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

Model switches now go through a decision check before being applied

You'll notice
Useful3 Signal4
Models

Model switches now pass a decision check first and can be rejected with an error.

What

What was already a rejected-switch telemetry path is now fed by a hook-style decision taken before the switch lands: anything other than proceed rejects it with an error, and a rejected system-prompt switch reports separately. Notices from the decision come back with a successful switch.

Details
  • Always on this code path, not behind a flag.
Evidence

model_switch_rejected

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.251 →