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OpenAug 10, 2026
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•Last updated 80% complete
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streamable_http client call_tool hangs when receiving invalid JSONRPCMessage
bugSomething isn't workingSomething isn't workingP1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested featureready for workEnough information for someone to start working onEnough information for someone to start working onStatus: Closed (completed).#1144 In modelcontextprotocol/python-sdk;Cannot break out of session.initialize() when using streamable-http
bugSomething isn't workingSomething isn't workingP1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested featureready for workEnough information for someone to start working onEnough information for someone to start working onStatus: Not planned (skipped).#874 In modelcontextprotocol/python-sdk;context.report_progress not sending notifications on streamable-http
bugSomething isn't workingSomething isn't workingP3Nice to haves, rare edge casesNice to haves, rare edge casesready for workEnough information for someone to start working onEnough information for someone to start working onStatus: Closed (completed).#953 In modelcontextprotocol/python-sdk;Issue: Custom HTTP Headers (e.g., mcp-session-id) Not Received by FastMCP Server
bugSomething isn't workingSomething isn't workingP2Moderate issues affecting some users, edge cases, potentially valuable featureModerate issues affecting some users, edge cases, potentially valuable featureready for workEnough information for someone to start working onEnough information for someone to start working onStatus: Closed (completed).#1063 In modelcontextprotocol/python-sdk;Errors with Streamble HTTP
bugSomething isn't workingSomething isn't workingneeds 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;MCP server in the HTTP Streamable mode broken
bugSomething isn't workingSomething isn't workingP1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested featureready for workEnough information for someone to start working onEnough information for someone to start working onStatus: Closed (completed).#1190 In modelcontextprotocol/python-sdk;Timeout on client if MCP server doesnt support event-stream
bugSomething isn't workingSomething isn't workingneeds reproneeds additional information to be able to reproduce bugneeds additional information to be able to reproduce bugStatus: Not planned (skipped).#1403 In modelcontextprotocol/python-sdk;Race Condition in StreamableHTTP Transport Causes ClosedResourceError
bugSomething isn't workingSomething isn't workingP1Significant bug affecting many users, highly requested featureSignificant bug affecting many users, highly requested featureready for workEnough information for someone to start working onEnough information for someone to start working onStatus: Closed (completed).#1363 In modelcontextprotocol/python-sdk;