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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 v2.1.227

Task tool pushed harder toward background agents

You'll notice
Useful3 Signal2
Subagents not in their notes

Expect more subagents to run in the background rather than blocking your turn.

run_in_background
What

The description of the Task tool's run_in_background option was rewritten to discourage waiting on agents. Foreground is now reserved for the case where the very next step depends on that agent's answer and nothing else useful could happen in the meantime, so expect more subagents to run in the background.

Evidence

Set to false only when your very next action depends on this agent's result and nothing else could usefully happen while it runs

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 →