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Implements basic OIDC support for working with authorization servers that don't expose OAuth metadata, following the semantics described in RFC 8414 Section 5.

As part of this change, I modified the internal fallback behavior from a simple boolean flag to instead represent discovery as a stack of methods, which are consumed sequentially until one fallback method succeeds. This also helps clean up the duplicated code from working with AsyncGenerator.

Motivation and Context

Enables falling back to OIDC 1.0 metadata when a server does not support OAuth metadata according to RFC 8414.

How Has This Been Tested?

Added/updated unit tests.

Breaking Changes

None

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

#976

@ihrpr
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ihrpr commented Jul 7, 2025

Thank you! Sorry, we had back and forth with this spec changes. For now it's on hold until modelcontextprotocol/modelcontextprotocol#797 is merged

@ihrpr ihrpr added this to the auth milestone Jul 7, 2025
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@dsp-ant dsp-ant left a comment

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I'll add a claude generated review in addition, since I reviewed it and found it quite useful.

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dsp-ant commented Jul 15, 2025

Here is Claude's take, which in this instance, I found helpful:

Thank you for implementing RFC 9728 support with OIDC fallback functionality. While the implementation works, I have concerns about the complexity of the approach, particularly around the callback-based discovery stack pattern.

Main Concerns

1. Over-engineered Discovery Stack Pattern

The current implementation uses a callback-based stack with function references:

OAuthDiscoveryStack = list[Callable[[], Awaitable[httpx.Request]]]

This pattern, combined with stack reversal and while-loop popping, adds unnecessary complexity:

  • The callbacks don't encapsulate varying behavior - they just generate URLs
  • The stack reversal (discovery_attempts.reverse()) followed by pop() is non-idiomatic
  • while len(oauth_discovery_stack) > 0: should be while oauth_discovery_stack:

2. Scattered URL Building Logic

The implementation has four separate methods for URL construction:

  • _build_well_known_path()
  • _build_well_known_fallback_url()
  • _build_oidc_fallback_path()
  • _build_oidc_fallback_url()

This fragmentation makes it harder to understand the discovery order and URL patterns.

3. Unnecessary State Management

The code stores intermediate state as instance variables:

self.context.discovery_base_url = base_url
self.context.discovery_pathname = parsed.path

These are only used for fallback logic and could be handled more cleanly.

Suggested Simplification

Replace the callback stack with a straightforward URL list approach:

def _get_discovery_urls(self) -> list[tuple[str, str]]:
    """Generate ordered list of (url, type) tuples for discovery attempts."""
    urls = []
    auth_server_url = self.context.auth_server_url or self.context.server_url
    parsed = urlparse(auth_server_url)
    base_url = f"{parsed.scheme}://{parsed.netloc}"
    
    # RFC 8414: Path-aware OAuth discovery
    if parsed.path and parsed.path != "/":
        oauth_path = f"/.well-known/oauth-authorization-server{parsed.path.rstrip('/')}"
        urls.append((urljoin(base_url, oauth_path), "oauth"))
    
    # OAuth root fallback
    urls.append((urljoin(base_url, "/.well-known/oauth-authorization-server"), "oauth"))
    
    # RFC 8414 section 5: Path-aware OIDC discovery  
    if parsed.path and parsed.path != "/":
        oidc_path = f"/.well-known/openid-configuration{parsed.path.rstrip('/')}"
        urls.append((urljoin(base_url, oidc_path), "oidc"))
    
    # OIDC 1.0 fallback (appends to full URL per spec)
    oidc_fallback = urljoin(auth_server_url.rstrip("/"), "/.well-known/openid-configuration")
    urls.append((oidc_fallback, "oidc"))
    
    return urls

Then in async_auth_flow():

# Step 2: Discover OAuth metadata (with fallback for legacy servers)
discovery_urls = self._get_discovery_urls()
for url, discovery_type in discovery_urls:
    request = httpx.Request("GET", url, headers={MCP_PROTOCOL_VERSION: LATEST_PROTOCOL_VERSION})
    response = yield request
    
    if response.status_code == 200:
        try:
            content = await response.aread()
            metadata = OAuthMetadata.model_validate_json(content)
            self.context.oauth_metadata = metadata
            # Apply default scope if needed
            if self.context.client_metadata.scope is None and metadata.scopes_supported is not None:
                self.context.client_metadata.scope = " ".join(metadata.scopes_supported)
            break
        except ValidationError:
            continue
    elif response.status_code != 404:
        break  # Non-404 error, stop trying

