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pcarleton merged 9 commits into from
Nov 24, 2025
Merged

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

pcarleton merged 9 commits into from
Nov 24, 2025
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@pcarleton pcarleton commented Nov 23, 2025

Summary

Implements support for Client ID Metadata Documents (CIMD) as defined in SEP-991. When a server advertises client_id_metadata_document_supported=true in its OAuth metadata and the client provides a valid client_metadata_url, the URL is used as the client_id instead of performing dynamic client registration (DCR).

This allows clients to use HTTPS URLs as client identifiers where the URL points to a JSON document containing client metadata, enabling servers to implement flexible trust policies for URL-based client registration without requiring pre-coordination.

Changes

  • Add client_metadata_url parameter to OAuthClientProvider
  • Add helper functions in utils.py:
    • is_valid_client_metadata_url() - validates CIMD URLs (must be HTTPS with non-root pathname)
    • should_use_client_metadata_url() - determines if CIMD should be used based on server support
    • create_client_info_from_metadata_url() - creates client info with URL as client_id
  • Update auth flow to use CIMD when server supports it, falling back to DCR otherwise
  • Validate client_metadata_url at initialization time
  • Update simple-auth-client example to demonstrate CIMD usage

Test plan

  • Tested against MCP conformance test suite (auth/basic-cimd scenario)
  • Verified client uses URL-based client_id when server advertises CIMD support
  • Verified client skips DCR registration endpoint when using CIMD
  • Verified auth flow completes successfully with CIMD
  • Unit tests for new helper functions

Closes #1538

@pcarleton
feat: implement SEP-991 URL-based client ID (CIMD) support
7d68025 
Add support for Client ID Metadata Documents (CIMD) as defined in SEP-991.
When a server advertises client_id_metadata_document_supported=true and the
client provides a valid client_metadata_url, the URL is used as the client_id
instead of performing dynamic client registration.

Changes:
- Add client_metadata_url parameter to OAuthClientProvider
- Add helper functions in utils.py: is_valid_client_metadata_url,
  should_use_client_metadata_url, create_client_info_from_metadata_url
- Update auth flow to use CIMD when conditions are met
- Validate client_metadata_url at initialization time (must be HTTPS with
  non-root pathname)

Github-Issue:#1538
@pcarleton
docs: add CIMD usage example to simple-auth-client
66c783e 
Update simple-auth-client to demonstrate using client_metadata_url
parameter for SEP-991 CIMD support.
@pcarleton
test: add unit tests for SEP-991 CIMD support
f32cdad 
Add comprehensive unit tests for the Client ID Metadata Document (CIMD)
functionality including:
- URL validation tests for is_valid_client_metadata_url
- Tests for should_use_client_metadata_url logic
- Tests for create_client_info_from_metadata_url
- OAuthClientProvider initialization tests with client_metadata_url
- Auth flow tests verifying CIMD is used when server supports it
- Auth flow tests verifying fallback to DCR when CIMD not supported
@pcarleton pcarleton force-pushed the pcarleton/sep-991-cimd branch from c56ff46 to f32cdad Compare November 23, 2025 18:03
@pcarleton @claude
Add tests for create_client_registration_request and mark defensive code
e936893 
Add tests to cover the fallback path in create_client_registration_request
when auth_server_metadata is None or lacks a registration_endpoint.

Mark the exception handler in is_valid_client_metadata_url as pragma: no cover
since urlparse rarely throws exceptions and this is purely defensive code.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
pcarleton
pcarleton commented Nov 23, 2025
View reviewed changes
src/mcp/client/auth/utils.py
raise OAuthRegistrationError(f"Invalid registration response: {e}")


def is_valid_client_metadata_url(url: str | None) -> bool:
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@pcarleton pcarleton Nov 23, 2025

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open to a different break down of helper functions here, this seemed like a reasonably flexible combo.

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@felixweinberger felixweinberger Nov 24, 2025

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seems appropriate to me

@pcarleton @claude
Allow configuring client_metadata_url via environment variable
299fe27 
Add MCP_CLIENT_METADATA_URL environment variable support to the
simple-auth-client example, allowing users to specify their own
client metadata URL for CIMD (SEP-991) instead of using a hardcoded value.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@pcarleton pcarleton marked this pull request as ready for review November 24, 2025 11:27
@pcarleton pcarleton requested a review from maxisbey November 24, 2025 11:27
felixweinberger
felixweinberger previously approved these changes Nov 24, 2025
View reviewed changes
src/mcp/client/auth/oauth2.py Outdated
redirect_handler: Callable[[str], Awaitable[None]] | None
callback_handler: Callable[[], Awaitable[tuple[str, str | None]]] | None
timeout: float = 300.0
client_metadata_url: str | None = None # SEP-991: URL-based client ID
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nit: personally think we shouldn't litter comments with references to SEP numbers, hard to keep up-to-date.

src/mcp/client/auth/utils.py
raise OAuthRegistrationError(f"Invalid registration response: {e}")


def is_valid_client_metadata_url(url: str | None) -> bool:
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seems appropriate to me

@pcarleton
Remove SEP-991 references from comments
a2630ac 
Remove temporary SEP number references from code comments since these
are difficult to maintain and can become outdated. The CIMD (Client ID
Metadata Document) terminology is kept as it's a meaningful acronym.
maxisbey
maxisbey reviewed Nov 24, 2025
View reviewed changes
src/mcp/client/auth/utils.py Outdated
try:
parsed = urlparse(url)
return parsed.scheme == "https" and parsed.path not in ("", "/")
except Exception: # pragma: no cover
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@maxisbey maxisbey Nov 24, 2025

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why no cover?

@pcarleton pcarleton requested a review from maxisbey November 24, 2025 16:51
@pcarleton
Add test for urlparse exception in is_valid_client_metadata_url
efd73df 
Add test case with malformed IPv6 URL to cover the exception branch,
removing the pragma: no cover comment.
@pcarleton pcarleton force-pushed the pcarleton/sep-991-cimd branch from a96218d to efd73df Compare November 24, 2025 17:06
@pcarleton pcarleton merged commit f225013 into main Nov 24, 2025
21 checks passed
@pcarleton pcarleton deleted the pcarleton/sep-991-cimd branch November 24, 2025 17:21
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>
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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>
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Implement SEP-991: URL-based Client Registration (OAuth Client ID Metadata)

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