llms.txt sits at the site root and is structured markdown: an H1 with the product name, a blockquote summary, then sections of bullet links to the URLs LLMs should preferentially read. Different from a sitemap — sitemaps are exhaustive, llms.txt is curated.
The convention was proposed in 2024 by Jeremy Howard. By 2026, ChatGPT, Claude, Perplexity, and the major embed-the-web tools all check for it. It's an opt-in signal: "if you're an LLM trying to understand this site, here are the canonical entry points."
lrok publishes /llms.txt at the root. It enumerates docs, integrations, use-cases, comparisons, blog posts, and tools — about 100 URLs of curated entry points.