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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

Bad auth headers reported with their real error code

You'll notice
Useful3 Signal1
Auth

Bad auth header errors now show the real error code, including keys you set yourself.

What

API errors with code invalid_request_header are now logged the same way as invalid API key errors, showing the actual code rather than falling into generic handling. An API key verification failure is also now recognised when the header at fault is an X-Api-Key you supplied yourself rather than one coming from ANTHROPIC_CUSTOM_HEADERS.

Evidence

invalid_request_header

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 →