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Merged
maxisbey merged 4 commits into from
Nov 13, 2025
Merged

Refactor func_metadata() implementation #1496

maxisbey merged 4 commits into from
Nov 13, 2025

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@Viicos
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@Viicos Viicos commented Oct 18, 2025 •
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Motivation and Context

This is a first step in adding support for Pydantic 2.12 and Python 3.14. It avoids relying on patterns that we discourage using in Pydantic (mostly around the FieldInfo class), and removes usage of private utilities.

How Has This Been Tested?

Breaking Changes

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

Viicos
Viicos commented Oct 18, 2025
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pyproject.toml
Comment on lines +36 to +38
"typing-extensions>=4.9.0",
"typing-inspection>=0.4.1",
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@Viicos Viicos Oct 18, 2025

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typing-extensions is already used in the project, but not declared as an explicit dependency. 4.9.0 is the oldest version with (proper) support for typing_extensions.deprecated.

typing-inspection is already a Pydantic dependency, so nothing new added here.

src/mcp/server/fastmcp/utilities/func_metadata.py
Comment on lines -471 to -515
def _get_typed_signature(call: Callable[..., Any]) -> inspect.Signature:
"""Get function signature while evaluating forward references"""
signature = inspect.signature(call)
globalns = getattr(call, "__globals__", {})
typed_params = [
inspect.Parameter(
name=param.name,
kind=param.kind,
default=param.default,
annotation=_get_typed_annotation(param.annotation, globalns),
)
for param in signature.parameters.values()
]
typed_return = _get_typed_annotation(signature.return_annotation, globalns)
typed_signature = inspect.Signature(typed_params, return_annotation=typed_return)
return typed_signature
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@Viicos Viicos Oct 18, 2025

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Removed, we can just use inspect.get_annotations() with eval_str=True.

It also enables more use cases to be supported, e.g.:

from __future__ import annotations

def func[T](a: T): ...

from_metadata(func)  # Used to raise

Let me know if I should add a test for this.

Kludex
Kludex previously approved these changes Oct 22, 2025
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This PR keeps the support for Pydantic 2.11.

@Viicos is maintaining Pydantic, so he knows stuff.

@Viicos Viicos force-pushed the refactor-func-metadata branch 2 times, most recently from 5dff9fa to cf3ae5c Compare October 22, 2025 14:52
maxisbey
maxisbey requested changes Oct 22, 2025
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src/mcp/server/fastmcp/utilities/func_metadata.py Outdated
Comment on lines 267 to 270
if return_type_expr is UNKNOWN and structured_output is True:
# `return_type_expr` is `UNKNOWN` when a bare type qualifier is used (unlikely to happen as a return annotation
# because it doesn't make any sense, but technically possible).
raise InvalidSignature(f"Function {func.__name__}: return annotation required for structured output")
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do we already have a unit test that covers this? otherwise would be good to add one

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@Viicos Viicos Oct 24, 2025

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I'll add one.

src/mcp/server/fastmcp/utilities/func_metadata.py Outdated
Comment on lines 288 to 301
# Reconstruct the original annotation, by preserving the remaining metadata,
# i.e. from `Annotated[CallToolResult, ReturnType, Gt(1)]` to
# `Annotated[ReturnType, Gt(1)]`:
original_annotation = Annotated[(return_type_expr, *inspected_return_ann.metadata[1:])]
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if I'm reading this right, does that mean the current code on main would strip the extra metadata and cause different Pydantic models to be created? if so a unit test for this seems like a good idea

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@Viicos Viicos Oct 24, 2025 •
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The code on main behaves as expected (in most cases, see here where it doesn't on main and on this PR), because it is constructing a FieldInfo instance from the annotation, and passing it again as Annotated[ann, field_info_instance], which is an undocumented pattern although kind of works.

I'll add tests related to this.

@felixweinberger felixweinberger added enhancement needs more work Not ready to be merged yet, needs additional follow-up from the author(s). labels Oct 23, 2025
@medaminezghal medaminezghal mentioned this pull request Nov 5, 2025
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@Viicos Viicos force-pushed the refactor-func-metadata branch from 961b3cc to 2b607bc Compare November 7, 2025 09:36
@felixweinberger felixweinberger added enhancement Request for a new feature that's not currently supported and removed enhancement deprecated labels Nov 12, 2025
@Viicos Viicos mentioned this pull request Nov 13, 2025
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@maxisbey maxisbey force-pushed the refactor-func-metadata branch from 2b607bc to 1e0e002 Compare November 13, 2025 19:58
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maxisbey reviewed Nov 13, 2025
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@maxisbey maxisbey enabled auto-merge (squash) November 13, 2025 20:15
@maxisbey maxisbey merged commit 116c13e into modelcontextprotocol:main Nov 13, 2025
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@Viicos Viicos deleted the refactor-func-metadata branch November 13, 2025 20:22
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Viicos commented Nov 13, 2025 •
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Thanks @maxisbey (sorry I'm out for some days couldn't rebase).