Benefits of This Approach

  1. Explicit discovery order: All URLs are visible in one place
  2. No callbacks: Direct, simple URL generation
  3. Pythonic iteration: Standard for-loop instead of while/pop
  4. Less state: No instance variables for intermediate values
  5. Easier testing: URL generation can be unit tested separately
  6. Clearer intent: The fallback chain is immediately apparent

Minor Issues

  • Line 295: Use return response_status == 404 and discovery_stack instead of len(discovery_stack) > 0
  • The comment on line 577-578 about declaring the stack backwards is a code smell

Overall

The implementation is functionally correct and follows the RFCs properly. My suggestions are about reducing complexity and making the code more Pythonic. The callback pattern might make sense in other contexts, but here it adds unnecessary abstraction for what is essentially "try these URLs in order until one works."

Would you consider simplifying the approach? Happy to discuss further or help with the refactoring.

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dsp-ant commented Jul 15, 2025

@ihrpr how do you want to sequence this? My suggestion is waiting for this PR to be in an acceptable state, then merge the spec change and the python sdk pr at the same time.

@LucaButBoring
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Will make the changes by EOD tomorrow (juggling other things as well) - I agree with what you called out in general.


For context, the reason I did it like this originally was because the entire OAuth flow was duplicated in the async_auth_flow function due to generator syntax limitations, so I was attempting to avoid explicitly writing the entire fallback sequence twice. #1071 was merged earlier today which was able to remove the duplicated OAuth flow, so the discovery stack thing doesn't make sense anymore.

@ihrpr ihrpr linked an issue Jul 16, 2025 that may be closed by this pull request
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ihrpr commented Jul 16, 2025

@ihrpr how do you want to sequence this? My suggestion is waiting for this PR to be in an acceptable state, then merge the spec change and the python sdk pr at the same time.

yes, that works, adding tracking for this as well

@LucaButBoring LucaButBoring requested a review from dsp-ant July 16, 2025 19:09
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LGTM

@dsp-ant dsp-ant merged commit 99c4f3c into modelcontextprotocol:main Jul 17, 2025
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@LucaButBoring LucaButBoring deleted the feat/oidc-fallback branch August 1, 2025 16:12
saqadri pushed a commit to saqadri/stdio-fixes that referenced this pull request Aug 6, 2025
rbehal pushed a commit to gumloop/gumloop-mcp that referenced this pull request Sep 25, 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)

* Merge upstream/main with custom filtering

---------

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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)

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>
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>
Co-authored-by: Omer Korner <omerkorner@gmail.com>
Co-authored-by: joesavage-silabs <159480754+joesavage-silabs@users.noreply.github.com>
Co-authored-by: Gregory L <gregory.linford@mistral.ai>
Co-authored-by: David Soria Parra <167242713+dsp-ant@users.noreply.github.com>
Co-authored-by: Moustapha Ebnou <155577789+mous222@users.noreply.github.com>
Co-authored-by: Max Isbey <224885523+maxisbey@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Jerome <jerome@anthropic.com>
Co-authored-by: xavier <84836280+dragonier23@users.noreply.github.com>
Co-authored-by: keurcien <keurcien.luu@gmail.com>
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Co-authored-by: jess <jessachandler@gmail.com>
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Co-authored-by: Christian Clauss <cclauss@me.com>
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Co-authored-by: owengo <owengo@users.noreply.github.com>
Co-authored-by: Olivier Schiavo <olivier.schiavo@wengo.com>
Co-authored-by: Steve Billings <billings.steve@gmail.com>
Co-authored-by: Mike Salvatore <mike.s.salvatore@gmail.com>
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Co-authored-by: automaton82 <terrence.sheflin@gmail.com>
Co-authored-by: Yukuan Jia <jiayukuan@huawei.com>
Co-authored-by: Lorenzo <lorenzo_cesconeto@hotmail.com>
Co-authored-by: ZhangChuanhui <57099533+zhangch-ss@users.noreply.github.com>
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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>
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>
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enhance auth server discovery with OAuth2 and OIDC metadata support

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