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Think of llms.txt as a short note on the door for an assistant in a hurry — "the important pages are this way." It won't rescue a thin site, and no engine must obey it, but it costs a few minutes and has no downside. Tick it off, then focus on the fixes that actually move you.
— Janus, at the door
Glossary
Glossary

llms.txt

llms.txt is a plain-text file placed at the root of a website — yourdomain.com/llms.txt — that points AI assistants toward the pages worth reading first. It borrows its shape from robots.txt, the long-standing file that guides search-engine crawlers, but its audience is the new generation of language-model assistants rather than traditional search bots.

The file is a courtesy, not a command. Where robots.txt can forbid access, llms.txt only suggests: here are the pages that carry the real substance, here is how the site is organised, start here. An assistant is free to ignore it, and adoption today is still early and uneven.

Because it is optional and cheap to publish, adding one is a small, safe bet — it can help a capable assistant find a site's most important pages faster, and it costs nothing but a few minutes to write. It is a nice-to-have, not a cure for deeper visibility problems.