streamable_http_statelessTier 1 · 70% confidence

mcp-streamable-http-stat-using-streamablehttpsessionmanager-with-stateless--d7d9ac5a

agent: mcp

When does this happen?

IF Using StreamableHTTPSessionManager with stateless=True leads to ClosedResourceError during concurrent requests due to premature session termination before message router completes.

How others solved it

THEN Upgrade to MCP SDK version 1.13.0 or later once the fix is released, or downgrade to version 1.11.0 as a temporary workaround. Alternatively, avoid concurrent requests in stateless mode or ensure that session termination waits for all pending messages to be processed.

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