llms.txt

Overview

AEO (Answer Engine Optimization) covers how your site is understood and cited by AI assistants (ChatGPT, Perplexity, Claude, etc.). llms.txt is the primary convention: a Markdown file at /llms.txt that gives models a curated map of your most important pages.

It complements (does not replace) robots.txt and sitemap.xml. It is not a W3C/IETF standard; treat it as durable, machine-readable site documentation you control.

Reference: llmstxt.org · GitHub spec repo

When to use llms.txt