llms.txt is a plain Markdown file served at /llms.txt on a website, providing a lightweight summary of important content for LLMs (Language Model Models) to read.
It helps expose content with structure and meaning, making it easier for AI tools to understand and generate higher-quality results.
LLM traffic is projected to increase from 0.25% of search in 2024 to 10% by the end of 2025, making it important to implement llms.txt now.
Tools like Mintlify can automatically generate llms.txt, and efforts like Model Context Protocol (MCP) are exploring further integration of LLMs with web content.