# AI readiness of booking.com > Measured on the home page. Overall grade: Poor. Score 37/100, grade Poor. Measured 2026-09-04T15:06:26.912+00:00, engine ax-audit@3.6.0. ## Checks ### LLMs.txt — 60/100 - **PASS** /llms.txt exists - **WARN** /llms.txt Content-Type is "text/html" Expected one of: text/plain, text/markdown Configure your server to serve /llms.txt as text/plain so AI agents parse it correctly. https://lucioduran.com/projects/ax-audit/guides/llms-txt#wrong-content-type - **WARN** Missing H1 heading (first line should start with "# ") Add an H1 heading as the first line of your llms.txt file, e.g.: # Your Site Name https://lucioduran.com/projects/ax-audit/guides/llms-txt#missing-h1 - **WARN** No blockquote description found ("> ...") Add a blockquote description after the H1 heading, e.g.: > A brief summary of your site for AI agents. https://lucioduran.com/projects/ax-audit/guides/llms-txt#missing-blockquote - **WARN** No section headings found (## ...) Organize your llms.txt content with ## section headings (e.g., ## About, ## API, ## Documentation). https://lucioduran.com/projects/ax-audit/guides/llms-txt#missing-sections - **WARN** No Markdown links found Add Markdown links to relevant pages: [Page Title](https://example.com/page). This helps AI agents navigate your site. https://lucioduran.com/projects/ax-audit/guides/llms-txt#no-links - **PASS** /llms-full.txt also available (bonus) ### Robots.txt — 55/100 - **PASS** /robots.txt exists - **FAIL** No core AI crawlers explicitly configured Expected: GPTBot, ClaudeBot, ChatGPT-User, Claude-SearchBot, Google-Extended, PerplexityBot, OAI-SearchBot, CCBot Add User-agent entries for core AI crawlers in your robots.txt. For each crawler, add: User-agent: followed by Allow: / on the next line. https://lucioduran.com/projects/ax-audit/guides/robots-txt#no-core-crawlers - **WARN** No Sitemap directive found Add a Sitemap directive to your robots.txt: Sitemap: https://your-site.com/sitemap.xml https://lucioduran.com/projects/ax-audit/guides/robots-txt#missing-sitemap - **WARN** No Content-Signal directive found (optional) Declare how crawlers may use your content after access with the Content Signals Policy, e.g.: Content-Signal: search=yes, ai-train=no. Known signals: search, ai-input, ai-train. Generate yours at contentsignals.org. https://lucioduran.com/projects/ax-audit/guides/robots-txt#missing-content-signals - **WARN** 0/48 known AI crawlers have explicit rules Add explicit User-agent entries for more AI crawlers to maximize discoverability. https://lucioduran.com/projects/ax-audit/guides/robots-txt#low-coverage ### Agent Card (A2A) — 0/100 - **FAIL** /.well-known/agent.json not found HTTP 404 Create a /.well-known/agent.json file following the A2A (Agent-to-Agent) protocol. It should include name, description, url, and skills fields describing your site's capabilities. https://lucioduran.com/projects/ax-audit/guides/agent-json#not-found ### Security.txt — 80/100 - **PASS** /.well-known/security.txt exists - **PASS** Required field "Contact" present - **PASS** Required field "Expires" present - **FAIL** Expires date is in the past — security.txt is expired Update the Expires field to a future date. RFC 9116 requires security.txt to have a valid, non-expired date. https://lucioduran.com/projects/ax-audit/guides/security-txt#expired - **PASS** 1/5 optional fields present ### Meta Tags — 36/100 - **WARN** No AI meta tags (ai:*) found Add AI meta tags to your HTML : , , . https://lucioduran.com/projects/ax-audit/guides/meta-tags#no-ai-meta - **WARN** No rel="alternate" link to llms.txt in HTML Add to your : https://lucioduran.com/projects/ax-audit/guides/meta-tags#no-llms-alternate - **WARN** No rel="alternate" link to agent.json in HTML Add to your : https://lucioduran.com/projects/ax-audit/guides/meta-tags#no-agent-alternate - **WARN** No rel="me" identity links found Add rel="me" links to verify your identity across platforms: , . https://lucioduran.com/projects/ax-audit/guides/meta-tags#no-rel-me - **WARN** No OpenGraph meta tags found Add at minimum og:title, og:description, og:url, og:type, and og:image. Agents and link previews depend on