get_feed_headlines

Instructions

Implementation Reference

• src/index.ts:457-502 (handler)

  The execute handler function for the 'get_feed_headlines' tool. It fetches the RSS feed (using cache or rssReader), extracts and formats headlines based on the specified format (markdown, html, text, or json), and returns a structured JSON output with feed metadata and list of headlines.

  execute: async (args, context) => {
    logger.info(`Getting headlines from: ${args.url}`);
  
    // Fetch feed
    let feed: FeedResult | null = feedCache.get(args.url);
    if (!feed) {
      feed = await rssReader.fetchFeed(args.url);
      feedCache.set(args.url, feed);
    }
  
    // Format headlines
    const formatHeadline = (item: FeedItem) => {
      const headline = {
        title: item.title,
        summary: item.description || item.content,
        url: item.url,
        published: item.published,
        author: item.author,
      };
  
      switch (args.format) {
        case "markdown":
          return `### [${headline.title}](${headline.url})\n${headline.summary}`;
        case "html":
          return `<h3><a href="${headline.url}">${headline.title}</a></h3><p>${headline.summary}</p>`;
        case "text":
          return `${headline.title}\n${headline.summary}\n${headline.url}`;
        case "json":
        default:
          return headline;
      }
    };
  
    const headlines = feed.items.map(formatHeadline);
  
    const output = {
      feedTitle: feed.info.title,
      feedUrl: args.url,
      itemCount: feed.items.length,
      format: args.format,
      headlines,
    };
  
    logger.info(`Got ${headlines.length} headlines from ${args.url}`);
    return JSON.stringify(output, null, 2);
  },

• src/index.ts:443-450 (schema)

  Zod schema defining the input parameters for the 'get_feed_headlines' tool: required 'url' for the RSS feed and optional 'format' (default 'json') for output formatting.

  const GetFeedHeadlinesSchema = z.object({
    url: z.string().describe("The RSS feed URL to get headlines from"),
    format: z
      .enum(["markdown", "text", "html", "json"])
      .optional()
      .default("json")
      .describe("Output format for the headlines"),
  });

• src/index.ts:452-503 (registration)

  Registration of the 'get_feed_headlines' tool with the FastMCP server, specifying name, description, input schema, and inline execute handler.

  server.addTool({
    name: "get_feed_headlines",
    description:
      "Gets a list of headlines from a feed, including title, summary, and URL.",
    parameters: GetFeedHeadlinesSchema,
    execute: async (args, context) => {
      logger.info(`Getting headlines from: ${args.url}`);
  
      // Fetch feed
      let feed: FeedResult | null = feedCache.get(args.url);
      if (!feed) {
        feed = await rssReader.fetchFeed(args.url);
        feedCache.set(args.url, feed);
      }
  
      // Format headlines
      const formatHeadline = (item: FeedItem) => {
        const headline = {
          title: item.title,
          summary: item.description || item.content,
          url: item.url,
          published: item.published,
          author: item.author,
        };
  
        switch (args.format) {
          case "markdown":
            return `### [${headline.title}](${headline.url})\n${headline.summary}`;
          case "html":
            return `<h3><a href="${headline.url}">${headline.title}</a></h3><p>${headline.summary}</p>`;
          case "text":
            return `${headline.title}\n${headline.summary}\n${headline.url}`;
          case "json":
          default:
            return headline;
        }
      };
  
      const headlines = feed.items.map(formatHeadline);
  
      const output = {
        feedTitle: feed.info.title,
        feedUrl: args.url,
        itemCount: feed.items.length,
        format: args.format,
        headlines,
      };
  
      logger.info(`Got ${headlines.length} headlines from ${args.url}`);
      return JSON.stringify(output, null, 2);
    },
  });