Function classifyAPIError

src/services/api/errors.ts:975–1171

(error: unknown)

 * Returns a standardized error type string suitable for Datadog tagging.
 */
export function classifyAPIError(error: unknown): string {
  // Aborted requests
  if (error instanceof Error && error.message === 'Request was aborted.') {
    return 'aborted'
  }

  // Timeout errors
  if (
    error instanceof APIConnectionTimeoutError ||
    (error instanceof APIConnectionError &&
      error.message.toLowerCase().includes('timeout'))
  ) {
    return 'api_timeout'
  }

  // Check for repeated 529 errors
  if (
    error instanceof Error &&
    error.message.includes(REPEATED_529_ERROR_MESSAGE)
  ) {
    return 'repeated_529'
  }

  // Check for emergency capacity off switch
  if (
    error instanceof Error &&
    error.message.includes(CUSTOM_OFF_SWITCH_MESSAGE)
  ) {
    return 'capacity_off_switch'
  }

  // Rate limiting
  if (error instanceof APIError && error.status === 429) {
    return 'rate_limit'
  }

  // Server overload (529)
  if (
    error instanceof APIError &&
    (error.status === 529 ||
      error.message?.includes('"type":"overloaded_error"'))
  ) {
    return 'server_overload'
  }

  // Prompt/content size errors
  if (
    error instanceof Error &&
    error.message
      .toLowerCase()
      .includes(PROMPT_TOO_LONG_ERROR_MESSAGE.toLowerCase())
  ) {
    return 'prompt_too_long'
  }

  // PDF errors
  if (
    error instanceof Error &&