AI search. Reviewed October 29, 2026
llms.txt
Also called: LLMs text file
llms.txt is a plain text file at the root of a website, like robots.txt, that gives AI crawlers a summary of the business and a list of its important pages with one-line descriptions.
In practice
A companion file, llms-full.txt, can carry the full text of every page so an assistant can read the whole site in one request. This site generates both at every build, so prices and pages never drift from what visitors see.
It is a proposed convention, not a standard every assistant honors. It costs nothing to publish and it removes a reason to be misread.
Related terms
- AI crawlerAn AI crawler is a bot such as GPTBot, ClaudeBot or PerplexityBot that reads web pages so an AI assistant can learn from them or quote them, and a site allows or blocks each one in its robots.txt file.
- Generative engine optimizationGenerative engine optimization is the work of getting a business named or cited in answers written by AI assistants, through clear facts on its own site, structured data, and mentions on sites the assistants trust.
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