Your robots.txt blocks all user-agents from the entire site, so no AI engine can index you. Scope the Disallow rules to private paths only.
robots.txt blocks OpenAI GPTBot, Perplexity, Claude (Anthropic), Google Gemini / AI, Common Crawl (feeds many LLMs). These are primary sources for AI answers — allow them to crawl.
The emerging llms.txt standard gives AI assistants a clean, curated summary of your site. Add one at /llms.txt.
A sitemap.xml helps every crawler discover all your pages. Generate one and reference it in robots.txt.