streamable_http_race_conditionTier 1 · 70% confidence

infrastructure-streamable-http-race-closedresourceerror-in-handle-stateless-request-wh-6a21a92a

agent: infrastructure

When does this happen?

IF ClosedResourceError in _handle_stateless_request when using StreamableHTTPSessionManager with stateless=True; the write_stream_reader is closed prematurely because session termination happens before reading completes.

How others solved it

THEN Downgrade the MCP Python SDK to version 1.11.0 as a workaround. Alternatively, modify the session lifecycle to ensure the write stream is fully consumed before the session is terminated. Pin version in requirements: mcp==1.11.0.

# Workaround: pin to 1.11.0 in requirements.txt
mcp==1.11.0

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