Source Intelligence

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.

All of v2.1.227 Home All releases olderv2.1.226 v2.1.228newer
Claude Code v2.1.227

Task tool is stricter about when to run an agent in the foreground

You'll notice
Useful3 Signal2
Subagents

Claude keeps subagents in the foreground only when the very next step needs their answer.

What

The guidance for launching a subagent used to say run it in the foreground whenever you need the result before proceeding. It now limits that to cases where the very next action depends on the result and nothing else could usefully happen in the meantime, and names fire-and-forget work and independent investigations as background cases.

Evidence

Wanting the result "next" is not enough on its own.

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 v2.1.227 →