Most websites are invisible to AI assistants like ChatGPT and Claude. llms.txt is a new open standard that fixes this a simple file that tells AI what your website is about and how to use it. llmstxtdirectory.org makes it easy to get started. Generate a complete llms.txt file for free in seconds by pasting your URL. Check whether any website already has one, and explore a growing public directory of 80+ sites already using the standard.