Fix OAuth discovery fallback and URL ordering #1624

maxisbey · 2025-11-13T17:52:13Z

Motivation and Context

This PR addresses two related OAuth discovery issues that affect backward compatibility and correctness:

Issue #1495: Legacy Server Compatibility

Version 1.18.0 broke compatibility with legacy MCP servers (like Linear and Atlassian) that don't yet support Protected Resource Metadata (PRM) endpoints. The implementation raised an exception when PRM discovery failed, preventing fallback to the March 2025 spec behavior.

Issue #1623: Incorrect OAuth Discovery URL Priority

The OAuth discovery URL ordering was incorrect, causing the system to try root-level URLs before path-based OIDC URLs. This broke authentication with services like Jira MCP where tenant-specific authorization servers should take precedence over root-level servers.

Changes

1. Enable Fallback to March 2025 Spec (Issue #1495)

Removed exception when PRM discovery fails completely
Added fallback logic to use root-based OAuth discovery for backward compatibility
When PRM unavailable, only check /.well-known/oauth-authorization-server at the root
Maintains compatibility with legacy servers like Linear (https://mcp.linear.app/sse) and Atlassian (https://mcp.atlassian.com/v1/sse)

2. Fix OAuth Discovery URL Ordering (Issue #1623)

Path-based discovery only when needed: Only check path-based URLs when the authorization server URL (from PRM) contains a path
Prevents incorrect root discovery: Avoids mistakenly discovering root AS when tenant-specific AS exists (e.g., Okta multi-tenant setups)
Follows RFC 8414 priority: Path-aware OAuth → Path-aware OIDC → OIDC appended format → Root (only when no path)
Fixes TypeScript SDK parity issue: Aligns with the fix made in TypeScript SDK v1.21.1

Implementation Details

Function Renaming:

build_protected_resource_discovery_urls → build_protected_resource_metadata_discovery_urls
get_discovery_urls → build_oauth_authorization_server_metadata_discovery_urls

New Behavior:

build_oauth_authorization_server_metadata_discovery_urls(auth_server_url: str | None, server_url: str)
- Legacy path (auth_server_url is None): Only try {root}/.well-known/oauth-authorization-server
- Path-aware (auth_server_url has path like /tenant1): Only try path-based URLs in priority order
- Root-only (auth_server_url is root like https://auth.example.com): Only try root URLs

Examples

Example 1: Legacy Server (No PRM)

Server: https://mcp.linear.app/sse
1. Try PRM URLs (all fail):
   - /.well-known/oauth-protected-resource/sse
   - /.well-known/oauth-protected-resource
2. Fall back to legacy OAuth discovery:
   - https://mcp.linear.app/.well-known/oauth-authorization-server ✓

Example 2: Path-Aware Discovery

Server: https://api.example.com/v1/mcp
PRM returns: https://auth.example.com/tenant1
1. Try path-aware URLs only:
   - https://auth.example.com/.well-known/oauth-authorization-server/tenant1
   - https://auth.example.com/.well-known/openid-configuration/tenant1
   - https://auth.example.com/tenant1/.well-known/openid-configuration
2. Does NOT try root (prevents wrong AS discovery)

Example 3: Root Authorization Server

Server: https://api.example.com/mcp
PRM returns: https://auth.example.com
1. Try root URLs only:
   - https://auth.example.com/.well-known/oauth-authorization-server
   - https://auth.example.com/.well-known/openid-configuration

Breaking Changes

Some invalid server configurations will no longer work (these violate RFC specifications):

No PRM available AND OASM at a path other than root
PRM returns auth server URL with path, but OASM only exists at root

These configurations are not expected to exist in practice.

Testing

Updated existing tests to use new function signatures
Added test for path-aware discovery behavior
All pre-commit hooks pass (formatting, linting, type checking)

Additional Context

Aligns with SEP-985 (Align OAuth 2.0 Protected Resource Metadata with RFC 9728)
Follows RFC 8414 discovery priorities
Matches TypeScript SDK behavior after their similar fix
Community consensus from issue discussions supports this approach

