(event_store, "session-b") - msg_b1 = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="session-b-1", id=1) - ) - msg_b2 = JSONRPCMessage( - root=JSONRPCRequest(jsonrpc="2.0", method="session-b-2", id=2) - ) + msg_b1 = JSONRPCRequest(jsonrpc="2.0", method="session-b-1", id=1) + msg_b2 = JSONRPCRequest(jsonrpc="2.0", method="session-b-2", id=2) foreign_event_id = await session_b_store.store_event("_GET_stream", msg_b1) await session_b_store.store_event("_GET_stream", msg_b2) @@ -262,7 +244,7 @@ class TestEventStore: async def test_default_storage_is_memory(self): """Test that EventStore defaults to in-memory storage.""" event_store = EventStore() - msg = JSONRPCMessage(root=JSONRPCRequest(jsonrpc="2.0", method="test", id=1)) + msg = JSONRPCRequest(jsonrpc="2.0", method="test", id=1) event_id = await event_store.store_event("stream-1", msg) assert event_id is not None @@ -285,26 +267,22 @@ class TestEventStoreIntegration: event_store = EventStore() # Create a realistic JSON-RPC request wrapped in JSONRPCMessage - original_msg = JSONRPCMessage( - root=JSONRPCRequest( - jsonrpc="2.0", - method="tools/call", - id="request-123", - params={"name": "my_tool", "arguments": {"x": 1, "y": 2}}, - ) + original_msg = JSONRPCRequest( + jsonrpc="2.0", + method="tools/call", + id="request-123", + params={"name": "my_tool", "arguments": {"x": 1, "y": 2}}, ) # Store it event_id = await event_store.store_event("stream-1", original_msg) # Store another event so we have something to replay - second_msg = JSONRPCMessage( - root=JSONRPCRequest( - jsonrpc="2.0", - method="tools/call", - id="request-456", - params={"name": "my_tool", "arguments": {"x": 3, "y": 4}}, - ) + second_msg = JSONRPCRequest( + jsonrpc="2.0", + method="tools/call", + id="request-456", + params={"name": "my_tool", "arguments": {"x": 3, "y": 4}}, ) await event_store.store_event("stream-1", second_msg) @@ -318,6 +296,6 @@ class TestEventStoreIntegration: assert len(replayed) == 1 assert replayed[0].event_id is not None - assert isinstance(replayed[0].message.root, JSONRPCRequest) - assert replayed[0].message.root.method == "tools/call" - assert replayed[0].message.root.id == "request-456" + assert isinstance(replayed[0].message, JSONRPCRequest) + assert replayed[0].message.method == "tools/call" + assert replayed[0].message.id == "request-456" diff --git a/tests/server/test_file_server.py b/tests/server/test_file_server.py index 9bda34c10..f8b86adf3 100644 --- a/tests/server/test_file_server.py +++ b/tests/server/test_file_server.py @@ -1,10 +1,11 @@ from pathlib import Path -import mcp.types as mcp_types +import mcp_types import pytest from fastmcp import FastMCP from fastmcp.resources import ResourceContent, ResourceResult +from tests.conftest import make_server_request_context @pytest.fixture() @@ -76,7 +77,7 @@ def tools(mcp: FastMCP, test_dir: Path) -> FastMCP: async def test_list_resources(mcp: FastMCP): - result = await mcp._list_resources_mcp(mcp_types.ListResourcesRequest()) + result = await mcp._on_list_resources(make_server_request_context(), None) assert len(result.resources) == 4 assert [str(r.uri) for r in result.resources] == [ @@ -88,7 +89,10 @@ async def test_list_resources(mcp: FastMCP): async def test_read_resource_dir(mcp: FastMCP): - res_result = await mcp._read_resource_mcp("dir://test_dir") + res_result = await mcp._on_read_resource( + make_server_request_context(), + mcp_types.ReadResourceRequestParams(uri="dir://test_dir"), + ) assert isinstance(res_result, mcp_types.ReadResourceResult) # ResourceResult splits lists into multiple contents (one per file path) assert len(res_result.contents) == 3 @@ -107,7 +111,10 @@ async def test_read_resource_dir(mcp: FastMCP): async def test_read_resource_file(mcp: FastMCP): - res_result = await mcp._read_resource_mcp("file://test_dir/example.py") + res_result = await mcp._on_read_resource( + make_server_request_context(), + mcp_types.ReadResourceRequestParams(uri="file://test_dir/example.py"), + ) assert isinstance(res_result, mcp_types.ReadResourceResult) assert len(res_result.contents) == 1 res = res_result.contents[0] @@ -116,17 +123,26 @@ async def test_read_resource_file(mcp: FastMCP): async def test_delete_file(mcp: FastMCP, test_dir: Path): - await mcp._call_tool_mcp( - "delete_file", arguments=dict(path=str(test_dir / "example.py")) + await mcp._on_call_tool( + make_server_request_context(), + mcp_types.CallToolRequestParams( + name="delete_file", arguments=dict(path=str(test_dir / "example.py")) + ), ) assert not (test_dir / "example.py").exists() async def test_delete_file_and_check_resources(mcp: FastMCP, test_dir: Path): - await mcp._call_tool_mcp( - "delete_file", arguments=dict(path=str(test_dir / "example.py")) + await mcp._on_call_tool( + make_server_request_context(), + mcp_types.CallToolRequestParams( + name="delete_file", arguments=dict(path=str(test_dir / "example.py")) + ), + ) + res_result = await mcp._on_read_resource( + make_server_request_context(), + mcp_types.ReadResourceRequestParams(uri="file://test_dir/example.py"), ) - res_result = await mcp._read_resource_mcp("file://test_dir/example.py") assert isinstance(res_result, mcp_types.ReadResourceResult) assert len(res_result.contents) == 1 res = res_result.contents[0] diff --git a/tests/server/test_icons.py b/tests/server/test_icons.py index a937728fa..9fba37b9b 100644 --- a/tests/server/test_icons.py +++ b/tests/server/test_icons.py @@ -1,6 +1,6 @@ """Tests for icon support across all MCP object types.""" -from mcp.types import Icon +from mcp_types import Icon from fastmcp import Client, FastMCP from fastmcp.prompts import Message, Prompt @@ -17,12 +17,12 @@ class TestServerIcons: icons = [ Icon( src="https://example.com/icon.png", - mimeType="image/png", + mime_type="image/png", sizes=["48x48"], ), Icon( src="data:image/svg+xml;base64,PHN2Zz48L3N2Zz4=", - mimeType="image/svg+xml", + mime_type="image/svg+xml", sizes=["any"], ), ] @@ -36,8 +36,8 @@ class TestServerIcons: # Verify that icons and website_url are passed to the underlying server async with Client(mcp) as client: - server_info = client.initialize_result.serverInfo - assert server_info.websiteUrl == "https://example.com" + server_info = client.initialize_result.server_info + assert server_info.website_url == "https://example.com" assert server_info.icons == icons async def test_server_without_icons_and_website_url(self): @@ -45,8 +45,8 @@ class TestServerIcons: mcp = FastMCP(name="TestServer") async with Client(mcp) as client: - server_info = client.initialize_result.serverInfo - assert server_info.websiteUrl is None + server_info = client.initialize_result.server_info + assert server_info.website_url is None assert server_info.icons is None @@ -58,7 +58,7 @@ class TestToolIcons: mcp = FastMCP("TestServer") icons = [ - Icon(src="https://example.com/tool-icon.png", mimeType="image/png"), + Icon(src="https://example.com/tool-icon.png", mime_type="image/png"), ] @mcp.tool(icons=icons) @@ -272,17 +272,17 @@ class TestIconTypes: icons = [ Icon( src="https://example.com/icon-48.png", - mimeType="image/png", + mime_type="image/png", sizes=["48x48"], ), Icon( src="https://example.com/icon-96.png", - mimeType="image/png", + mime_type="image/png", sizes=["96x96"], ), Icon( src="https://example.com/icon.svg", - mimeType="image/svg+xml", + mime_type="image/svg+xml", sizes=["any"], ), ] @@ -290,7 +290,7 @@ class TestIconTypes: mcp = FastMCP("TestServer", icons=icons) async with Client(mcp) as client: - server_info = client.initialize_result.serverInfo + server_info = client.initialize_result.server_info assert len(server_info.icons) == 3 assert server_info.icons == icons @@ -299,7 +299,7 @@ class TestIconTypes: # Simple SVG data URI data_uri = "data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCI+PHBhdGggZD0iTTEyIDJDNi40OCAyIDIgNi40OCAyIDEyczQuNDggMTAgMTAgMTAgMTAtNC40OCAxMC0xMFMxNy41MiAyIDEyIDJ6Ii8+PC9zdmc+" - icons = [Icon(src=data_uri, mimeType="image/svg+xml")] + icons = [Icon(src=data_uri, mime_type="image/svg+xml")] mcp = FastMCP("TestServer") @@ -319,14 +319,14 @@ class TestIconTypes: mcp = FastMCP("TestServer", icons=icons) async with Client(mcp) as client: - server_info = client.initialize_result.serverInfo + server_info = client.initialize_result.server_info assert server_info.icons[0].src == "https://example.com/icon.png" - assert server_info.icons[0].mimeType is None + assert server_info.icons[0].mime_type is None assert server_info.icons[0].sizes is None class TestIconImport: - """Test that Icon must be imported from mcp.types.""" + """Test that Icon must be imported from mcp_types.""" def test_icon_import(self): """Test that Icon must be imported from mcp.types, not fastmcp.""" @@ -336,7 +336,7 @@ class TestIconImport: assert not hasattr(fastmcp, "Icon") # Icon should be imported from mcp.types - from mcp.types import Icon as MCPIcon + from mcp_types import Icon as MCPIcon icon = MCPIcon(src="https://example.com/icon.png") assert icon.src == "https://example.com/icon.png" diff --git a/tests/server/test_input_validation.py b/tests/server/test_input_validation.py index 264e2bd70..777574d47 100644 --- a/tests/server/test_input_validation.py +++ b/tests/server/test_input_validation.py @@ -9,7 +9,7 @@ strict_input_validation=False, the default). import json import pytest -from mcp.types import TextContent +from mcp_types import TextContent from pydantic import BaseModel from fastmcp import Client, FastMCP diff --git a/tests/server/test_pagination.py b/tests/server/test_pagination.py index f28fabe1b..89d3ec79e 100644 --- a/tests/server/test_pagination.py +++ b/tests/server/test_pagination.py @@ -4,9 +4,9 @@ from __future__ import annotations from unittest.mock import patch -import mcp.types +import mcp_types import pytest -from mcp.shared.exceptions import McpError +from mcp.shared.exceptions import MCPError from fastmcp import Client, FastMCP from fastmcp.utilities.pagination import CursorState, paginate_sequence @@ -166,17 +166,17 @@ class TestServerPagination: # First page result = await client.list_tools_mcp() assert len(result.tools) == 10 - assert result.nextCursor is not None + assert result.next_cursor is not None # Second page - result2 = await client.list_tools_mcp(cursor=result.nextCursor) + result2 = await client.list_tools_mcp(cursor=result.next_cursor) assert len(result2.tools) == 10 - assert result2.nextCursor is not None + assert result2.next_cursor is not None # Third (last) page - result3 = await client.list_tools_mcp(cursor=result2.nextCursor) + result3 = await client.list_tools_mcp(cursor=result2.next_cursor) assert len(result3.tools) == 5 - assert result3.nextCursor is None + assert result3.next_cursor is None async def test_invalid_cursor_returns_error(self) -> None: """Server should return MCP error for invalid cursor.""" @@ -187,7 +187,7 @@ class TestServerPagination: return "ok" async with Client(server) as client: - with pytest.raises(McpError) as exc: + with pytest.raises(MCPError) as exc: await client.list_tools_mcp(cursor="invalid!") assert exc.value.error.code == -32602 @@ -204,7 +204,7 @@ class TestServerPagination: async with Client(server) as client: result = await client.list_tools_mcp() assert len(result.tools) == 25 - assert result.nextCursor is None + assert result.next_cursor is None async def test_pagination_exact_page_boundary(self) -> None: """Test pagination at exact page boundaries.""" @@ -220,12 +220,12 @@ class TestServerPagination: # First page result = await client.list_tools_mcp() assert len(result.tools) == 10 - assert result.nextCursor is not None + assert result.next_cursor is not None # Second (last) page - result2 = await client.list_tools_mcp(cursor=result.nextCursor) + result2 = await client.list_tools_mcp(cursor=result.next_cursor) assert len(result2.tools) == 10 - assert result2.nextCursor is None + assert result2.next_cursor is None class TestPageSizeValidation: @@ -263,9 +263,9 @@ class TestPaginationCycleDetection: async def returning_constant_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListToolsResult: + ) -> mcp_types.ListToolsResult: result = await original(cursor=cursor) - result.nextCursor = "stuck" + result.next_cursor = "stuck" return result with patch.object( @@ -292,9 +292,9 @@ class TestPaginationCycleDetection: async def returning_constant_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListPromptsResult: + ) -> mcp_types.ListPromptsResult: result = await original(cursor=cursor) - result.nextCursor = "stuck" + result.next_cursor = "stuck" return result with patch.object( @@ -319,9 +319,9 @@ class TestPaginationCycleDetection: async def returning_constant_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListResourcesResult: + ) -> mcp_types.ListResourcesResult: result = await original(cursor=cursor) - result.nextCursor = "stuck" + result.next_cursor = "stuck" return result with patch.object( @@ -346,9 +346,9 @@ class TestPaginationCycleDetection: async def returning_constant_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListResourceTemplatesResult: + ) -> mcp_types.ListResourceTemplatesResult: result = await original(cursor=cursor) - result.nextCursor = "stuck" + result.next_cursor = "stuck" return result with patch.object( @@ -375,12 +375,12 @@ class TestPaginationCycleDetection: async def returning_cycling_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListToolsResult: + ) -> mcp_types.ListToolsResult: nonlocal call_count result = await original(cursor=cursor) # Cycle through A -> B -> C -> A cursors = ["A", "B", "C"] - result.nextCursor = cursors[call_count % 3] + result.next_cursor = cursors[call_count % 3] call_count += 1 return result @@ -407,9 +407,9 @@ class TestPaginationCycleDetection: async def returning_empty_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListToolsResult: + ) -> mcp_types.ListToolsResult: result = await original(cursor=cursor) - result.nextCursor = "" + result.next_cursor = "" return result with patch.object( @@ -435,11 +435,11 @@ class TestPaginationCycleDetection: async def returning_unique_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListToolsResult: + ) -> mcp_types.ListToolsResult: nonlocal call_count result = await original(cursor=cursor) call_count += 1 - result.nextCursor = f"cursor-{call_count}" + result.next_cursor = f"cursor-{call_count}" return result with ( @@ -465,11 +465,11 @@ class TestPaginationCycleDetection: async def returning_unique_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListResourcesResult: + ) -> mcp_types.ListResourcesResult: nonlocal call_count result = await original(cursor=cursor) call_count += 1 - result.nextCursor = f"cursor-{call_count}" + result.next_cursor = f"cursor-{call_count}" return result with ( @@ -495,11 +495,11 @@ class TestPaginationCycleDetection: async def returning_unique_cursor( *, cursor: str | None = None, - ) -> mcp.types.ListPromptsResult: + ) -> mcp_types.ListPromptsResult: nonlocal call_count result = await original(cursor=cursor) call_count += 1 - result.nextCursor = f"cursor-{call_count}" + result.next_cursor = f"cursor-{call_count}" return result with ( diff --git a/tests/server/test_protocol_eras.py b/tests/server/test_protocol_eras.py new file mode 100644 index 000000000..ac56cc960 --- /dev/null +++ b/tests/server/test_protocol_eras.py @@ -0,0 +1,556 @@ +"""Dual-era protocol matrix: one FastMCP server served over both MCP protocol eras. + +FastMCP must serve the legacy (initialize-handshake, 2025-11-25) era and the +modern (server/discover, 2026-07-28) era from the same server object. The test +harness is the v2 SDK's own first-class client, ``mcp.client.Client``, which +resolves an in-process ``Server`` directly: + +* ``mode='legacy'`` forces the initialize handshake (2025-11-25 in-memory). +* ``mode='auto'`` probes ``server/discover`` and negotiates 2026-07-28. +* ``mode='2026-07-28'`` pins the modern version and adopts a synthesized + ``DiscoverResult`` (no probe). + +A FastMCP server exposes its lowlevel ``Server`` as ``fastmcp_server._mcp_server``; +that is what we hand to the SDK client, mirroring how +``mcp.client._memory.InMemoryTransport`` unwraps servers. + +Several cells characterize behavior that is a verified SDK-era contract rather +than a FastMCP choice; those are flagged inline and cross-referenced to the +migration feedback dossier (``<scratchpad>/specs/sdk-feedback.md``). +""" + +from __future__ import annotations + +import mcp_types as types +import pytest +from mcp.client import Client as SDKClient +from mcp.client.session import ClientRequestContext +from mcp.server import Server as LowLevelServer +from mcp.shared.exceptions import MCPError +from mcp_types import methods +from mcp_types.version import ( + HANDSHAKE_PROTOCOL_VERSIONS, + MODERN_PROTOCOL_VERSIONS, +) +from pydantic import FileUrl + +from fastmcp import Client as FastMCPClient +from fastmcp import Context, FastMCP +from fastmcp.server.elicitation import AcceptedElicitation +from fastmcp.server.middleware import Middleware + +# Modes that reach the modern (2026-07-28) era via the SDK client. +MODERN_MODES = ["auto", "2026-07-28"] +# Both eras, for cells that must produce identical semantics on each. +ALL_MODES = ["legacy", *MODERN_MODES] + + +@pytest.fixture +def dual_era_server() -> FastMCP: + """A single FastMCP server exercising every core MCP object type. + + Deliberately minimal and side-effect free so the same instance can be + driven concurrently by legacy and modern clients within one test. + """ + mcp = FastMCP("dual-era") + + @mcp.tool + def add(a: int, b: int) -> int: + """Structured-output tool (returns a scalar wrapped as {"result": ...}).""" + return a + b + + @mcp.resource("data://config") + def config() -> dict: + return {"version": 1} + + @mcp.resource("data://item/{item_id}") + def item(item_id: str) -> str: + return f"item-{item_id}" + + @mcp.prompt + def summarize(topic: str) -> str: + return f"Summarize {topic}" + + return mcp + + +def _server(mcp: FastMCP) -> LowLevelServer: + """The lowlevel Server the SDK client connects to in-process.""" + return mcp._mcp_server + + +def _texts(blocks) -> list[str]: + """Text from CallToolResult.content blocks (TextContent).""" + return [b.text for b in blocks if isinstance(b, types.TextContent)] + + +def _resource_texts(blocks) -> list[str]: + """Text from ReadResourceResult.contents blocks (TextResourceContents).""" + return [b.text for b in blocks if isinstance(b, types.TextResourceContents)] + + +# --------------------------------------------------------------------------- +# 1. Core operations produce identical semantics on BOTH eras +# --------------------------------------------------------------------------- + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_list_tools_both_eras(dual_era_server, mode): + async with SDKClient(_server(dual_era_server), mode=mode) as client: + result = await client.list_tools() + assert [t.name for t in result.tools] == ["add"] + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_call_tool_structured_output_both_eras(dual_era_server, mode): + async with SDKClient(_server(dual_era_server), mode=mode) as client: + result = await client.call_tool("add", {"a": 2, "b": 3}) + assert result.is_error is False + assert result.structured_content == {"result": 5} + assert _texts(result.content) == ["5"] + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_list_resources_both_eras(dual_era_server, mode): + async with SDKClient(_server(dual_era_server), mode=mode) as client: + result = await client.list_resources() + assert [str(r.uri) for r in result.resources] == ["data://config"] + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_read_resource_both_eras(dual_era_server, mode): + async with SDKClient(_server(dual_era_server), mode=mode) as client: + result = await client.read_resource("data://config") + assert _resource_texts(result.contents) == ['{"version": 1}'] + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_read_resource_template_both_eras(dual_era_server, mode): + async with SDKClient(_server(dual_era_server), mode=mode) as client: + result = await client.read_resource("data://item/42") + assert _resource_texts(result.contents) == ["item-42"] + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_list_prompts_both_eras(dual_era_server, mode): + async with SDKClient(_server(dual_era_server), mode=mode) as client: + result = await client.list_prompts() + assert [p.name for p in result.prompts] == ["summarize"] + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_get_prompt_both_eras(dual_era_server, mode): + async with SDKClient(_server(dual_era_server), mode=mode) as client: + result = await client.get_prompt("summarize", {"topic": "cats"}) + rendered = [ + m.content.text + for m in result.messages + if isinstance(m.content, types.TextContent) + ] + assert rendered == ["Summarize cats"] + + +@pytest.mark.parametrize("mode", ALL_MODES) +async def test_complete_parity_both_eras(dual_era_server, mode): + """FastMCP registers no completion handler, so `completion/complete` is + method-not-found. The point of this cell is parity: the *same* -32601 + surfaces on both eras (2026 did not change the unsupported-method contract). + """ + async with SDKClient(_server(dual_era_server), mode=mode) as client: + with pytest.raises(MCPError) as excinfo: + await client.complete( + types.PromptReference(name="summarize"), + {"name": "topic", "value": "c"}, + ) + assert excinfo.value.code == types.METHOD_NOT_FOUND + + +# --------------------------------------------------------------------------- +# 2. Discovery / identity: which negotiation path each mode takes +# --------------------------------------------------------------------------- + + +async def test_legacy_uses_initialize_handshake(dual_era_server): + """Legacy mode runs the initialize handshake and reports a handshake-era + protocol version with server_info carried in the InitializeResult. + """ + async with SDKClient(_server(dual_era_server), mode="legacy") as client: + assert client.protocol_version == "2025-11-25" + assert client.server_info.name == "dual-era" + + +async def test_auto_negotiates_modern_via_discover(dual_era_server): + """`mode='auto'` probes server/discover and adopts 2026-07-28, populating + server_info/capabilities from the DiscoverResult. + """ + async with SDKClient(_server(dual_era_server), mode="auto") as client: + assert client.protocol_version == "2026-07-28" + # server/discover carries identity, unlike the synthesized pin below. + assert client.server_info.name == "dual-era" + assert client.server_capabilities is not None + + +async def test_pinned_modern_adopts_without_probe(dual_era_server): + """Pinning `mode='2026-07-28'` adopts the version directly. With no + `prior_discover`, the SDK synthesizes a minimal DiscoverResult, so + server_info is empty even though the protocol version is modern. + + Characterization of the SDK's synthesize-discover path (mcp.client.client + `_synthesize_discover`): a pin without prior_discover trades identity for + skipping the probe round-trip. + """ + async with SDKClient(_server(dual_era_server), mode="2026-07-28") as client: + assert client.protocol_version == "2026-07-28" + assert client.server_info.name == "" + + +# --------------------------------------------------------------------------- +# 3. Push-feature degradation on 2026 vs. working callbacks on legacy +# --------------------------------------------------------------------------- + + +@pytest.fixture +def push_server() -> FastMCP: + mcp = FastMCP("push") + + @mcp.tool + async def do_elicit(ctx: Context) -> str: + result = await ctx.elicit("pick a value", response_type=int) + assert isinstance(result, AcceptedElicitation) + return f"elicited {result.data}" + + @mcp.tool + async def do_sample(ctx: Context) -> str: + result = await ctx.sample("hello") + return f"sampled {result.text}" + + @mcp.tool + async def do_list_roots(ctx: Context) -> str: + roots = await ctx.list_roots() + return f"roots {[str(r.uri) for r in roots]}" + + @mcp.tool + async def do_log(ctx: Context) -> str: + await ctx.info("a log line") + return "logged" + + return mcp + + +async def _accept_elicit( + context: ClientRequestContext, params: types.ElicitRequestParams +) -> types.ElicitResult: + return types.ElicitResult(action="accept", content={"value": 7}) + + +async def _sampling_cb( + context: ClientRequestContext, params: types.CreateMessageRequestParams +) -> types.CreateMessageResult: + return types.CreateMessageResult( + role="assistant", + content=types.TextContent(type="text", text="sampled-text"), + model="test-model", + ) + + +async def _roots_cb(context: ClientRequestContext) -> types.ListRootsResult: + return types.ListRootsResult( + roots=[types.Root(uri=FileUrl("file:///tmp"), name="tmp")] + ) + + +async def test_elicit_works_on_legacy(push_server): + async with SDKClient( + _server(push_server), mode="legacy", elicitation_callback=_accept_elicit + ) as client: + result = await client.call_tool("do_elicit", {}) + assert result.is_error is False + assert _texts(result.content) == ["elicited 7"] + + +async def test_sample_works_on_legacy(push_server): + async with SDKClient( + _server(push_server), mode="legacy", sampling_callback=_sampling_cb + ) as client: + result = await client.call_tool("do_sample", {}) + assert result.is_error is False + assert _texts(result.content) == ["sampled sampled-text"] + + +async def