Function isVertexAuthError

src/services/api/withRetry.ts:666–678

(error: unknown)

}

function isVertexAuthError(error: unknown): boolean {
  if (isEnvTruthy(process.env.CLAUDE_CODE_USE_VERTEX)) {
    // SDK-level: google-auth-library fails in prepareOptions() before the HTTP call
    if (isGoogleAuthLibraryCredentialError(error)) {
      return true
    }
    // Server-side: Vertex returns 401 for expired/invalid tokens
    if (error instanceof APIError && error.status === 401) {
      return true
    }
  }
  return false
}

/**
 * Clear GCP auth caches if appropriate.