Related Issues

Fixes #1495
Fixes #1623

This commit addresses two related OAuth discovery issues: 1. Enable fallback to March 2025 spec for legacy servers (issue #1495) - Remove exception when PRM discovery fails completely - Fall back to root-level OAuth discovery for backward compatibility - When PRM unavailable, only check /.well-known/oauth-authorization-server - Maintains compatibility with legacy servers like Linear and Atlassian 2. Fix OAuth discovery URL ordering (issue #1623) - Only check path-based URLs when auth server URL contains a path - Prevents incorrectly discovering root AS when tenant-specific AS exists - Follows RFC 8414 priority: path-aware OAuth, then path-aware OIDC, then root - Fixes issue where root URLs were tried before path-based OIDC URLs Changes: - Renamed build_protected_resource_discovery_urls to build_protected_resource_metadata_discovery_urls - Renamed get_discovery_urls to build_oauth_authorization_server_metadata_discovery_urls - New function signature accepts optional auth_server_url and required server_url - Legacy behavior: when auth_server_url is None, only try root URL - Path-aware behavior: when auth_server_url has path, only try path-based URLs - Root behavior: when auth_server_url has no path, only try root URLs Breaking changes: - Some invalid server configurations will no longer work: - No PRM available and OASM at a path other than root - PRM returns auth server URL with path, but OASM only at root These configurations violate RFC specifications and are not expected to exist. Github-Issue: #1495 Github-Issue: #1623

This commit adds and updates tests to properly cover the new OAuth discovery logic for legacy server compatibility and path-aware discovery. New tests: - test_oauth_discovery_legacy_fallback_when_no_prm: Verifies that when PRM discovery fails, only root OAuth URL is tried (March 2025 spec) - test_oauth_discovery_path_aware_when_auth_server_has_path: Ensures path-based URLs are tried when auth server URL has a path - test_oauth_discovery_root_when_auth_server_has_no_path: Ensures root URLs are tried when auth server URL has no path - test_oauth_discovery_root_when_auth_server_has_only_slash: Handles trailing slash edge case - test_legacy_server_no_prm_falls_back_to_root_oauth_discovery: End-to-end test simulating Linear-style legacy servers - test_legacy_server_with_different_prm_and_root_urls: Tests fallback with custom WWW-Authenticate PRM URLs Updated tests: - test_oauth_discovery_fallback_conditions: Updated to reflect new path-aware discovery behavior (no root URLs when auth server has path) - test_oauth_discovery_fallback_order: Simplified to focus on path-aware case All tests pass with proper linting and type checking. Github-Issue: #1495 Github-Issue: #1623

pcarleton

great, LGTM

)

