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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 v2.1.247

Errors from a missing subagent model now name the model that was sent

You'll notice
Useful3 Signal2
Subagents

A subagent failing on a missing model now tells you exactly which model was sent.

What

When a subagent fails because the model does not exist, the error text now includes the error type, HTTP status, request id and the exact model name sent to the API, and a matching telemetry event records the same plus whether a fallback chain exists and whether the agent is built in.

Evidence

tengu_api_subagent_model_not_found

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 v2.1.247 →