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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 v2.1.223

Notice when a subagent's model is restricted

You'll notice
Useful3 Signal0
Subagents

You now get a warning when a subagent's requested model gets swapped for a different one.

What

Agent queries now report when the model a subagent asked for was not the model it got, instead of silently substituting.

Details
  • Agent queries pass an onModelRestricted callback.
  • The callback raises a medium-priority warning notification, or an informational system message, naming the agent and the substituted model.
Evidence

agent:

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 v2.1.223 →