test_list_roots_works_on_legacy(push_server): + async with SDKClient( + _server(push_server), mode="legacy", list_roots_callback=_roots_cb + ) as client: + result = await client.call_tool("do_list_roots", {}) + assert result.is_error is False + assert _texts(result.content) == ["roots ['file:///tmp']"] + + +@pytest.mark.parametrize("mode", MODERN_MODES) +@pytest.mark.parametrize("tool", ["do_elicit", "do_sample", "do_list_roots"]) +async def test_push_features_degrade_on_modern(push_server, mode, tool): + """Server-initiated requests (elicitation/sampling/roots) are removed at + 2026-07-28 (SEP-2577), so a tool that uses them must degrade to a surfaced + error rather than hang or crash the connection. This asserts the + degradation happens and reaches the caller as an isError result. + """ + async with SDKClient( + _server(push_server), + mode=mode, + elicitation_callback=_accept_elicit, + sampling_callback=_sampling_cb, + list_roots_callback=_roots_cb, + ) as client: + result = await client.call_tool(tool, {}) + assert result.is_error is True + # A subsequent normal call still works: the connection survived the + # per-request failure rather than tearing down the whole session. + log_result = await client.call_tool("do_log", {}) + assert log_result.is_error is False + + +async def test_list_roots_degradation_message_is_clear_on_modern(push_server): + """`ctx.list_roots()` sends with no related_request_id, so the SDK selects + the connection's no-back-channel outbound and raises the self-explanatory + NoBackChannelError. This is the *good* degradation message and we assert it. + """ + async with SDKClient(_server(push_server), mode="2026-07-28") as client: + result = await client.call_tool("do_list_roots", {}) + assert result.is_error is True + message = " ".join(_texts(result.content)).lower() + assert "back-channel" in message and "server-initiated" in message + + +@pytest.mark.xfail( + strict=True, + reason=( + "sdk-feedback.md #10: elicitation/sampling attach a related_request_id, " + "so at 2026 the request reaches the client _on_request and fails with a " + "bare 'Method not found' KeyError instead of an era-aware " + "NoBackChannelError. list_roots (no related id) already degrades " + "clearly; elicit/sample do not." + ), +) +@pytest.mark.parametrize("tool", ["do_elicit", "do_sample"]) +async def test_elicit_sample_degradation_message_is_clear_on_modern(push_server, tool): + """Characterizes the inconsistency in #10: we WANT elicit/sample to surface + an era-aware message (like list_roots does). Currently they surface a bare + 'Method not found', so this xfails strict until the SDK unifies the path. + """ + async with SDKClient( + _server(push_server), + mode="2026-07-28", + elicitation_callback=_accept_elicit, + sampling_callback=_sampling_cb, + ) as client: + result = await client.call_tool(tool, {}) + assert result.is_error is True + message = " ".join(_texts(result.content)).lower() + assert "back-channel" in message or "server-initiated" in message + + +@pytest.mark.parametrize("mode", MODERN_MODES) +async def test_logging_notification_still_flows_on_modern(push_server, mode): + """`ctx.info` is a server->client *notification*, not a request. Unlike the + removed server-initiated requests, notifications still flow over the modern + direct-dispatcher path, so the tool completes successfully. + + Characterization: current behavior is silent success (the log is emitted, + the tool returns normally); we assert that rather than an error. + """ + async with SDKClient(_server(push_server), mode=mode) as client: + result = await client.call_tool("do_log", {}) + assert result.is_error is False + assert _texts(result.content) == ["logged"] + + +# --------------------------------------------------------------------------- +# 4. Tasks: submission + tasks/get across the eras the _sdk_patches shim covers +# --------------------------------------------------------------------------- + + +@pytest.fixture +def task_server() -> FastMCP: + mcp = FastMCP("tasks") + + @mcp.tool(task=True) + async def slow_add(a: int, b: int) -> int: + return a + b + + return mcp + + +async def test_task_submission_and_get_on_legacy_latest(task_server): + """Legacy-latest (2025-11-25): a task-augmented tools/call returns a + CreateTaskResult and tasks/get resolves it. This exercises the + _sdk_patches registry-widening shim at the 2025-11-25 tools/call surface. + + Driven with the FastMCP client because the v2 SDK client's call_tool has no + `task=` parameter (verified: mcp.client.session.ClientSession.call_tool + exposes no task metadata arg) — see item below. + """ + async with FastMCPClient(task_server) as client: + assert client.initialize_result is not None + assert client.initialize_result.protocol_version == "2025-11-25" + + task = await client.call_tool("slow_add", {"a": 2, "b": 3}, task=True) + assert task.task_id + assert not task.returned_immediately + + await task.wait(timeout=3.0) + result = await task.result() + assert result.data == 5 + + +@pytest.mark.xfail( + strict=True, + reason=( + "The v2 SDK high-level client (mcp.client.Client) and ClientSession " + "expose no `task=` parameter on call_tool, so a task-augmented " + "tools/call cannot be submitted through it at any era; a hand-built " + "raw CallToolRequest does not drive FastMCP's task path either. On " + "2026-07-28 tasks moved to the io.modelcontextprotocol/tasks extension " + "and CreateTaskResult is not part of the tools/call union, so the " + "_sdk_patches shim intentionally does not widen the modern row " + "(sdk-feedback.md #1). Remove once the SDK client supports task " + "submission." + ), +) +async def test_task_submission_on_modern(task_server): + async with SDKClient(_server(task_server), mode="2026-07-28") as client: + params = types.CallToolRequestParams( + name="slow_add", + arguments={"a": 1, "b": 2}, + task=types.TaskMetadata(ttl=60000), + ) + result = await client.session.send_request( + types.CallToolRequest(params=params), types.CreateTaskResult + ) + assert isinstance(result, types.CreateTaskResult) + + +# --------------------------------------------------------------------------- +# 4b. _sdk_patches registry gating: the SEP-1686 task shim widens ONLY the +# handshake-era rows and leaves the 2026-07-28 (extension-era) rows untouched. +# --------------------------------------------------------------------------- + + +def test_task_shim_widens_handshake_tools_call_rows(): + """Every handshake-era tools/call row gains a CreateTaskResult arm.""" + from fastmcp._sdk_patches import get_union_arms + + for version in HANDSHAKE_PROTOCOL_VERSIONS: + row = methods.SERVER_RESULTS[("tools/call", version)] + assert types.CreateTaskResult in get_union_arms(row), version + + +def test_task_shim_does_not_touch_modern_tools_call_row(): + """The 2026-07-28 tools/call row stays the unpatched MRTR union: tasks are + the io.modelcontextprotocol/tasks extension there, so CreateTaskResult must + not be injected.""" + from fastmcp._sdk_patches import get_union_arms + + row = methods.SERVER_RESULTS[("tools/call", "2026-07-28")] + arms = get_union_arms(row) + assert types.CreateTaskResult not in arms + # Unchanged from the SDK default: the 2026 mutually-recursive tool result + # (CallToolResult | InputRequiredResult), keyed by the version-specific types. + arm_names = {arm.__name__ for arm in arms} + assert arm_names == {"CallToolResult", "InputRequiredResult"} + + +@pytest.mark.parametrize( + "task_method", + ["tasks/get", "tasks/result", "tasks/list", "tasks/cancel"], +) +def test_task_shim_registers_tasks_rows_only_for_handshake_eras(task_method): + """tasks/* result rows exist for handshake-era versions and are absent for + the modern (extension) era.""" + for version in HANDSHAKE_PROTOCOL_VERSIONS: + assert (task_method, version) in methods.SERVER_RESULTS, (task_method, version) + for version in MODERN_PROTOCOL_VERSIONS: + assert (task_method, version) not in methods.SERVER_RESULTS, ( + task_method, + version, + ) + + +# --------------------------------------------------------------------------- +# 5. Sessionless safety: session-id-keyed paths must not crash on 2026 in-memory +# --------------------------------------------------------------------------- + + +@pytest.fixture +def sessionless_server() -> FastMCP: + mcp = FastMCP("sessionless") + + @mcp.tool + async def read_session_id(ctx: Context) -> str: + # In-memory/HTTP-less connections have no HTTP session id; FastMCP must + # synthesize a stable one rather than raise. + return ctx.session_id + + return mcp + + +@pytest.mark.parametrize("mode", MODERN_MODES) +async def test_session_id_access_does_not_crash_on_modern(sessionless_server, mode): + async with SDKClient(_server(sessionless_server), mode=mode) as client: + result = await client.call_tool("read_session_id", {}) + assert result.is_error is False + # A non-empty synthesized id was returned. + assert _texts(result.content)[0] + + +@pytest.mark.parametrize("mode", MODERN_MODES) +async def test_set_logging_level_does_not_crash_on_modern(sessionless_server, mode): + """logging/setLevel is a session-id-keyed, deprecated-at-2026 operation. + On a sessionless modern in-memory connection it must degrade cleanly (either + succeed as a no-op or raise a surfaced MCPError) rather than crash the + connection. Characterization: capture whichever the current contract is. + """ + async with SDKClient(_server(sessionless_server), mode=mode) as client: + outcome: str + try: + await client.set_logging_level("debug") # ty: ignore[deprecated] + outcome = "ok" + except MCPError: + outcome = "mcperror" + # Either way the connection is still usable afterward. + result = await client.call_tool("read_session_id", {}) + assert result.is_error is False + assert outcome in {"ok", "mcperror"} + + +# --------------------------------------------------------------------------- +# 6. FastMCP middleware runs on both eras +# --------------------------------------------------------------------------- + + +class _CallToolCounter(Middleware): + def __init__(self) -> None: + super().__init__() + self.count = 0 + + async def on_call_tool(self, context, call_next): + self.count += 1 + return await call_next(context) + + +async def test_middleware_runs_on_both_eras(): + counter = _CallToolCounter() + mcp = FastMCP("mw") + mcp.add_middleware(counter) + + @mcp.tool + def ping() -> str: + return "pong" + + for mode in ("legacy", "2026-07-28"): + async with SDKClient(mcp._mcp_server, mode=mode) as client: + result = await client.call_tool("ping", {}) + assert result.is_error is False + assert _texts(result.content) == ["pong"] + + # One invocation observed from each era. + assert counter.count == 2 diff --git a/tests/server/test_providers.py b/tests/server/test_providers.py index 6f53d4bde..496127244 100644 --- a/tests/server/test_providers.py +++ b/tests/server/test_providers.py @@ -4,7 +4,8 @@ from collections.abc import Sequence from typing import Any import pytest -from mcp.types import AnyUrl, TextContent +from mcp_types import TextContent +from pydantic import AnyUrl from fastmcp import FastMCP from fastmcp.prompts.base import Prompt diff --git a/tests/server/test_server.py b/tests/server/test_server.py index 3d62e7092..83374362d 100644 --- a/tests/server/test_server.py +++ b/tests/server/test_server.py @@ -5,7 +5,7 @@ from tempfile import TemporaryDirectory from textwrap import dedent from unittest import mock -from mcp.types import TextContent, TextResourceContents +from mcp_types import TextContent, TextResourceContents from fastmcp import Client, FastMCP from fastmcp.server.providers import LocalProvider @@ -365,7 +365,7 @@ class TestMeta: async with Client(mcp) as client: templates = await client.list_resource_templates() template = next( - t for t in templates if t.uriTemplate == "test://template/{id}" + t for t in templates if t.uri_template == "test://template/{id}" ) assert template.meta is not None assert set(template.meta["fastmcp"]["tags"]) == { diff --git a/tests/server/test_session_visibility.py b/tests/server/test_session_visibility.py index 887f4f330..d98a0d72f 100644 --- a/tests/server/test_session_visibility.py +++ b/tests/server/test_session_visibility.py @@ -4,7 +4,7 @@ from dataclasses import dataclass, field from datetime import datetime import anyio -import mcp.types +import mcp_types from fastmcp.client.messages import MessageHandler from fastmcp.server.context import Context @@ -16,7 +16,7 @@ class NotificationRecording: """Record of a notification that was received.""" method: str - notification: mcp.types.ServerNotification + notification: mcp_types.ServerNotification timestamp: datetime = field(default_factory=datetime.now) @@ -27,10 +27,11 @@ class RecordingMessageHandler(MessageHandler): super().