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fix(core): never send notifications/cancelled for the initialize hand… (#2668)

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Co-authored-by: Felix Weinberger <fweinberger@anthropic.com>
Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
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Konstantin Konstantinov 2026-08-17 14:09:11 +03:00 • committed by GitHub
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---
'@modelcontextprotocol/core-internal': patch
'@modelcontextprotocol/client': patch
'@modelcontextprotocol/server': patch
---
Stop sending `notifications/cancelled` for the `initialize` handshake. The spec is explicit that a client MUST NOT attempt to cancel its `initialize` request, but the outbound cancel path fired for any in-flight request: aborting the `AbortSignal` passed to `connect()`, or letting the handshake hit its timeout, put a forbidden cancellation on the wire naming the initialize request id.
The local behaviour is unchanged — the caller's promise still rejects with the same abort/timeout error, and `connect()` still tears the connection down. Only the wire notification is suppressed. Every other method keeps the existing cancellation path.