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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.219

Queued-command cancellations are acknowledged once

You'll notice
Useful2 Signal0
Elsewhere

Cancelled queued commands are reported once and no longer linger in the interrupt receipt.

What

A queued command whose cancellation was already reported no longer produces a second cancelled event, and no longer appears as still queued in the interrupt receipt.

Details
  • the command queue gained consumeCancelPendingAcked and hasCancelPendingAcked on top of the existing cancel-pending marks
  • commands whose "cancelled" lifecycle event was already emitted are skipped on later passes
  • those commands are filtered out of the still_queued list in the interrupt receipt sent to SDK clients
Evidence

still_queued

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.219 →