__init__() self.notifications: list[NotificationRecording] = [] - async def on_notification(self, message: mcp.types.ServerNotification) -> None: + async def on_notification(self, message: mcp_types.ServerNotification) -> None: """Record all notifications with timestamp.""" + # SDK v2 delivers notifications unwrapped (no `.root` wrapper). self.notifications.append( - NotificationRecording(method=message.root.method, notification=message) + NotificationRecording(method=message.method, notification=message) ) def get_notifications( diff --git a/tests/server/test_tool_annotations.py b/tests/server/test_tool_annotations.py index 8a2a925df..096fd451d 100644 --- a/tests/server/test_tool_annotations.py +++ b/tests/server/test_tool_annotations.py @@ -1,11 +1,11 @@ from typing import Any -import mcp.types as mcp_types -from mcp.types import Tool as MCPTool -from mcp.types import ToolAnnotations, ToolExecution +from mcp_types import Tool as MCPTool +from mcp_types import ToolAnnotations, ToolExecution from fastmcp import Client, FastMCP from fastmcp.tools.base import Tool +from tests.conftest import make_server_request_context async def test_tool_annotations_in_tool_manager(): @@ -15,8 +15,8 @@ async def test_tool_annotations_in_tool_manager(): @mcp.tool( annotations=ToolAnnotations( title="Echo Tool", - readOnlyHint=True, - openWorldHint=False, + read_only_hint=True, + open_world_hint=False, ) ) def echo(message: str) -> str: @@ -28,8 +28,8 @@ async def test_tool_annotations_in_tool_manager(): assert len(tools) == 1 assert tools[0].annotations is not None assert tools[0].annotations.title == "Echo Tool" - assert tools[0].annotations.readOnlyHint is True - assert tools[0].annotations.openWorldHint is False + assert tools[0].annotations.read_only_hint is True + assert tools[0].annotations.open_world_hint is False async def test_tool_annotations_in_mcp_protocol(): @@ -39,8 +39,8 @@ async def test_tool_annotations_in_mcp_protocol(): @mcp.tool( annotations=ToolAnnotations( title="Echo Tool", - readOnlyHint=True, - openWorldHint=False, + read_only_hint=True, + open_world_hint=False, ) ) def echo(message: str) -> str: @@ -48,12 +48,12 @@ async def test_tool_annotations_in_mcp_protocol(): return message # Check via MCP protocol - result = await mcp._list_tools_mcp(mcp_types.ListToolsRequest()) + result = await mcp._on_list_tools(make_server_request_context(), None) assert len(result.tools) == 1 assert result.tools[0].annotations is not None assert result.tools[0].annotations.title == "Echo Tool" - assert result.tools[0].annotations.readOnlyHint is True - assert result.tools[0].annotations.openWorldHint is False + assert result.tools[0].annotations.read_only_hint is True + assert result.tools[0].annotations.open_world_hint is False async def test_tool_annotations_in_client_api(): @@ -63,8 +63,8 @@ async def test_tool_annotations_in_client_api(): @mcp.tool( annotations=ToolAnnotations( title="Echo Tool", - readOnlyHint=True, - openWorldHint=False, + read_only_hint=True, + open_world_hint=False, ) ) def echo(message: str) -> str: @@ -78,8 +78,8 @@ async def test_tool_annotations_in_client_api(): assert tools_result[0].name == "echo" assert tools_result[0].annotations is not None assert tools_result[0].annotations.title == "Echo Tool" - assert tools_result[0].annotations.readOnlyHint is True - assert tools_result[0].annotations.openWorldHint is False + assert tools_result[0].annotations.read_only_hint is True + assert tools_result[0].annotations.open_world_hint is False async def test_provide_tool_annotations_as_dict_to_decorator(): @@ -104,8 +104,8 @@ async def test_provide_tool_annotations_as_dict_to_decorator(): assert tools_result[0].name == "echo" assert tools_result[0].annotations is not None assert tools_result[0].annotations.title == "Echo Tool" - assert tools_result[0].annotations.readOnlyHint is True - assert tools_result[0].annotations.openWorldHint is False + assert tools_result[0].annotations.read_only_hint is True + assert tools_result[0].annotations.open_world_hint is False async def test_direct_tool_annotations_in_tool_manager(): @@ -114,10 +114,10 @@ async def test_direct_tool_annotations_in_tool_manager(): annotations = ToolAnnotations( title="Direct Tool", - readOnlyHint=False, - destructiveHint=True, - idempotentHint=False, - openWorldHint=True, + read_only_hint=False, + destructive_hint=True, + idempotent_hint=False, + open_world_hint=True, ) @mcp.tool(annotations=annotations) @@ -130,10 +130,10 @@ async def test_direct_tool_annotations_in_tool_manager(): assert len(tools) == 1 assert tools[0].annotations is not None assert tools[0].annotations.title == "Direct Tool" - assert tools[0].annotations.readOnlyHint is False - assert tools[0].annotations.destructiveHint is True - assert tools[0].annotations.idempotentHint is False - assert tools[0].annotations.openWorldHint is True + assert tools[0].annotations.read_only_hint is False + assert tools[0].annotations.destructive_hint is True + assert tools[0].annotations.idempotent_hint is False + assert tools[0].annotations.open_world_hint is True async def test_direct_tool_annotations_in_client_api(): @@ -142,10 +142,10 @@ async def test_direct_tool_annotations_in_client_api(): annotations = ToolAnnotations( title="Direct Tool", - readOnlyHint=False, - destructiveHint=True, - idempotentHint=False, - openWorldHint=True, + read_only_hint=False, + destructive_hint=True, + idempotent_hint=False, + open_world_hint=True, ) @mcp.tool(annotations=annotations) @@ -160,8 +160,8 @@ async def test_direct_tool_annotations_in_client_api(): assert tools_result[0].name == "modify" assert tools_result[0].annotations is not None assert tools_result[0].annotations.title == "Direct Tool" - assert tools_result[0].annotations.readOnlyHint is False - assert tools_result[0].annotations.destructiveHint is True + assert tools_result[0].annotations.read_only_hint is False + assert tools_result[0].annotations.destructive_hint is True async def test_add_tool_method_annotations(): @@ -177,8 +177,8 @@ async def test_add_tool_method_annotations(): name="create_item", annotations=ToolAnnotations( title="Create Item", - readOnlyHint=False, - destructiveHint=False, + read_only_hint=False, + destructive_hint=False, ), ) @@ -189,8 +189,8 @@ async def test_add_tool_method_annotations(): assert len(tools) == 1 assert tools[0].annotations is not None assert tools[0].annotations.title == "Create Item" - assert tools[0].annotations.readOnlyHint is False - assert tools[0].annotations.destructiveHint is False + assert tools[0].annotations.read_only_hint is False + assert tools[0].annotations.destructive_hint is False async def test_tool_functionality_with_annotations(): @@ -206,8 +206,8 @@ async def test_tool_functionality_with_annotations(): name="create_item", annotations=ToolAnnotations( title="Create Item", - readOnlyHint=False, - destructiveHint=False, + read_only_hint=False, + destructive_hint=False, ), ) mcp.add_tool(tool) @@ -221,7 +221,7 @@ async def test_tool_functionality_with_annotations(): async def test_task_execution_auto_populated_for_task_enabled_tool(): - """Test that execution.taskSupport is automatically set when tool has task=True.""" + """Test that execution.task_support is automatically set when tool has task=True.""" mcp = FastMCP("Test Server") @mcp.tool(task=True) @@ -235,7 +235,7 @@ async def test_task_execution_auto_populated_for_task_enabled_tool(): assert tools_result[0].name == "background_tool" assert isinstance(tools_result[0], MCPTool) assert isinstance(tools_result[0].execution, ToolExecution) - assert tools_result[0].execution.taskSupport == "optional" + assert tools_result[0].execution.task_support == "optional" async def test_task_execution_omitted_for_task_disabled_tool(): diff --git a/tests/server/test_tool_transformation.py b/tests/server/test_tool_transformation.py index b9812f735..1379e54dc 100644 --- a/tests/server/test_tool_transformation.py +++ b/tests/server/test_tool_transformation.py @@ -277,9 +277,9 @@ async def test_openapi_path_params_not_duplicated_in_description(): assert tool.description == "My endpoint" # Hidden param gone from schema, visible param still present - assert "version" not in tool.inputSchema.get("properties", {}) - assert "user_id" in tool.inputSchema["properties"] + assert "version" not in tool.input_schema.get("properties", {}) + assert "user_id" in tool.input_schema["properties"] assert ( - tool.inputSchema["properties"]["user_id"]["description"] + tool.input_schema["properties"]["user_id"]["description"] == "The user ID" ) diff --git a/tests/server/transforms/test_catalog.py b/tests/server/transforms/test_catalog.py index 978af1987..6d5f9825f 100644 --- a/tests/server/transforms/test_catalog.py +++ b/tests/server/transforms/test_catalog.py @@ -5,7 +5,7 @@ from __future__ import annotations import ast from collections.abc import Sequence -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.server.context import Context diff --git a/tests/server/transforms/test_resources_as_tools.py b/tests/server/transforms/test_resources_as_tools.py index 278d72c25..620a87c76 100644 --- a/tests/server/transforms/test_resources_as_tools.py +++ b/tests/server/transforms/test_resources_as_tools.py @@ -241,7 +241,7 @@ class TestResourcesAsToolsAnnotations: tools = await client.list_tools() tool = next(t for t in tools if t.name == "list_resources") assert tool.annotations is not None - assert tool.annotations.readOnlyHint is True + assert tool.annotations.read_only_hint is True async def test_read_resource_is_read_only(self): """read_resource is annotated as read-only by default.""" @@ -252,7 +252,7 @@ class TestResourcesAsToolsAnnotations: tools = await client.list_tools() tool = next(t for t in tools if t.name == "read_resource") assert tool.annotations is not None - assert tool.annotations.readOnlyHint is True + assert tool.annotations.read_only_hint is True def _deny_all(ctx: AuthContext) -> bool: diff --git a/tests/server/transforms/test_search.py b/tests/server/transforms/test_search.py index ee0f5ad40..981d044f2 100644 --- a/tests/server/transforms/test_search.py +++ b/tests/server/transforms/test_search.py @@ -6,9 +6,9 @@ from collections.abc import Sequence from typing import Any from unittest.mock import MagicMock -import mcp.types as mcp_types +import mcp_types import pytest -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import Client, FastMCP from fastmcp.server.context import Context diff --git a/tests/server/versioning/test_calls.py b/tests/server/versioning/test_calls.py index 67ac9d51a..01f117531 100644 --- a/tests/server/versioning/test_calls.py +++ b/tests/server/versioning/test_calls.py @@ -3,7 +3,7 @@ from __future__ import annotations -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.utilities.versions import ( diff --git a/tests/server/versioning/test_mounting.py b/tests/server/versioning/test_mounting.py index bceb7f9d8..f0bea357e 100644 --- a/tests/server/versioning/test_mounting.py +++ b/tests/server/versioning/test_mounting.py @@ -3,7 +3,7 @@ from __future__ import annotations -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.utilities.versions import ( diff --git a/tests/server/versioning/test_versioning.py b/tests/server/versioning/test_versioning.py index 689b2ce7b..3e2355a37 100644 --- a/tests/server/versioning/test_versioning.py +++ b/tests/server/versioning/test_versioning.py @@ -6,7 +6,7 @@ from __future__ import annotations from typing import cast import pytest -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.tools import Tool diff --git a/tests/server/versioning/test_visibility_version_fallback.py b/tests/server/versioning/test_visibility_version_fallback.py index 071c77d6e..2511839df 100644 --- a/tests/server/versioning/test_visibility_version_fallback.py +++ b/tests/server/versioning/test_visibility_version_fallback.py @@ -10,7 +10,7 @@ from __future__ import annotations from mcp.server.auth.middleware.auth_context import auth_context_var from mcp.server.auth.middleware.bearer_auth import AuthenticatedUser -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.server.auth import AccessToken, require_scopes diff --git a/tests/test_apps.py b/tests/test_apps.py index 39a612c80..dac7276cc 100644 --- a/tests/test_apps.py +++ b/tests/test_apps.py @@ -6,9 +6,15 @@ extension negotiation, and the ``Context.client_supports_extension`` method. from __future__ import annotations +from types import SimpleNamespace from typing import Any import pytest +from mcp_types import ( + ClientCapabilities, + Implementation, + InitializeRequestParams, +) from fastmcp import Client, FastMCP from fastmcp.apps import ( @@ -20,6 +26,7 @@ from fastmcp.apps import ( app_config_to_meta_dict, ) from fastmcp.server.context import Context +from fastmcp.server.low_level import client_supports_extension # --------------------------------------------------------------------------- # Model serialization @@ -385,6 +392,12 @@ class TestResourceWithApp: class TestExtensionAdvertisement: + @pytest.mark.xfail( + reason="SDK v2 strips capabilities.extensions at the negotiated " + "(pre-2026) handshake version, so the SEP-2133 UI extension is not " + "advertised to the client (sdk-feedback #2).", + strict=True, + ) async def test_capabilities_include_ui_extension(self): server = FastMCP("test") @@ -428,6 +441,69 @@ class TestContextClientSupportsExtension: assert ctx.client_supports_extension(UI_EXTENSION_ID) is False +class TestClientSupportsExtension: + """Tests for the low-level ``client_supports_extension`` helper. + + SDK v2 declares ``extensions`` as a real field on ``ClientCapabilities``, so + a client sending ``ClientCapabilities(extensions={...