these. https://lucioduran.com/projects/ax-audit/guides/meta-tags#no-opengraph - **WARN** No Twitter Card meta tags found Add twitter:card, twitter:title, twitter:description, and twitter:image so X / Threads / Bluesky / Discord agents render link previews correctly. https://lucioduran.com/projects/ax-audit/guides/meta-tags#no-twitter ### OpenAPI Spec — 0/100 - **FAIL** /.well-known/openapi.json not found HTTP 404 Create a /.well-known/openapi.json file with your API specification following the OpenAPI 3.x standard. See https://swagger.io/specification/ for the spec. https://lucioduran.com/projects/ax-audit/guides/openapi#not-found ### MCP (Model Context Protocol) — 0/100 - **FAIL** /.well-known/mcp.json not found HTTP 404 Create a /.well-known/mcp.json file describing your MCP server configuration. Include name, description, tools, and version fields. See https://modelcontextprotocol.io for the spec. https://lucioduran.com/projects/ax-audit/guides/mcp#not-found ### Sitemap — 20/100 - **PASS** Sitemap located: https://booking.com/sitemap.xml - **FAIL** Sitemap response does not look like XML and contains or . https://lucioduran.com/projects/ax-audit/guides/sitemap#not-xml ### TLS / HTTPS — 100/100 - **PASS** Site is served over HTTPS - **PASS** HTTP requests redirect to HTTPS - **PASS** HSTS max-age=63072000 - **PASS** HSTS includes subdomains - **PASS** HSTS preload-eligible ### AI Well-Known — 0/100 - **WARN** 0/5 emerging AI discovery files published - **WARN** ai.txt not found Tried: /.well-known/ai.txt Publish /.well-known/ai.txt declaring opt-in/opt-out signals for AI training. See https://site.spawning.ai/spawning-ai-txt for the format. https://lucioduran.com/projects/ax-audit/guides/well-known-ai#ai-txt - **WARN** genai.txt not found Tried: /.well-known/genai.txt Publish /.well-known/genai.txt declaring your generative-AI usage policy. https://lucioduran.com/projects/ax-audit/guides/well-known-ai#genai-txt - **WARN** ai-plugin.json present at /ai-plugin.json but does not look valid Publish /ai-plugin.json (legacy ChatGPT plugin manifest). Schema: name_for_model, description_for_model, api.url. Still consumed by some agents. https://lucioduran.com/projects/ax-audit/guides/well-known-ai#ai-plugin-invalid - **WARN** agents.json present at /agents.json but does not look valid Publish /agents.json describing your site as a callable agent (OpenAgents / Wildcard emerging spec). Includes name, description, and operations[]. https://lucioduran.com/projects/ax-audit/guides/well-known-ai#agents-json-invalid - **WARN** nlweb.json present at /nlweb.json but does not look valid Publish /.well-known/nlweb.json (Microsoft NLWeb) so agents can interact with the site through a natural-language interface. https://lucioduran.com/projects/ax-audit/guides/well-known-ai#nlweb-invalid ### Content Negotiation — 0/100 (reports, does not score) - **FAIL** Homepage does not serve Markdown via content negotiation Got text/html (HTTP 202) for "Accept: text/markdown" Serve a Markdown representation of your pages when agents request "Accept: text/markdown". Agents like Claude Code and Cursor ask for it, and Markdown cuts token usage by ~80% vs HTML. Cloudflare ("Markdown for Agents") and Vercel can enable this without code changes. https://lucioduran.com/projects/ax-audit/guides/content-negotiation#not-supported - **WARN** No fallback found on the homepage If you cannot enable content negotiation, advertise a Markdown version with so agents can discover it. https://lucioduran.com/projects/ax-audit/guides/content-negotiation#no-alternate ### RSL License — 0/100 (reports, does not score) - **FAIL** No RSL license discovery found Checked robots.txt License directive, Link header, and Declare machine-readable licensing terms for your content with Really Simple Licensing. Add to robots.txt: License: https://your-site.com/license.xml — then publish the RSL document. See https://rslstandard.org. https://lucioduran.com/projects/ax-audit/guides/rsl#not-found ### Agent Access — 100/100 (reports, does not score) - **PASS** All 8 core AI crawler user-agents receive equivalent responses ### Structured Data — 0/100 - **FAIL** No JSON-LD structured data found Add a