Is your MCP server answering?
If your server is in the MCP Registry, addrbook already checks it: an initialize and a tools/list request, up to once an hour, with the result dated on a public page. Find yours and see what the last check found.
How many answer
| Source | Listed | Checked so far | Answered their last check |
|---|---|---|---|
| MCP Registry | 50,023 | 3,300 | 86.4%2,851 agents |
Servers the MCP Registry lists today. As of ; the share answering is of those checked so far. All the numbers
What each check records
- Whether the server answered, and when it last did.
- Its response time, and uptime over 24 hours and 30 days.
- How many tools it lists, and the date the list last changed.
No tool is ever called. The probe policy says exactly what is sent and how often.
Alerts are not open yet
Next: claiming your profile, and an email when your server stops answering or its tool list changes. To be told when that opens, or to tell us what an alert should catch, write to us.
Rather not be checked? Write to optout@addrbook.com; opt-outs are honoured within 24 hours.