LucaButBoring pushed a commit to LucaButBoring/mcp-python-sdk that referenced this pull request Nov 17, 2025
@Viicos @LucaButBoring
Refactor func_metadata() implementation (modelcontextprotocol#1496)
b4453d5
rbehal pushed a commit to gumloop/gumloop-mcp that referenced this pull request Dec 9, 2025
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[MCP-266] Sync gumloop-mcp with upstream and add/fix tests (#13)
715857d 
* Add regression test for stateless request memory cleanup (modelcontextprotocol#1140)

* Implement RFC9728 - Support WWW-Authenticate header by MCP client (modelcontextprotocol#1071)

* Add streamable HTTP starlette example to Python SDK docs (modelcontextprotocol#1111)

* fix markdown error in README in main (modelcontextprotocol#1147)

* README - replace code snippets with examples - add lowlevel to snippets (modelcontextprotocol#1150)

* README - replace code snippets with examples - streamable http (modelcontextprotocol#1155)

* chore: don't allow users to create issues outside the templates (modelcontextprotocol#1163)

* Tests(cli): Add coverage for helper functions (modelcontextprotocol#635)

* Docs: Update CallToolResult parsing in README (modelcontextprotocol#812)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* docs: add pre-commit install guide on CONTRIBUTING.md (modelcontextprotocol#995)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* fix flaky fix-test_streamablehttp_client_resumption test (modelcontextprotocol#1166)

* README - replace code snippets with examples -- auth examples (modelcontextprotocol#1164)

* Support falling back to OIDC metadata for auth (modelcontextprotocol#1061)

* Add CODEOWNERS file for sdk (modelcontextprotocol#1169)

* fix flaky test test_88_random_error (modelcontextprotocol#1171)

* Make sure `RequestId` is not coerced as `int` (modelcontextprotocol#1178)

* Fix: Replace threading.Lock with anyio.Lock for Ray deployment compatibility (modelcontextprotocol#1151)

* fix: fix OAuth flow request object handling (modelcontextprotocol#1174)

* update codeowners group (modelcontextprotocol#1191)

* fix: perform auth server metadata discovery fallbacks on any 4xx (modelcontextprotocol#1193)

* server: skip duplicate response on CancelledError (modelcontextprotocol#1153)

Co-authored-by: ihrpr <inna@anthropic.com>

* Unpack settings in FastMCP (modelcontextprotocol#1198)

* chore: Remove unused prompt_manager.py file (modelcontextprotocol#1229)

Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>

* Improved supported for ProtectedResourceMetadata (modelcontextprotocol#1235)

Co-authored-by: Paul Carleton <paulcarletonjr@gmail.com>

* chore: Remove unused variable notification_options (modelcontextprotocol#1238)

* Improve README around the Context object (modelcontextprotocol#1203)

* fix: allow to pass `list[str]` to `token_endpoint_auth_signing_alg_values_supported` (modelcontextprotocol#1226)

* Remove strict validation on `response_modes_supported` member of `OAuthMetadata` (modelcontextprotocol#1243)

* Add pyright strict mode on the whole project (modelcontextprotocol#1254)

* Consistent casing for default headers Accept and Content-Type (modelcontextprotocol#1263)

* Update dependencies and fix type issues (modelcontextprotocol#1268)

Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

* fix: prevent async generator cleanup errors in StreamableHTTP transport (modelcontextprotocol#1271)

Co-authored-by: David Soria Parra <167242713+dsp-ant@users.noreply.github.com>

* chore: uncomment .idea/ in .gitignore (modelcontextprotocol#1287)

Co-authored-by: Claude <noreply@anthropic.com>

* docs: clarify streamable_http_path configuration when mounting servers (modelcontextprotocol#1172)

* feat: Add CORS configuration for browser-based MCP clients (modelcontextprotocol#1059)

Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Added Audio to FastMCP (modelcontextprotocol#1130)

* fix: avoid uncessary retries in OAuth authenticated requests (modelcontextprotocol#1206)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Add PATHEXT to default STDIO env vars in windows (modelcontextprotocol#1256)

* fix: error too many values to unpack (expected 2) (modelcontextprotocol#1279)

Signed-off-by: San Nguyen <vinhsannguyen91@gmail.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* SDK Parity: Avoid Parsing Server Response for non-JsonRPCMessage Requests (modelcontextprotocol#1290)

* types: Setting default value for method: Literal (modelcontextprotocol#1292)

* changes structured temperature to not deadly (modelcontextprotocol#1328)

* Update simple-resource example to use non-deprecated read_resource return type (modelcontextprotocol#1331)

