What Is llms.txt, and Is It Worth Adding?
August 22, 2026
llms.txt is a plain-text file at the root of a site, proposed as a way to give language models a clean, structured summary of what the site offers — the way robots.txt gives crawlers instructions.
It is worth understanding what is proposal and what is established, because a lot of writing about it blurs the two.
What it actually is
A markdown file at /llms.txt containing a short description of the site, its key pages, and any facts you would want quoted accurately. It is human-readable by design.
It is a **community proposal**, not a web standard. No major AI company has publicly committed to reading it, and there is no reliable public data showing it changes how a model answers. Anyone telling you otherwise is guessing confidently.
Why add one anyway
- It costs an hour and one file, and nothing about it can hurt you.
- It forces clarity. Writing your own pricing, limits and positioning in plain sentences is a useful exercise whether or not a model ever reads it.
- It is quotable. If anything does read it, the phrasing quoted is yours rather than reconstructed from marketing copy.
- It states what you are NOT. That is the part most likely to be got wrong about you, and the part no landing page ever says.
What to put in it
A one-paragraph description, what the product does in bullet form, real pricing, links to the pages that matter, and direct answers to the questions you are actually asked.
Include your limitations. A file saying "we do not have SSO, and buyers who need it should look elsewhere" is more useful to a model — and more credible — than one listing only strengths.
What not to expect
It is not a ranking factor, it will not get you cited, and it does not replace having pages worth quoting. Treat it as free insurance on accuracy rather than a growth channel.
If you have an hour and no llms.txt, write one. If you have an hour and thin content, write content instead.
Frequently asked questions
- What is llms.txt?
- A plain markdown file at the root of a site giving language models a structured summary of what it offers -- description, key pages, pricing and facts you want quoted accurately. It is a community proposal rather than a web standard.
- Does llms.txt actually work?
- No major AI company has publicly committed to reading it, and there is no reliable public data showing it changes model answers. It costs about an hour, cannot hurt, and forces useful clarity -- but it is insurance on accuracy, not a growth channel.
- What should an llms.txt file contain?
- A one-paragraph description, what the product does, real pricing, links to key pages, and direct answers to common questions. Include your limitations -- what you do not offer is the part most likely to be got wrong about you.
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