dns_lookup
AI agents call dns_lookup to retrieve information from DoH MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
DNS lookup is a read-only operation that retrieves DNS records. While there's an indirect medium severity (DNS lookups can be abused for reconnaissance, enumeration, or DoS), the tool itself causes no data modification, deletion, or financial impact. An AI misusing this could perform excessive DNS queries or extract network topology information, but the tool's primary function is query/retrieval only.
From the tool's definition Tool is part of a DNS over HTTPS (DoH) query system that 'query[ies]' and 'return[s] DNS resolution results'. The tool name 'dns_lookup' and server description confirm this retrieves DNS data with no side effects.
Attacks that exploit this kind of access
dns_lookup. It is categorised as a Read tool in the DoH MCP Server MCP Server, which means it retrieves data without modifying state.
Register the DoH MCP Server 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 DoH MCP Server. 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 DoH MCP Server MCP server (randark-jmt/doh-mcp). 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.
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