{
  "error": "Authentication failed.",
  "detail": "Authentication failed.",
  "error_code": "AUTH_FAILED",
  "retryable": false,
  "request_id": "req_abc123"
}

{
  "error": "Resource not found.",
  "detail": "Resource not found.",
  "error_code": "NOT_FOUND",
  "retryable": false,
  "request_id": "req_abc123"
}

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "input": "<unknown>",
      "ctx": {}
    }
  ]
}

{
  "error": "Rate limit exceeded — retry after backoff.",
  "detail": "Rate limit exceeded — retry after backoff.",
  "error_code": "RATE_LIMITED",
  "retryable": true,
  "request_id": "req_abc123"
}