Glossary entry llms-txtFrameworks

llms.txt

A standardized text file at /llms.txt telling AI agents which pages summarize your site (adopted by ~10% of domains in 2026).

Filed under: Frameworks

Definition

llms.txt (specified at llmstxt.org) is a Markdown-formatted file at the root of a domain that tells AI agents which URLs are the most useful summary of the site. Anthropic's Claude and IDE coding agents (Cursor, Claude Code, Copilot, Windsurf) fetch it for retrieval. Adoption is ~10% as of 2026; presence is a recognized AI-readiness signal.

Example

# Your Site > One-line summary ## Docs - [Getting Started](https://yoursite.com/docs/start) ## Pricing - [Plans](https://yoursite.com/pricing)

How to optimize

Use VectorCite's generator at /audit/llms-txt to produce a spec-compliant llms.txt. Save it at /public/llms.txt in Next.js (or your CMS root). Validate with VectorCite's validator after deploy.

Check a page against a real AI answer

Claude’s live answer to your buyer’s question, its sources, your readiness score and the fixes. Free, no signup, about half a minute.

Run a free audit