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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

Subagent model lookup restructured around a single resolver

Under the hood
Useful2 Signal2
Subagents

Subagent model inheritance runs through one resolver, with a Bedrock family mapping check added.

What

The code deciding which model a subagent inherits was consolidated into one resolver, replacing the previous two-step flow, with an added check for Bedrock model family mapping before falling back.

Details
  • The CLAUDE_CODE_SUBAGENT_MODEL environment variable is still honored.
Evidence

CLAUDE_CODE_SUBAGENT_MODEL

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 v2.1.251 →