llms.txt Validator

A proposed convention (llmstxt.org) for a Markdown file at /llms.txt that gives AI assistants a curated, structured summary of your site — who you are and which pages matter — instead of leaving them to infer it from crawling.

The convention’s core shape: one H1 with your site name, a blockquote (“> …”) summary right after it, then H2 sections whose bullet lists contain [title](url) links, each with an optional description after a colon.

Up to 5, in URL mode only — enough to catch a file full of dead links without slowing the check down. Pasted content skips the live spot-check since relative links have no domain to resolve against.

Adoption is still emerging and no major provider guarantees it. It is a low-effort, forward-looking file: it cannot hurt, some tools already read it, and a valid structure means you are ready as adoption grows. Treat these results as advisory.

At your domain root: https://yoursite.com/llms.txt, served as plain text. The URL mode of this validator checks exactly that location.