Start with the llms.txt proposal, maintained by its author. It describes a Markdown guide that helps agents find useful website content, with links to detailed resources and clean text versions.
Review its format, examples, and changes before adopting a third-party template. llms.txt is not a replacement for robots.txt, authentication, or search indexing controls, and support varies between tools.
For a practical example, read the implementation guide. If your site is hosted by answer.cloud, maintain the source content and let the deployment or CMS publishing workflow generate its discovery files.