llms.txt doesn't affect whether you appear in AI answers today, as far as anyone can show. Google says it doesn't use it, and none of the AI companies whose crawlers did most of the fetching in our data (OpenAI, Anthropic, Perplexity, Meta) document reading it. It's harmless, so if your website builder offers a one-click toggle, turn it on and move on. If it would take you an afternoon, spend the afternoon on the things below instead.
llms.txt is a proposed file, placed at /llms.txt, that gives language models a Markdown summary of a site with links to its key pages. It started as a proposal in 2024 and spread quickly through website builders and SEO plugins. Adoption by the people building the assistants is the part that hasn't followed.
What the companies say
| Who | What they've said or done | Source |
|---|---|---|
| Google Search | "You don't need to create new machine readable files, AI text files, markup, or Markdown to appear in Google Search" | Google AI optimization guide, updated July 2026 |
| Google Search | "There are no additional requirements to appear in AI Overviews or AI Mode" | AI features and your website |
| Google (Gary Illyes) | Said Google doesn't support llms.txt and isn't planning to, at a Search Central Live event (as reported) | Search Engine Land |
| Google Chrome | Lighthouse 13.3 added an experimental "Agentic Browsing" audit that checks for llms.txt (May 2026). It's about browser agents, not search ranking | Search Engine Journal |
| OpenAI | Doesn't document reading llms.txt. A site owner posted logs showing OpenAI fetching it on a few sites (July 2025) | Search Engine Roundtable |
| Anthropic, Perplexity, Meta | Their crawler documentation doesn't mention llms.txt | Operator docs in our registry |
So the one Google product that looks at the file (Chrome's experimental audit) is about agents browsing a site on a user's behalf, and its own documentation says only that without the file "agents may spend more time crawling the site". The product that decides whether you show up in Google's AI answers says outright that it doesn't need it.
What the platforms do
Plenty of tools will make one for you, which is part of why the file feels important:
- Framer supports
/llms.txtand also serves a Markdown version of each page to agents that ask for it (Framer). - Webflow lets you upload one under Site settings, SEO, up to 100 KB (Webflow).
- Wix has an llms.txt API alongside its robots.txt API (Wix developers).
- Squarespace 7.1 added a native llms.txt setting under SEO/AI Visibility, according to a Squarespace designer's guide (July 2026).
- Yoast SEO generates one on WordPress and on Shopify (Yoast).
- This site serves one, generated from our page list, because it costs nothing.
What we see in our own data
Not enough to say anything, and we'd rather tell you that than stretch. cite-met's rollups record page views by path, not requests for machine-readable files like llms.txt and robots.txt, so this edition of the Observatory can't count how often AI agents fetch llms.txt on small-business sites. We're adding those counts for the next edition, and we'll update this page with what they show, including if it turns out assistants read the file more than their documentation suggests.
What our data does show is where AI agents spend their requests: on your actual pages. Over a third of AI fetches were assistants loading a page live for a user's question. Those fetches read the page itself, not a summary file.
What to do instead
- Make sure the text is in the HTML. Vercel found none of the major AI crawlers it measured run JavaScript. If your homepage is a script-filled shell, no text file fixes that. The access checker counts what they see.
- Leave AI search crawlers allowed in robots.txt (our robots.txt guide shows how to block training without blocking search).
- Answer the questions customers ask an assistant, in plain words on the page: what you do, where, for whom, what it costs, how to book.
- Then add llms.txt if it's a toggle. Keep it short: a heading with your business name, one paragraph on what you do, and links to your main pages.
Questions people ask
Does Google use llms.txt?
No. Google's AI optimization guide says you don't need machine-readable files, AI text files or Markdown to appear in Google Search, and Google's Gary Illyes has said Google doesn't support llms.txt and isn't planning to.
Does ChatGPT read llms.txt?
OpenAI doesn't document reading it. One site owner posted logs in July 2025 showing OpenAI's crawler fetching llms.txt files, but a fetch isn't evidence that the file changes what ChatGPT says.
Should a small business add an llms.txt file?
Only if your platform makes it a one-click setting. It won't hurt, but it isn't a ranking or citation factor anyone has documented. Server-rendered text, an open robots.txt and clear facts on your pages matter far more.