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Claude API adds the anthropic-workspace-id response header

UpdateVerifiedAdded Sep 22, 2026

Responses now carry the wrkspc_-prefixed ID of the workspace the API key or access token resolved to, including the Default Workspace, making it easier to attribute traffic to workspaces.

Read Anthropic's release notes

https://platform.claude.com/docs/en/release-notes/overview#august-11-2026

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