A growing number of sites now publish an llms.txt file — a short, machine-readable overview placed at yourdomain.com/llms.txt. It tells AI agents, in plain text, who you are, what you offer, and which pages matter most.
Why it caught on
AI agents have to infer a lot from messy HTML. An llms.txt file removes that guesswork at exactly the moment an agent is deciding whether it understands your business. It is cheap to add, hard to get wrong, and increasingly expected by the tools that build answers from the open web.
What to put in it
Keep it short and factual: a one-paragraph description of your business, your key pages with a sentence each, and any guidance on how your content may be used. Think of it as a briefing for machines — the companion to robots.txt, which controls access while llms.txt adds meaning.
What this means for you
If you want to be found and represented accurately by AI, an llms.txt file is one of the highest-leverage, lowest-effort steps you can take. It is a small file with an outsized effect on how clearly AI systems can describe you.
Source: llms.txt proposal