Cloudflare’s isitagentready.com asks whether a site is actually usable by an AI agent, not just a browser. Most of the plugins I looked at for this problem did too much: content negotiation, user-agent sniffing, custom converters running on every request.
This one does what I want and need. Every post and page gets a markdown version generated once, at save time, so serving a .md URL is just a meta lookup with no processing on the way out. It builds /llms.txt and /llms-full.txt indexes, serves /.well-known/security.txt and a /.well-known/api-catalog, and adds Agent Skills discovery so an agent can learn how to use the markdown endpoints instead of scraping HTML.
It also declares Content Signals in robots.txt: whether AI crawlers can index this site, retrieve it live, or use it to train a model, answered separately for each, per crawler.
This page has a markdown twin. Add .md to the URL and see for yourself.