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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 v2.1.242

SDK interrupt() can cancel queued messages and reports which ones

Use it now
Useful3 Signal2
Agents Notable not in their notes

SDK interrupt can now cancel queued messages and tells you which ones it cancelled.

cancelQueued
What

In the Agent SDK, interrupt() now accepts an options object. Passing cancelQueued: true also cancels messages waiting in the queue, and the resolved value includes a cancelled list of message ids alongside the existing still_queued. Previously it took no arguments.

Details
  • cancelQueued: true adds cancel_queued: true to the control request sent to the CLI.
  • Available to any SDK caller on this build, with no flag.
  • The surrounding SDK transport and query code was re-bundled from lazily loaded module wrappers into plain top-level classes, with no behaviour change.
Usage
const result = await query.interrupt({ cancelQueued: true });
console.log(result.cancelled, result.still_queued);
Evidence

cancel_queued

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.242 →