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Additional metadata + icons support (modelcontextprotocol#1357) * Add error log for client stdio (modelcontextprotocol#924) Co-authored-by: Your Name <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Max Isbey <[email protected]> Co-authored-by: Claude <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * Fix workspace configuration error with structured_output_lowlevel.py (modelcontextprotocol#1471) Co-authored-by: lorenss-m <[email protected]> * fix: Remove unnecessary constructor from ResourceServerSettings (modelcontextprotocol#1424) Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> * feat: add tool metadata in FastMCP.tool decorator (modelcontextprotocol#1463) Co-authored-by: Max Isbey <[email protected]> * Make client examples workspaces to reflect package code (modelcontextprotocol#1466) * Expose RequestParams._meta in ClientSession.call_tool (modelcontextprotocol#1231) Co-authored-by: Felix Weinberger <[email protected]> * Allow CallToolResult to be returned directly to support _meta field for OpenAI Apps (modelcontextprotocol#1459) Co-authored-by: Max Isbey <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> * 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 <[email protected]> * 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 <[email protected]> Co-authored-by: Paul Carleton <[email protected]> * 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 <[email protected]> * 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 <[email protected]> * chore: Lazy import `jsonschema` library (modelcontextprotocol#1596) Co-authored-by: Max Isbey <[email protected]> * 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 <[email protected]> * Implement SEP-1577 - Sampling With Tools (modelcontextprotocol#1594) Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Claude <[email protected]> * SEP-1330: Elicitation Enum Schema Improvements and Standards Compliance (modelcontextprotocol#1246) Co-authored-by: Tapan Chugh <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * [auth][conformance] add conformance auth client (modelcontextprotocol#1640) Co-authored-by: Claude <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> * fix: handle ClosedResourceError in StreamableHTTP message router (modelcontextprotocol#1384) Co-authored-by: Max Isbey <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: yurikunash <[email protected]> Co-authored-by: Pamela Fox <[email protected]> Co-authored-by: Inna Harper <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> Co-authored-by: Ian Davenport <[email protected]> Co-authored-by: Dagang Wei <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Stanley Law <[email protected]> Co-authored-by: Luca Chang <[email protected]> Co-authored-by: leweng <[email protected]> Co-authored-by: Clare Liguori <[email protected]> Co-authored-by: lukacf <[email protected]> Co-authored-by: ihrpr <[email protected]> Co-authored-by: Tapan Chugh <[email protected]> Co-authored-by: Tapan Chugh <[email protected]> Co-authored-by: Yann Jouanin <[email protected]> Co-authored-by: Paul Carleton <[email protected]> Co-authored-by: Sreenath Somarajapuram <[email protected]> Co-authored-by: Omer Korner <[email protected]> Co-authored-by: joesavage-silabs <[email protected]> Co-authored-by: Gregory L <[email protected]> Co-authored-by: David Soria Parra <[email protected]> Co-authored-by: Moustapha Ebnou <[email protected]> Co-authored-by: Max Isbey <[email protected]> Co-authored-by: Claude <[email protected]> Co-authored-by: Jerome <[email protected]> Co-authored-by: xavier <[email protected]> Co-authored-by: keurcien <[email protected]> Co-authored-by: Tim Esler <[email protected]> Co-authored-by: San Nguyen <[email protected]> Co-authored-by: Justin Wang <[email protected]> Co-authored-by: jess <[email protected]> Co-authored-by: Peter Alexander <[email protected]> Co-authored-by: Reid Geyer <[email protected]> Co-authored-by: Eleftheria Stein-Kousathana <[email protected]> Co-authored-by: Christian Clauss <[email protected]> Co-authored-by: pchoudhury22 <[email protected]> Co-authored-by: owengo <[email protected]> Co-authored-by: Olivier Schiavo <[email protected]> Co-authored-by: Steve Billings <[email protected]> Co-authored-by: Mike Salvatore <[email protected]> Co-authored-by: pengwa <[email protected]> Co-authored-by: Your Name <[email protected]> Co-authored-by: Jon Shea <[email protected]> Co-authored-by: automaton82 <[email protected]> Co-authored-by: Yukuan Jia <[email protected]> Co-authored-by: Lorenzo <[email protected]> Co-authored-by: ZhangChuanhui <[email protected]> Co-authored-by: zhangchuanhui <[email protected]> Co-authored-by: Marcus Shu <[email protected]> Co-authored-by: Brandon Wu <[email protected]> Co-authored-by: Dogacan Colak <[email protected]> Co-authored-by: AishwaryaKalloli <[email protected]> Co-authored-by: lorenss-m <[email protected]> Co-authored-by: Rocky Haotian Du <[email protected]> Co-authored-by: Fenn Bailey <[email protected]> Co-authored-by: daamitt <[email protected]> Co-authored-by: Mat Leonard <[email protected]> Co-authored-by: Samuel Felipe Chenatti <[email protected]> Co-authored-by: Brandon Shar <[email protected]> Co-authored-by: mingo007 <[email protected]> Co-authored-by: adam jones <[email protected]> Co-authored-by: Yann Jouanin <[email protected]> Co-authored-by: Koichi ITO <[email protected]> Co-authored-by: Cole Murray <[email protected]> Co-authored-by: inaku <[email protected]> Co-authored-by: Chris Coutinho <[email protected]> Co-authored-by: Paul Carleton <[email protected]> Co-authored-by: Camila Rondinini <[email protected]> Co-authored-by: Victorien <[email protected]> Co-authored-by: Andrii Blyzniuk <[email protected]> Co-authored-by: Liang Wu <[email protected]> Co-authored-by: adam jones <[email protected]> Co-authored-by: Olivier Chafik <[email protected]> Co-authored-by: Tyler Mailman <[email protected]> Co-authored-by: TheMailmans <[email protected]> Co-authored-by: Edison <[email protected]>

