llms.txt is published
An llms.txt file at a well-known location is the agent equivalent of a sitemap. It tells AI ingesters what pages on your site are worth reading and gives them a single, deterministic starting point for crawling.
How the check decides
The check sends a GET request to /llms.txt, then to /.well-known/llms.txt, then to /docs/llms.txt. If any of those return a 2xx response it passes. If none do, it falls back to the same paths under llms-full.txt (the long-form variant). If still nothing answers, the check fails.
How to implement it
Create a plain-text file named llms.txt at the root of your site (or under /.well-known/) that lists the pages you want agents to read. Each line is either a markdown link, a section heading, or free text. The format is intentionally simple — agents can parse it without an HTML parser.
Pass
# Example Docs
## Getting started
- [Install](https://example.com/docs/install.md)
- [Quickstart](https://example.com/docs/quickstart.md)
## Reference
- [API](https://example.com/docs/api.md)
Served at https://example.com/llms.txt.
Fail
No file at any of the well-known paths — GET /llms.txt, GET /.well-known/llms.txt, GET /docs/llms.txt, and the llms-full.txt variants all return 404.