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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

Agent tool tells subagents when the model choice is ignored

Use it now
Useful2 Signal3
Subagents Notable not in their notes

In coordinator sessions the Agent tool now says when its model choice will be ignored.

CLAUDE_CODE_COORDINATOR_FORCE_WORKER_INHERIT_MODEL
What

In coordinator sessions the Agent tool's model parameter description is built at runtime: with CLAUDE_CODE_COORDINATOR_FORCE_WORKER_INHERIT_MODEL set, it tells the model the parameter is ignored and must not be set; otherwise it warns to set it only when the user explicitly asks. Outside coordinator sessions nothing is appended.

Evidence

CLAUDE_CODE_COORDINATOR_FORCE_WORKER_INHERIT_MODEL

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.248 →