* Fix upgrade static analysis
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* Preserve concrete transport return types
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* Avoid widening transport return types
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* Model transforming transport return types
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* Exclude standalone screenshot examples from ty
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A FastMCP client now transparently completes tasked tools/call: the tasks
ClientExtension advertises the capability and claims the CreateTaskResult, and
the resolver drives the tasks/get poll loop to completion, answering in-task
input through the client's elicitation handler and returning the tool's real
result. call_tool is transparent, call_tool_mcp exposes the raw result, and
call_tool_task yields a Task handle. The client half moves to fastmcp-tasks;
the [tasks] client extension auto-wires into Client (ProxyClient opts out).
Co-Authored-By: Claude <noreply@anthropic.com>
TasksExtension serves io.modelcontextprotocol/tasks on the extension API:
a decide-and-task tools/call interceptor (era-gated to modern connections),
tasks/get with inlined results and inputRequests, tasks/update delivering
poll-based in-task elicitation, tasks/cancel, durable creation, and
auth-scoped task isolation. Wire models validate against the vendored
ext-tasks schema. Worker-side Context hooks are refcounted so sibling
servers cannot strand each other's workers.
Co-Authored-By: Claude <noreply@anthropic.com>
Engine modules (keys, context snapshot, docket lifespan, worker CLI,
client handles) move intact; SEP-1686 wire modules park in _legacy_wire
for adaptation to SEP-2663. Core keeps task=True declaration on tools
only and raises at serve time until the tasks extension is registered.
Co-Authored-By: Claude <noreply@anthropic.com>
* Restore upgraded dependency checks
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* Clarify settings loading and teardown logging
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* Align ty checks on the upgraded version
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* Preserve simultaneous caller cancellation
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* Add examples/ to ty static-analysis gate
* Fix example type errors and stale SDK idioms for ty
* Use typing_extensions.TypedDict for the quiz tool-param type
Question is a take_quiz parameter, so FastMCP builds a Pydantic schema
for it; typing.TypedDict raises PydanticUserError on Python 3.10/3.11
(only 3.12+ accepts it). ty and 3.12 runs miss this, so it slipped in.
* Guard get_access_token() None case in huggingface_oauth example
Caught by the ty gate this PR adds: the example, merged separately,
had never been type-checked against examples/. Matches the existing
aws_oauth/keycloak_oauth pattern.
* Print actual YAML text in custom serializer example
* Restore task snapshot via a worker-level dependency
`get_access_token()` returned `None` inside background tasks whenever
`FASTMCP_DOCKET_URL` pointed at a `redis+cluster://` URL. The write side
was fine — it went through `docket.redis()`, which is cluster-aware —
but fastmcp kept a parallel sync Redis client just to read the snapshot
back, and `Redis.from_url()` rejects the cluster scheme.
Docket 0.19.1 ships worker-level dependencies that resolve per task in
the same asyncio.Task as user code, so ContextVars propagate cleanly.
That lets us load the snapshot once via `restore_task_snapshot` and
drop the sync Redis path entirely. Sync helpers like
`get_access_token()` and `get_http_request()` now just read a
ContextVar; Docket is the sole Redis consumer.
Closes#3897
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* Revert TaskKey stub to a plain return
NotImplementedError would fire at module import if anything evaluated
the default; a no-op stub keeps the module usable without the
fastmcp[tasks] extra, which is what we want.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
* Fix broken code examples in docs
- Tag error output blocks as ```text instead of ```python (anthropic,
openai integration docs + v2 mirrors)
- Quote unquoted URL in Descope config example (+ v2 mirror)
- Fix GoogleGenAISamplingHandler → GoogleGenaiSamplingHandler casing
in sampling docs
- Fix import path: handlers.GoogleGenaiSamplingHandler →
handlers.google_genai.GoogleGenaiSamplingHandler in v3-features
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Fix remaining broken doc examples and add skip tags for false positives
- BearerTokenAuth → StaticTokenVerifier in deployment/http.mdx
- providers.oauth → server.auth import in authentication.mdx
- ListToolsNext → updated list_tools API in v3-features.mdx
- OAuthClientProvider → OAuth in v2/storage-backends.mdx
- Add test="skip" for upgrade guides, contrib placeholders, f-string backticks
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Ratchet doc example baselines to zero
All 1444 examples now pass syntax and import checks.
