llms-full.txt: what it is and when to publish one

The llms.txt proposal, published in 2024, suggests a Markdown file at /llms.txt that summarises a site and links to its most useful pages. llms-full.txt emerged as a companion: instead of links, it contains the content of those pages concatenated into one file.

The clearest use is developer documentation. Documentation platforms can generate llms-full.txt automatically, and developers paste the file or its URL into coding assistants and chat tools so the model answers from current docs rather than outdated training data. Some agent frameworks also fetch it when pointed at a site. Google representatives have said Google Search does not use llms.txt, and no major AI answer engine has announced that it uses either file to select sources.

Start with a title and one-paragraph summary, then include the content of the pages a user or agent would most need, each under its own heading with its canonical URL. For a SaaS product that usually means the product overview, pricing, documentation, integration guides, and policies. Leave out navigation, footers, and marketing fluff. Keep facts consistent with the live pages, since a stale file can feed outdated answers into whatever tool reads it.

serionflow.com publishes both files. A build script regenerates llms.txt and llms-full.txt from the same content registry that produces the public pages and sitemap, so the files cannot drift from the site, and pages held back from release are excluded from both. That build-time approach is the main thing we would recommend: hand-maintained llms-full.txt files go out of date quickly.

Yes, if you have developer documentation or an API that people use with AI coding tools. Probably not as a priority if you run a marketing site and want AI search citations; crawlable server-rendered pages, clear answers, and accurate third-party mentions matter far more. If you do publish one, generate it automatically and check that your robots.txt allows the agents you expect to read it. Our free llms.txt generator creates a starting llms.txt from your sitemap. SerionFlow is the wrong tool for generating llms-full.txt from documentation; a documentation platform or a build script is the right place for that file.