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HTTP status: 400

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Error message

One of:

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When this error occurs

Discovery found DCR, but a later OAuth step failed: dynamic client registration was rejected, the token exchange (authorization-code or refresh) failed, the authorization server returned a 5xx / network error, or its response didn’t parse. The full low-level detail — endpoint URL, status code, and response body — is logged server-side; provide the response’s log_id to support so they can find it.

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How to fix

  • A transient “authorization server returned an error” — retry.
  • Registration or token rejections usually mean a misconfigured authorization server; check its logs.
  • If the error notes tools are available without authorization, you can use the server open — add its URL to mcp_servers[] without a connection_id.