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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 v2.1.232

A malformed AWS region env var is now ignored and reported

You'll notice
Useful3 Signal2
Bedrock

A malformed AWS region variable is now ignored, falling back to us-east-1.

AWS_REGIONAWS_DEFAULT_REGION
What

AWS_REGION and AWS_DEFAULT_REGION are checked against a region-shaped pattern before use. A value that fails the check is ignored and the fallback us-east-1 is used, where previously any non-empty value was passed through verbatim.

Details
  • The Bedrock status line says so: "(default — region env var invalid, ignored; fix or unset AWS_REGION / AWS_DEFAULT_REGION)".
  • The region resolver reports its source as env-invalid in that case.
Evidence

DGg = /^[a-z]{2,}(?:-[a-z0-9]+){0,4}$/i;

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 v2.1.232 →