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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 token and custom header failures now say which value is wrong

You'll notice
Useful3 Signal1
Auth

Bad auth tokens and custom headers now each get a message naming the exact value to fix.

ANTHROPIC_CUSTOM_HEADERS
What

Three specific one-line messages replace a single generic one, so a bad value points at its own source: "Invalid auth token · Fix external auth token", "Invalid ANTHROPIC_CUSTOM_HEADERS · Fix the environment variable", and "Invalid request header from the environment · Fix the environment variable".

Details
  • Which message you get depends on whether the offending value came from ANTHROPIC_CUSTOM_HEADERS or from another header source.
Evidence

Invalid ANTHROPIC_CUSTOM_HEADERS · Fix the environment variable

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 →