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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.

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Claude Code v2.1.227

Auth failures now name the credential source

You'll notice
Useful3 Signal1
Auth

Auth failures now name where the bad credential came from, like your custom headers.

ANTHROPIC_CUSTOM_HEADERS
What

When a request is rejected and the credentials came from headers rather than a plain API key, the error now names the actual source: ANTHROPIC_CUSTOM_HEADERS, an external auth token, or an external API key, with the server's own message appended after a middot.

Details
  • Previously these fell through to the generic x-api-key wording, which pointed at a setting the user was not using.
  • Credentials from a managed key or from a claude.ai login are classified as an authentication failure instead.
Evidence

Invalid ANTHROPIC_CUSTOM_HEADERS

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 v2.1.227 →