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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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.

Reference / Environment variables

AWS_REGION

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.138, including the newest one read.

What it is

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

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.228.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.160 – 2.1.243 75 releases in the build str —
2.1.138 – 2.1.159 20 releases in the build — —

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Changelog entries naming it

  1. v2.1.232A malformed AWS region env var is now ignored and reported

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

    named in this entry

  2. v2.1.232Invalid AWS region environment values are reported instead of hidden

    An invalid AWS_REGION is now reported as invalid rather than silently treated as default.

    named in this entry

  3. v2.1.232Invalid 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.

    named in this entry

  4. v2.1.228Bedrock no longer fails when neither a region nor a base URL is set

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

    named in this entry

Documentation pages

A reference table page is one whose own table defines this name, and it is where the description above came from. A page that mentions it carries the name somewhere in its text and may say nothing about it at all. Every page carrying it.

Names beside it

Every environment variable in the inventory starting aws, up to twelve of them.

AWS_ACCESS_KEY_IDNo description from anybody. 2.1.138 AWS_BEARER_TOKEN_BEDROCKAmazon Bedrock API key for authentication (see [Amazon Bedrock API keys](https://aws.amazon.com/blogs/machine-learning/accelerate-ai-development-with-amazon-bedrock-api-keys/)) 2.1.138 AWS_CONFIG_FILEAWS SSO profile logins resolve faster via a direct fast path, falling back if anything unusual is configured. 2.1.172 AWS_CONTAINER_CREDENTIALS_FULL_URINo description from anybody. 2.1.178 AWS_CONTAINER_CREDENTIALS_RELATIVE_URINo description from anybody. 2.1.178 AWS_DEFAULT_REGIONA malformed AWS region variable is now ignored, falling back to us-east-1. 2.1.138 AWS_ENDPOINT_URLNo description from anybody. 2.1.239 AWS_ENDPOINT_URL_STSNo description from anybody. 2.1.239 AWS_EXECUTION_ENVNo description from anybody. 2.1.138 AWS_LAMBDA_BENCHMARK_MODENo description from anybody. 2.1.138 AWS_LAMBDA_FUNCTION_NAMENo description from anybody. 2.1.138 AWS_LOGIN_CACHE_DIRECTORYNo description from anybody. 2.1.138

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the environment variable does. All environment variables.