llms.txt
llms.txt is a plain Markdown file at a site's root, /llms.txt, that tells AI tools what the site is and links to its most useful pages with a line about each.
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What it is
Search engines read sitemaps; AI agents often prefer a short, human-written summary. llms.txt gives them one: the site's name, a paragraph on what it offers, then sections of links. Some sites add llms-full.txt with the full text of their pages.
It is a convention rather than a standard, and costs little to keep up to date. The links should point at pages that answer real questions, such as pricing, setup and support, rather than every page on the site.
In Xodia
Xodia's agent readiness skill has your AI write an llms.txt for your site, offer plain-text or Markdown versions of pages, and give non-browser clients a helpful 404.
xodia.ai does the same: its llms.txt is generated from the site's pages on every build, and links each page's Markdown version.
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Related terms
- Markdown twinA Markdown twin is a plain Markdown version of a web page served alongside the HTML, so AI agents and tools can read the page's content without its layout and scripts.
- Custom codeCustom code is HTML, usually a script or meta tag, added to every page of a site (or one page) for things like analytics, chat widgets, fonts or site verification.
- Structured dataStructured data is machine-readable information about a page, usually JSON-LD in the schema.org vocabulary, that tells search engines and AI tools what the page is about.