Agentic Usability Index · updated 2026-09-22
Can your agent use this site?
Paste a URL. We test whether AI agents like Muse, ChatGPT Agent, Claude, Comet, Grok Bot and Instinct can get in, read, and act on it. Then we tell the site exactly how to fix it.
Sites graded
40
on the public Index
Block at least one identified agent
26
of 40, by robots.txt or at the door
Publish an llms.txt
8
of 40
Publish a Content-Signal
0
of 40 · 1 speaks UCP
Recently scanned by visitors
Anyone can scan any site. Visitor scans get a report card but do not join the public Index.
Run a site? Three changes move you up the Index this week
1 · Say your stance
Tell agents what's allowed instead of making them guess. Moves Access and Consent.
User-Agent: *
Content-Signal: search=yes, ai-input=yes
Allow: /2 · Let verified agents in
Stop sniffing user-agents. Verify Web Bot Auth signatures and allow the agents that sign. Moves Access.
Signature-Agent: "https://agent.example"
Signature-Input: sig1=("@authority" "signature-agent");created=…;expires=…;keyid="…";tag="web-bot-auth"3 · Give agents a front door
Publish a UCP or MCP manifest so agents don't have to drive your UI. Moves Protocols.
GET /.well-known/ucp
{ "ucp": { "version": "2026-01-23", "services": { "dev.ucp.shopping": [ … ] } } }Full guide with six steps and real syntax: For site owners →