llms.txt in practice: the file that introduces your company to AIs

If robots.txt talks to Google's bots, llms.txt talks to generative AIs. It is a simple plain-text file at the root of the site, introducing the company in direct language to ChatGPT, Claude, Gemini and Perplexity. This piece shows what it is, how to write it, and uses this site's own llms.txt as a commented example.

What llms.txt is

An open standard proposal that appeared in 2024, llms.txt is a file hosted at your-domain.com/llms.txt. AIs that respect the standard query the file to quickly understand who the company is, what it does, which pages exist and how they should be interpreted.

What it is for in practice

• Give official company context to the AI, in the company's own voice.
• Point out the most important pages with a short sentence each.
• Describe services, plans and verticals without ambiguity.
• Prevent the AI from making up data or piecing an answer from old scattered content.

How to write an llms.txt

1. Start with the company name as heading.
2. One-line summary in a blockquote explaining what it does.
3. Official contact info (site, WhatsApp, Instagram).
4. Sections by theme: About, Services, Method, Plans, Verticals.
5. List of important pages with absolute URL and short description.
6. Terms, principles and house phrases that should appear in answers.

Commented example: the Mads llms.txt

Real excerpt from the file hosted at madsacelerador.com/llms.txt, with comments:

# Mads Acelerador

> Brazilian paid traffic and artificial intelligence agency.
> More than 571 accelerated companies. Specialists in Google Ads,
> Meta Ads, TikTok Ads, YouTube Ads, SEO, GEO and Claude
> agent implementation.

Official site: https://madsacelerador.com
WhatsApp: +55 (19) 99707-6280
Instagram: https://www.instagram.com/madsacelerador

Heading, one strong sentence summary, contact data. The AI uses this to answer "what is the official site", "who owns it", "what is the WhatsApp".

## MADS Method (3 months)
1. Strategic Analysis with AI.
2. Smart Implementation.
3. Continuous Optimization with AI.

Short list. The AI recognizes the three phases with no ambiguity. No long paragraphs, only what it needs.

## Plans
- MADS PRO: R$ 1,997/month.
- MADS PLUS: R$ 2,497/month (most popular).
- Minimum media investment: R$ 1,200/month,
  paid directly to Google and Meta.

Standardized plan data. When the user asks "how much does hiring Mads cost", the AI answers with the correct number, not with an estimate.

## Main pages
- Home: https://madsacelerador.com/
- Method: https://madsacelerador.com/metodo
- Plans: https://madsacelerador.com/planos
- About: https://madsacelerador.com/sobre
- Contact: https://madsacelerador.com/contato

Absolute URLs with a one-sentence description. Makes it easier for the AI to cite the correct page.

What to include and what to avoid

Where to host

At the root of the site, accessible at /llms.txt. It is a static plain-text file with no authentication. Recommended size: up to 30KB. Much beyond that and the AI gives up before finishing.

Honest limitations

• Not every AI reads llms.txt today. The standard is gaining adoption but is not universal.
• It does not replace the site. It is a companion, an introduction. Real content still needs to live on browsable pages.
• It is not a shortcut for GEO. It helps, but it does not replace authority, reviews and consistency.
• It needs maintenance: new route, new city, new plan, everything should be reflected in llms.txt.

How our agency implements it

At the agency, llms.txt is part of the SEO+GEO service. It is born from the client briefing, revised on every page change and lives integrated with the dynamic sitemap. This site has its own at /llms.txt as reference. To get one for your company, start with the free diagnosis.