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The H1 title and blockquote description are the first things AI assistants read. Keep the description to 2-3 clear sentences about what your site does.
Each H2 section groups related links. Add your most important pages first. Use the Optional section for lower-priority content.
Everything you need to know about the llms.txt standard in 2026.
Proposed by Jeremy Howard (Answer.AI) in September 2024, llms.txt is a Markdown file at yoursite.com/llms.txt that tells AI assistants what your site contains and which pages are most important.
Over 844,000 websites have added llms.txt as of 2026, including Anthropic, Stripe, Cloudflare, and Vercel. Support is growing across AI tools, though not yet universal.
robots.txt is a security guard: it restricts which pages crawlers can access. It controls access.
llms.txt is a tour guide: it tells AI assistants where to find important content and how to understand it. It does not restrict access — it curates it.
Both files serve different purposes and should coexist at your domain root.
llms.txt uses standard Markdown. The only required element is the H1 title:
# Site Name > 1-3 sentence description. ## Section Name - [Page Name](https://url): Description ## Optional - [Secondary Page](https://url): Less critical
The ## Optional section is special: AI systems skip it when their context window is limited.
llms.txt is a curated index with links. Small, fast, easy to maintain. AI assistants use it to navigate your content.
llms-full.txt contains the complete text of every page in one file. Anthropic's is 481,000 tokens. Used for deep offline reference.
For most sites, llms.txt alone is sufficient. Only add llms-full.txt if you have extensive documentation that AI tools need to query comprehensively.
Common questions about llms.txt in 2026.
>) directly below your H1 title should be 1-3 sentences that answer: what is this site, who is it for, and what can someone do here? Write it as if explaining your site to a smart person who has never heard of it. Keep it factual — AI assistants use this to set context before reading the rest of your file.## Optional section is a special signal in the llms.txt spec. Links under this heading tell AI systems "this content is lower priority — skip it if your context window is limited." Use it for older blog posts, secondary resources, or anything that's useful but not essential for understanding your site./llms.txt to the file's CDN URL.