* fix: handle non-TextContent error responses in ProxyTool
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* Avoid serializing binary content into ToolError messages
Use type name instead of str(content) to prevent dumping
large base64 payloads into error messages.
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* ruff format fix
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Delete entirely commented-out test_run_server.py (99 lines dead code)
- Fix test_pydantic_model_with_stringified_json_no_strict: replace
try/except-both-branches-pass with clear pytest.raises assertion
- Fix test_path_traversal_blocked: remove dead assertions after
pytest.raises (lines after raise never execute)
Error handling middleware test fixes are in a separate PR (#3858)
which also fixes the underlying RetryMiddleware bug.
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Replaces the ___ separator for FastMCPApp backend tool routing with a
deterministic hash(app_name, tool_name) prefix, and replaces the shared
singleton prefab renderer resource with per-tool resources synthesized
on demand.
Backend tools are now callable via <hash>_<local_name> instead of
<app_name>___<local_name>. The dispatcher walks the provider tree
recursively via get_tool_by_hash (same pattern as get_app_tool).
Each prefab tool gets its own renderer resource at
ui://prefab/tool/<hash>/renderer.html with per-tool CSP — fixing the
bug where PrefabAppConfig(csp=...) never actually applied.
Closes#3735, closes#3805
- Detect async/sync generators after tool execution and materialize
into lists before the result conversion pipeline processes them
- Generator materialization runs inside timeout scope so slow generators
respect the configured timeout
- Handle bytes return types: UTF-8 bytes as text, non-UTF-8 as base64
- Suppress output_schema for bytes return types (can't be structured JSON)
- Catch UnicodeDecodeError alongside PydanticSerializationError in
convert_result for robustness
Fixes#3829
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix: resolve OpenAPI 3.x server variables in _create_default_client
When an OpenAPI spec defines server variables (e.g. `https://{region}.api.example.com/v1`),
the default values are now substituted before constructing the httpx client base URL.
Previously, the URL was used as-is, causing all requests to fail for specs that use
server variable templating.
Fixes#1681
* fix: use str.replace instead of format_map for server variable substitution
format_map applies Python string formatting rules, so variable names
like {api.version} would be treated as attribute access and raise errors.
Literal token replacement handles all valid OpenAPI variable names safely.
* pin pydantic-monty to 0.0.8
* rename tool/prompt/resource base modules to avoid decorator name shadow
* add sys.modules shims for old submodule import paths
* preserve original module paths in deprecation warnings
* clarify when sys.modules shims can be removed
* Propagate x-fastmcp-wrap-result flag in tool result _meta
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* Skip listTools round-trip when _meta has x-fastmcp-wrap-result
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* Use namespaced meta key: {"fastmcp": {"wrap_result": true}}
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* Clean up _parse_call_tool_result: hoist cast import, document local CallToolResult import, extract fastmcp_meta
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* Merge _meta in tasks result handler instead of overwriting
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* Preserve type validation in meta-based unwrap path
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* Fix type validation for wrapped task results, guard non-dict meta
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Co-authored-by: Claude <noreply@anthropic.com>
* fix: cache component lists in ProxyProvider to avoid redundant backend connections
Every call_tool through a proxy was triggering _list_tools() to resolve
the tool by name, opening a full MCP session just for the lookup, then
opening a second session for the actual execution. This caches component
lists on the ProxyProvider with a configurable TTL (default 300s),
cutting backend handshakes in half for repeated calls.
* docs: document component caching and session reuse for proxy providers
* fix: add sleep in cache TTL test for Windows clock resolution
* docs: clarify cache scope and dynamic backend guidance
Message.content now accepts ImageContent and AudioContent in addition to
TextContent and EmbeddedResource, matching MCP's ContentBlock type. This
fixes ProxyPrompt.render() silently JSON-serializing image/audio content
instead of preserving it.
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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Increase performance test threshold from 100ms to 1.0s. Windows CI runners
are slower than Linux, and the 100ms threshold was too tight. The test's
intent is to catch obvious regressions (e.g., accidentally re-introducing
code generation), not to precisely benchmark.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* fix: restore request context in StatefulProxyClient handlers
StatefulProxyClient reuses sessions across requests, so its receive-loop
task inherits a stale request_ctx ContextVar from the first request.
Server-initiated messages (elicitation, sampling, etc.) that depend on
related_request_id routing get sent to a closed stream and hang forever.
Closes#3169
* chore: Update SDK documentation
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Co-authored-by: marvin-context-protocol[bot] <225465937+marvin-context-protocol[bot]@users.noreply.github.com>
Rename Visibility to Enabled, collapse VisibilityRule into the transform,
and move enabled filtering from Provider to Server level so server-level
transforms can override provider-level disables.
