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Title: fix: don't send a response for cancelled requests by Zelys-DFKH · Pull Request #2493 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: don't send a response for cancelled requests by Zelys-DFKH · Pull Request #2493 · modelcontextprotocol/python-sdk

X Title: fix: don't send a response for cancelled requests by Zelys-DFKH · Pull Request #2493 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix: don't send a response for cancelled requests by Zelys-DFKH · Pull Request #2493 · modelcontextprotocol/python-sdk

Open Graph Description: Summary Remove the _send_response call from RequestResponder.cancel(). The MCP cancellation spec says receivers must not send a response for a cancelled request. When send_notification is called w...

X Description: Summary Remove the _send_response call from RequestResponder.cancel(). The MCP cancellation spec says receivers must not send a response for a cancelled request. When send_notification is called w...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2493

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Apr 22, 2026https://github.com/modelcontextprotocol/python-sdk/pull/2493#issue-4312350241
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May 18, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2493#ref-pullrequest-4294949100
fix: stop sending JSON-RPC response on request cancellation #2481 https://github.com/modelcontextprotocol/python-sdk/pull/2481
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RequestResponder.cancel sends JSON-RPC response, violating cancellation spec https://github.com/modelcontextprotocol/python-sdk/issues/2480
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