Function flashFallbackHandler

packages/cli/src/ui/App.tsx:389–468

(
      currentModel: string,
      fallbackModel: string,
      error?: unknown,
    )

  // Set up Flash fallback handler
  useEffect(() => {
    const flashFallbackHandler = async (
      currentModel: string,
      fallbackModel: string,
      error?: unknown,
    ): Promise<boolean> => {
      let message: string;

      if (
        config.getContentGeneratorConfig().authType ===
        AuthType.LOGIN_WITH_GOOGLE
      ) {
        // Use actual user tier if available; otherwise, default to FREE tier behavior (safe default)
        const isPaidTier =
          userTier === UserTierId.LEGACY || userTier === UserTierId.STANDARD;

        // Check if this is a Pro quota exceeded error
        if (error && isProQuotaExceededError(error)) {
          if (isPaidTier) {
            message = `⚡ You have reached your daily ${currentModel} quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To continue accessing the ${currentModel} model today, consider using /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey`;
          } else {
            message = `⚡ You have reached your daily ${currentModel} quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To increase your limits, upgrade to a Anus Code Assist Standard or Enterprise plan with higher limits at https://goo.gle/set-up-anus-code-assist
⚡ Or you can utilize a Anus API Key. See: https://goo.gle/anus-cli-docs-auth#grok-api-key
⚡ You can switch authentication methods by typing /auth`;
          }
        } else if (error && isGenericQuotaExceededError(error)) {
          if (isPaidTier) {
            message = `⚡ You have reached your daily quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To continue accessing the ${currentModel} model today, consider using /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey`;
          } else {
            message = `⚡ You have reached your daily quota limit.
⚡ Automatically switching from ${currentModel} to ${fallbackModel} for the remainder of this session.
⚡ To increase your limits, upgrade to a Anus Code Assist Standard or Enterprise plan with higher limits at https://goo.gle/set-up-anus-code-assist
⚡ Or you can utilize a Anus API Key. See: https://goo.gle/anus-cli-docs-auth#grok-api-key
⚡ You can switch authentication methods by typing /auth`;
          }
        } else {
          if (isPaidTier) {
            // Default fallback message for other cases (like consecutive 429s)
            message = `⚡ Automatically switching from ${currentModel} to ${fallbackModel} for faster responses for the remainder of this session.
⚡ Possible reasons for this are that you have received multiple consecutive capacity errors or you have reached your daily ${currentModel} quota limit
⚡ To continue accessing the ${currentModel} model today, consider using /auth to switch to using a paid API key from AI Studio at https://aistudio.google.com/apikey`;
          } else {
            // Default fallback message for other cases (like consecutive 429s)
            message = `⚡ Automatically switching from ${currentModel} to ${fallbackModel} for faster responses for the remainder of this session.
⚡ Possible reasons for this are that you have received multiple consecutive capacity errors or you have reached your daily ${currentModel} quota limit
⚡ To increase your limits, upgrade to a Anus Code Assist Standard or Enterprise plan with higher limits at https://goo.gle/set-up-anus-code-assist
⚡ Or you can utilize a Anus API Key. See: https://goo.gle/anus-cli-docs-auth#grok-api-key
⚡ You can switch authentication methods by typing /auth`;
          }
        }

        // Add message to UI history
        addItem(