AI agents call dns_lookup to retrieve information from Domain-MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
DNS lookups are read-only operations that retrieve publicly available DNS records. No data is created, modified, deleted, or executed. The tool has minimal blast radius if misused by an AI agent, as DNS records are non-sensitive public information and the operation is passive.
From the tool's definition Tool performs 'Get DNS records for a domain' — a query operation that retrieves DNS information without modification or side effects.
Documented attack patterns abuse exactly the kind of access dns_lookup gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Domain-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for dns_lookup:
{
"version": "1",
"default": "deny",
"tools": {
"dns_lookup": {}
}
}dns_lookup is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get DNS records for a domain. It is categorised as a Read tool in the Domain-MCP MCP Server, which means it retrieves data without modifying state.
Register the Domain- MCP server in PolicyLayer and add a rule for dns_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 Domain-MCP. Nothing to install.
dns_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 dns_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 dns_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.
dns_lookup is provided by the Domain- MCP server (rinadelph/domain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Domain-MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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8 Domain-MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.