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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

Workflow-spawned agents resolve their own model before inheriting

Under the hood
Useful1 Signal2
Workflows

Workflow-spawned agents resolve a model themselves before falling back to the main one.

What

An agent started by a workflow used to always take the main loop's model when none was given. It now consults a model resolution step first and only falls back to the main loop model when that step says "inherit". An explicit model on the call still wins.

Details
  • What the resolution step reads, and so what makes it return something other than "inherit", is not visible in the shipped code.
Evidence

N !== "inherit" ? N : F.options.mainLoopModel

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 →