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https://github.com/anthropics/claude-code-sdk-python.git
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## Problem ClaudeSDKClient initialization would hang indefinitely on Windows, timing out after 60 seconds. The SDK successfully spawned the Claude CLI subprocess but control requests sent via stdin never reached the subprocess due to Windows subprocess stdin buffering behavior with Python's asyncio. ## Root Cause On Windows, when using asyncio subprocess streams, data written to stdin can remain buffered and not immediately sent to the child process. The CLI subprocess waits for the initialization request that's stuck in Python's buffer, causing the 60-second timeout. ## Solution 1. Added `flush_stdin()` method to Transport base class (non-abstract, default no-op) 2. Implemented Windows-specific flush in SubprocessCLITransport that calls `drain()` on the asyncio StreamWriter when available 3. Call `flush_stdin()` after all control protocol writes in Query class: - After sending control requests (_send_control_request) - After responding to incoming requests (_handle_control_request) ## Tests Added - test_flush_stdin_on_windows: Verifies drain() called on Windows - test_flush_stdin_on_non_windows: Verifies no-op on other platforms - test_flush_stdin_without_process: Tests graceful handling of missing process - test_flush_stdin_fallback_to_inner_stream: Tests wrapped stream fallback - test_flush_stdin_called_after_control_requests: Integration test for outgoing requests - test_flush_stdin_called_after_control_responses: Integration test for incoming requests All tests pass on macOS, and the fix is platform-specific to Windows only. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> |
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| .. | ||
| conftest.py | ||
| test_changelog.py | ||
| test_client.py | ||
| test_errors.py | ||
| test_integration.py | ||
| test_message_parser.py | ||
| test_sdk_mcp_integration.py | ||
| test_streaming_client.py | ||
| test_subprocess_buffering.py | ||
| test_tool_callbacks.py | ||
| test_transport.py | ||
| test_types.py | ||