llms.txt Standard Gains Traction as 780+ Sites Guide AI Crawlers to Key Content

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In September 2024, fast.ai founder Jeremy Howard proposed llms.txt, a plain-text Markdown file placed at a website's root that tells AI models which pages matter most. The format is intentionally minimal, requiring just a site name, a brief summary, and categorised links to important pages. Major tech companies including Cloudflare, Stripe, Anthropic, Vercel, and Zapier have since adopted the standard, with over 780 websites now publishing the file. A companion file, llms-full.txt, can optionally contain the full text of key pages concatenated together, allowing AI models with large context windows to ingest entire documentation sets at once. The standard addresses a gap left by XML sitemaps, which list all URLs without hierarchy or context about what content is most relevant.

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