Does your business website need an llms.txt file?

llms.txt is a plain Markdown file placed at the root of a website (yoursite.com/llms.txt) that gives large language models a short, readable summary of the site and a list of links to its most useful pages. The proposal at llmstxt.org was published by Jeremy Howard on September 3, 2024, and describes the file as a way to "provide LLM-friendly content."

The format is simple. According to the llmstxt.org specification, the only required part is a top heading with the site or project name. After that come an optional one-paragraph summary in a blockquote, optional notes, and sections of links written as [Page name](URL) with a short description. A section titled "Optional" can hold secondary links an AI tool may skip.

The idea came from software documentation. Developer tools have long pages, and AI coding assistants work better with a clean map of them. A dental practice, a law firm or a property manager has a different kind of site: a home page, ten to thirty service and location pages, an about page and a contact page.

No. robots.txt tells crawlers what they may and may not fetch, and well-behaved crawlers follow it. llms.txt makes no rules at all. It is a suggested reading list, and nothing obliges an AI system to request it or use it.

If your goal is to control whether AI crawlers can access your pages, robots.txt is still the file that does that job. If your goal is to be understood and recommended, llms.txt is at best a small supplement.

Google Search does not. Google's guide to optimizing for generative AI features on Search (last updated July 10, 2026) says you do not need to create "new machine readable files, AI text files, markup, or Markdown" to appear in Google Search, and that doing so "will neither harm nor help" visibility because "Google Search ignores them."

Google staff said the same thing earlier. Search Engine Journal reported in April 2025 that Google's John Mueller compared llms.txt to the old keywords meta tag and said that, as far as he knew, none of the AI services had said they use it. Search Engine Land reported that Google's Gary Illyes said at a Search Central event in the Asia Pacific region that Google does not support llms.txt and is not planning to.

There is one twist. Search Engine Journal reported in May 2026 that Chrome's Lighthouse 13.3 added an experimental "Agentic Browsing" category that includes an llms.txt check. That check is about how ready a site is for AI agents that browse on a user's behalf. It is separate from Lighthouse's SEO audits and says nothing about rankings or citations.

We could not find a public commitment from the major AI assistant companies to read llms.txt on business websites. That can change, so treat any claim that the file will get you recommended by AI tools with suspicion until the company behind the tool says so itself.

Add one only after the basics are in place, and only if it is quick. The cost is small: one text file, written once and updated when you add or remove a service. The upside is speculative. That makes it a reasonable last step, not a first one.

A good case for adding it: your site is already in good shape, you publish useful guides or FAQs, and you want any agent that does look for the file to find a clean list of your services and contact details. A poor case: your service pages are thin, your hours are wrong on Google, and someone is selling llms.txt setup as an AI visibility package.

The same things that help people choose you. Google's AI optimization guide tells site owners to keep following foundational SEO practices, make pages for their audience, and treat AI visibility as part of normal search work rather than separate tricks. It also says Google Business Profile and Merchant Center can help products and services appear in AI responses.

For a service business, that turns into a short list:

• One clear page per core service that says what it is, who it is for, where you offer it, what it costs or how pricing works, and how to book.
• Answers to the questions customers ask before they call, written on the page where they come up.
• Structured data that matches what is visible on the page, especially your business name, address, hours and phone number.
• A complete Google Business Profile with accurate categories, services, hours and photos, plus consistent details on the other directories that matter in your industry.
• Recent, genuine reviews that mention the services you want to be known for.
• Pages that load fast on a phone and can be crawled without errors.

Keep it short and accurate. A useful version for a small service business is 15 to 40 lines. Follow the llmstxt.org structure:

• Line 1: a top heading with your business name, for example "# Your Business Name".
• A one or two sentence summary in a blockquote: what you do, for whom, and where.
• A short paragraph with hours, service area, booking method and the main contact email.
• A "## Services" section linking to each service page with a one-line description.
• A "## About" section linking to your about, team and reviews pages.
• An "## Optional" section for blog posts or guides.
• Upload it to the root of your site, open yoursite.com/llms.txt in a browser to confirm it loads, and add a calendar reminder to update it whenever your services change.

Whoever owns your website content. The file should change when your service pages change, so it belongs with the person or partner who edits those pages, not with a separate AI vendor. If you use a builder like Squarespace or Wix, check whether it allows a root-level text file; some platforms do not, and that is not worth a migration.

When Monvell builds or audits a site, llms.txt sits at the end of the checklist, after service pages, structured data and profile accuracy are done. The free digital audit covers those higher-impact items first.