subdomain_enum · Kali MCP: Risk & Policy

WHAT IT DOES

What subdomain_enum does on Kali

AI agents invoke subdomain_enum to trigger actions in Kali. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why subdomain_enum needs a policy

Subdomain enumeration actively probes DNS infrastructure and potentially sends network requests to third-party services/targets. Running on a Kali Linux penetration testing server with tools like Nmap, Hydra, and SQLMap, this tool performs active reconnaissance that constitutes external network operations. It goes beyond a simple read/query — it executes multiple discovery methods against target infrastructure.

From the tool's definition 'Discover subdomains using multiple methods (amass-style enumeration)' — active enumeration against external targets using multiple reconnaissance methods

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

subdomain_enum Rate-limited

subdomain_enum stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "subdomain_enum": {
      "limits": [
        {
          "counter": "subdomain_enum_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Kali, so you can run agents against it safely.

FAQ

Questions about subdomain_enum

What does the subdomain_enum tool do? +

Discover subdomains using multiple methods (amass-style enumeration). It is categorised as a Execute tool in the Kali MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on subdomain_enum? +

Register the Kali MCP server in PolicyLayer and add a rule for subdomain_enum: 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 Kali. Nothing to install.

What risk level is subdomain_enum? +

subdomain_enum is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit subdomain_enum? +

Yes. Add a rate_limit block to the subdomain_enum 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.

How do I block subdomain_enum completely? +

Set action: deny in the PolicyLayer policy for subdomain_enum. 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.

What MCP server provides subdomain_enum? +

subdomain_enum is provided by the Kali MCP server (rangta10/kali-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.