Perform a basic WHOIS-style lookup using DNS information
AI agents call whois_lookup to retrieve information from DNS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
WHOIS lookup is a standard information retrieval operation that queries publicly available DNS and domain registration data. It has no side effects, does not modify data, does not execute code or commands, and does not incur financial obligations. The blast radius of misuse is minimal - an attacker could only gather publicly available information about domains. This is classified as Read with low severity.
From the tool's definition The tool is described as "Perform a basic WHOIS-style lookup using DNS information" - it retrieves and queries DNS/WHOIS data without modifying, deleting, or executing operations.
Attacks that exploit this kind of access
Perform a basic WHOIS-style lookup using DNS information. It is categorised as a Read tool in the DNS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the DNS MCP Server MCP server in PolicyLayer and add a rule for whois_lookup: 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 DNS MCP Server. Nothing to install.
whois_lookup 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_lookup 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_lookup. 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_lookup is provided by the DNS MCP Server MCP server (stanibaj/dns-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →