llms.txt
A proposed plain-text file that points AI crawlers to your most important content in Markdown.
The llms.txt convention is a simple file at your domain root that lists key pages, often with Markdown versions that are easy for models to read. Adoption is inconsistent and its impact is debated.
The honest read is that the downside is low and the upside is uncertain. It is cheap to add, so most sites may as well, while keeping expectations modest.