robots.txt blocks OpenAI GPTBot, Perplexity, Claude (Anthropic), Common Crawl (feeds many LLMs). These are primary sources for AI answers — allow them to crawl.
AI engines use schema.org markup to understand who you are. Add at least Organization and WebSite JSON-LD.
The emerging llms.txt standard gives AI assistants a clean, curated summary of your site. Add one at /llms.txt.
Answer-engine queries are questions. A clear FAQ (ideally with FAQPage schema) gives them ready-made answers to quote.