Co-authored-by: Claude <noreply@anthropic.com>

* docs: Update README to include link to API docs for modelcontextprotocol#1329 (modelcontextprotocol#1330)

* Allow ping requests before initialization (modelcontextprotocol#1312)

* Python lint: Ruff rules for pylint and code complexity (modelcontextprotocol#525)

* Fix context injection for resources and prompts (modelcontextprotocol#1336)

* fix(fastmcp): propagate mimeType in resource template list (modelcontextprotocol#1186)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* fix: allow elicitations accepted without content (modelcontextprotocol#1285)

Co-authored-by: Olivier Schiavo <olivier.schiavo@wengo.com>

* Use --frozen in pre-commit config (modelcontextprotocol#1375)

* Return HTTP 403 for invalid Origin headers (modelcontextprotocol#1353)

* Add test for ProtectedResourceMetadataParsing (modelcontextprotocol#1236)

Co-authored-by: Paul Carleton <paulcarletonjr@gmail.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Fastmcp logging progress example (modelcontextprotocol#1270)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* feat: add paginated list decorators for prompts, resources, and tools (modelcontextprotocol#1286)

Co-authored-by: Claude <noreply@anthropic.com>

* Remove "unconditionally" from conditional description (modelcontextprotocol#1289)

* Use streamable-http consistently in examples (modelcontextprotocol#1389)

* feat: Add SDK support for SEP-1034 default values in elicitation schemas (modelcontextprotocol#1337)

Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Implementation of SEP 973 - Additional metadata + icons support (modelcontextprotocol#1357)

* Add error log for client stdio (modelcontextprotocol#924)

Co-authored-by: Your Name <youremail@yourdomain.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Accept additional response_types values from OAuth servers (modelcontextprotocol#1323)

* Issue 1379 patch - Fix MCP server OAuth not working with Visual Studio Code and others with extra grant_types (modelcontextprotocol#1380)

* Add comprehensive Unicode tests for streamable HTTP transport (modelcontextprotocol#1381)

* Update Icon.sizes to use string array format (modelcontextprotocol#1411)

* Delete CODEOWNERS to eliminate notification overload (modelcontextprotocol#1413)

* fix: fix the system message in simple-chatbot example (modelcontextprotocol#1394)

* fix: improve misleading warning for progress callback exceptions (modelcontextprotocol#775)

* fix: catch and rethrow SSEError during SSE connection establishment (modelcontextprotocol#975)

Co-authored-by: zhangchuanhui <zhangchal@digitalchina.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Add icons support for ResourceTemplate (modelcontextprotocol#1412)

* Add documentation structure (modelcontextprotocol#1425)

* Add documentation about testing (modelcontextprotocol#1426)

* Improve OAuth protected resource metadata URL construction per RFC 9728 (modelcontextprotocol#1407)

* feat: add ability to remove tools (modelcontextprotocol#1322)

Co-authored-by: David Soria Parra <167242713+dsp-ant@users.noreply.github.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

* Update README to link to Python SDK documentation (modelcontextprotocol#1430)

* fix: update CLAUDE.md to remove auto-addition of reviewers. (modelcontextprotocol#1431)

* [client] Implement MCP OAuth scope selection and step-up authorization (modelcontextprotocol#1324)

* Handles message type Exception in lowlevel/server.py _handle_message function. Mentioned as TODO on line 528. (modelcontextprotocol#786)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Fix workspace configuration error with structured_output_lowlevel.py  (modelcontextprotocol#1471)

Co-authored-by: lorenss-m <saeclmusic@gmail.com>

* fix: Remove unnecessary constructor from ResourceServerSettings (modelcontextprotocol#1424)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* feat: add resource annotations support to FastMCP (modelcontextprotocol#1468)

* fix: send params as empty object for list methods without cursor (modelcontextprotocol#1453)

* fix: Set the Server session initialization state immediately after respond… (modelcontextprotocol#1478)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* feat: add tool metadata in FastMCP.tool decorator (modelcontextprotocol#1463)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* Make client examples workspaces to reflect package code (modelcontextprotocol#1466)

* Expose RequestParams._meta in ClientSession.call_tool (modelcontextprotocol#1231)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Allow CallToolResult to be returned directly to support _meta field for OpenAI Apps (modelcontextprotocol#1459)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* fix: uv CVE-2025-62518 astral-tokio-tar issue GHSA-j5gw-2vrg-8fgx (modelcontextprotocol#1505)

* fix: use proper dependency resolution in CI (modelcontextprotocol#1507)

* Upgrade GitHub Actions (modelcontextprotocol#1473)

* test: use errno.ENOENT for command not found assertion (modelcontextprotocol#1498)

* Replace deprecated dev-dependencies with dependency-groups (modelcontextprotocol#1488)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* update uv to 0.9.5 (modelcontextprotocol#1510)