})`` populates the field + directly (``model_extra`` stays ``None``). The helper must read the real + field, not only ``model_extra``. + """ + + @staticmethod + def _session_with_capabilities( + capabilities: ClientCapabilities | None, + ) -> Any: + params: InitializeRequestParams | None = None + if capabilities is not None: + params = InitializeRequestParams( + protocol_version="2026-07-28", + capabilities=capabilities, + client_info=Implementation(name="test-client", version="1.0"), + ) + return SimpleNamespace(client_params=params) + + def test_real_extensions_field(self): + """A client that sets the real `extensions` field is detected.""" + caps = ClientCapabilities(extensions={UI_EXTENSION_ID: {}}) + # Guard: the regression this covers is the field being populated while + # model_extra stays empty. + assert caps.model_extra in (None, {}) + session = self._session_with_capabilities(caps) + assert client_supports_extension(session, UI_EXTENSION_ID) is True + + def test_real_extensions_field_without_target_extension(self): + caps = ClientCapabilities(extensions={"other/extension": {}}) + session = self._session_with_capabilities(caps) + assert client_supports_extension(session, UI_EXTENSION_ID) is False + + def test_legacy_model_extra_fallback(self): + """Defensive fallback: capabilities whose real `extensions` field is None + but which carry `extensions` in `model_extra` are still detected. + + SDK v2 always routes `extensions` to the real field, so this branch is + only reachable by a capabilities object serialized under an older schema; + we exercise it with a stand-in that mimics that shape. + """ + fake_caps = SimpleNamespace( + extensions=None, + model_extra={"extensions": {UI_EXTENSION_ID: {}}}, + ) + session: Any = SimpleNamespace( + client_params=SimpleNamespace(capabilities=fake_caps) + ) + assert client_supports_extension(session, UI_EXTENSION_ID) is True + + def test_no_extensions(self): + caps = ClientCapabilities() + session = self._session_with_capabilities(caps) + assert client_supports_extension(session, UI_EXTENSION_ID) is False + + def test_no_capabilities(self): + session = self._session_with_capabilities(None) + assert client_supports_extension(session, UI_EXTENSION_ID) is False + + # --------------------------------------------------------------------------- # Integration — full client↔server round-trip # --------------------------------------------------------------------------- @@ -465,7 +541,7 @@ class TestIntegration: resources = await client.list_resources() assert len(resources) == 1 assert str(resources[0].uri) == "ui://my-app/view.html" - assert resources[0].mimeType == UI_MIME_TYPE + assert resources[0].mime_type == UI_MIME_TYPE async def test_ui_resource_read_preserves_mime_type(self): """Reading a ui:// resource returns content with the correct MIME type.""" @@ -478,7 +554,7 @@ class TestIntegration: async with Client(server) as client: result = await client.read_resource_mcp("ui://my-app/view.html") assert len(result.contents) == 1 - assert result.contents[0].mimeType == UI_MIME_TYPE + assert result.contents[0].mime_type == UI_MIME_TYPE async def test_app_tool_callable(self): """A tool registered with app= is still callable normally.""" @@ -504,6 +580,12 @@ class TestIntegration: result = await client.call_tool("backend_greet", {"name": "Alice"}) assert any("Hello, Alice!" in str(c) for c in result.content) + @pytest.mark.xfail( + reason="SDK v2 strips capabilities.extensions at the negotiated " + "(pre-2026) handshake version, so the SEP-2133 UI extension is not " + "advertised to the client (sdk-feedback #2).", + strict=True, + ) async def test_extension_and_tool_together(self): """Server advertises extension AND tool has app meta.""" server = FastMCP("test") diff --git a/tests/test_apps_prefab.py b/tests/test_apps_prefab.py index 72311b614..f864ab785 100644 --- a/tests/test_apps_prefab.py +++ b/tests/test_apps_prefab.py @@ -8,7 +8,7 @@ from __future__ import annotations from typing import Annotated -from mcp.types import TextContent +from mcp_types import TextContent from prefab_ui.app import PROTOCOL_VERSION, PrefabApp from prefab_ui.components import Column, Heading, Text from prefab_ui.components.base import Component diff --git a/tests/test_compat.py b/tests/test_compat.py new file mode 100644 index 000000000..bb2c1233a --- /dev/null +++ b/tests/test_compat.py @@ -0,0 +1,243 @@ +"""Tests for the MCP SDK v2 camelCase compatibility bridge (fastmcp._compat).""" + +import datetime +import warnings + +import mcp_types +import pytest +from mcp import MCPError as SDKMCPError + +import fastmcp +import fastmcp._compat as _compat +from fastmcp import Client, FastMCP +from fastmcp.client.transports import FastMCPTransport +from fastmcp.exceptions import FastMCPDeprecationWarning, MCPError, McpError + + +def _reset_warn_once() -> None: + """Reinstall the shims so every property's warn-once flag starts fresh. + + Each bridged property closes over its own `warned` flag which persists for + the life of the process. Rebuilding the properties gives tests a clean slate + without leaking warning state across tests. + """ + for cls, mapping in _compat._ALIASES.items(): + for camel in mapping: + attr = cls.__dict__.get(camel) + if isinstance(attr, property): + delattr(cls, camel) + _compat._installed = False + _compat.install() + + +@pytest.fixture(autouse=True) +def fresh_shims(): + _reset_warn_once() + yield + + +class TestCamelCaseBridge: + def test_tool_input_schema_bridged(self): + tool = mcp_types.Tool(name="t", input_schema={"type": "object"}) + with pytest.warns(FastMCPDeprecationWarning): + assert tool.inputSchema == {"type": "object"} # ty: ignore[unresolved-attribute] + + def test_tool_output_schema_bridged(self): + tool = mcp_types.Tool( + name="t", + input_schema={"type": "object"}, + output_schema={"type": "string"}, + ) + with pytest.warns(FastMCPDeprecationWarning): + assert tool.outputSchema == {"type": "string"} # ty: ignore[unresolved-attribute] + + def test_call_tool_result_is_error_bridged(self): + result = mcp_types.CallToolResult(content=[], is_error=True) + with pytest.warns(FastMCPDeprecationWarning): + assert result.isError is True # ty: ignore[unresolved-attribute] + + def test_call_tool_result_structured_content_bridged(self): + result = mcp_types.CallToolResult(content=[], structured_content={"a": 1}) + with pytest.warns(FastMCPDeprecationWarning): + assert result.structuredContent == {"a": 1} # ty: ignore[unresolved-attribute] + + def test_resource_mime_type_bridged(self): + resource = mcp_types.Resource(name="r", uri="file:///x", mime_type="text/plain") + with pytest.warns(FastMCPDeprecationWarning): + assert resource.mimeType == "text/plain" # ty: ignore[unresolved-attribute] + + def test_resource_template_uri_template_bridged(self): + template = mcp_types.ResourceTemplate(name="rt", uri_template="file:///{id}") + with pytest.warns(FastMCPDeprecationWarning): + assert template.uriTemplate == "file:///{id}" # ty: ignore[unresolved-attribute] + + def test_completion_has_more_bridged(self): + completion = mcp_types.Completion(values=["a"], has_more=True) + with pytest.warns(FastMCPDeprecationWarning): + assert completion.hasMore is True # ty: ignore[unresolved-attribute] + + def test_list_tools_result_next_cursor_bridged(self): + result = mcp_types.ListToolsResult(tools=[], next_cursor="abc") + with pytest.warns(FastMCPDeprecationWarning): + assert result.nextCursor == "abc" # ty: ignore[unresolved-attribute] + + def test_sampling_params_max_tokens_bridged(self): + params = mcp_types.CreateMessageRequestParams(messages=[], max_tokens=100) + with pytest.warns(FastMCPDeprecationWarning): + assert params.maxTokens == 100 # ty: ignore[unresolved-attribute] + + def test_elicit_form_params_requested_schema_bridged(self): + params = mcp_types.ElicitRequestFormParams( + message="hi", requested_schema={"type": "object", "properties": {}} + ) + with pytest.warns(FastMCPDeprecationWarning): + assert params.requestedSchema == {"type": "object", "properties": {}} # ty: ignore[unresolved-attribute] + + +class TestWarnOnce: + def test_warns_exactly_once_per_class_name(self): + with warnings.catch_warnings(record=True) as caught: + warnings.simplefilter("always") + t1 = mcp_types.Tool(name="a", input_schema={"type": "object"}) + t2 = mcp_types.Tool(name="b", input_schema={"type": "string"}) + _ = t1.inputSchema # ty: ignore[unresolved-attribute] + _ = t2.inputSchema # ty: ignore[unresolved-attribute] + _ = t1.inputSchema # ty: ignore[unresolved-attribute] + deprecations = [ + w for w in caught if issubclass(w.category, FastMCPDeprecationWarning) + ] + assert len(deprecations) == 1 + + def test_distinct_names_warn_independently(self): + with warnings.catch_warnings(record=True) as caught: + warnings.simplefilter("always") + tool = mcp_types.Tool( + name="a", + input_schema={"type": "object"}, + output_schema={"type": "string"}, + ) + _ = tool.inputSchema # ty: ignore[unresolved-attribute] + _ = tool.outputSchema # ty: ignore[unresolved-attribute] + deprecations = [ + w for w in caught if issubclass(w.category, FastMCPDeprecationWarning) + ] + assert len(deprecations) == 2 + + +class TestModelRoundTrip: + def test_survives_model_copy(self): + tool = mcp_types.Tool(name="t", input_schema={"type": "object"}) + copied = tool.model_copy() + with warnings.catch_warnings(): + warnings.simplefilter("ignore") + assert copied.inputSchema == {"type": "object"} # ty: ignore[unresolved-attribute] + + def test_survives_model_validate(self): + tool = mcp_types.Tool.model_validate( + {"name": "t", "inputSchema": {"type": "object"}} + ) + with warnings.catch_warnings(): + warnings.simplefilter("ignore") + assert tool.inputSchema == {"type": "object"} # ty: ignore[unresolved-attribute] + assert tool.input_schema == {"type": "object"} + + +class TestGuards: + def test_does_not_shadow_existing_snake_field(self): + # The real snake_case field must always resolve without warning. + with warnings.catch_warnings(record=True) as caught: + warnings.simplefilter("always") + tool = mcp_types.Tool(name="t", input_schema={"type": "object"}) + assert tool.input_schema == {"type": "object"} + assert not caught + + def test_install_is_idempotent(self): + _compat.install() + _compat.install() + tool = mcp_types.Tool(name="t", input_schema={"type": "object"}) + with pytest.warns(FastMCPDeprecationWarning): + assert tool.inputSchema == {"type": "object"} # ty: ignore[unresolved-attribute] + + +class TestSettingOff: + def test_setting_off_raises_attribute_error(self, monkeypatch): + # The property stays installed, but with the setting disabled the getter + # raises AttributeError as if the camelCase name never existed. + monkeypatch.setattr(fastmcp.settings, "mcp_camelcase_compat", False) + tool = mcp_types.Tool(name="t", input_schema={"type": "object"}) + with pytest.raises(AttributeError): + _ = tool.inputSchema # ty: ignore[unresolved-attribute] + + def test_setting_off_attribute_error_message(self, monkeypatch): + monkeypatch.setattr(fastmcp.settings, "mcp_camelcase_compat", False) + tool = mcp_types.Tool(name="t", input_schema={"type": "object"}) + with pytest.raises( + AttributeError, + match=r"'Tool' object has no attribute 'inputSchema'", + ): + _ = tool.inputSchema # ty: ignore[unresolved-attribute] + + def test_runtime_toggle_on_off_on(self, monkeypatch): + # The bridge honours the live setting on every read: on -> off -> on. + tool = mcp_types.Tool(name="t", input_schema={"type": "object"}) + + # On (default): bridged read works and warns. + with pytest.warns(FastMCPDeprecationWarning): + assert tool.inputSchema == {"type": "object"} # ty: ignore[unresolved-attribute] + + # Off: same attribute now raises. + monkeypatch.setattr(fastmcp.settings, "mcp_camelcase_compat", False) + with pytest.raises(AttributeError): + _ = tool.inputSchema # ty: ignore[unresolved-attribute] + + # Back on: resolves again (warn-once may have fired already, so ignore). + monkeypatch.setattr(fastmcp.settings, "mcp_camelcase_compat", True) + with warnings.catch_warnings(): + warnings.simplefilter("ignore") + assert tool.inputSchema == {"type": "object"} # ty: ignore[unresolved-attribute] + + +class TestExceptionAlias: + def test_mcp_error_is_alias(self): + assert McpError is MCPError + assert McpError is SDKMCPError + + def test_except_mcp_error_catches_sdk_raised(self): + with pytest.raises(McpError): + raise SDKMCPError(code=-32000, message="boom") + + +class TestClientBehaviorCompat: + """Behavior compat checklist (design decision D).""" + + @pytest.fixture + def server(self): + srv = FastMCP("BehaviorServer") + + @srv.tool + def echo(x: str) -> str: + return x + + return srv + + @pytest.mark.parametrize( + "timeout", + [5, 5.0, datetime.timedelta(seconds=5), None], + ) + async def test_client_accepts_timedelta_or_float_timeout(self, server, timeout): + client = Client(transport=FastMCPTransport(server), timeout=timeout) + async with client: + result = await client.call_tool("echo", {"x": "hi"}) + assert result.data == "hi" + + async def test_ping_returns_bool(self, server): + client = Client(transport=FastMCPTransport(server)) + async with client: + result = await client.ping() + assert result is True + + async def test_session_id_none_safe(self, server): + # In-memory transport has no HTTP session id; must return None, not raise. + client = Client(transport=FastMCPTransport(server)) + async with client: + assert client.transport.get_session_id() is None diff --git a/tests/test_fastmcp_app.py b/tests/test_fastmcp_app.py index 72d693c7e..86f9eae60 100644 --- a/tests/test_fastmcp_app.py +++ b/tests/test_fastmcp_app.py @@ -882,7 +882,7 @@ class TestAppIntegration: # Call the UI tool through the client and check structured_content result = await client.call_tool_mcp("crm_contact_form", {}) - sc = result.structuredContent + sc = result.structured_content assert sc is not None # Call the backend tool via its hashed address — bypasses namespace diff --git a/tests/test_mcp_config.py b/tests/test_mcp_config.py index d3b295f0d..13b8b67c9 100644 --- a/tests/test_mcp_config.py +++ b/tests/test_mcp_config.py @@ -8,14 +8,13 @@ import sys import tempfile import time from collections.abc import AsyncGenerator -from datetime import timedelta from pathlib import Path from typing import Any from unittest.mock import AsyncMock, patch import psutil import pytest -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.client.auth.bearer import BearerAuth @@ -961,7 +960,8 @@ async def test_multi_server_timeout_propagation(): ) transport = MCPConfigTransport(config) - timeout = timedelta(seconds=42) + # SDK v2: read_timeout_seconds is a plain number of seconds, not a timedelta. + timeout = 42.0 # Mock _create_proxy to avoid real stdio connections and verify timeout mock_create_proxy = AsyncMock( diff --git a/tests/tools/test_tool_future_annotations.py b/tests/tools/test_tool_future_annotations.py index acddc76c4..2723843ca 100644 --- a/tests/tools/test_tool_future_annotations.py +++ b/tests/tools/test_tool_future_annotations.py @@ -2,7 +2,7 @@ from __future__ import annotations from typing import Annotated, Any, Literal, cast -import mcp.types +import mcp_types from pydantic import Field from fastmcp import Context, FastMCP @@ -73,7 +73,7 @@ class TestFutureAnnotations: async def test_simple_with_context(self): async with Client(fastmcp_server) as client: result = await client.call_tool("simple_with_context", {}) - assert "Request ID:" in cast(mcp.types.TextContent, result.content[0]).text + assert "Request ID:" in cast(mcp_types.TextContent, result.content[0]).text async def test_complex_types(self): async with Client(fastmcp_server) as client: @@ -83,7 +83,7 @@ class TestFutureAnnotations: # Check the result is valid JSON with expected values import json - data = json.loads(cast(mcp.types.TextContent, result.content[0]).text) + data = json.loads(cast(mcp_types.TextContent, result.content[0]).text) assert data["count"] == 3 assert "request_id" in data @@ -92,7 +92,7 @@ class TestFutureAnnotations: result = await client.call_tool("optional_context", {"name": "World"}) assert ( "Hello World from request" - in cast(mcp.types.TextContent, result.content[0]).text + in cast(mcp_types.TextContent, result.content[0]).text ) async def test_union_with_context(self): @@ -100,20 +100,20 @@ class TestFutureAnnotations: result = await client.call_tool("union_with_context", {"value": 42}) assert ( "Value: 42, Request:" - in cast(mcp.types.TextContent, result.content[0]).text + in cast(mcp_types.TextContent, result.content[0]).text ) async def test_returns_image(self): async with Client(fastmcp_server) as client: result = await client.call_tool("returns_image", {}) assert result.content[0].type == "image" - assert result.content[0].mimeType == "image/png" + assert result.content[0].mime_type == "image/png" async def test_async_with_context(self): async with Client(fastmcp_server) as client: result = await client.call_tool("async_with_context", {}) assert ( - "Async request:" in cast(mcp.types.TextContent, result.content[0]).text + "Async request:" in cast(mcp_types.TextContent, result.content[0]).text ) async def test_annotated_with_context(self): @@ -124,14 +124,14 @@ class TestFutureAnnotations: ) assert ( "Result for: hello" - in cast(mcp.types.TextContent, result.content[0]).text + in cast(mcp_types.TextContent, result.content[0]).text ) async def test_literal_with_context(self): """Test Literal types work with Context and future annotations.""" async with Client(fastmcp_server) as client: result = await client.call_tool("literal_with_context", {"mode": "fast"}) - assert "Mode: fast" in cast(mcp.types.TextContent, result.content[0]).text + assert "Mode: fast" in cast(mcp_types.TextContent, result.content[0]).text async def test_modern_union_syntax_works(self): """Test that modern | union syntax works with future annotations.""" @@ -151,13 +151,13 @@ class TestFutureAnnotations: result = await client.call_tool("modern_union_tool", {"value": "hello"}) assert ( "processed: hello" - in cast(mcp.types.TextContent, result.content[0]).text + in cast(mcp_types.TextContent, result.content[0]).text ) # Test with int result = await client.call_tool("modern_union_tool", {"value": 42}) assert ( - "processed: 42" in cast(mcp.types.TextContent, result.content[0]).text + "processed: 42" in cast(mcp_types.TextContent, result.content[0]).text ) # Test with None @@ -165,7 +165,7 @@ class TestFutureAnnotations: # When function returns None, FastMCP returns empty content assert ( len(result.content) == 0 - or cast(mcp.types.TextContent, result.content[0]).text == "null" + or cast(mcp_types.TextContent, result.content[0]).text == "null" ) diff --git a/tests/tools/test_tool_run_in_thread.py b/tests/tools/test_tool_run_in_thread.py index 96f661473..069024905 100644 --- a/tests/tools/test_tool_run_in_thread.py +++ b/tests/tools/test_tool_run_in_thread.py @@ -13,7 +13,7 @@ import threading from collections.abc import AsyncIterator import pytest -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import Context, FastMCP from fastmcp.tools.base import Tool diff --git a/tests/tools/test_tool_timeout.py b/tests/tools/test_tool_timeout.py index f93a2d8d6..301986f92 100644 --- a/tests/tools/test_tool_timeout.py +++ b/tests/tools/test_tool_timeout.py @@ -4,8 +4,8 @@ import time import anyio import pytest -from mcp.shared.exceptions import McpError -from mcp.types import TextContent +from mcp.shared.exceptions import MCPError +from mcp_types import TextContent from fastmcp import FastMCP from fastmcp.exceptions import ToolError @@ -188,5 +188,5 @@ class TestToolTimeout: return "never" # TimeoutError should be caught and converted to ToolError - with pytest.raises((ToolError, McpError)): + with pytest.raises((ToolError, MCPError)): await mcp.call_tool("times_out") diff --git a/tests/tools/tool/test_callable.py b/tests/tools/tool/test_callable.py index 83dd149ce..888ccc125 100644 --- a/tests/tools/tool/test_callable.py +++ b/tests/tools/tool/test_callable.py @@ -1,7 +1,7 @@ import asyncio import threading -from mcp.types import TextContent +from mcp_types import TextContent from fastmcp import Context, FastMCP from fastmcp.tools.base import Tool diff --git a/tests/tools/tool/test_content.py b/tests/tools/tool/test_content.py index 0ffe54385..4d9635e34 100644 --- a/tests/tools/tool/test_content.py +++ b/tests/tools/tool/test_content.py @@ -2,7 +2,7 @@ from dataclasses import dataclass import pytest from inline_snapshot import snapshot -from mcp.types import ( +from mcp_types import ( AudioContent, BlobResourceContents, EmbeddedResource, @@ -11,7 +11,7 @@ from mcp.types import ( TextContent, TextResourceContents, ) -from pydantic import AnyUrl, BaseModel +from pydantic import BaseModel from fastmcp.tools.base import Tool, _convert_to_content from fastmcp.utilities.types import Audio, File, Image @@ -104,21 +104,21 @@ class TestConvertResultToContent: argnames="content_block", argvalues=[ (TextContent(type="text", text="hello")), - (ImageContent(type="image", data="fakeimagedata", mimeType="image/png")), - (AudioContent(type="audio", data="fakeaudiodata", mimeType="audio/mpeg")), + (ImageContent(type="image", data="fakeimagedata", mime_type="image/png")), + (AudioContent(type="audio", data="fakeaudiodata", mime_type="audio/mpeg")), ( ResourceLink( type="resource_link", name="test resource", - uri=AnyUrl("resource://test"), + uri="resource://test", ) ), ( EmbeddedResource( type="resource", resource=TextResourceContents( - uri=AnyUrl("resource://test"), - mimeType="text/plain", + uri="resource://test", + mime_type="text/plain", text="resource content", ), ) @@ -140,7 +140,7 @@ class TestConvertResultToContent: Image(data=b"fakeimagedata"), [ ImageContent( - type="image", data="ZmFrZWltYWdlZGF0YQ==", mimeType="image/png" + type="image", data="ZmFrZWltYWdlZGF0YQ==", mime_type="image/png" ) ], ), @@ -148,7 +148,7 @@ class TestConvertResultToContent: Audio(data=b"fakeaudiodata"), [ AudioContent( - type="audio", data="ZmFrZWF1ZGlvZGF0YQ==", mimeType="audio/wav" + type="audio", data="ZmFrZWF1ZGlvZGF0YQ==", mime_type="audio/wav" ) ], ), @@ -158,9 +158,9 @@ class TestConvertResultToContent: EmbeddedResource( type="resource", resource=BlobResourceContents( - uri=AnyUrl("file:///resource.octet-stream"), + uri="file:///resource.octet-stream", blob="ZmlsZWRhdGE=", - mimeType="application/octet-stream", + mime_type="application/octet-stream", ), ) ], @@ -187,13 +187,13 @@ class TestConvertResultToContent: ResourceLink( type="resource_link", name="test resource", - uri=AnyUrl("resource://test"), + uri="resource://test", ), EmbeddedResource( type="resource", resource=TextResourceContents( - uri=AnyUrl("resource://test"), - mimeType="text/plain", + uri="resource://test", + mime_type="text/plain", text="resource content", ), ), @@ -209,21 +209,21 @@ class TestConvertResultToContent: TextContent(type="text", text='{"key":"value"}'), TextContent(type="text", text='{"x":1,"y":"hello"}'), ImageContent( - type="image", data="ZmFrZWltYWdlZGF0YQ==", mimeType="image/png" + type="image", data="ZmFrZWltYWdlZGF0YQ==", mime_type="image/png" ), AudioContent( - type="audio", data="ZmFrZWF1ZGlvZGF0YQ==", mimeType="audio/wav" + type="audio", data="ZmFrZWF1ZGlvZGF0YQ==", mime_type="audio/wav" ), ResourceLink( name="test resource", - uri=AnyUrl("resource://test"), + uri="resource://test", type="resource_link", ), EmbeddedResource( type="resource", resource=TextResourceContents( - uri=AnyUrl("resource://test"), - mimeType="text/plain", + uri="resource://test", + mime_type="text/plain", text="resource content", ), ), @@ -475,7 +475,7 @@ class TestAutomaticStructuredContent: assert result.content == snapshot( [ AudioContent( - type="audio", data="ZmFrZWF1ZGlvZGF0YQ==", mimeType="audio/wav" + type="audio", data="ZmFrZWF1ZGlvZGF0YQ==", mime_type="audio/wav" ) ] ) diff --git a/tests/tools/tool/test_output_schema.py b/tests/tools/tool/test_output_schema.py index 11d850a7f..d63089bbb 100644 --- a/tests/tools/tool/test_output_schema.py +++ b/tests/tools/tool/test_output_schema.py @@ -3,7 +3,7 @@ from typing import Annotated, Any import pytest from inline_snapshot import snapshot -from mcp.types import AudioContent, EmbeddedResource, ImageContent, TextContent +from mcp_types import AudioContent, EmbeddedResource, ImageContent, TextContent