Looksup whois information about the Top Level Domain (TLD)
AI agents call whois_tld to retrieve information from Whois MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only WHOIS lookup for TLD information. It retrieves publicly available registration and domain data without creating, modifying, or deleting any information. The blast radius is minimal as the tool only returns data and has no side effects on systems or data stores. Low severity is appropriate for informational queries of public records.
From the tool's definition Tool description states 'Looksup whois information' and server description specifies 'retrieve domain registration details' without mentioning modifications, deletions, or side effects. The operation is a passive query of public WHOIS data.
Documented attack patterns abuse exactly the kind of access whois_tld gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Whois MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for whois_tld:
{
"version": "1",
"default": "deny",
"tools": {
"whois_tld": {}
}
}whois_tld is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Looksup whois information about the Top Level Domain (TLD). It is categorised as a Read tool in the Whois MCP MCP Server, which means it retrieves data without modifying state.
Register the Whois MCP server in PolicyLayer and add a rule for whois_tld: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Whois MCP. Nothing to install.
whois_tld is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the whois_tld rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for whois_tld. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
whois_tld is provided by the Whois MCP server (modelcontextprotocol-servers/whois-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Whois MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
4 Whois MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.