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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 v2.1.222

Subagent models outside the allowlist step down within their family

You'll notice
Useful3 Signal0
Models

Subagents asking for a disallowed model now drop to the newest allowed model in the same family.

availableModels
What

A subagent or teammate asking for a model that is not in availableModels now falls to the newest allowed model in the same family rather than straight to the parent or default model.

Details
  • Only applies when a same-family allowed model exists; otherwise the old parent/default fallback still runs.
  • Emits telemetry code family_alias_stepped_down and a matching warning log.
Evidence

family_alias_stepped_down

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 v2.1.222 →