* Relax Accept header requirement for JSON-only responses (modelcontextprotocol#1500)

* fix: replace deprecated dev-dependencies in examples/clients (modelcontextprotocol#1518)

* fix: Update spec links to new modelcontextprotocol.io location (modelcontextprotocol#1491)

* fix: Replace fixed sleep with active server readiness check in SSE tests (modelcontextprotocol#1526)

* fix: Replace arbitrary sleeps with active server readiness checks in tests (modelcontextprotocol#1527)

Co-authored-by: Claude <noreply@anthropic.com>

* Fix flaky timeout test in test_88_random_error (modelcontextprotocol#1525)

* fix: Replace remaining manual server polling with wait_for_server helper (modelcontextprotocol#1529)

* Implement RFC 7523 JWT flows (modelcontextprotocol#1247)

Co-authored-by: Yann Jouanin <yann.jouanin@valueandco.com>

* Fix pyright error and replace wildcard import with explicit imports (modelcontextprotocol#1532)

* Fix auth client example URL handling for oauth provider (modelcontextprotocol#1549)

* docs: use article "an" before "MCP" instead of "a" (modelcontextprotocol#1558)

* Update Starlette to 0.49.1 in uv.lock (modelcontextprotocol#1559)

* Fix typo in `ClientSessionGroup` doc string (modelcontextprotocol#1572)

* Implement SEP-985: OAuth Protected Resource Metadata discovery fallback (modelcontextprotocol#1548)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Paul Carleton <paulc@anthropic.com>

* Add --frozen flag to uv run commands in Claude config (modelcontextprotocol#1583)

* Add get_server_capabilities() to ClientSession (modelcontextprotocol#1588)

* Add everything-server for comprehensive MCP conformance testing (modelcontextprotocol#1587)

* Get baseline 100% clean coverage (modelcontextprotocol#1553)

* Add end-of-file-fixer pre-commit hook (modelcontextprotocol#1610)

* Add coverage baseline commit to git-blame-ignore (modelcontextprotocol#1613)

* Add SEP-1034 conformance test support to everything-server (modelcontextprotocol#1604)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* refactor: extract OAuth helper functions and simplify provider state (modelcontextprotocol#1586)

* Add client_id_metadata_document_supported to OAuthMetadata (modelcontextprotocol#1603)

* Fix OAuth discovery fallback and URL ordering (modelcontextprotocol#1624)

* Refactor `func_metadata()` implementation (modelcontextprotocol#1496)

* Fix CI highest resolution test to actually test highest versions (modelcontextprotocol#1609)

* feat: Pass through and expose additional parameters in `ClientSessionGroup.call_tool` and `.connect_to_server` (modelcontextprotocol#1576)

* fix get_client_metadata_scopes on 401 (modelcontextprotocol#1631)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* chore: Lazy import `jsonschema` library (modelcontextprotocol#1596)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* docs: Update examples to use stateless HTTP with JSON responses (modelcontextprotocol#1499)

* Add tests for JSON Schema 2020-12 field preservation (SEP-1613) (modelcontextprotocol#1649)

* Add client_secret_basic authentication support (modelcontextprotocol#1334)

Co-authored-by: Paul Carleton <paulc@anthropic.com>

* Implement SEP-1577 - Sampling With Tools (modelcontextprotocol#1594)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Claude <noreply@anthropic.com>

* SEP-1330: Elicitation Enum Schema Improvements and Standards Compliance (modelcontextprotocol#1246)

Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* [auth][conformance] add conformance auth client (modelcontextprotocol#1640)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Implement SEP-986: Tool name validation (modelcontextprotocol#1655)

* fix: url for spec (modelcontextprotocol#1659)

* feat: implement SEP-991 URL-based client ID (CIMD) support (modelcontextprotocol#1652)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Update doc string on custom_route (modelcontextprotocol#1660)

* Implement SEP-1036: URL mode elicitation for secure out-of-band interactions (modelcontextprotocol#1580)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Skip empty SSE data to avoid parsing errors (modelcontextprotocol#1670)

* SEP-1686: Tasks (modelcontextprotocol#1645)

* Add on_session_created callback option (modelcontextprotocol#1710)

* Add SSE polling support (SEP-1699) (modelcontextprotocol#1654)

* Support client_credentials flow with JWT and Basic auth (modelcontextprotocol#1663)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* feat: backwards-compatible create_message overloads for SEP-1577 (modelcontextprotocol#1713)

* Merge commit from fork

* Auto-enable DNS rebinding protection for localhost servers

When a FastMCP server is created with host="127.0.0.1" or "localhost"
and no explicit transport_security is provided, automatically enable
DNS rebinding protection. Both 127.0.0.1 and localhost are allowed
as valid hosts/origins since clients may use either to connect.

