What Is llms.txt, and Does a Local Business Need One?

If you have been reading about AI search you have probably run into llms.txt, usually described as essential and usually without anybody explaining what it is.

Here is the plain version, including the part most articles leave out.

What it actually is

It is a text file that sits at the root of your website, at yourbusiness.ca/llms.txt, in the same way robots.txt has for decades.

Inside is a summary of your site written for a machine rather than a person. A short description of what your business is, then a tidy list of your important pages with a line explaining each one. No design, no navigation, no cookie banner. Just the facts about what you offer and where to find them.

The idea behind it is reasonable. A modern website is mostly wrapper. Menus, scripts, banners, footers. A system trying to understand your business has to wade through all of it to find the substance. An llms.txt file hands over a clean summary instead of making it guess.

It was proposed in late 2024 and it spread quickly, partly because it is easy to write about and easy to sell.

The part most articles skip

Nobody has confirmed they read it, and Google has said flatly that it does not.

That is not a hedge, it is the documented position. Gary Illyes said at Google Search Central Live in July 2025 that Google does not support llms.txt and has no plans to. Google's own AI optimization guidance, updated in June 2026, puts it in writing: you do not need to create machine readable files, AI text files or Markdown to appear in Google Search, including its generative features, because Search does not use them.

John Mueller added the detail that settles it. Asked whether any AI service uses these files, he pointed out that you can tell from your own server logs that they do not even check for it. The file is not being ignored after being read. It is not being requested.

He also drew a comparison worth remembering: the old keywords meta tag, which Google abandoned precisely because anybody could type anything into it. A file where a business describes itself, unverified, has the same weakness built in.

I would rather tell you that than sell you a file. A lot of the content promoting llms.txt implies an established standard that AI systems consult. As of August 2026 that is not the state of things. It is a sensible proposal that the major players have not adopted.

So the honest framing is a cheap lottery ticket, not a lever. It costs about an hour, it cannot harm you, and if adoption ever comes you are already there. If somebody is charging you real money for one, or putting it at the centre of an AI search package, push back hard.

The genuinely useful side effect

Here is why I still suggest doing it, and it has little to do with the file.

Writing one forces a question most owners have never sat down with: if you had to explain your business to something with no context, in one paragraph and a list of links, what would you say?

Almost everybody who tries this discovers gaps. Services they offer that have no page. Towns they serve that are mentioned nowhere. A pricing page that says nothing about price. The exercise is a free audit of whether your website actually communicates what your business does, and the answer is often no.

That clarity then improves your ordinary pages, which is the thing we know matters.

How to write one

Keep it short. A page or two of plain text, in Markdown.

Open with your business name as a heading, then a single paragraph saying what you do, who you do it for and where. Write it factually rather than persuasively. This is not the place for "your trusted partner in comfort." It is the place for "a family-run HVAC business in Brantford, Ontario, serving Brant County and Hamilton, specializing in furnace repair, air conditioning installation and annual maintenance."

Then list your important pages under a few headings, each with the link and a short line of what is there. Your services. How to get in touch or book. Your service areas.

Then a short notes section for anything true that no page states outright. Your service radius. What you do not do, which is genuinely useful. Whether you handle emergencies and what counts as one. The best way to reach you.

Save it as llms.txt and put it at the root of your site, alongside robots.txt. If your site is on a builder that does not allow root files, this is a good reason to ask why.

One rule that matters more than any of the above: every word of it has to be true and match your site. A file that claims services you do not offer, or a phone number that disagrees with your Google profile, is worse than no file at all. Inconsistency is the thing that costs you.

What to do instead if you only have one hour

If you have exactly one hour and you are choosing between writing an llms.txt file and something else, do not write the file.

Write the questions section on your website instead. Ten real questions customers ask you on the phone, answered plainly in your own words. That is read by search engines today, quoted by answer engines today and useful to a customer today. It is the highest-return hour available to most local businesses, and it is confirmed to matter rather than hoped to.

Do the llms.txt file in hour two.

Common questions

Does Google use llms.txt?

No. Gary Illyes confirmed at Google Search Central Live in July 2025 that Google does not support it and has no plans to, and Google's AI optimization guidance updated in June 2026 states that Search does not use machine readable files of this kind. Its systems read your ordinary pages and your structured data instead.

Does ChatGPT read llms.txt?

There is no confirmation from OpenAI that it does. John Mueller has noted that server logs show AI crawlers do not even request the file, which is stronger evidence than an absence of announcements. Treat it as a low-cost bet rather than an established practice.

Is llms.txt the same as robots.txt?

No. They sit in the same place and share a naming convention, but robots.txt tells crawlers which parts of your site they may access, and it is genuinely read and obeyed. An llms.txt file is a content summary intended to help a system understand your site, and its adoption is unconfirmed.

Is it worth paying an agency to create one?

Not as a standalone item of any real cost. It is an hour of writing. If it appears in a proposal as a significant line, ask what else is included and what evidence there is that it moves anything.

Will llms.txt hurt my SEO?

No. It is a separate file that ordinary search engines ignore. The only real risk is stating something that contradicts your website or your listings, so keep it accurate and update it when your services change.