Firecrawl MCP Server

Instructions

{
  "name": "firecrawl_crawl",
  "arguments": {
    "url": "https://example.com/blog/*",
    "maxDiscoveryDepth": 5,
    "limit": 20,
    "allowExternalLinks": false,
    "deduplicateSimilarURLs": true,
    "sitemap": "include"
  }
}

Implementation Reference

• src/index.ts:510-520 (handler)

  The handler function that executes the firecrawl_crawl tool. It extracts the URL and options from arguments, cleans the options, creates a Firecrawl client, logs the action, calls client.crawl(), and returns the result as text.

  execute: async (args, { session, log }) => {
    const { url, ...options } = args as Record<string, unknown>;
    const client = getClient(session);
    const cleaned = removeEmptyTopLevel(options as Record<string, unknown>);
    log.info('Starting crawl', { url: String(url) });
    const res = await client.crawl(String(url), {
      ...(cleaned as any),
      origin: ORIGIN,
    });
    return asText(res);
  },

• src/index.ts:480-509 (schema)

  Zod schema defining the input parameters for the firecrawl_crawl tool, including url, optional prompts, paths, limits, and scrape options.

  parameters: z.object({
    url: z.string(),
    prompt: z.string().optional(),
    excludePaths: z.array(z.string()).optional(),
    includePaths: z.array(z.string()).optional(),
    maxDiscoveryDepth: z.number().optional(),
    sitemap: z.enum(['skip', 'include', 'only']).optional(),
    limit: z.number().optional(),
    allowExternalLinks: z.boolean().optional(),
    allowSubdomains: z.boolean().optional(),
    crawlEntireDomain: z.boolean().optional(),
    delay: z.number().optional(),
    maxConcurrency: z.number().optional(),
    ...(SAFE_MODE
      ? {}
      : {
          webhook: z
            .union([
              z.string(),
              z.object({
                url: z.string(),
                headers: z.record(z.string(), z.string()).optional(),
              }),
            ])
            .optional(),
        }),
    deduplicateSimilarURLs: z.boolean().optional(),
    ignoreQueryParameters: z.boolean().optional(),
    scrapeOptions: scrapeParamsSchema.omit({ url: true }).partial().optional(),
  }),

• src/index.ts:449-521 (registration)

  Registration of the firecrawl_crawl tool using server.addTool, including name, description, parameters schema, and execute handler.

  server.addTool({
    name: 'firecrawl_crawl',
    description: `
   Starts a crawl job on a website and extracts content from all pages.
   
   **Best for:** Extracting content from multiple related pages, when you need comprehensive coverage.
   **Not recommended for:** Extracting content from a single page (use scrape); when token limits are a concern (use map + batch_scrape); when you need fast results (crawling can be slow).
   **Warning:** Crawl responses can be very large and may exceed token limits. Limit the crawl depth and number of pages, or use map + batch_scrape for better control.
   **Common mistakes:** Setting limit or maxDiscoveryDepth too high (causes token overflow) or too low (causes missing pages); using crawl for a single page (use scrape instead). Using a /* wildcard is not recommended.
   **Prompt Example:** "Get all blog posts from the first two levels of example.com/blog."
   **Usage Example:**
   \`\`\`json
   {
     "name": "firecrawl_crawl",
     "arguments": {
       "url": "https://example.com/blog/*",
       "maxDiscoveryDepth": 5,
       "limit": 20,
       "allowExternalLinks": false,
       "deduplicateSimilarURLs": true,
       "sitemap": "include"
     }
   }
   \`\`\`
   **Returns:** Operation ID for status checking; use firecrawl_check_crawl_status to check progress.
   ${
     SAFE_MODE
       ? '**Safe Mode:** Read-only crawling. Webhooks and interactive actions are disabled for security.'
       : ''
   }
   `,
    parameters: z.object({
      url: z.string(),
      prompt: z.string().optional(),
      excludePaths: z.array(z.string()).optional(),
      includePaths: z.array(z.string()).optional(),
      maxDiscoveryDepth: z.number().optional(),
      sitemap: z.enum(['skip', 'include', 'only']).optional(),
      limit: z.number().optional(),
      allowExternalLinks: z.boolean().optional(),
      allowSubdomains: z.boolean().optional(),
      crawlEntireDomain: z.boolean().optional(),
      delay: z.number().optional(),
      maxConcurrency: z.number().optional(),
      ...(SAFE_MODE
        ? {}
        : {
            webhook: z
              .union([
                z.string(),
                z.object({
                  url: z.string(),
                  headers: z.record(z.string(), z.string()).optional(),
                }),
              ])
              .optional(),
          }),
      deduplicateSimilarURLs: z.boolean().optional(),
      ignoreQueryParameters: z.boolean().optional(),
      scrapeOptions: scrapeParamsSchema.omit({ url: true }).partial().optional(),
    }),
    execute: async (args, { session, log }) => {
      const { url, ...options } = args as Record<string, unknown>;
      const client = getClient(session);
      const cleaned = removeEmptyTopLevel(options as Record<string, unknown>);
      log.info('Starting crawl', { url: String(url) });
      const res = await client.crawl(String(url), {
        ...(cleaned as any),
        origin: ORIGIN,
      });
      return asText(res);
    },
  });