fix: handle transport close race condition in control request responses#492
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fix: handle transport close race condition in control request responses#492drillan wants to merge 1 commit intoanthropics:mainfrom
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This was referenced Jan 19, 2026
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Use forked branch to resolve ProcessTransport error when using SDK MCP servers with string prompts. - Add [tool.uv.sources] to use forked branch - Bump version from 0.0.3 to 0.0.4 Upstream PR: anthropics/claude-agent-sdk-python#492 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
When the CLI process exits immediately after processing the final message, the transport may close before we can send the control response. This caused unhandled CLIConnectionError exceptions. Wrap transport.write calls in _handle_control_request with try/except to gracefully handle the race condition when the transport is already closed. Other exceptions still propagate normally. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
CLIConnectionErrorexceptions during_handle_control_requesttransport.writecalls withtry/except CLIConnectionErrorto gracefully handle the race conditionChanges
CLIConnectionErrorimport toquery.pytransport.writecalls in_handle_control_requestwithtry/exceptto handle transport close race conditionTest plan
test_query_control_request.pywith 6 test cases:Related to #386
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