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llms.txt checker: is your file valid?

We fetch /llms.txt and check it is non-empty and not HTML, then check for an H1 line starting with # and at least one Markdown link.

Why it matters

llms.txt is a short Markdown index written for language models. Without it an agent has to guess which pages matter from navigation HTML. A file that exists earns 3 points; the extra 2 require the H1 title and a Markdown link list, because a file without them is not a usable index. A 200 response that returns your HTML homepage does not count.

How to fix it

1. Create /llms.txt at the site root and serve it as text/plain or text/markdown.
2. Start with an H1: # Your Site Name.
3. Add a one-line summary as a blockquote: > What the site offers.
4. List key pages as links under H2 sections: - [Pricing](https://example.com/pricing): plans and limits.
5. Make sure unknown paths do not fall back to the HTML homepage with status 200.

How to verify

Run curl -s https://example.com/llms.txt | head -5 and confirm it begins with # .

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Related checks

• llms-full.txt / .md of key pages
• No walls
• Content without JS
• Headings
• Text/HTML ratio

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