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?
If this tool saves you time, you can sponsor the work on GitHub.
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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