llms.txt and schema markup: what they do for AI visibility, and what they don’t

Two technical terms come up in almost every conversation about AI search: schema markup and llms.txt. Your web developer may already have set both up. Here is what they actually do, so you can judge how much they matter.

Schema markup: labels search engines understand

Schema markup is a small block of structured data in a page’s code that describes the page in a standard vocabulary (schema.org). It tells search engines, without guessing, that this page is an article written on a certain date, that this one is a product with a price, or that this business is located in Al Quoz and opens at 9am.

• What it does: helps Google understand and display your pages, and can make them eligible for rich results such as review stars, FAQs and product details.
• What it does not do: it does not rank a weak page on its own. It makes good content easier to understand; it does not replace it.
• The common gap: many sites only have a single “Organization” block on the homepage. Each article, product and FAQ page should describe itself too.

llms.txt: a summary file for AI tools

llms.txt is a proposed standard from 2024: a plain-text file at the root of your website (yoursite.com/llms.txt) that summarises what the site is and links to its most important pages in a format that is easy for language models to read. llms-full.txt goes further and includes the full text of those pages in one file.

• What it does: gives AI tools and agents a clean, compact overview of your business and content.
• What it does not do: none of the major AI assistants has publicly confirmed that it uses llms.txt when deciding what to cite. Treat it as cheap, sensible housekeeping, not a ranking lever.
• The common gap: the file is created once and never updated, so new articles and products are missing from it.

What to check on your own site

1. Run a few of your pages through Google’s Rich Results Test and see which structured data it finds.
2. Check that every article has Article schema with a real date, and that FAQ sections are marked up as FAQs.
3. Open yoursite.com/llms.txt. If it exists, check that it describes your business accurately and lists your newest pages.
4. Confirm your sitemap is submitted in both Google Search Console and Bing Webmaster Tools.

How we handle it

If your developer already set these up, we do not redo them. We audit what is there, fill the gaps, and keep llms-full.txt and your schema current every time we publish a new article for you. It is a small part of the monthly work; the bigger part is the content itself. Read more in SEO vs AEO vs GEO.