* Add tests for auto DNS rebinding protection on localhost

Tests verify that:
- Protection auto-enables for host=127.0.0.1
- Protection auto-enables for host=localhost
- Both 127.0.0.1 and localhost are in allowed hosts/origins
- Protection does NOT auto-enable for other hosts (e.g., 0.0.0.0)
- Explicit transport_security settings are not overridden

* Add IPv6 localhost (::1) support for DNS rebinding protection

Extend auto-enable DNS rebinding protection to also cover IPv6
localhost. When host="::1", protection is now auto-enabled with
appropriate allowed hosts ([::1]:*) and origins (http://[::1]:*).

* Fix import ordering in test file

* chore: update LATEST_PROTOCOL_VERSION to 2025-11-25 (modelcontextprotocol#1715)

* fix: add lifespan context manager to StreamableHTTP mounting examples (modelcontextprotocol#1669)

Co-authored-by: TheMailmans <tyler@example.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

* fix: handle ClosedResourceError in StreamableHTTP message router (modelcontextprotocol#1384)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

* fix: skip priming events and close_sse_stream for old protocol versions (modelcontextprotocol#1719)

* refactor(auth): remove unused _register_client method (modelcontextprotocol#1748)

* [MCP-266] Add tests for Gumloop server extensions

* Fix uv workspace config for gumloop-mcp package name

* Sync with upstream MCP SDK and fix merge conflicts

* Fix tool cache timing and missing properties check in server.py

* Fix coverage and add proper type annotations for Gumloop extensions

* Version up

* Skip README code example tests (Gumloop README has no code snippets)

---------

Signed-off-by: San Nguyen <vinhsannguyen91@gmail.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
Co-authored-by: yurikunash <143175350+yurikunash@users.noreply.github.com>
Co-authored-by: Pamela Fox <pamela.fox@gmail.com>
Co-authored-by: Inna Harper <inna.hrpr@gmail.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Ian Davenport <49379192+davenpi@users.noreply.github.com>
Co-authored-by: Dagang Wei <functicons@gmail.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Stanley Law <stanleylkal@gmail.com>
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rbehal added a commit to gumloop/gumloop-mcp that referenced this pull request Dec 10, 2025
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[MCP-266] Sync gumloop-mcp with upstream and add/fix tests (#14)
677a559 
* Add regression test for stateless request memory cleanup (modelcontextprotocol#1140)

* Implement RFC9728 - Support WWW-Authenticate header by MCP client (modelcontextprotocol#1071)

* Add streamable HTTP starlette example to Python SDK docs (modelcontextprotocol#1111)

* fix markdown error in README in main (modelcontextprotocol#1147)

* README - replace code snippets with examples - add lowlevel to snippets (modelcontextprotocol#1150)

* README - replace code snippets with examples - streamable http (modelcontextprotocol#1155)

* chore: don't allow users to create issues outside the templates (modelcontextprotocol#1163)

* Tests(cli): Add coverage for helper functions (modelcontextprotocol#635)

* Docs: Update CallToolResult parsing in README (modelcontextprotocol#812)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* docs: add pre-commit install guide on CONTRIBUTING.md (modelcontextprotocol#995)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* fix flaky fix-test_streamablehttp_client_resumption test (modelcontextprotocol#1166)

* README - replace code snippets with examples -- auth examples (modelcontextprotocol#1164)

* Support falling back to OIDC metadata for auth (modelcontextprotocol#1061)

* Add CODEOWNERS file for sdk (modelcontextprotocol#1169)

* fix flaky test test_88_random_error (modelcontextprotocol#1171)

* Make sure `RequestId` is not coerced as `int` (modelcontextprotocol#1178)

* Fix: Replace threading.Lock with anyio.Lock for Ray deployment compatibility (modelcontextprotocol#1151)

* fix: fix OAuth flow request object handling (modelcontextprotocol#1174)

* update codeowners group (modelcontextprotocol#1191)

* fix: perform auth server metadata discovery fallbacks on any 4xx (modelcontextprotocol#1193)

* server: skip duplicate response on CancelledError (modelcontextprotocol#1153)

Co-authored-by: ihrpr <inna@anthropic.com>

* Unpack settings in FastMCP (modelcontextprotocol#1198)

* chore: Remove unused prompt_manager.py file (modelcontextprotocol#1229)

Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>

* Improved supported for ProtectedResourceMetadata (modelcontextprotocol#1235)

Co-authored-by: Paul Carleton <paulcarletonjr@gmail.com>

* chore: Remove unused variable notification_options (modelcontextprotocol#1238)

* Improve README around the Context object (modelcontextprotocol#1203)

* fix: allow to pass `list[str]` to `token_endpoint_auth_signing_alg_values_supported` (modelcontextprotocol#1226)

