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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 v2.1.228

Bedrock no longer fails when neither a region nor a base URL is set

You'll notice
Useful3 Signal2
Bedrock

Bedrock no longer refuses to start when no region or base URL is configured.

AWS_REGIONANTHROPIC_AWS_BASE_URL
What

Using the AWS Bedrock provider without AWS_REGION, AWS_DEFAULT_REGION or ANTHROPIC_AWS_BASE_URL previously threw "No AWS region or base URL found." Construction now continues with the base URL left unset.

Evidence

ANTHROPIC_AWS_BASE_URL

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 v2.1.228 →