AI Communication Standards Glossary
llms.txt
A plain-text file placed at a website's root that gives AI language models a concise, human-readable overview of what the site is and what it contains.
Also known as: llms text file
llms.txt is a plain-text file placed at the root of a website (accessible at /llms.txt) that provides AI language models with a concise summary of the site's purpose, topics, key pages, and content structure. It is an emerging convention, inspired by robots.txt, designed to give AI systems a reliable starting point for understanding a website without requiring them to crawl every page. The format typically uses Markdown conventions for readability. Unlike llm.json, which is structured for machine parsing, llms.txt is written to be readable both by humans and by LLMs processing it as natural language context.