Source Intelligence

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

Resumed fork agents use the current model

You'll notice
Useful3 Signal2
Agents

Resumed forked agents now run on your session's current model instead of the one they started with.

What

Resuming an agent that is a fork of the main thread now forces it to inherit the session's current model instead of reusing whatever model was recorded when it was first created. Its tool list and system-prompt override are recomputed the same way a fresh fork's are.

Details
  • Applies to all fork resumes; observer agents are unaffected. Not behind a flag.
Evidence

r?.isObserver ? void 0 : M ? "inherit" : r?.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 →