Repository Issue Activity (beta)

#3137 Concurrent requests sharing a JSON-RPC id on one session receive each other's responses

#421 Adding Opentelemetry to MCP SDK

#671 MCP Tool execution hangs indefinitely in stdio mode when calling external Python scripts

#2001 Progress notifications not delivered via SSE in stateless HTTP mode

#3138 OAuth client sends client_id in token body under client_secret_basic (strict servers reject as multiple auth methods)

#1933 Using transport="stdio" closes real stdio, causing ValueError after server exits

#2431 McpError is not pickle-safe and fails to unpickle

#2486 Split the core from the server and client implementations

#2408 Introduce strategy/registry pattern for type handling in _create_output_model()

#1509 Support Per-Request HTTP Headers in call_tool()

#1368 OAuth client should support bi-phasic oauth flows

#992 Support granular OAuth2 flow with state and verifier persistence

#767 Feature Proposal: Modular Router System for MCP Python SDK

#381 Fastmcp tool parameter parsing type error

#3121 Recommended deployment pattern for FastMCP on AWS Lambda using Mangum

#2501 Was it a bad idea to stream the text generation process using Context.report_progress()?

#1625 Running Streamable HTTP Servers

#1521 How to manually set client_id client_secret?

#1512 Add client subscription and server event broadcasting

#1410 Cancelling a Call Tool Request from Client

#1277 How to get environment variables on the server?

#1121 MCP tool proxy, planned pull request. Allowing for Seamless Human or determinism (private keys, etc) in the middle.

#1065 MCP Completion Issue

#1023 Support for Parameter Passing in MCP Configuration and Runtime Context

#837 Type system complexity creating developer friction and maintenance overhead