llms.txt: what it is and whether you need one
A practical look at the emerging standard for telling AI crawlers what matters on your site.
llms.txt is a simple text file you place at the root of your domain that points AI readers at your most important content, in clean Markdown, without the navigation and clutter of a full HTML page. Think of it as a curated table of contents written for machines.
What it looks like
At its simplest it's a Markdown file at https://yoursite.com/llms.txt with a short description of what your site is and a list of links to your key pages:
# Acme Analytics
> Product analytics for small teams.
## Core
- [What we do](https://acme.com/product): the one-paragraph overview.
- [Pricing](https://acme.com/pricing): plans and limits.
- [Docs](https://acme.com/docs): setup and API.
That's it. No new infrastructure, no build step — just a file.
Why it might help
AI crawlers spend a limited budget parsing your site. If your most important explanation of "what you are" is buried three clicks deep behind menus and JavaScript, it may never be read — a close cousin of why ChatGPT ignores most business websites. An llms.txt hands the engine a clean, prioritized path to the content you actually want cited.
Whether you need one
Be honest about the current state: support is uneven and it's a convention, not a mandate. So treat it as low cost, low risk, possible upside:
Worth doing if
- You have a handful of pages that best explain your value, and you want them front-of-line.
- Your site is JS-heavy and you worry key content is hard to fetch.
Not a priority if
- Your core content isn't yet readable or confirmable at all — fix that first. An
llms.txtpointing at unreadable pages helps no one.
How it fits the bigger picture
llms.txt is one small lever inside GEO. It won't rescue a site that AI engines can't read or confirm, but on a healthy site it's a cheap way to say "start here." Add it after the fundamentals — readability, structure, answer-shaped content — are in place, not before.
Frequently asked
It's an emerging convention, not a ratified standard, and support varies by engine. Treat it as a low-cost, low-risk signal — helpful where honored, harmless where ignored — not a magic switch.
No. robots.txt controls crawler access, the sitemap lists your URLs, and llms.txt points AI readers at your most important content in a clean form. They complement each other.