llms.txt: What It Is and Whether It Helps Your Website

llms.txt is a text file that proposes summarizing your site for AI models, and for Google Search it does nothing: Google's documentation says Google Search doesn't use it and that creating one neither helps nor harms your visibility. If you run a local business and want to be found on Google and in AI assistants, your time is better spent elsewhere. Here is what it is, what is known and what to do instead.

What llms.txt is

It was proposed by Jeremy Howard, who published it on llmstxt.org in September 2024. It is a Markdown file (plain text with simple markers) placed on your site under the name llms.txt. The proposal spells out what it should contain: the site's name as a title, a short summary in a quote block, and lists of links to the important pages, each with a short note.

The idea is to give an AI agent a concise guide in one place, so it doesn't have to work through all the code of your pages. On paper that makes sense. The catch is what the proposal leaves out: it doesn't name a single AI system that reads the file. It is an open proposal for a format, not a standard from a standards body and not a rule Google has adopted.

What Google says

Google has a guide to optimizing for generative AI search, which covers AI Overviews and AI Mode (the version I read was last updated on July 10, 2026). In its section on things you can ignore, it says you don't need to create new machine-readable files, AI text files, markup or Markdown to appear in Google Search, because Google Search itself doesn't use them. It adds that creating them will neither harm nor help your visibility or rankings in Google Search, because Google Search ignores them.

That fits another Google page on those features: there are no additional requirements to appear in AI Overviews or AI Mode, no special optimizations, and no special schema.org structured data to add.

In June 2025, Google's John Mueller wrote on Bluesky that no AI system currently uses llms.txt, and that chatbots fetch your pages but none of them fetch that file, as reported by Search Engine Roundtable. That is one Google employee's word, more than a year old. Treat it as context, not as a verdict.

One detail that causes confusion: Lighthouse, Chrome's auditing tool, has an llms.txt check in its agentic browsing category. Its documentation says a missing file is not flagged as a failure: if the file doesn't exist, the check shows as "Not applicable", because providing it is optional at the moment. It only warns you if the server returns an error when the file is requested.

When it might make sense

There is one case where a file like this is reasonable: technical documentation. If your site is a product manual or API documentation that developers consult through coding assistants, a clean index can save an agent some work. That is where the proposal comes from, and according to it, some AI labs publish one for their own developer documentation.

A medical office, a construction company or a restaurant is not in that case. If you already have the file, or your platform generates it, nothing is wrong: Google says it's fine to keep it. What isn't worth doing is paying for it as if it were the key to AI.

If you want to create one anyway

It is a file of a few lines and costs almost nothing. The proposal asks for a specific order, and you can follow it without being technical:

• A title with your business name.
• A summary of two or three lines: what you do, for whom and in which city.
• Sections with links to your important pages (services, contact, location), each link with a short note.
• A separate section called Optional for secondary material, which an agent can skip when it needs to move faster.

If you do it, treat it as an extra, not an investment. Check that it doesn't contradict what your page says and that your contact details match. An outdated file that says one thing while your site says another only adds confusion.

What does matter for being found

Google's same guide says where to put the effort. These things are unglamorous, but they are the ones that count:

• Content that is yours and useful. Google asks for content built on what you know about the topic, not a rehash of what others have already said.
• Content that can be crawled. Crawling means a search engine can visit your pages. Google's page on AI features lists making sure crawling is allowed in robots.txt, the file that tells search engines which parts of your site they may visit, and also by any CDN or hosting infrastructure.
• A good page experience. It should load fast and read well on a phone.
• Complete business details. Google says a Google Business Profile helps your products and services be visible in AI responses as well as in other Google Search results.
• Structured data, without obsessing. The guide says it isn't required for generative AI search and that no special schema.org markup is needed, but it still recommends using it as part of your regular SEO.

A check you can do today with no technical help: type your domain followed by /robots.txt in the browser and read what appears. If you see a line blocking the whole site for all search engines, you have found a problem far more serious than the absence of any trendy file. If you don't understand what it says, send it to whoever manages your site and ask what it allows and what it blocks.

Then search for your business name on Google and compare what shows up with what your page says: hours, phone number, address. Search engines and AI assistants rely on what they find; if they find three different versions, some of them will be wrong.

For AI assistants other than Google there is no official recipe. That is why it pays to bet on what works everywhere: a site that can be read and crawled, that you haven't blocked by accident, and whose details say the same thing in every place.

And to measure, Search Console includes traffic from AI Overviews and AI Mode in the regular Performance report, under the Web search type. There is no separate dashboard to buy.

In short

• llms.txt is a format proposal; Google Search doesn't use it and says so in its documentation.
• Having one neither helps nor harms your visibility on Google. If you already have one, you can leave it.
• It makes more sense for technical documentation than for a local business site.
• Effort pays off more in your own content, crawlability, page experience and business details.