Definition
llms.txt
llms.txt is a plain-text Markdown file at the root of your site (`/llms.txt`) that gives AI tools a concise, curated map of what your site is and where the important content lives, like a `robots.txt` for meaning rather than access.
Adoption is still early, so treat it as low-cost insurance rather than a guaranteed lever. Step-by-step with an example: how to write an llms.txt file.
Where does llms.txt go?
At the root of your domain, reachable at https://yoursite.com/llms.txt, the same location as robots.txt.