llms.txt is a plain Markdown file at the root of a website that summarises what the site is and links to its most useful pages, written for AI assistants to read.
It is a proposed convention, not a standard every assistant follows. The idea is to give a language model a short, clean overview instead of making it work through navigation, scripts and styling.
A common companion is llms-full.txt, which holds the site's full content in one file.
Why it matters for a launch
It costs almost nothing to publish and makes your site easier for assistants and agents to quote correctly. IndieLaunch publishes one at /llms.txt, listing every category and recent launch.
Read more: How to get recommended by ChatGPT