What is llms.txt and do I need one?
An llms.txt file is a markdown document located at your domain root that provides curated context about your product for LLMs and AI agents. It serves clean markdown summaries, API endpoints, and documentation to AI systems without requiring complex HTML rendering or web scraping. It is an experimental, optional interoperability proposal, not a proven ranking or citation requirement: do not treat it as required for AI search visibility.
Why llms.txt Matters for Developer Tools and AI Agents
An llms.txt file is a markdown document that serves as a machine-readable index of your product documentation and APIs, purpose-built for LLM context windows.
Developer agents (like Cursor, Claude Code, and Copilot) parse llms.txt to fetch precise documentation summaries without scraping extraneous HTML.
| File Spec | Location | Purpose |
|---|---|---|
| /llms.txt | Domain root (https://example.com/llms.txt) | Curated index of key product pages and tools |
| /llms-full.txt | Domain root (https://example.com/llms-full.txt) | Complete concatenated documentation for deep context |
Frequently Asked Questions
Is llms.txt required for SEO?
No. Traditional search engines like Google do not use llms.txt, but it helps IDE assistants, coding agents, and AI tools parse your documentation.
What is the recommended format for llms.txt?
Use standard markdown starting with an H1 brand title, a blockquote summary, and bulleted lists of URLs with one-line descriptions.
Can I generate llms.txt dynamically in Next.js?
Yes. Create an app/llms.txt/route.ts route handler that outputs markdown with Content-Type: text/plain; charset=utf-8.
How do I fix a missing llms.txt error?
Add an llms.txt file to your public root folder or export a dynamic route handler returning your curated product summary.