Function isOAuthAuthError

sdk/src/impl/llm.ts:172–203

* Check if an error is an OAuth authentication error (expired/invalid token). * This indicates we should try refreshing the token.

(error: unknown)

 * This indicates we should try refreshing the token.
 */
function isOAuthAuthError(error: unknown): boolean {
  if (!error || typeof error !== 'object') return false

  // Check status code (handles both 'status' from AI SDK and 'statusCode' from our errors)
  const statusCode = getErrorStatusCode(error)
  if (statusCode === 401 || statusCode === 403) return true

  // Check error message for auth indicators
  const err = error as {
    message?: string
    responseBody?: string
  }
  const message = (err.message || '').toLowerCase()
  const responseBody = (err.responseBody || '').toLowerCase()

  if (message.includes('unauthorized') || message.includes('invalid_token'))
    return true
  if (message.includes('authentication') || message.includes('expired'))
    return true
  if (
    responseBody.includes('unauthorized') ||
    responseBody.includes('invalid_token')
  )
    return true
  if (
    responseBody.includes('authentication') ||
    responseBody.includes('expired')
  )
    return true

  return false
}

function getModelProvider(model: LanguageModel): string {
  if (typeof model === 'string') return model