Method executeFallback

packages/core/src/tools/web-fetch.ts:76–137

(signal: AbortSignal)

  }

  private async executeFallback(signal: AbortSignal): Promise<ToolResult> {
    const urls = extractUrls(this.params.prompt);
    if (urls.length === 0) {
      return {
        llmContent: 'Error: No URL found in the prompt for fallback.',
        returnDisplay: 'Error: No URL found in the prompt for fallback.',
      };
    }
    // For now, we only support one URL for fallback
    let url = urls[0];

    // Convert GitHub blob URL to raw URL
    if (url.includes('github.com') && url.includes('/blob/')) {
      url = url
        .replace('github.com', 'raw.githubusercontent.com')
        .replace('/blob/', '/');
    }

    try {
      const response = await fetchWithTimeout(url, URL_FETCH_TIMEOUT_MS);
      if (!response.ok) {
        throw new Error(
          `Request failed with status code ${response.status} ${response.statusText}`,
        );
      }
      const html = await response.text();
      const textContent = convert(html, {
        wordwrap: false,
        selectors: [
          { selector: 'a', options: { ignoreHref: true } },
          { selector: 'img', format: 'skip' },
        ],
      }).substring(0, MAX_CONTENT_LENGTH);

      const anusClient = this.config.getAnusClient();
      const fallbackPrompt = `The user requested the following: "${this.params.prompt}".

I was unable to access the URL directly. Instead, I have fetched the raw content of the page. Please use the following content to answer the request. Do not attempt to access the URL again.

---
${textContent}
---
`;
      const result = await anusClient.generateContent(
        [{ role: 'user', parts: [{ text: fallbackPrompt }] }],
        {},
        signal,
      );
      const resultText = getResponseText(result) || '';
      return {
        llmContent: resultText,
        returnDisplay: `Content for ${url} processed using fallback fetch.`,
      };
    } catch (e) {
      const error = e as Error;
      const errorMessage = `Error during fallback fetch for ${url}: ${error.message}`;
      return {
        llmContent: `Error: ${errorMessage}`,