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@brandonspark brandonspark commented Aug 29, 2025

Motivation and Context

I am interested in being able to dynamically have a server offer only certain tools based on information received during its initialization. I could conditionally declare the tool, for instance:

if cond:
  @mcp.tool
  async def foo():
    ...

but I perceive this to be relatively gross. I would prefer to be able to remove a tool within the API.

How Has This Been Tested?

I can achieve comparable behavior by inserting an if before defining a function with the mcp.tool() decorator.

Breaking Changes

No.

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

@brandonspark brandonspark requested review from a team and Kludex August 29, 2025 18:32
dsp-ant
dsp-ant previously approved these changes Sep 1, 2025
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I think this is very reasonable. @Kludex opinions?

@Kludex
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Kludex commented Sep 1, 2025

I think this is very reasonable. @Kludex opinions?

It seems something is missing, since the user doesn't have access to the underlying ToolManager from the FastMCP object.

How is the user supposed to remove a tool?

@brandonspark
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I think this is very reasonable. @Kludex opinions?

It seems something is missing, since the user doesn't have access to the underlying ToolManager from the FastMCP object.

How is the user supposed to remove a tool?

I was under the impression that one could obtain it from doing mcp._tool_manager from a ToolManager object. I assume your objection is because that field is supposed to be "private", but it would enable my use case. Do you have a significant objection?

It feels natural to me that this code should exist, as add_tool also exists.

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Kludex commented Sep 2, 2025

That's a significant objection.

@brandonspark
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That's a significant objection.

Then, as a maintainer, do you have thoughts on how you would rather enable this behavior? I am not as familiar with your project.

It seems reasonably clear to me that a user may want to alter the tools which are available to the MCP, in a way that is not solely static. I don't see why the tool manager must be private, nor why we could not surface some of these methods through the API.

@Kludex
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Kludex commented Sep 2, 2025

I think the current implementation (besides my comment about the exceptions) makes sense. It's just incomplete.

Is the idea here to disable the tool for the whole app lifecycle or for the session? Does it even makes sense to have it disable for the app lifecycle, since the app may be running in multiple machines? I guess we want to expose a method you can call from the Context object anyway.

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Kludex commented Sep 2, 2025

I don't think ToolManager should be exposed.

@brandonspark
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brandonspark commented Sep 2, 2025

I think the current implementation (besides my comment about the exceptions) makes sense. It's just incomplete.

Is the idea here to disable the tool for the whole app lifecycle or for the session? Does it even makes sense to have it disable for the app lifecycle, since the app may be running in multiple machines? I guess we want to expose a method you can call from the Context object anyway.

In my use case, it would actually be most ideal if a tool could be enabled or disabled for specific sessions (meaning, differing tools for differing consumers of a single server). I wanted to downscope this, as this is certainly more complicated than I feel I am seeking to implement right now. My understanding is that currently ToolManager is "global" for the entire app.

In my use case, I want users who are hosting their own servers (instances of the application) to be able to decide if they want to allow certain tools to be available to the consumers of their server. The best way to do this currently is with conditional declaration, which I view to be quite heavy handed.

If we do not expose ToolManager, we could expose a method which makes use of remove_tool, but I don't see a place in the current API (a particular class, specifically) where that makes sense.

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Oh, I now see that FastMCP exposes a thin wrapper around add_tool. Any objections to me doing the same for remove_tool?

class FastMCP(Generic[LifespanResultT]):

@felixweinberger felixweinberger changed the title chore: add ability to remove tools feat: add ability to remove tools Sep 24, 2025
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Chiming in here, I think this is indeed the missing piece:

Oh, I now see that FastMCP exposes a thin wrapper around add_tool. Any objections to me doing the same for remove_tool?

class FastMCP(Generic[LifespanResultT]):

Instead of exposing ToolManager (which I agree we shouldn't), having an utility on FastMCP to remove_tools makes sense to me without adding huge complexity.

Would you have bandwidth to implement that @brandonspark?

@felixweinberger felixweinberger added needs more work Not ready to be merged yet, needs additional follow-up from the author(s). enhancement labels Sep 24, 2025
@felixweinberger felixweinberger self-assigned this Sep 30, 2025
@felixweinberger felixweinberger added the needs maintainer action Potentially serious issue - needs proactive fix and maintainer attention label Sep 30, 2025
@felixweinberger felixweinberger linked an issue Oct 3, 2025 that may be closed by this pull request
Add a remove_tool method to the FastMCP class that allows tools to be
dynamically removed from a server at runtime. This enables use cases
where tools should only be available based on initialization state or
user actions.

