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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.

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Claude Code v2.1.202

Unified Credential Error Messages for Cloud Providers

The separate error strings for each cloud credential provider (Bedrock, Vertex, Foundry, Mantle, Anthropic-on-AWS) have been consolidated into a single generic credential error factory.

Details
  • All credential providers now use: "[Provider] credentials are managed by the desktop app, but none are available. The app may have quit or its credential file is stale — restart the desktop app."
  • A new explicit message for incompatible credential types: "Background agents and teammates are not supported for this credential kind. Run this from the main session, or switch the desktop app to a profile-based or API-key credential. If this is the main session, restart the desktop app."
  • AWS credential detection now uses Pqs() to read AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_PROFILE, AWS_CONFIG_FILE, and AWS_SHARED_CREDENTIALS_FILE
Evidence

Credential error factory (search for "host-managed provider credentials unavailable" and "Background agents and teammates are not supported for this credential kind")

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.202 →