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Title: Suppress KeyboardInterrupt tracebacks from MCPServer.run by koriyoshi2041 · Pull Request #2778 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Suppress KeyboardInterrupt tracebacks from MCPServer.run by koriyoshi2041 · Pull Request #2778 · modelcontextprotocol/python-sdk

X Title: Suppress KeyboardInterrupt tracebacks from MCPServer.run by koriyoshi2041 · Pull Request #2778 · modelcontextprotocol/python-sdk

Description: Problem Interrupting an MCPServer.run(transport="stdio") process with Ctrl-C can surface the full AnyIO/asyncio cancellation traceback even though the server is just shutting down. Issue #2663 is marked ready for work and points to the sync run() boundary as the narrow fix point. Fix Wrap the transport dispatch in MCPServer.run() with a KeyboardInterrupt guard so user interrupts return cleanly. Other exceptions still propagate. Tests uv run pytest tests/server/mcpserver/test_server.py uv run ruff format --check src/mcp/server/mcpserver/server.py tests/server/mcpserver/test_server.py uv run ruff check src/mcp/server/mcpserver/server.py tests/server/mcpserver/test_server.py uv run pyright src/mcp/server/mcpserver/server.py tests/server/mcpserver/test_server.py git diff --check Risk Low. The guard is only at the synchronous run() entry point and only handles KeyboardInterrupt; ordinary startup/runtime exceptions are still re-raised. Fixes #2663

Open Graph Description: Problem Interrupting an MCPServer.run(transport="stdio") process with Ctrl-C can surface the full AnyIO/asyncio cancellation traceback even though the server is just shutting down. Issue ...

X Description: Problem Interrupting an MCPServer.run(transport="stdio") process with Ctrl-C can surface the full AnyIO/asyncio cancellation traceback even though the server is just shutting down...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2778

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67e7276 Handle KeyboardInterrupt in server run koriyoshi2041 Jun 4, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2778/commits/67e72766214aa15fdc6056418f5de81bd06cc01d
a29936c tolerate stdio subprocess warnings koriyoshi2041 Jun 4, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2778/commits/a29936c2f64628463ab0216da21b902f4bfd914d
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