* Remove strict validation on `response_modes_supported` member of `OAuthMetadata` (modelcontextprotocol#1243)

* Add pyright strict mode on the whole project (modelcontextprotocol#1254)

* Consistent casing for default headers Accept and Content-Type (modelcontextprotocol#1263)

* Update dependencies and fix type issues (modelcontextprotocol#1268)

Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

* fix: prevent async generator cleanup errors in StreamableHTTP transport (modelcontextprotocol#1271)

Co-authored-by: David Soria Parra <167242713+dsp-ant@users.noreply.github.com>

* chore: uncomment .idea/ in .gitignore (modelcontextprotocol#1287)

Co-authored-by: Claude <noreply@anthropic.com>

* docs: clarify streamable_http_path configuration when mounting servers (modelcontextprotocol#1172)

* feat: Add CORS configuration for browser-based MCP clients (modelcontextprotocol#1059)

Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Added Audio to FastMCP (modelcontextprotocol#1130)

* fix: avoid uncessary retries in OAuth authenticated requests (modelcontextprotocol#1206)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Add PATHEXT to default STDIO env vars in windows (modelcontextprotocol#1256)

* fix: error too many values to unpack (expected 2) (modelcontextprotocol#1279)

Signed-off-by: San Nguyen <vinhsannguyen91@gmail.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* SDK Parity: Avoid Parsing Server Response for non-JsonRPCMessage Requests (modelcontextprotocol#1290)

* types: Setting default value for method: Literal (modelcontextprotocol#1292)

* changes structured temperature to not deadly (modelcontextprotocol#1328)

* Update simple-resource example to use non-deprecated read_resource return type (modelcontextprotocol#1331)

Co-authored-by: Claude <noreply@anthropic.com>

* docs: Update README to include link to API docs for modelcontextprotocol#1329 (modelcontextprotocol#1330)

* Allow ping requests before initialization (modelcontextprotocol#1312)

* Python lint: Ruff rules for pylint and code complexity (modelcontextprotocol#525)

* Fix context injection for resources and prompts (modelcontextprotocol#1336)

* fix(fastmcp): propagate mimeType in resource template list (modelcontextprotocol#1186)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* fix: allow elicitations accepted without content (modelcontextprotocol#1285)

Co-authored-by: Olivier Schiavo <olivier.schiavo@wengo.com>

* Use --frozen in pre-commit config (modelcontextprotocol#1375)

* Return HTTP 403 for invalid Origin headers (modelcontextprotocol#1353)

* Add test for ProtectedResourceMetadataParsing (modelcontextprotocol#1236)

Co-authored-by: Paul Carleton <paulcarletonjr@gmail.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Fastmcp logging progress example (modelcontextprotocol#1270)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* feat: add paginated list decorators for prompts, resources, and tools (modelcontextprotocol#1286)

Co-authored-by: Claude <noreply@anthropic.com>

* Remove "unconditionally" from conditional description (modelcontextprotocol#1289)

* Use streamable-http consistently in examples (modelcontextprotocol#1389)

* feat: Add SDK support for SEP-1034 default values in elicitation schemas (modelcontextprotocol#1337)

Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Implementation of SEP 973 - Additional metadata + icons support (modelcontextprotocol#1357)

* Add error log for client stdio (modelcontextprotocol#924)

Co-authored-by: Your Name <youremail@yourdomain.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Accept additional response_types values from OAuth servers (modelcontextprotocol#1323)

* Issue 1379 patch - Fix MCP server OAuth not working with Visual Studio Code and others with extra grant_types (modelcontextprotocol#1380)

* Add comprehensive Unicode tests for streamable HTTP transport (modelcontextprotocol#1381)

* Update Icon.sizes to use string array format (modelcontextprotocol#1411)

* Delete CODEOWNERS to eliminate notification overload (modelcontextprotocol#1413)

* fix: fix the system message in simple-chatbot example (modelcontextprotocol#1394)

* fix: improve misleading warning for progress callback exceptions (modelcontextprotocol#775)

* fix: catch and rethrow SSEError during SSE connection establishment (modelcontextprotocol#975)

Co-authored-by: zhangchuanhui <zhangchal@digitalchina.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Add icons support for ResourceTemplate (modelcontextprotocol#1412)

* Add documentation structure (modelcontextprotocol#1425)

* Add documentation about testing (modelcontextprotocol#1426)

* Improve OAuth protected resource metadata URL construction per RFC 9728 (modelcontextprotocol#1407)

* feat: add ability to remove tools (modelcontextprotocol#1322)

Co-authored-by: David Soria Parra <167242713+dsp-ant@users.noreply.github.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

* Update README to link to Python SDK documentation (modelcontextprotocol#1430)

* fix: update CLAUDE.md to remove auto-addition of reviewers. (modelcontextprotocol#1431)

