llms.txt is a short Markdown file at the root of your site that tells AI assistants what you do and which pages matter. Check whether you have one and whether it follows the format.
Free, no sign-up. We fetch public pages only and store nothing.
When an assistant looks at your site it has limited room to read. llms.txt hands it a short list of your most useful pages with a line on each, instead of leaving it to guess from menus and footers.
The format is simple, but a missing title, relative links, or a file that is really your homepage in disguise (a common catch-all behaviour) make it useless. This check catches all three.
A proposed standard (llmstxt.org) for a Markdown file at /llms.txt. It starts with your site's name as an H1 and a one-line summary in a blockquote, followed by sections of links to your key pages, each with a short note.
Support varies. AI coding and documentation tools use it widely, and some assistants read it when they visit a site, but Google has said it does not use llms.txt for Search. Treat it as a cheap way to make your site easier for AI tools to understand, not as a ranking factor.
llms.txt is the table of contents: links with one-line notes. llms-full.txt, where a site offers one, holds the full text of those pages in a single file so a tool can read everything in one request.
Your services or products, pricing, key guides and FAQs, and contact and location details: the pages you would want an assistant to quote. Leave out logins, carts and thin pages.
No. robots.txt controls access and a sitemap lists every page for crawlers. llms.txt is a short, curated guide for AI tools. Most sites should have all three.