llms.txt validator and generator

Checks a site's llms.txt against the llmstxt.org format and tests its links, or drafts one from your sitemap.

Updated 30 October 2026

Generate an llms.txt

No file yet? The generator reads your home page and sitemap and drafts one for you to edit.

What it checks

That /llms.txt exists and is a text file, not your home page served at every address
The llmstxt.org format: one H1 with the site name, an optional "> " summary, then H2 sections of "- [name](url): notes" links, with an Optional section for links an assistant may skip
Relative and http:// links, empty sections, missing notes and a file too large to be a map
Up to eight of its links, tested, and whether llms-full.txt exists

Use it from code or an AI agent

The same check is a free JSON API and an MCP tool. No key, no sign-up.

curl "https://aeolookup.com/api/aeo/llms-txt?url=example.co.uk"

MCP: add https://aeolookup.com/mcp as a remote server and call validate_llms_txt. API and MCP documentation.

Questions people ask

What is llms.txt?

A proposal from Jeremy Howard, published in September 2024, for a markdown file at /llms.txt that gives language models a short map of a site: its name, a one-line summary and links to the pages that matter. It is not a standard and no search engine requires it.

Do ChatGPT, Claude or Google read llms.txt?

Rarely, on the evidence. Ahrefs studied server logs for 137,210 domains in May 2026 and found 97% of about 38,000 sites with a valid file had no request for it that month. Google's John Mueller said in June 2025 that no AI system currently uses it, and Google does not support it.

Should I add one anyway?

If it takes you ten minutes, yes: it does no harm, some coding assistants and agents read such files, and the generator here drafts it from your sitemap. Do not expect traffic or citations from it, and spend your effort on crawler access and clear pages first.

What is the difference between llms.txt and llms-full.txt?

llms.txt is the map: names and links. llms-full.txt, where a site offers one, holds the full text of the important pages in one file, so a model can read everything without following links.

The other free AEO tools

AI crawler checkerWhich AI assistants may read your site, from your robots.txt, your page's robots tags and what your firewall sends each crawler.Schema checkerReads every JSON-LD block on a page, checks each against the properties Google and answer engines use, and scores how clearly it says who you are.Answer-readiness checkerScores a page out of 100 on the things that make an answer engine able to quote it correctly, with the fixes worth most points first.Full AEO auditRuns the crawler, schema, llms.txt and answer-readiness checks on one address at once.