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docs(schema): ignore cancel_request for unknown or answered requests - #2672
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$/cancel_requestsaid a receiver must send a response for the original request, with no exception for requests that are unknown or already answered, so a literal reading led to a second response.On v2 cancellation (stable and draft) and the
$/cancel_requestRust/schema doc, receivers MUST ignore a$/cancel_requestfor an unknown or already-answered request ID and MUST NOT send a second response, as in MCP 2026-07-28. No sender-side rule is added, per the discussion on #2636. v2 only.