from pydantic import AnyUrl, BaseModel, Field, TypeAdapter from typing_extensions import TypedDict diff --git a/tests/tools/tool/test_results.py b/tests/tools/tool/test_results.py index fc3668273..830d5f1f1 100644 --- a/tests/tools/tool/test_results.py +++ b/tests/tools/tool/test_results.py @@ -3,7 +3,7 @@ from dataclasses import dataclass from typing import Annotated, Any import pytest -from mcp.types import CallToolResult, TextContent +from mcp_types import CallToolResult, TextContent from pydantic import BaseModel, ConfigDict, Field from fastmcp import Client, FastMCP @@ -83,10 +83,10 @@ class TestToolResultIsError: ) mcp_result = result.to_mcp_result() assert isinstance(mcp_result, CallToolResult) - assert mcp_result.isError is True + assert mcp_result.is_error is True assert isinstance(mcp_result.content[0], TextContent) assert mcp_result.content[0].text == "boom" - assert mcp_result.structuredContent == {"code": 42} + assert mcp_result.structured_content == {"code": 42} def test_default_is_not_error(self): result = ToolResult(content="ok") @@ -269,7 +269,7 @@ class TestSerializeByAlias: "id": "123", "filepath": "/p", } - assert set(tools["get_biofile"].outputSchema["properties"]) == { # type: ignore[index] + assert set(tools["get_biofile"].output_schema["properties"]) == { # type: ignore[index] "id", "filepath", } @@ -292,7 +292,7 @@ class TestSerializeByAlias: result = await client.call_tool("get_biofile", {}) assert result.structured_content == {"_id": "123", "filepath": "/p"} - assert set(tools["get_biofile"].outputSchema["properties"]) == { # type: ignore[index] + assert set(tools["get_biofile"].output_schema["properties"]) == { # type: ignore[index] "_id", "filepath", } @@ -315,7 +315,7 @@ class TestSerializeByAlias: result = await client.call_tool("get_biofile", {}) assert result.structured_content == {"_id": "123"} - assert set(tools["get_biofile"].outputSchema["properties"]) == {"_id"} # type: ignore[index] + assert set(tools["get_biofile"].output_schema["properties"]) == {"_id"} # type: ignore[index] async def test_nested_models_respect_config(self): """serialize_by_alias=False propagates through nested models.""" @@ -364,7 +364,7 @@ class TestSerializeByAlias: # raises if they disagree result = await client.call_tool("get_biofile", {}) - schema_props = set(tools["get_biofile"].outputSchema["properties"]) # type: ignore[index] + schema_props = set(tools["get_biofile"].output_schema["properties"]) # type: ignore[index] assert schema_props == set(result.structured_content) # type: ignore[arg-type] assert result.structured_content == {"result": {"id": "1"}} @@ -391,5 +391,5 @@ class TestSerializeByAlias: tools = {t.name: t for t in await client.list_tools()} result = await client.call_tool("get_model", {}) - schema_props = set(tools["get_model"].outputSchema["properties"]) # type: ignore[index] + schema_props = set(tools["get_model"].output_schema["properties"]) # type: ignore[index] assert schema_props == set(result.structured_content) # type: ignore[arg-type] diff --git a/tests/tools/tool/test_title.py b/tests/tools/tool/test_title.py index f69a9418c..29c0c1a73 100644 --- a/tests/tools/tool/test_title.py +++ b/tests/tools/tool/test_title.py @@ -47,7 +47,7 @@ class TestToolTitle: def test_tool_title_priority(self): """Test that explicit title takes priority over annotations.title.""" - from mcp.types import ToolAnnotations + from mcp_types import ToolAnnotations def divide(x: int, y: int) -> float: """Divide two numbers.""" @@ -72,7 +72,7 @@ class TestToolTitle: def test_tool_annotations_title_fallback(self): """Test that annotations.title is used when no explicit title is provided.""" - from mcp.types import ToolAnnotations + from mcp_types import ToolAnnotations def modulo(x: int, y: int) -> int: """Get modulo of two numbers.""" diff --git a/tests/tools/tool/test_tool.py b/tests/tools/tool/test_tool.py index 002d41a88..d877b7046 100644 --- a/tests/tools/tool/test_tool.py +++ b/tests/tools/tool/test_tool.py @@ -3,7 +3,7 @@ from datetime import timedelta import pytest from dirty_equals import HasName from inline_snapshot import snapshot -from mcp.types import ( +from mcp_types import ( AudioContent, ImageContent, ToolExecution, @@ -251,8 +251,6 @@ class TestToolFromFunction: assert isinstance(result.content[0], AudioContent) async def test_tool_with_file_return(self): - from pydantic import AnyUrl - def file_tool(data: bytes) -> File: return File(data=data, format="octet-stream") @@ -265,8 +263,8 @@ class TestToolFromFunction: { "type": "resource", "resource": { - "uri": AnyUrl("file:///resource.octet-stream"), - "mimeType": "application/octet-stream", + "uri": "file:///resource.octet-stream", + "mime_type": "application/octet-stream", "blob": "dGVzdC5iaW4=", }, } @@ -542,12 +540,12 @@ class TestToolExecutionField: name="my_tool", description="A tool with execution", parameters={"type": "object", "properties": {}}, - execution=ToolExecution(taskSupport="optional"), + execution=ToolExecution(task_support="optional"), ) mcp_tool = tool.to_mcp_tool() assert mcp_tool.execution is not None - assert mcp_tool.execution.taskSupport == "optional" + assert mcp_tool.execution.task_support == "optional" def test_tool_without_execution_field(self): """Test that Tool without execution returns None.""" @@ -566,13 +564,13 @@ class TestToolExecutionField: name="my_tool", description="A tool", parameters={"type": "object", "properties": {}}, - execution=ToolExecution(taskSupport="optional"), + execution=ToolExecution(task_support="optional"), ) - override_execution = ToolExecution(taskSupport="required") + override_execution = ToolExecution(task_support="required") mcp_tool = tool.to_mcp_tool(execution=override_execution) assert mcp_tool.execution is not None - assert mcp_tool.execution.taskSupport == "required" + assert mcp_tool.execution.task_support == "required" async def test_function_tool_task_config_still_works(self): """FunctionTool should still derive execution from task_config.""" @@ -585,7 +583,7 @@ class TestToolExecutionField: # FunctionTool sets execution from task_config assert mcp_tool.execution is not None - assert mcp_tool.execution.taskSupport == "optional" + assert mcp_tool.execution.task_support == "optional" def test_tool_execution_required_mode(self): """Test that Tool can store required execution mode.""" @@ -593,12 +591,12 @@ class TestToolExecutionField: name="my_tool", description="A tool with required execution", parameters={"type": "object", "properties": {}}, - execution=ToolExecution(taskSupport="required"), + execution=ToolExecution(task_support="required"), ) mcp_tool = tool.to_mcp_tool() assert mcp_tool.execution is not None - assert mcp_tool.execution.taskSupport == "required" + assert mcp_tool.execution.task_support == "required" def test_tool_execution_forbidden_mode(self): """Test that Tool can store forbidden execution mode.""" @@ -606,9 +604,9 @@ class TestToolExecutionField: name="my_tool", description="A tool with forbidden execution", parameters={"type": "object", "properties": {}}, - execution=ToolExecution(taskSupport="forbidden"), + execution=ToolExecution(task_support="forbidden"), ) mcp_tool = tool.to_mcp_tool() assert mcp_tool.execution is not None - assert mcp_tool.execution.taskSupport == "forbidden" + assert mcp_tool.execution.task_support == "forbidden" diff --git a/tests/tools/tool_transform/test_args.py b/tests/tools/tool_transform/test_args.py index 7d82169e4..7401527dc 100644 --- a/tests/tools/tool_transform/test_args.py +++ b/tests/tools/tool_transform/test_args.py @@ -4,7 +4,7 @@ from dataclasses import dataclass from typing import Annotated, Any import pytest -from mcp.types import TextContent +from mcp_types import TextContent from pydantic import BaseModel, Field from typing_extensions import TypedDict diff --git a/tests/tools/tool_transform/test_schemas.py b/tests/tools/tool_transform/test_schemas.py index b557186a5..703dd7955 100644 --- a/tests/tools/tool_transform/test_schemas.py +++ b/tests/tools/tool_transform/test_schemas.py @@ -3,7 +3,7 @@ from typing import Annotated, Any import pytest from dirty_equals import IsList from inline_snapshot import snapshot -from mcp.types import TextContent +from mcp_types import TextContent from pydantic import BaseModel, Field, TypeAdapter from fastmcp.tools import Tool, forward diff --git a/tests/tools/tool_transform/test_tool_transform.py b/tests/tools/tool_transform/test_tool_transform.py index c7a6b88ea..dcee4cf97 100644 --- a/tests/tools/tool_transform/test_tool_transform.py +++ b/tests/tools/tool_transform/test_tool_transform.py @@ -4,7 +4,7 @@ import re from typing import Annotated, Any import pytest -from mcp.types import TextContent +from mcp_types import TextContent from pydantic import BaseModel, Field from fastmcp import FastMCP diff --git a/tests/utilities/openapi/test_circular_references.py b/tests/utilities/openapi/test_circular_references.py index 3c5a98c79..ed08d5e06 100644 --- a/tests/utilities/openapi/test_circular_references.py +++ b/tests/utilities/openapi/test_circular_references.py @@ -102,13 +102,13 @@ class TestCircularReferencesSerialization: # Build an MCP Tool with this schema and try to serialize it — # this is the exact path that crashes in the reported issue. - from mcp.types import Tool as MCPTool + from mcp_types import Tool as MCPTool tool = MCPTool( name="get_node", description="Get a node", - inputSchema={"type": "object", "properties": {}}, - outputSchema=output_schema, + input_schema={"type": "object", "properties": {}}, + output_schema=output_schema, ) # This must not raise ValueError: Circular reference detected tool.model_dump(by_alias=True, mode="json", exclude_none=True) @@ -148,13 +148,13 @@ class TestCircularReferencesSerialization: ) assert output_schema is not None - from mcp.types import Tool as MCPTool + from mcp_types import Tool as MCPTool tool = MCPTool( name="get_pr", description="Get a pull request", - inputSchema={"type": "object", "properties": {}}, - outputSchema=output_schema, + input_schema={"type": "object", "properties": {}}, + output_schema=output_schema, ) tool.model_dump(by_alias=True, mode="json", exclude_none=True) diff --git a/tests/utilities/openapi/test_nullable_fields.py b/tests/utilities/openapi/test_nullable_fields.py index ff1881e46..ccdfe8c43 100644 --- a/tests/utilities/openapi/test_nullable_fields.py +++ b/tests/utilities/openapi/test_nullable_fields.py @@ -458,7 +458,7 @@ class TestNullableInputSchemaIntegration: """Test that nullable fields are converted in tool input schemas end-to-end. These tests exercise the full pipeline: OpenAPI spec -> OpenAPIProvider -> - tool.inputSchema, verifying that `nullable: true` doesn't leak through. + tool.input_schema, verifying that `nullable: true` doesn't leak through. """ async def test_nullable_query_param_converted_in_tool_input_schema(self): @@ -496,7 +496,7 @@ class TestNullableInputSchemaIntegration: async with Client(mcp) as mcp_client: tools = await mcp_client.list_tools() assert len(tools) == 1 - schema = tools[0].inputSchema + schema = tools[0].input_schema category_prop = schema["properties"]["category"] assert "nullable" not in category_prop assert category_prop["type"] == ["string", "null"] @@ -545,7 +545,7 @@ class TestNullableInputSchemaIntegration: async with Client(mcp) as mcp_client: tools = await mcp_client.list_tools() assert len(tools) == 1 - schema = tools[0].inputSchema + schema = tools[0].input_schema # Find the bio property — it may be inline or in $defs if "$defs" in schema: diff --git a/tests/utilities/test_inspect.py b/tests/utilities/test_inspect.py index d846c844a..9b9b70d70 100644 --- a/tests/utilities/test_inspect.py +++ b/tests/utilities/test_inspect.py @@ -2,7 +2,7 @@ import importlib.metadata -from mcp.server.fastmcp import FastMCP as FastMCP1x +from mcp.server.mcpserver import MCPServer as SDKServer import fastmcp from fastmcp import Client, FastMCP @@ -467,7 +467,7 @@ class TestFastMCP1xCompatibility: async def test_fastmcp1x_empty_server(self): """Test get_fastmcp_info_v1 with an empty FastMCP1x server.""" - mcp = FastMCP1x("Test1x") + mcp = SDKServer("Test1x") info = await inspect_fastmcp_v1(mcp) @@ -485,7 +485,7 @@ class TestFastMCP1xCompatibility: async def test_fastmcp1x_with_tools(self): """Test get_fastmcp_info_v1 with a FastMCP1x server that has tools.""" - mcp = FastMCP1x("Test1x") + mcp = SDKServer("Test1x") @mcp.tool() def add_numbers(a: int, b: int) -> int: @@ -505,7 +505,7 @@ class TestFastMCP1xCompatibility: async def test_fastmcp1x_with_resources(self): """Test get_fastmcp_info_v1 with a FastMCP1x server that has resources.""" - mcp = FastMCP1x("Test1x") + mcp = SDKServer("Test1x") @mcp.resource("resource://data") def get_data() -> str: @@ -522,7 +522,7 @@ class TestFastMCP1xCompatibility: async def test_fastmcp1x_with_prompts(self): """Test get_fastmcp_info_v1 with a FastMCP1x server that has prompts.""" - mcp = FastMCP1x("Test1x") + mcp = SDKServer("Test1x") @mcp.prompt("analyze") def analyze_data(data: str) -> list: @@ -537,7 +537,7 @@ class TestFastMCP1xCompatibility: async def test_dispatcher_with_fastmcp1x(self): """Test that the main get_fastmcp_info function correctly dispatches to v1.""" - mcp = FastMCP1x("Test1x") + mcp = SDKServer("Test1x") @mcp.tool() def test_tool() -> str: @@ -569,7 +569,7 @@ class TestFastMCP1xCompatibility: async def test_fastmcp1x_vs_fastmcp2x_comparison(self): """Test that both versions can be inspected and compared.""" - mcp1x = FastMCP1x("Test1x") + mcp1x = SDKServer("Test1x") mcp2x = FastMCP("Test2x") @mcp1x.tool() diff --git a/tests/utilities/test_inspect_icons.py b/tests/utilities/test_inspect_icons.py index bba995545..14c37f6f6 100644 --- a/tests/utilities/test_inspect_icons.py +++ b/tests/utilities/test_inspect_icons.py @@ -2,7 +2,7 @@ import importlib.metadata -from mcp.server.fastmcp import FastMCP as FastMCP1x +from mcp.server.mcpserver import MCPServer as SDKServer import fastmcp from fastmcp import FastMCP @@ -21,7 +21,7 @@ class TestIconExtraction: async def test_server_icons_and_website(self): """Test that server-level icons and website_url are extracted.""" - from mcp.types import Icon + from mcp_types import Icon mcp = FastMCP( "IconServer", @@ -29,7 +29,7 @@ class TestIconExtraction: icons=[ Icon( src="https://example.com/icon.png", - mimeType="image/png", + mime_type="image/png", sizes=["48x48"], ) ], @@ -55,7 +55,7 @@ class TestIconExtraction: async def test_tool_icons(self): """Test that tool icons are extracted.""" - from mcp.types import Icon + from mcp_types import Icon mcp = FastMCP("ToolIconServer") @@ -63,7 +63,7 @@ class TestIconExtraction: icons=[ Icon( src="https://example.com/calculator.png", - mimeType="image/png", + mime_type="image/png", ) ] ) @@ -92,13 +92,13 @@ class TestIconExtraction: async def test_resource_icons(self): """Test that resource icons are extracted.""" - from mcp.types import Icon + from mcp_types import Icon mcp = FastMCP("ResourceIconServer") @mcp.resource( "resource://data", - icons=[Icon(src="https://example.com/data.png", mimeType="image/png")], + icons=[Icon(src="https://example.com/data.png", mime_type="image/png")], ) def get_data() -> str: """Get data.""" @@ -125,13 +125,13 @@ class TestIconExtraction: async def test_template_icons(self): """Test that resource template icons are extracted.""" - from mcp.types import Icon + from mcp_types import Icon mcp = FastMCP("TemplateIconServer") @mcp.resource( "resource://user/{id}", - icons=[Icon(src="https://example.com/user.png", mimeType="image/png")], + icons=[Icon(src="https://example.com/user.png", mime_type="image/png")], ) def get_user(id: str) -> str: """Get user by ID.""" @@ -162,12 +162,12 @@ class TestIconExtraction: async def test_prompt_icons(self): """Test that prompt icons are extracted.""" - from mcp.types import Icon + from mcp_types import Icon mcp = FastMCP("PromptIconServer") @mcp.prompt( - icons=[Icon(src="https://example.com/analyze.png", mimeType="image/png")] + icons=[Icon(src="https://example.com/analyze.png", mime_type="image/png")] ) def analyze(data: str) -> list: """Analyze data.""" @@ -194,19 +194,19 @@ class TestIconExtraction: async def test_multiple_icons(self): """Test that components with multiple icons extract all of them.""" - from mcp.types import Icon + from mcp_types import Icon mcp = FastMCP( "MultiIconServer", icons=[ Icon( src="https://example.com/icon-48.png", - mimeType="image/png", + mime_type="image/png", sizes=["48x48"], ), Icon( src="https://example.com/icon-96.png", - mimeType="image/png", + mime_type="image/png", sizes=["96x96"], ), ], @@ -239,13 +239,13 @@ class TestIconExtraction: async def test_data_uri_icons(self): """Test that data URI icons are extracted correctly.""" - from mcp.types import Icon + from mcp_types import Icon data_uri = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNk+M9QDwADhgGAWjR9awAAAABJRU5ErkJggg==" mcp = FastMCP("DataURIServer") - @mcp.tool(icons=[Icon(src=data_uri, mimeType="image/png")]) + @mcp.tool(icons=[Icon(src=data_uri, mime_type="image/png")]) def data_uri_tool() -> str: """Tool with data URI icon.""" return "data" @@ -259,12 +259,12 @@ class TestIconExtraction: async def test_icons_in_fastmcp_v1(self): """Test that icons are extracted from FastMCP 1.x servers.""" - from mcp.types import Icon + from mcp_types import Icon - mcp = FastMCP1x("Icon1xServer") + mcp = SDKServer("Icon1xServer") @mcp.tool( - icons=[Icon(src="https://example.com/v1-tool.png", mimeType="image/png")] + icons=[Icon(src="https://example.com/v1-tool.png", mime_type="image/png")] ) def v1_tool() -> str: """Tool in v1 server.""" @@ -277,18 +277,38 @@ class TestIconExtraction: if info.tools[0].icons is not None: assert info.tools[0].icons[0]["src"] == "https://example.com/v1-tool.png" + async def test_website_url_in_fastmcp_v1(self): + """Remote/v1 inspect surfaces the server's website_url. + + The v1 path reads website_url from the SDK v2 snake_case serverInfo + model; a stale camelCase guard silently dropped it. + """ + mcp = SDKServer("Website1xServer", website_url="https://example.com") + + info = await inspect_fastmcp_v1(mcp) + + assert info.website_url == "https://example.com" + + async def test_no_website_url_in_fastmcp_v1(self): + """A v1 server with no website_url reports None rather than raising.""" + mcp = SDKServer("NoWebsite1xServer") + + info = await inspect_fastmcp_v1(mcp) + + assert info.website_url is None + async def test_icons_in_formatted_output(self): """Test that icons appear in formatted JSON output.""" - from mcp.types import Icon + from mcp_types import Icon mcp = FastMCP( "FormattedIconServer", website_url="https://example.com", - icons=[Icon(src="https://example.com/server.png", mimeType="image/png")], + icons=[Icon(src="https://example.com/server.png", mime_type="image/png")], ) @mcp.tool( - icons=[Icon(src="https://example.com/tool.png", mimeType="image/png")] + icons=[Icon(src="https://example.com/tool.png", mime_type="image/png")] ) def icon_tool() -> str: """Tool with icon.""" diff --git a/tests/utilities/test_skills.py b/tests/utilities/test_skills.py index 964ffa021..62268ac91 100644 --- a/tests/utilities/test_skills.py +++ b/tests/utilities/test_skills.py @@ -8,8 +8,7 @@ from pathlib import Path from typing import cast import pytest -from mcp.types import BlobResourceContents, TextResourceContents -from pydantic import AnyUrl +from mcp_types import BlobResourceContents, TextResourceContents from fastmcp import Client, FastMCP from fastmcp.server.providers.skills import SkillsDirectoryProvider @@ -38,12 +37,12 @@ class FakeResourceReader: def text_resource(uri: str, text: str) -> TextResourceContents: - return TextResourceContents(uri=AnyUrl(uri), text=text) + return TextResourceContents(uri=uri, text=text) def blob_resource(uri: str, data: bytes) -> BlobResourceContents: return BlobResourceContents( - uri=AnyUrl(uri), + uri=uri, blob=base64.b64encode(data).decode(), ) diff --git a/tests/utilities/test_tests.py b/tests/utilities/test_tests.py index 03ced8057..6913d1899 100644 --- a/tests/utilities/test_tests.py +++ b/tests/utilities/test_tests.py @@ -66,16 +66,16 @@ class TestHeadlessOAuthCallbackHandler: oauth = self._make_oauth_with_redirect( "https://example.com/callback?code=abc&state=" ) - auth_code, state = await oauth.callback_handler() - assert auth_code == "abc" - assert state == "" + result = await oauth.callback_handler() + assert result.code == "abc" + assert result.state == "" async def test_callback_returns_none_when_state_missing(self): """A truly missing state still returns None (default).""" oauth = self._make_oauth_with_redirect("https://example.com/callback?code=abc") - auth_code, state = await oauth.callback_handler() - assert auth_code == "abc" - assert state is None + result = await oauth.callback_handler() + assert result.code == "abc" + assert result.state is None async def test_callback_uses_blank_error_description_verbatim(self): """When the OAuth provider sends an empty error_description, surface diff --git a/tests/utilities/test_types.py b/tests/utilities/test_types.py index 1f349ebdb..3d366aa64 100644 --- a/tests/utilities/test_types.py +++ b/tests/utilities/test_types.py @@ -3,7 +3,7 @@ import os from typing import Annotated, Any, cast import pytest -from mcp.types import BlobResourceContents, TextResourceContents +from mcp_types import BlobResourceContents, TextResourceContents from pydantic import Field from fastmcp.utilities.types import ( @@ -204,7 +204,7 @@ class TestImage: content = img.to_image_content() assert content.type == "image" - assert content.mimeType == "image/png" + assert content.mime_type == "image/png" assert content.data == base64.b64encode(test_data).decode() # Test with data @@ -212,7 +212,7 @@ class TestImage: content = img.to_image_content() assert content.type == "image" - assert content.mimeType == "image/jpeg" + assert content.mime_type == "image/jpeg" assert content.data == base64.b64encode(test_data).decode() def test_to_image_content_error(self, monkeypatch): @@ -327,7 +327,7 @@ class TestAudio: content = audio.to_audio_content() assert content.type == "audio" - assert content.mimeType == "audio/wav" + assert content.mime_type == "audio/wav" assert content.data == base64.b64encode(test_data).decode() # Test with data @@ -335,7 +335,7 @@ class TestAudio: content = audio.to_audio_content() assert content.type == "audio" - assert content.mimeType == "audio/mp3" + assert content.mime_type == "audio/mp3" assert content.data == base64.b64encode(test_data).decode() def test_to_audio_content_error(self, monkeypatch): @@ -359,7 +359,7 @@ class TestAudio: content = audio.to_audio_content(mime_type="audio/custom") assert content.type == "audio" - assert content.mimeType == "audio/custom" + assert content.mime_type == "audio/custom" assert content.data == base64.b64encode(test_data).decode() @@ -442,7 +442,7 @@ class TestFile: resource = file.to_resource_content() assert resource.type == "resource" - assert resource.resource.mimeType == "text/plain" + assert resource.resource.mime_type == "text/plain" # Convert both to strings for comparison assert str(resource.resource.uri) == file_path.resolve().as_uri() if isinstance(resource.resource, BlobResourceContents): @@ -455,7 +455,7 @@ class TestFile: resource = file.to_resource_content() assert resource.type == "resource" - assert resource.resource.mimeType == "application/pdf" + assert resource.resource.mime_type == "application/pdf" # Convert URI to string for comparison assert str(resource.resource.uri) == "file:///resource.pdf" if isinstance(resource.resource, BlobResourceContents): @@ -469,7 +469,7 @@ class TestFile: assert resource.type == "resource" # Should be TextResourceContents for text/plain assert isinstance(resource.resource, TextResourceContents) - assert resource.resource.mimeType == "text/plain" + assert resource.resource.mime_type == "text/plain" assert resource.resource.text == "hello world" def test_to_resource_content_error(self, monkeypatch): @@ -490,7 +490,7 @@ class TestFile: file = File(path=file_path) resource = file.to_resource_content(mime_type="application/custom") - assert resource.resource.mimeType == "application/custom" + assert resource.resource.mime_type == "application/custom" class TestReplaceType: diff --git a/uv.lock b/uv.lock index a69f50d9f..d78c55152 100644 --- a/uv.lock +++ b/uv.lock @@ -10,11 +10,13 @@ resolution-markers = [ ] [options] -exclude-newer = "0001-01-01T00:00:00Z" # This has no effect and is included for backwards compatibility when using relative exclude-newer values. +exclude-newer = "2026-06-29T14:57:29.757967Z" exclude-newer-span = "P1W" [options.exclude-newer-package] +mcp-types = false prefab-ui = false +mcp = false [manifest] members = [ @@ -953,6 +955,7 @@ requires-dist = [{ name = "fastmcp-slim", extras = ["client", "server"], editabl name = "fastmcp-slim" source = { editable = "fastmcp_slim" } dependencies = [ + { name = "mcp-types" }, { name = "platformdirs" }, { name = "pydantic", extra = ["email"] }, { name = "pydantic-settings" }, @@ -1044,20 +1047,21 @@ requires-dist = [ { name = "jsonref", marker = "extra == 'gemini'", specifier = ">=1.1.0" }, { name = "jsonref", marker = "extra == 'server'", specifier = ">=1.1.0" }, { name = "jsonschema-path", marker = "extra == 'server'", specifier = ">=0.3.4" }, - 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