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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 v2.1.239

Subagents can report that they are blocked

You'll notice
Useful3 Signal4
Subagents

A subagent can now report itself as blocked instead of claiming it succeeded or failed.

What

The status a subagent reports back to the session that launched it now includes blocked, alongside completed, failed and killed, so a task that is stuck waiting on something can say so instead of being forced to claim success or failure.

Details
  • The change is in the instructions given to the model, in the notification format it fills in for finished tasks.
  • Applies to any session that receives this system prompt section; there is no setting to turn it on or off.
Evidence

<status>completed|failed|killed|blocked</status>

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 v2.1.239 →