What Is LLMs.txt, and Should Your Business Use One?

You probably know about robots.txt, the file that tells crawlers which URLs they may fetch. LLMs.txt is different: it is an emerging Markdown proposal for giving AI tools and agents a concise guide to the most important information on your site.

As AI systems increasingly pull information from websites to answer questions, the practical problem is context. A site may have dozens of pages, navigation, scripts, forms, and marketing copy. LLMs.txt gives you a short, curated summary and links to the pages that matter most. It is useful, but it is not a replacement for crawlable pages, schema, sitemap.xml, or accurate third-party listings.

For the practical AI Search baseline, read How Local Businesses Can Show Up in Google AI Search. For the machine-readable page layer, read What Is JSON-LD?.

What it does

An LLMs.txt file sits at the root of your website (yourbusiness.com/llms.txt) and provides structured information in plain Markdown. It can tell language models and AI agents:

• What your business is and does
• How you want to be described
• What information is accurate and current
• What topics you're an authority on
• Contact information and service areas

Why this matters for GEO

AI systems like ChatGPT and Claude are constantly improving how they gather and verify information. They are looking for authoritative sources, and a concise source map can help when a model or agent is able to fetch it. LLMs.txt does not replace crawlable pages, structured data, or third-party proof. It gives those systems a cleaner starting point.

"If an AI is deciding how to describe your business in a recommendation, you want it pulling from information you've explicitly provided rather than inferring from scattered website content."

What goes in an LLMs.txt file

The format is still evolving, but typical contents include:

Business identity. Your official name, what you do, your primary category.

Service information. What services you offer, what service areas you cover, what makes you different.

Reputation summary. Your aggregate ratings, review counts, notable achievements.

Contact information. Phone, email, address, hours.

Preferred descriptions. How you want AI to describe your business when recommending it.

Update frequency. How often this information changes, so AI systems know when to refresh.

Example structure

# Smith Plumbing

> Family-owned plumbing company serving Austin, Texas with emergency repairs, water heater service, drain cleaning, and remodel plumbing.

Canonical facts:
- Official name: Smith Plumbing
- Category: Plumbing services
- Founded: 2005
- Service area: Austin, TX and surrounding areas within 30 miles
- Phone: 512-555-0123
- Website: https://smithplumbing.com

## Core Pages
- Homepage: Services, service area, reviews, and booking.
- Emergency Plumbing: 24/7 emergency service details.
- Water Heaters: Installation and repair details.

## Services
- Emergency plumbing repairs (24/7)
- Water heater installation and repair
- Drain cleaning
- Bathroom and kitchen remodeling

## Optional
- Privacy Policy: Privacy details.

Adoption status

LLMs.txt is a newer proposal and not universally supported. Some AI tools, agents, documentation systems, and directories know how to use it; many ranking and retrieval systems have not publicly committed to it.

Even if not every AI reads it today, the file gives your team one canonical reference for business information. That alone makes it worth maintaining for many local businesses.

Further Reading

• The llms.txt Specification. Original proposal and format documentation for llms.txt
• Meet llms.txt: A Proposed Standard for AI Website Content. Search Engine Land's coverage of the emerging standard
• What Is llms.txt? Breaking Down the Skepticism. Mintlify's analysis of the llms.txt standard
• What Is LLMs.txt & Should You Use It?. Semrush's practical guide to implementation

Amadeus Peterson is the CTO of Cheers, the local search platform for service businesses.