AI agents call fetch_whois_data to retrieve information from pentestMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
WHOIS queries retrieve publicly available domain registration data without creating, modifying, deleting, or executing any operations. Even in a penetration testing context, this tool performs passive reconnaissance only.
From the tool's definition Tool name is 'fetch_whois_data' and description states 'Fetch WHOIS data for the given domain.' The verb 'fetch' combined with querying publicly available WHOIS information indicates a read-only operation with no side effects or data modification.
Documented attack patterns abuse exactly the kind of access fetch_whois_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and pentestMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for fetch_whois_data:
{
"version": "1",
"default": "deny",
"tools": {
"fetch_whois_data": {}
}
}fetch_whois_data is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch WHOIS data for the given domain. It is categorised as a Read tool in the pentestMCP MCP Server, which means it retrieves data without modifying state.
Register the pentest MCP server in PolicyLayer and add a rule for fetch_whois_data: 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 pentestMCP. Nothing to install.
fetch_whois_data 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 fetch_whois_data 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 fetch_whois_data. 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.
fetch_whois_data is provided by the pentest MCP server (ramkansal/pentestmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 36 pentestMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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36 pentestMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.