Fix the TaskGroup hanging on stdin_writer when stdio_client exiting

LionNatsu · web-flow · commit 22e2b3a9cf31 · 2025-04-22T14:46:12.000+08:00
Triggers a TaskGroup cancel after reaching the finally code block.
diff --git a/src/mcp/client/stdio/__init__.py b/src/mcp/client/stdio/__init__.py
@@ -177,6 +177,7 @@ async def stdin_writer():
                 await terminate_windows_process(process)
             else:
                 process.terminate()
+            tg.cancel_scope.cancel()
 
 
 def _get_executable_command(command: str) -> str:
