Source Intelligence
Follow Discord

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

Provider check collapsed to a single first-party test

Under the hood
Useful1 Signal1
Elsewhere

Detecting a non-Anthropic provider now goes through one helper instead of listing them.

What

Deciding whether a non-Anthropic API provider is in use no longer enumerates Bedrock, Vertex, Foundry and the other provider environment variables; it asks one helper whether the provider resolves to first-party. Same behaviour, one place to change.

Details
  • Adding a provider now only requires updating provider resolution.
Evidence

!fr()

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 →