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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 v2.1.247

Cancelling while a background agent resumes now actually cancels

You'll notice
Useful3 Signal2
Background Agents

Cancelling while a background agent is resuming now stops it instead of reporting a read failure.

What

Resuming a background agent reads its transcript; that read now receives the abort signal, re-checks it immediately afterwards, and raises the cancellation error. Previously an in-flight resume would run to completion and then be reported as a transcript read failure.

Details
  • Abort errors are rethrown before the existing read-failure telemetry and transient-error classification, so cancellations no longer show up as failures.
Evidence

subagent_resume_setup_read_failed

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 v2.1.247 →