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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.232 ·

Invalid AWS region variable is called out by name

On Bedrock, an unusable AWS region variable is now named so you can fix or unset it.

You'll notice Improvements
JSON All of v2.1.232
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
BedrockArea: what it touches
ImprovementsKind: in v2.1.232,
ImprovementsSection of the release
What

On Bedrock, if AWS_REGION or AWS_DEFAULT_REGION holds a value Claude Code cannot use, the region display now says the variable was invalid and ignored and tells you to fix or unset it, rather than showing the generic hint to set a region.

Details
  • The AWS client path now waits for the region to resolve and passes it explicitly, so the label and the region actually used agree.
Evidence

region env var invalid, ignored; fix or unset AWS_REGION / AWS_DEFAULT_REGION

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from
Names in the bundleAWS_REGIONAWS_DEFAULT_REGION
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up AWS_REGION, on Claude Code on Amazon Bedrock. * You only need to set `AWS_REGION` to override your AWS profile's region or when your profile has no region. Claude Code resolves the region in this order: amazon-bedrock see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up AWS_REGION, on Claude Code on Amazon Bedrock.

See this entry in the whole of v2.1.232 →

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