* 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 <[email protected]> * docs: add pre-commit install guide on CONTRIBUTING.md (modelcontextprotocol#995) Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> * Unpack settings in FastMCP (modelcontextprotocol#1198) * chore: Remove unused prompt_manager.py file (modelcontextprotocol#1229) Co-authored-by: Tapan Chugh <[email protected]> * Improved supported for ProtectedResourceMetadata (modelcontextprotocol#1235) Co-authored-by: Paul Carleton <[email protected]> * 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 <[email protected]> * fix: prevent async generator cleanup errors in StreamableHTTP transport (modelcontextprotocol#1271) Co-authored-by: David Soria Parra <[email protected]> * chore: uncomment .idea/ in .gitignore (modelcontextprotocol#1287) Co-authored-by: Claude <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * Added Audio to FastMCP (modelcontextprotocol#1130) * fix: avoid uncessary retries in OAuth authenticated requests (modelcontextprotocol#1206) Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> * 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 <[email protected]> * fix: allow elicitations accepted without content (modelcontextprotocol#1285) Co-authored-by: Olivier Schiavo <[email protected]> * 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 <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * Fastmcp logging progress example (modelcontextprotocol#1270) Co-authored-by: Felix Weinberger <[email protected]> * feat: add paginated list decorators for prompts, resources, and tools (modelcontextprotocol#1286) Co-authored-by: Claude <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * Implementation of SEP 973 - Additional metadata + icons support (modelcontextprotocol#1357) * Add error log for client stdio (modelcontextprotocol#924) Co-authored-by: Your Name <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Max Isbey <[email protected]> Co-authored-by: Claude <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * Fix workspace configuration error with structured_output_lowlevel.py (modelcontextprotocol#1471) Co-authored-by: lorenss-m <[email protected]> * fix: Remove unnecessary constructor from ResourceServerSettings (modelcontextprotocol#1424) Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> * feat: add tool metadata in FastMCP.tool decorator (modelcontextprotocol#1463) Co-authored-by: Max Isbey <[email protected]> * Make client examples workspaces to reflect package code (modelcontextprotocol#1466) * Expose RequestParams._meta in ClientSession.call_tool (modelcontextprotocol#1231) Co-authored-by: Felix Weinberger <[email protected]> * Allow CallToolResult to be returned directly to support _meta field for OpenAI Apps (modelcontextprotocol#1459) Co-authored-by: Max Isbey <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> * 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 <[email protected]> * 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 <[email protected]> Co-authored-by: Paul Carleton <[email protected]> * 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 <[email protected]> * 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 <[email protected]> * chore: Lazy import `jsonschema` library (modelcontextprotocol#1596) Co-authored-by: Max Isbey <[email protected]> * 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 <[email protected]> * Implement SEP-1577 - Sampling With Tools (modelcontextprotocol#1594) Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Claude <[email protected]> * SEP-1330: Elicitation Enum Schema Improvements and Standards Compliance (modelcontextprotocol#1246) Co-authored-by: Tapan Chugh <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * [auth][conformance] add conformance auth client (modelcontextprotocol#1640) Co-authored-by: Claude <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> * 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 <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> * fix: handle ClosedResourceError in StreamableHTTP message router (modelcontextprotocol#1384) Co-authored-by: Max Isbey <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> * 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 <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: yurikunash <[email protected]> Co-authored-by: Pamela Fox <[email protected]> Co-authored-by: Inna Harper <[email protected]> Co-authored-by: Marcelo Trylesinski <[email protected]> Co-authored-by: Ian Davenport <[email protected]> Co-authored-by: Dagang Wei <[email protected]> Co-authored-by: Felix Weinberger <[email protected]> Co-authored-by: Stanley Law <[email protected]> Co-authored-by: Luca Chang <[email protected]> Co-authored-by: leweng <[email protected]> Co-authored-by: Clare Liguori <[email protected]> Co-authored-by: lukacf <[email protected]> Co-authored-by: ihrpr <[email protected]> Co-authored-by: Tapan Chugh <[email protected]> Co-authored-by: Tapan Chugh <[email protected]> Co-authored-by: Yann Jouanin <[email protected]> Co-authored-by: Paul Carleton <[email protected]> Co-authored-by: Sreenath Somarajapuram <[email protected]> Co-authored-by: Omer Korner <[email protected]> Co-authored-by: joesavage-silabs <[email protected]> Co-authored-by: Gregory L <[email protected]> Co-authored-by: David Soria Parra <[email protected]> Co-authored-by: Moustapha Ebnou <[email protected]> Co-authored-by: Max Isbey <[email protected]> Co-authored-by: Claude <[email protected]> Co-authored-by: Jerome <[email protected]> Co-authored-by: xavier <[email protected]> Co-authored-by: keurcien <[email protected]> Co-authored-by: Tim Esler <[email protected]> Co-authored-by: San Nguyen <[email protected]> Co-authored-by: Justin Wang <[email protected]> Co-authored-by: jess <[email protected]> Co-authored-by: Peter Alexander <[email protected]> Co-authored-by: Reid Geyer <[email protected]> Co-authored-by: Eleftheria Stein-Kousathana <[email protected]> Co-authored-by: Christian Clauss <[email protected]> Co-authored-by: pchoudhury22 <[email protected]> Co-authored-by: owengo <[email protected]> Co-authored-by: Olivier Schiavo <[email protected]> Co-authored-by: Steve Billings <[email protected]> Co-authored-by: Mike Salvatore <[email protected]> Co-authored-by: pengwa <[email protected]> Co-authored-by: Your Name <[email protected]> Co-authored-by: Jon Shea <[email protected]> Co-authored-by: automaton82 <[email protected]> Co-authored-by: Yukuan Jia <[email protected]> Co-authored-by: Lorenzo <[email protected]> Co-authored-by: ZhangChuanhui <[email protected]> Co-authored-by: zhangchuanhui <[email protected]> Co-authored-by: Marcus Shu <[email protected]> Co-authored-by: Brandon Wu <[email protected]> Co-authored-by: Dogacan Colak <[email protected]> Co-authored-by: AishwaryaKalloli <[email protected]> Co-authored-by: lorenss-m <[email protected]> Co-authored-by: Rocky Haotian Du <[email protected]> Co-authored-by: Fenn Bailey <[email protected]> Co-authored-by: daamitt <[email protected]> Co-authored-by: Mat Leonard <[email protected]> Co-authored-by: Samuel Felipe Chenatti <[email protected]> Co-authored-by: Brandon Shar <[email protected]> Co-authored-by: mingo007 <[email protected]> Co-authored-by: adam jones <[email protected]> Co-authored-by: Yann Jouanin <[email protected]> Co-authored-by: Koichi ITO <[email protected]> Co-authored-by: Cole Murray <[email protected]> Co-authored-by: inaku <[email protected]> Co-authored-by: Chris Coutinho <[email protected]> Co-authored-by: Paul Carleton <[email protected]> Co-authored-by: Camila Rondinini <[email protected]> Co-authored-by: Victorien <[email protected]> Co-authored-by: Andrii Blyzniuk <[email protected]> Co-authored-by: Liang Wu <[email protected]> Co-authored-by: adam jones <[email protected]> Co-authored-by: Olivier Chafik <[email protected]> Co-authored-by: Tyler Mailman <[email protected]> Co-authored-by: TheMailmans <[email protected]> Co-authored-by: Edison <[email protected]> Co-authored-by: dvlpjrs <[email protected]>