* [client] Implement MCP OAuth scope selection and step-up authorization (modelcontextprotocol#1324)

* Handles message type Exception in lowlevel/server.py _handle_message function. Mentioned as TODO on line 528. (modelcontextprotocol#786)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Fix workspace configuration error with structured_output_lowlevel.py  (modelcontextprotocol#1471)

Co-authored-by: lorenss-m <saeclmusic@gmail.com>

* fix: Remove unnecessary constructor from ResourceServerSettings (modelcontextprotocol#1424)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* feat: add resource annotations support to FastMCP (modelcontextprotocol#1468)

* fix: send params as empty object for list methods without cursor (modelcontextprotocol#1453)

* fix: Set the Server session initialization state immediately after respond… (modelcontextprotocol#1478)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* feat: add tool metadata in FastMCP.tool decorator (modelcontextprotocol#1463)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* Make client examples workspaces to reflect package code (modelcontextprotocol#1466)

* Expose RequestParams._meta in ClientSession.call_tool (modelcontextprotocol#1231)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Allow CallToolResult to be returned directly to support _meta field for OpenAI Apps (modelcontextprotocol#1459)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* fix: uv CVE-2025-62518 astral-tokio-tar issue GHSA-j5gw-2vrg-8fgx (modelcontextprotocol#1505)

* fix: use proper dependency resolution in CI (modelcontextprotocol#1507)

* Upgrade GitHub Actions (modelcontextprotocol#1473)

* test: use errno.ENOENT for command not found assertion (modelcontextprotocol#1498)

* Replace deprecated dev-dependencies with dependency-groups (modelcontextprotocol#1488)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* update uv to 0.9.5 (modelcontextprotocol#1510)

* Relax Accept header requirement for JSON-only responses (modelcontextprotocol#1500)

* fix: replace deprecated dev-dependencies in examples/clients (modelcontextprotocol#1518)

* fix: Update spec links to new modelcontextprotocol.io location (modelcontextprotocol#1491)

* fix: Replace fixed sleep with active server readiness check in SSE tests (modelcontextprotocol#1526)

* fix: Replace arbitrary sleeps with active server readiness checks in tests (modelcontextprotocol#1527)

Co-authored-by: Claude <noreply@anthropic.com>

* Fix flaky timeout test in test_88_random_error (modelcontextprotocol#1525)

* fix: Replace remaining manual server polling with wait_for_server helper (modelcontextprotocol#1529)

* Implement RFC 7523 JWT flows (modelcontextprotocol#1247)

Co-authored-by: Yann Jouanin <yann.jouanin@valueandco.com>

* Fix pyright error and replace wildcard import with explicit imports (modelcontextprotocol#1532)

* Fix auth client example URL handling for oauth provider (modelcontextprotocol#1549)

* docs: use article "an" before "MCP" instead of "a" (modelcontextprotocol#1558)

* Update Starlette to 0.49.1 in uv.lock (modelcontextprotocol#1559)

* Fix typo in `ClientSessionGroup` doc string (modelcontextprotocol#1572)

* Implement SEP-985: OAuth Protected Resource Metadata discovery fallback (modelcontextprotocol#1548)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Paul Carleton <paulc@anthropic.com>

* Add --frozen flag to uv run commands in Claude config (modelcontextprotocol#1583)

* Add get_server_capabilities() to ClientSession (modelcontextprotocol#1588)

* Add everything-server for comprehensive MCP conformance testing (modelcontextprotocol#1587)

* Get baseline 100% clean coverage (modelcontextprotocol#1553)

* Add end-of-file-fixer pre-commit hook (modelcontextprotocol#1610)

* Add coverage baseline commit to git-blame-ignore (modelcontextprotocol#1613)

* Add SEP-1034 conformance test support to everything-server (modelcontextprotocol#1604)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* refactor: extract OAuth helper functions and simplify provider state (modelcontextprotocol#1586)

* Add client_id_metadata_document_supported to OAuthMetadata (modelcontextprotocol#1603)

* Fix OAuth discovery fallback and URL ordering (modelcontextprotocol#1624)

* Refactor `func_metadata()` implementation (modelcontextprotocol#1496)

* Fix CI highest resolution test to actually test highest versions (modelcontextprotocol#1609)

* feat: Pass through and expose additional parameters in `ClientSessionGroup.call_tool` and `.connect_to_server` (modelcontextprotocol#1576)

* fix get_client_metadata_scopes on 401 (modelcontextprotocol#1631)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* chore: Lazy import `jsonschema` library (modelcontextprotocol#1596)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>

* docs: Update examples to use stateless HTTP with JSON responses (modelcontextprotocol#1499)

* Add tests for JSON Schema 2020-12 field preservation (SEP-1613) (modelcontextprotocol#1649)

