What is llms.txt?

llms.txt is a proposed web standard: a plain-markdown file at a site's root (/llms.txt) that gives AI systems a concise, structured orientation to the site — what the organization is, key facts, and links to its most important pages with one-line descriptions. It plays a role for LLMs similar to what robots.txt and sitemaps play for search crawlers.

In plain terms

llms.txt, explained.

Where robots.txt says what crawlers may access and sitemap.xml lists URLs, llms.txt explains — in language models' native format, markdown — what actually matters: the entity, its offerings and its canonical pages. It reduces the chance an AI system misunderstands or overlooks a site when composing answers.

It costs minutes to create and signals machine-readability across the board — which is why GEO practitioners treat it as baseline hygiene alongside schema markup and clean semantics. This site's own file is at gthree.agency/llms.txt.

Why it matters

A five-minute file that makes your site legible to every AI system that looks.
Pairs with schema markup to establish a consistent machine-readable identity.
Adoption is early — having one still differentiates.

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Common questions

Asked and answered.

Is llms.txt an official standard?

It's a community proposal with growing adoption rather than a ratified standard — but it's cheap, harmless and increasingly recognized, so the expected value is clearly positive.

What goes in an llms.txt file?

A one-paragraph summary of the organization, key facts, and grouped links to important pages, each with a one-line description — all in plain markdown.

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