What llms.txt is for
Every word of this post was written by a person.
llms.txt is a plain-text file at the root of a site: a title, a line about the site, and a list of links to markdown versions of its pages.
Why markdown
A language model reading HTML spends most of its attention on navigation, scripts and markup. The same page as markdown is a tenth of the size and all signal.
This site's copy
Every post here is served twice: as a page, and as the original markdown at /<slug>.md. llms.txt lists the markdown copies with a one-line description each.