* Add client_secret_basic authentication support (modelcontextprotocol#1334)

Co-authored-by: Paul Carleton <paulc@anthropic.com>

* Implement SEP-1577 - Sampling With Tools (modelcontextprotocol#1594)

Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Claude <noreply@anthropic.com>

* SEP-1330: Elicitation Enum Schema Improvements and Standards Compliance (modelcontextprotocol#1246)

Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* [auth][conformance] add conformance auth client (modelcontextprotocol#1640)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Implement SEP-986: Tool name validation (modelcontextprotocol#1655)

* fix: url for spec (modelcontextprotocol#1659)

* feat: implement SEP-991 URL-based client ID (CIMD) support (modelcontextprotocol#1652)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* Update doc string on custom_route (modelcontextprotocol#1660)

* Implement SEP-1036: URL mode elicitation for secure out-of-band interactions (modelcontextprotocol#1580)

Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>

* Skip empty SSE data to avoid parsing errors (modelcontextprotocol#1670)

* SEP-1686: Tasks (modelcontextprotocol#1645)

* Add on_session_created callback option (modelcontextprotocol#1710)

* Add SSE polling support (SEP-1699) (modelcontextprotocol#1654)

* Support client_credentials flow with JWT and Basic auth (modelcontextprotocol#1663)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>

* feat: backwards-compatible create_message overloads for SEP-1577 (modelcontextprotocol#1713)

* Merge commit from fork

* Auto-enable DNS rebinding protection for localhost servers

When a FastMCP server is created with host="127.0.0.1" or "localhost"
and no explicit transport_security is provided, automatically enable
DNS rebinding protection. Both 127.0.0.1 and localhost are allowed
as valid hosts/origins since clients may use either to connect.

* Add tests for auto DNS rebinding protection on localhost

Tests verify that:
- Protection auto-enables for host=127.0.0.1
- Protection auto-enables for host=localhost
- Both 127.0.0.1 and localhost are in allowed hosts/origins
- Protection does NOT auto-enable for other hosts (e.g., 0.0.0.0)
- Explicit transport_security settings are not overridden

* Add IPv6 localhost (::1) support for DNS rebinding protection

Extend auto-enable DNS rebinding protection to also cover IPv6
localhost. When host="::1", protection is now auto-enabled with
appropriate allowed hosts ([::1]:*) and origins (http://[::1]:*).

* Fix import ordering in test file

* chore: update LATEST_PROTOCOL_VERSION to 2025-11-25 (modelcontextprotocol#1715)

* fix: add lifespan context manager to StreamableHTTP mounting examples (modelcontextprotocol#1669)

Co-authored-by: TheMailmans <tyler@example.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

* fix: handle ClosedResourceError in StreamableHTTP message router (modelcontextprotocol#1384)

Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

* fix: skip priming events and close_sse_stream for old protocol versions (modelcontextprotocol#1719)

* refactor(auth): remove unused _register_client method (modelcontextprotocol#1748)

* [MCP-266] Add tests for Gumloop server extensions

* Fix uv workspace config for gumloop-mcp package name

* Sync with upstream MCP SDK and fix merge conflicts

* Fix tool cache timing and missing properties check in server.py

* Fix coverage and add proper type annotations for Gumloop extensions

* Version up

* Skip README code example tests (Gumloop README has no code snippets)

* Support gumloop and mcp outptuschema

* Add publish tools to dev dependencies and update README for uv

---------

Signed-off-by: San Nguyen <vinhsannguyen91@gmail.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
Co-authored-by: yurikunash <143175350+yurikunash@users.noreply.github.com>
Co-authored-by: Pamela Fox <pamela.fox@gmail.com>
Co-authored-by: Inna Harper <inna.hrpr@gmail.com>
Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
Co-authored-by: Ian Davenport <49379192+davenpi@users.noreply.github.com>
Co-authored-by: Dagang Wei <functicons@gmail.com>
Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Stanley Law <stanleylkal@gmail.com>
Co-authored-by: Luca Chang <131398524+LucaButBoring@users.noreply.github.com>
Co-authored-by: leweng <leweng@nvidia.com>
Co-authored-by: Clare Liguori <liguori@amazon.com>
Co-authored-by: lukacf <luka@peltarion.com>
Co-authored-by: ihrpr <inna@anthropic.com>
Co-authored-by: Tapan Chugh <chugh.tapan@gmail.com>
Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>
Co-authored-by: Yann Jouanin <4557670+yannj-fr@users.noreply.github.com>
Co-authored-by: Paul Carleton <paulcarletonjr@gmail.com>
Co-authored-by: Sreenath Somarajapuram <somarajapuram@gmail.com>
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enhancement Request for a new feature that's not currently supported needs more work Not ready to be merged yet, needs additional follow-up from the author(s).

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