maxisbey added 2 commits November 13, 2025 17:51

maxisbey requested a review from pcarleton November 13, 2025 18:09

Merge branch 'main' into fix-oauth-discovery-fallback

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pcarleton approved these changes Nov 13, 2025

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pcarleton merged commit 91ccdb3 into main Nov 13, 2025
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pcarleton deleted the fix-oauth-discovery-fallback branch November 13, 2025 19:37

LucaButBoring pushed a commit to LucaButBoring/mcp-python-sdk that referenced this pull request Nov 17, 2025

Fix OAuth discovery fallback and URL ordering (modelcontextprotocol#1624

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Fix OAuth discovery fallback and URL ordering #1624

Fix OAuth discovery fallback and URL ordering #1624

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maxisbey commented Nov 13, 2025

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Fix OAuth discovery fallback and URL ordering #1624

Fix OAuth discovery fallback and URL ordering #1624

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maxisbey commented Nov 13, 2025

Motivation and Context

Issue #1495: Legacy Server Compatibility

Issue #1623: Incorrect OAuth Discovery URL Priority

Changes

1. Enable Fallback to March 2025 Spec (Issue #1495)

2. Fix OAuth Discovery URL Ordering (Issue #1623)

Implementation Details

Examples

Example 1: Legacy Server (No PRM)

Example 2: Path-Aware Discovery

Example 3: Root Authorization Server

Breaking Changes

Testing

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