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Add pytest-examples dev dep, fix client_id in StaticTokenVerifier example, commit missed openapi fixes
- Add pytest-examples to dev dependencies (fixes CI ModuleNotFoundError)
- Include required client_id in StaticTokenVerifier token payload
- Commit previously unstaged HTTPRoute import fixes in openapi.mdx
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Update deprecated import paths across docs
- fastmcp.server.openapi → fastmcp.server.providers.openapi
- fastmcp.server.proxy → fastmcp.server.providers.proxy
- fastmcp.server.apps → fastmcp.apps
- Tag upgrade guide "Before" examples with test="skip"
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Enables stricter type checking by promoting rules that default to
ignore: division-by-zero, possibly-missing-attribute,
possibly-missing-import, possibly-unresolved-reference,
unsupported-dynamic-base, unsupported-operator, unused-ignore-comment.
6 of the 7 rules had zero violations. possibly-unresolved-reference
had 9 (5 in src/, 3 in tests/, 1 walrus-operator false positive
suppressed with ty: ignore).
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
pydocket 0.19.0 fixes the fakeredis 2.35.0 FakeConnection rename
internally, so we no longer need to carry the fakeredis ceiling
ourselves. Removes the direct fakeredis[lua]<2.35.0 dependency from the
tasks extra entirely — it's just a transitive of pydocket now.
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Comprehensive MCP Apps docs, string CallTool resolution, bump prefab-ui >=0.13.0
Rewrites the apps documentation as a learning journey: overview → Prefab apps
→ FastMCPApp → patterns → dev tools → custom HTML. Adds a new FastMCPApp page
covering composable apps with @app.tool()/@app.ui(), CallTool, forms, actions,
and composition. Teaches Rx() and set_initial_state() as the primary state API.
Adds string-based CallTool resolution so CallTool("save_contact") resolves to
the tool's global key, matching callable ref behavior. Requires prefab-ui 0.13.0
which passes strings through the tool resolver.
* Detect ambiguous string CallTool resolution across apps
* Simplify string name registry to plain dict (last-write-wins)
* Add FastMCPApp — a Provider for composable MCP applications
* Wire Prefab callable resolver via to_json(tool_resolver=) parameter
* Remove inspect.signature compat check, use try/except until prefab 0.10.0
* Address review: fix add_tool registry gaps, normalize auth errors, bump prefab to 0.10.0
* Register global key after _add_component succeeds
* Simplify: extract decorator dispatch, use get_fastmcp_meta, expose get_global_tool
* Remove prek from Marvin workflows
These workflows run Claude to respond to /marvin mentions — linting
the repo is unnecessary and fails without renderer deps installed.
* Return ResolvedTool from callable resolver, add contacts example
The callable resolver now returns ResolvedTool (from prefab_ui) instead of a
plain string, carrying metadata like unwrap_result that the renderer needs to
correctly handle structuredContent envelopes. The unwrap_result flag is derived
from the tool's x-fastmcp-wrap-result output schema marker.
* Bump prefab-ui requirement to >=0.11.0
* Remove stale ty ignore comments now that prefab-ui 0.11 is published
* Add fastmcp dev apps command with browser UI preview
* Improve fastmcp dev apps: dropdown picker, reload flag, process cleanup
- Replace Tabs with Pages+Select for tool picker (Rx-based reactive state)
- Add --reload/--no-reload flag (default: True) to fastmcp dev apps
- Kill entire process group on shutdown so port 8000 is freed properly
- Suppress uvicorn websockets deprecation warning (websockets-sansio)
- Bump prefab-ui to >=0.11.1 (fixes get_renderer_head bug in 0.11.0)
- Add farewell tool to greet_server example for multi-tool testing
* Add docs for fastmcp dev apps command
* Fix orphaned server on startup failure, guard Unix-only signal handling
* Show tool title in picker, remove editable prefab source
* Bump prefab-ui to >=0.11.2
* Fail fast when prefab-ui is not installed
* Add apps/development docs, link from prefab and sidebar
* Fix optional field defaults, fail with non-zero on startup timeout
