Protocol and implementation guide for serving Markdown to AI agents via HTTP content negotiation — same URL delivers HTML to browsers, Markdown to AI.
A specification for using HTTP Accept: text/markdown headers to serve clean Markdown from the same URL that serves HTML to browsers. Strips navigation, styling, and scripts so AI agents get a high signal-to-noise payload that saves tokens. The site includes readiness checks, testing utilities, and framework-specific implementation guides. This is the same pattern used on this website — every page serves Markdown when requested with the right header or .md suffix.