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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 v2.1.248

Workflow subagents must answer through a tool call

Under the hood
Useful2 Signal3
Workflows

Workflow subagents must reply through a structured tool call and retry once on schema failure.

What

Subagents started by workflow orchestration get a system prompt requiring the answer to come back as one specific structured tool call rather than as text, and to retry once if the schema validation fails before ending the turn.

Evidence

Do NOT put your answer in a text response.

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 v2.1.248 →