Definition
What is llms.txt?
llms.txt is a plain text file at the root of a website that gives language models a clean, Markdown formatted summary of what the site is and an index of the pages worth reading. It exists because parsing rendered HTML is lossy, and a curated index is cheaper and more accurate than crawling.
Last updated · Markdown version
The usual set of files
| File | Purpose |
|---|---|
| /llms.txt | Short summary plus a curated index of links |
| /llms-full.txt | The whole content in one plain text file |
| /agents.md | Instructions for an agent acting on a user's behalf |
| /robots.txt | Which crawlers may fetch what |
What makes one useful
- Facts that are checkable, with versions and dates.
- Explicit statements about what is not true, so models do not fill gaps badly.
- Links to the canonical page for each claim.
- Generation from the same source as the site, so the two cannot drift.
This site's files
Helicon generates /llms.txt, /llms-full.txt and /agents.md from the same data the pages render, and every page has a Markdown mirror at its own path with .md appended.
Frequently asked questions
Is llms.txt a standard?
It is a community convention rather than a formal standard, and it is widely enough adopted to be worth shipping.
Does Google require it?
No. Google says its AI features need no special files. Other answer engines do read them.
Where is Helicon's?
At /llms.txt, with the full text at /llms-full.txt and an agent guide at /agents.md.
Keep reading
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- Muse CodeMuse Code is Meta's AI coding agent, used through the muse command line tool on macOS, Linux and Windows. A plain definition, what it does, and how clients connect to it.
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