The format was proposed in September 2024: a Markdown file at /llms.txt with a summary of the site and links to its main pages, and an optional /llms-full.txt with the full text of those pages. The idea is to spare an assistant the work of crawling a whole site to understand it.
No major assistant has announced that it reads the file, and Google has said its search systems do not use it. It costs little to publish and does no harm, as long as the real pages stay readable by crawlers. SeoGeoMap serves both files; the pages themselves, with clear text and structured data, remain what gets cited.