Agentic Resource Discovery Checker
This checks whether a website has published an Agentic Resource Discovery (ARD) catalog, the small file AI agents read to find out what a site can do for them. The standard shipped in June 2026, so most sites do not have one yet. A "no catalog" result is the norm right now, not an error.
New to this?
What's this for?
Picture the web as a hotel. Your site is a room, an AI agent is the concierge, and it finds who can help by reading a small card each room pins by its door. That card is the ai-catalog.json file. This tool checks whether yours is up, valid, and readable, and lists the 4 ways to advertise it.
Almost no site has a card yet, including the companies that launched the spec, so do not be surprised by a "no catalog" result on most domains. It just means there is nothing there for an agent to read, and it turns what is missing into a short setup list.
New to the idea? The full write-up explains Agentic Resource Discovery in plain English and walks through how I shipped it on this site.
How does this work?
The checker fetches the site and looks in all 4 places ARD lets you advertise a catalog, the well-known file, a robots.txt line, a link tag, and an HTTP header. It validates the catalog against the spec, then requests it as a browser, as named AI agents like GPTBot and ClaudeBot, and as generic clients, to see who gets through. It runs from Cloudflare's edge, so a firewall that only blocks certain networks may read differently here than from your own machine.
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