The implementation includes:
- remove_tool() method on FastMCP class that wraps the existing
  ToolManager.remove_tool() functionality
- Comprehensive test coverage for tool removal scenarios
- Proper error handling when attempting to remove non-existent tools

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

Co-Authored-By: Claude <noreply@anthropic.com>
Github-Issue: modelcontextprotocol#1322
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maxisbey commented Oct 6, 2025

Hey @brandonspark I've pushed up the changes that @felixweinberger requested to help move the PR across the line since the changes were quite simple.

@felixweinberger felixweinberger dismissed their stale review October 6, 2025 13:14

Dismissing my own review to check out the updates

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LGTM, thanks for updating @maxisbey

@felixweinberger felixweinberger merged commit b8e758b into modelcontextprotocol:main Oct 6, 2025
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Any thoughts on when this will make it into a release?

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Any thoughts on when this will make it into a release?

Should be in the next release on Thursday.

@felixweinberger felixweinberger added enhancement Request for a new feature that's not currently supported and removed enhancement deprecated labels Nov 12, 2025
rbehal pushed a commit to gumloop/gumloop-mcp that referenced this pull request Dec 9, 2025
* 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)

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

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* 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>
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* Fastmcp logging progress example (modelcontextprotocol#1270)

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* 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)

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

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

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* 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)

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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)

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* 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)

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

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

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* 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)

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

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* 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)

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* 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)

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

* Implement RFC 7523 JWT flows (modelcontextprotocol#1247)

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* 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)

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* 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)

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* 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)

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* 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)

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* 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)

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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)

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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)

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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)

---------

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rbehal added a commit to gumloop/gumloop-mcp that referenced this pull request Dec 10, 2025
* 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>
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Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>
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Co-authored-by: Tapan Chugh <chugh.tapan@gmail.com>
Co-authored-by: Tapan Chugh <tapanc@cs.washington.edu>
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Co-authored-by: zhangchuanhui <zhangchal@digitalchina.com>
Co-authored-by: Marcus Shu <46469249+shulkx@users.noreply.github.com>
Co-authored-by: Brandon Wu <49291449+brandonspark@users.noreply.github.com>
Co-authored-by: Dogacan Colak <dogacancolak@gmail.com>
Co-authored-by: AishwaryaKalloli <30429206+AishwaryaKalloli@users.noreply.github.com>
Co-authored-by: lorenss-m <saeclmusic@gmail.com>
Co-authored-by: Rocky Haotian Du <2712479005@qq.com>
Co-authored-by: Fenn Bailey <fennb@users.noreply.github.com>
Co-authored-by: daamitt <147169947+daamitt@users.noreply.github.com>
Co-authored-by: Mat Leonard <137834585+mat-octave@users.noreply.github.com>
Co-authored-by: Samuel Felipe Chenatti <samuel.chenatti@gmail.com>
Co-authored-by: Brandon Shar <6599653+BrandonShar@users.noreply.github.com>
Co-authored-by: mingo007 <maoqiming1@huawei.com>
Co-authored-by: adam jones <domdomegg+git@gmail.com>
Co-authored-by: Yann Jouanin <yann.jouanin@valueandco.com>
Co-authored-by: Koichi ITO <koic.ito@gmail.com>
Co-authored-by: Cole Murray <colemurray.cs@gmail.com>
Co-authored-by: inaku <63503085+inaku-Gyan@users.noreply.github.com>
Co-authored-by: Chris Coutinho <12901868+cbcoutinho@users.noreply.github.com>
Co-authored-by: Paul Carleton <paulc@anthropic.com>
Co-authored-by: Camila Rondinini <camila@anthropic.com>
Co-authored-by: Victorien <65306057+Viicos@users.noreply.github.com>
Co-authored-by: Andrii Blyzniuk <bliznyuk.andrey@gmail.com>
Co-authored-by: Liang Wu <18244712+wuliang229@users.noreply.github.com>
Co-authored-by: adam jones <adamj+git@anthropic.com>
Co-authored-by: Olivier Chafik <ochafik@anthropic.com>
Co-authored-by: Tyler Mailman <themailmaninbox@gmail.com>
Co-authored-by: TheMailmans <tyler@example.com>
Co-authored-by: Edison <Edison.A.N@hotmail.com>
Co-authored-by: dvlpjrs <dvlp.jrs@gmail.com>
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enhancement Request for a new feature that's not currently supported needs maintainer action Potentially serious issue - needs proactive fix and maintainer attention needs more work Not ready to be merged yet, needs additional follow-up from the author(s).

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removing a tool or resource dynamically

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