Insights · 4 min read
Do you need llms.txt? (Google ignores it — here's who doesn't)
Only for the non-Google engines. Google says plainly that it doesn't use llms.txt and that the file will "neither harm nor help" your visibility on Google Search. But ChatGPT, Claude, Perplexity and autonomous agents can read it, so it's a low-cost, genuine benefit — just not the one it's usually sold as.
Written by James Selby, AI consultant, ThirtyThirty · Last updated 26 July 2026
What is llms.txt?
llms.txt is a simple, proposed standard: a plain-text file at your site root that gives AI models a clean, curated summary of what your site is, who it's for, and where the important pages are. Think of it as a friendly briefing document for a machine that would otherwise have to guess from your HTML.
Why Google's position matters
It's tempting to treat llms.txt as an AI-search silver bullet. Google closes that door directly: "Google Search itself doesn't use them" and they "will neither harm nor help your site's visibility." So if a provider tells you an llms.txt file will get you into Google's AI Overviews, they're either mistaken or hoping you won't check. Being straight about this is exactly the kind of honesty that separates a real AEO practitioner from a hype merchant.
So why ship one at all?
Because the rest of the AI world isn't Google. The non-Google answer engines and the growing population of autonomous agents that browse and buy on people's behalf can and do read llms.txt. A clean file that states your services, pricing and key pages makes you easier for those systems to represent accurately. It's ten minutes of work for a real, if modest, upside — provided you don't pretend it's doing something it isn't.
Frequently asked questions
Will llms.txt help me rank in Google's AI Overviews?
No. Google says it doesn't use llms.txt and that the file neither helps nor harms your Google visibility. Ship it for the non-Google engines and agents, not for Google.
Is there any downside to having one?
Practically none — Google says it won't harm your visibility, and it can help other AI systems represent you accurately. The only real risk is being misled into thinking it's a Google tactic. Keep it accurate and up to date.