`check_domain`

13 servers reported a tool by this name when we called them. Names are chosen by whoever wrote the server, so two tools sharing a name do not have to do the same thing. We record what was reported, not what it does.

server	result when we called it	tools
arch-tools-mcp https://arch-tools-mcp.onrender.com/sse	answers-mcp	63
arch-tools-mcp https://arch-tools-mcp.onrender.com/mcp	answers-mcp	63
arch-tools https://archtools.dev/mcp	answers-mcp	63
fetcher.cloud https://api.fetcher.cloud/mcp	answers-mcp	19
namemyapp-mcp https://mcp.namemy.app/direct	answers-mcp	13
Qualisend https://app.qualisend.com/api/mcp	answers-mcp	12
phishunt-mcp https://mcp.phishunt.io/	answers-mcp	11
russia-access https://ruscrape.com/mcp	answers-mcp	9
UCP Checker https://ucpchecker.com/mcp	answers-mcp	8
agpc-guild https://guild.tradeuniquecapital.com/mcp	answers-mcp	4
agentdomainsearch https://agentdomainsearch.com/mcp	answers-mcp	3
mailverdict https://api.mailverdict.dev/mcp	answers-mcp	2
domain-rdap https://ads.getlulu.dev/domain/mcp	answers-mcp	1

13 of these answered an MCP handshake on the day we checked. That is not a promise the tool works, only that the server was running and told us the tool existed.