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streamable_http client call_tool hangs when receiving invalid JSONRPCMessage

bugSomething isn't workingSomething isn't working

P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

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

Status: Closed (completed).

#1144 In modelcontextprotocol/python-sdk;

· by Nuclear2 was closed on Feb 9, 2026

context.report_progress not sending notifications on streamable-http

bugSomething isn't workingSomething isn't working

P3Nice to haves, rare edge casesNice to haves, rare edge cases

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

Status: Closed (completed).

#953 In modelcontextprotocol/python-sdk;

· by abdhx was closed on Feb 18, 2026

Issue: Custom HTTP Headers (e.g., mcp-session-id) Not Received by FastMCP Server

bugSomething isn't workingSomething isn't working

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: Closed (completed).

#1063 In modelcontextprotocol/python-sdk;

· by hileamlakB was closed on Feb 19, 2026

Race Condition in StreamableHTTP Transport Causes ClosedResourceError

bugSomething isn't workingSomething isn't working

P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

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

Status: Closed (completed).

#1363 In modelcontextprotocol/python-sdk;

· by Edison-A-N was closed on Dec 2, 2025

MCP server in the HTTP Streamable mode broken

bugSomething isn't workingSomething isn't working

P1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested feature

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

Status: Closed (completed).

#1190 In modelcontextprotocol/python-sdk;

· by akolotov was closed on Dec 4, 2025

Errors with Streamble HTTP

bugSomething isn't workingSomething isn't working

needs confirmationNeeds confirmation that the PR is actually required or needed.Needs confirmation that the PR is actually required or needed.

Status: Not planned (skipped).

#1072 In modelcontextprotocol/python-sdk;

· by pavankay was closed on Dec 3, 2025

Timeout on client if MCP server doesnt support event-stream

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: Not planned (skipped).

#1403 In modelcontextprotocol/python-sdk;

· by ShadyRoll was closed on Dec 4, 2025