What Is llms.txt?

llms.txt is a relatively new convention for making websites AI-friendly. It serves a similar purpose to robots.txt (which tells crawlers what to access) and sitemap.xml (which lists all pages)—but llms.txt is specifically designed for Large Language Models. What llms.txt contains: • Business name and description • Key services and capabilities • Site structure and navigation • Important pages and their purposes • Contact information llms-full.txt is the extended version: • Every URL on the site, grouped by cluster • Detailed descriptions of each page • Service details and specifications • Location information Why it matters: When an AI assistant encounters your domain, llms.txt provides an instant, structured overview of everything your business does. Instead of crawling and interpreting every page, the AI can read one file and understand your entire business. Most websites do not have llms.txt files. Most website platforms do not even support them. This is a significant competitive advantage for MyFast.ai clients—their businesses are immediately understandable by every major AI assistant. Every MyFast.ai website includes both llms.txt and llms-full.txt as part of the standard build.