A Claude Code environment variable, read out of the shipped bundle.
It has been in the build since v2.1.207, including the newest one read.
Time in milliseconds Claude Code waits for the AWS default credential provider chain to produce credentials before the request fails with AWS default-chain credential resolve timed out (default: 60000). Raise it when a step in your chain legitimately needs longer, such as a browser-based SSO sign-in with MFA through a wrapper like aws-vault. Applies wherever Claude Code signs with the default chain: Amazon Bedrock, Claude Platform on AWS, and the Mantle endpoint. Requires Claude Code v2.1.207 or later
The earliest release whose published evidence quoted CLAUDE_CODE_AWS_CHAIN_RESOLVE_TIMEOUT_MS was v2.1.207, 10 Jul 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
v2.1.207 – v2.1.30991 builds10 Jul 2026 → 22 Oct 2026 ◆in the build
Build by build
91
One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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.
