Function getAssistantMessageFromError

src/services/api/errors.ts:474–989

(
  error: unknown,
  model: string,
  options?: {
    messages?: Message[]
    messagesForAPI?: (UserMessage | AssistantMessage)[]
  },
)

}

export function getAssistantMessageFromError(
  error: unknown,
  model: string,
  options?: {
    messages?: Message[]
    messagesForAPI?: (UserMessage | AssistantMessage)[]
  },
): AssistantMessage {
  // Check for SDK timeout errors
  if (
    error instanceof APIConnectionTimeoutError ||
    (error instanceof APIConnectionError &&
      error.message.toLowerCase().includes('timeout'))
  ) {
    return createAssistantAPIErrorMessage({
      content: API_TIMEOUT_ERROR_MESSAGE,
      error: 'unknown',
    })
  }

  // Check for image size/resize errors (thrown before API call during validation)
  // Use getImageTooLargeErrorMessage() to show "esc esc" hint for CLI users
  // but a generic message for SDK users (non-interactive mode)
  if (error instanceof ImageSizeError || error instanceof ImageResizeError) {
    return createAssistantAPIErrorMessage({
      content: getImageTooLargeErrorMessage(),
    })
  }

  // Check for emergency capacity off switch for Opus PAYG users
  if (
    error instanceof Error &&
    error.message.includes(CUSTOM_OFF_SWITCH_MESSAGE)
  ) {
    return createAssistantAPIErrorMessage({
      content: CUSTOM_OFF_SWITCH_MESSAGE,
      error: 'rate_limit',
    })
  }

  if (
    error instanceof APIError &&
    error.status === 429 &&
    shouldProcessRateLimits(hasCurrentOauthBackedFirstPartyErrorSession())
  ) {
    // Check if this is the new API with multiple rate limit headers
    const rateLimitType = error.headers?.get?.(
      'anthropic-ratelimit-unified-representative-claim',
    ) as 'five_hour' | 'seven_day' | 'seven_day_opus' | null

    const overageStatus = error.headers?.get?.(
      'anthropic-ratelimit-unified-overage-status',
    ) as 'allowed' | 'allowed_warning' | 'rejected' | null

    // If we have the new headers, use the new message generation
    if (rateLimitType || overageStatus) {
      // Build limits object from error headers to determine the appropriate message
      const limits: ClaudeAILimits = {