enum_subdomains
AI agents call enum_subdomains to retrieve information from MCP Server Foundation Template without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Subdomain enumeration retrieves information about target infrastructure without modifying or deleting data. This is a Read operation as it queries and lists subdomain information. Severity is medium because while it has limited direct blast radius, it facilitates reconnaissance that could enable further attacks.
From the tool's definition The tool name 'enum_subdomains' indicates enumeration of subdomains, a reconnaissance activity that retrieves/queries DNS or similar data sources to discover domain structure.
Attacks that exploit this kind of access
enum_subdomains. It is categorised as a Read tool in the MCP Server Foundation Template MCP Server, which means it retrieves data without modifying state.
Register the MCP Server Foundation Template MCP server in PolicyLayer and add a rule for enum_subdomains: 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 MCP Server Foundation Template. Nothing to install.
enum_subdomains 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 enum_subdomains 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 enum_subdomains. 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.
enum_subdomains is provided by the MCP Server Foundation Template MCP server (joeyheath65/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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