Search assistants such as ChatGPT, Claude, Perplexity and Google’s AI answers read websites differently from a classic search crawler. These tools check the two things that decide whether they can use your site: an llms.txt file that gives them a clean index of your best pages, and a robots and firewall setup that actually lets their crawlers in. Generate and validate your llms.txt, then audit which AI crawlers are allowed, blocked or silently challenged on any domain.