llms.txt in Jekyll

Where the file goes

Jekyll copies any file that does not start with an underscore or dot, and that has no YAML front matter, straight into the built _site directory, preserving its path. A file named llms.txt in the project root is served at /llms.txt.

Method: static file in the root

1. Create the file at the repo root: touch llms.txt
2. Write your content with no front matter (front matter would make Jekyll try to render it):

# Your Site Name

> One-sentence description of your site for LLM context.

## Core pages

- [Home](https://yourdomain.com/): what this site is about.
- [Blog](https://yourdomain.com/blog/): articles and updates.
- [About](https://yourdomain.com/about/): who maintains this site.

3. Build and deploy: bundle exec jekyll build.

Underscore and dot files

Jekyll ignores files and folders beginning with _ or . by default. This does not affect llms.txt, but if you ever need such a file you must add it to the include list in _config.yml:

# _config.yml
include:
  - _example.txt

Verifying the setup

curl -sI https://yourdomain.com/llms.txt | grep -i content-type
# expect: content-type: text/plain

Many Jekyll sites are hosted on GitHub Pages, which serves the file from the domain root. See the GitHub Pages guide for that setup, and the format guide to get the content right.