Think robots.txt, but for meaning rather than permission. Robots.txt tells a crawler what it may read. llms.txt tries to tell it what to understand, which is a much harder thing to ask of a text file.
The honest status.
It is a proposed convention, not a standard. No AI engine has committed to reading it, and anyone who tells you llms.txt is why a brand shows up in ChatGPT is guessing. What actually drives AI recommendations, as far as anyone can measure, is how often and how consistently your brand is described across the web.
So why ship one? Because it takes twenty minutes, it cannot hurt, and writing it forces a useful exercise: saying what your business does in one paragraph a machine could repeat back. Most businesses cannot do that on request. I have had clients find their positioning while writing theirs, which was not the point of the exercise.
What goes in it.
- One paragraph on who you are and what you sell, in the words a customer would use.
- The named terms your business uses, each defined in a line. If you have invented language, this is where you teach it.
- The pages that matter, each with a line on what it covers. Not your whole sitemap.
- How to get in touch, and the one action you want someone to take.
- Nothing you would not say on the page itself. Your name, address and phone number match the page copy and the schema character for character.
The part that actually matters.
Answer engines are the 2026 problem. An AI overview sits above the results and takes the click you used to get. The question stops being where you rank and becomes whether you are the thing being quoted.
An assistant reaches for names it keeps seeing described the same way in a lot of places. That comes from structured data on every page, an FAQ written in real questions, publishing regularly, and mentions on sites that are not yours.
llms.txt is the cheapest item on that list and the least powerful. Do it because it is cheap, not because it is the lever.
Ours is at www.5fourdigital.com/llms.txt, and it is section 7 of the 5Four Launch Checklist, alongside explicitly allowing the AI crawlers in robots.txt.
Related: llms.txt in the glossary, Answer Engine Optimization, the Site System.
Designer, developer and educator in Miami. I run strategy and creative direction at 5Four Digital, a web design and development agency that leans on AI. I have spoken at AIGA, Adobe MAX and Webflow Conf, and I put the whole process on YouTube.
