llms.txt — your AI-era identity file

/llms.txt is a small, plain-text file at the root of your site. Think of it as a business card for machines: who you are, what the product does, and where humans and agents should look next.

Why agents skip you without it

Crawlers and assistants already have your marketing page. They do not have a compact, factual map of intent, boundaries, and pointers to deeper docs. Without /llms.txt, everything becomes guesswork from layout and hero copy.

What StackApps actually checks

Our scanner issues HEAD to {yourAppUrl}/llms.txt and requires HTTP 200. That is the baseline check. We also GET the body for CLI and MCP hints when those files exist.

What to put in the file

Product name and one-line purpose, primary audience, links to docs/pricing/support, and optional install hints (npx, brew install) if real. Bronze tier requires reachable site plus robots.txt, sitemap.xml, and /llms.txt returning 200.

See also: /faq guide, CLI & Silver, free scan.