AI agents call reverse_dns to retrieve information from Keel without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Reverse DNS lookup is a standard network diagnostic query that retrieves existing DNS information. It does not create, modify, delete, execute code, or trigger financial transactions. The operation is purely informational and read-only, consistent with other diagnostic tools like ping and dns_lookup on this server.
From the tool's definition Tool performs a 'reverse DNS lookup' which queries DNS records to retrieve domain name information associated with an IP address. This is a read-only operation with no side effects or data modification.
Attacks that exploit this kind of access
Perform a reverse DNS lookup for an IP address. It is categorised as a Read tool in the Keel MCP Server, which means it retrieves data without modifying state.
Register the Keel MCP server in PolicyLayer and add a rule for reverse_dns: 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 Keel. Nothing to install.
reverse_dns 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 reverse_dns 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 reverse_dns. 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.
reverse_dns is provided by the Keel MCP server (seayniclabs/keel). 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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