Claude Code on Claude Platform on AWS changedclaude-platform-on-aws
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258258export AWS_REGION=us-east-1
259259```
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261`ANTHROPIC_AWS_WORKSPACE_ID` is required and is sent on every request as the `anthropic-workspace-id` header. Replace the example `wrkspc_01ABCDEFGHIJKLMN` value with your own workspace ID from your Claude Platform on AWS setup. The base URL is computed from `AWS_REGION` as `https://aws-external-anthropic.{region}.api.aws`. To override the URL directly, set `ANTHROPIC_AWS_BASE_URL`.
261`ANTHROPIC_AWS_WORKSPACE_ID` is required. Claude Code sends it on every request as the `anthropic-workspace-id` header. Replace the example `wrkspc_01ABCDEFGHIJKLMN` value with your own workspace ID from your Claude Platform on AWS setup.
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263Claude Code computes the base URL as `https://aws-external-anthropic.{region}.api.aws` from the AWS region, which it resolves with the [same precedence as Amazon Bedrock](/docs/en/amazon-bedrock#3-configure-claude-code). To override the URL directly, set `ANTHROPIC_AWS_BASE_URL`.
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263265Claude Platform on AWS is opt-in even when AWS credentials are present in your environment. Amazon Bedrock and Microsoft Foundry take precedence in provider routing, so unset `CLAUDE_CODE_USE_BEDROCK` and `CLAUDE_CODE_USE_FOUNDRY` if they're set.
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