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ClientConfig has inconsistent naming: message_handler should be message_callback

Status: Open.

#2588 In modelcontextprotocol/python-sdk;

· fuyu-quant opened on May 13, 2026

Add dereference helper for tool inputSchema with nested Pydantic models

Status: Open.

#2586 In modelcontextprotocol/python-sdk;

· Burton-David opened on May 13, 2026

Race condition between SSE session init and tools/call rejection (-32602)

Status: Open.

#2583 In modelcontextprotocol/python-sdk;

· hyoseop1231 opened on May 13, 2026

Expose schema_generator on FastMCP for tool params schema generation

Status: Open.

#2582 In modelcontextprotocol/python-sdk;

· leowonglaw opened on May 13, 2026

Types-only install option

Status: Open.

#2581 In modelcontextprotocol/python-sdk;

· KoolADE85 opened on May 12, 2026

Claude Code client sends tools/call without initialize handshake — SSE transport rejects with -32602

Status: Open.

#2579 In modelcontextprotocol/python-sdk;

· Aksels73 opened on May 12, 2026

OAuth token refresh sends RFC 8707 resource parameter that Entra ID v2.0 rejects (AADSTS9010010)

authIssues and PRs related to Authentication / OAuthIssues and PRs related to Authentication / OAuth

bugSomething isn't workingSomething isn't working

fix proposedBot has a verified fix diff in the commentBot has a verified fix diff in the comment

P2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable feature

ready for workEnough information for someone to start working onEnough information for someone to start working on

Status: Open.

#2578 In modelcontextprotocol/python-sdk;

· ShaneFlag opened on May 12, 2026

MCP client does not retry authenticated request after successful OAuth token exchange

authIssues and PRs related to Authentication / OAuthIssues and PRs related to Authentication / OAuth

bugSomething isn't workingSomething isn't working

needs reproneeds additional information to be able to reproduce bugneeds additional information to be able to reproduce bug

Status: Open.

#2577 In modelcontextprotocol/python-sdk;

· jkgibson-source opened on May 11, 2026

fix: 4 additional raise sites missing exception chaining with 'from'

Status: Open.

#2575 In modelcontextprotocol/python-sdk;

· siddhirajkatkar opened on May 11, 2026

feat: Add distributed EventStore implementations (Redis, PostgreSQL) for production deployments

Status: Open.

#2570 In modelcontextprotocol/python-sdk;

· Kevin990001 opened on May 11, 2026

raise without from discards exception chain in 12 remaining sites

Status: Open.

#2564 In modelcontextprotocol/python-sdk;

· blackwell-systems opened on May 8, 2026

how to return images from an mcp server

questionFurther information is requestedFurther information is requested

Status: Open.

#2557 In modelcontextprotocol/python-sdk;

· JINO-ROHIT opened on May 8, 2026