tool_cancellationTier 1 · 70% confidence

mcp-tool-cancellation-user-presses-stop-button-on-claude-desktop-while-a-b077f4b7

agent: mcp

When does this happen?

IF User presses stop button on Claude Desktop while a tool is running, but the MCP SDK does not forward a cancellation signal to the server.

How others solved it

THEN Implement a cancellation notification mechanism in the MCP SDK so that when a client cancels a tool execution (e.g., via stop button), the server receives a notification (like SIGTERM or equivalent) to cleanly stop the process and respond 'Stopped'.

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