llms.txt is a simple, emerging convention: a plain-text file at your site root that points AI crawlers and answer engines to your most authoritative, citable content. Think of it as a curated map for large language models — low-effort to ship and a small but sensible signal as AI search grows.
llms.txt vs robots.txt
They solve different problems. robots.txt controls which crawlers may access which paths — it's about permission. llms.txt is about guidance: it highlights the pages you most want AI engines to read and cite. One gates access; the other curates attention.
Why it matters for GEO
Generative Engine Optimization is about being cited inside AI answers. An llms.txt file makes it easier for AI systems to find your strongest content quickly. It won't force a citation, but combined with extractable, authoritative pages it removes friction.
A common, costly mistake
Far more important than shipping llms.txt is making sure your robots.txt doesn't accidentally block the AI crawlers you want — GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and others. Many sites silently exclude themselves from AI answers this way. Audit your robots rules first.
How to build one
List your core pages and best content as markdown links with short descriptions. We generate ours dynamically so it stays current as new content publishes — you can see it at /llms.txt.
Where this fits
Shipping llms.txt and keeping AI crawlers unblocked is standard in our SEO, AEO & GEO service. Want to be cited by AI? Start with a free audit.
FAQs
Is llms.txt official or required? It's an emerging convention, not an official standard, and not required. It's low-effort and sensible as AI search grows, but the bigger lever is unblocked crawling plus genuinely citable content.
Will llms.txt guarantee AI citations? No — it removes friction but doesn't force citation. Citation depends on extractable structure, authority, and crawl access together.
Should robots.txt block AI bots? Only if you genuinely don't want AI visibility. Most businesses want the opposite — check you're not blocking GPTBot, ClaudeBot, or Google-Extended by accident.