nmap_stealth_scan · Nmap MCP Server MCP: Risk & Policy

WHAT IT DOES

What nmap_stealth_scan does on Nmap MCP Server

AI agents invoke nmap_stealth_scan to trigger actions in Nmap MCP Server. 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 nmap_stealth_scan needs a policy

A stealth SYN scan actively sends crafted network packets to target hosts to probe open ports while avoiding standard detection mechanisms. This is an Execute-category action because it triggers real external network operations whose effects depend on the target argument.

From the tool's definition "Perform stealth scan (SYN scan) with minimal detection" — actively executes network scanning operations against external targets using SYN packets designed to evade detection

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

nmap_stealth_scan Rate-limited

nmap_stealth_scan 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": {
    "nmap_stealth_scan": {
      "limits": [
        {
          "counter": "nmap_stealth_scan_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 Nmap MCP Server, so you can run agents against it safely.

FAQ

Questions about nmap_stealth_scan

What does the nmap_stealth_scan tool do? +

Perform stealth scan (SYN scan) with minimal detection. It is categorised as a Execute tool in the Nmap MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on nmap_stealth_scan? +

Register the Nmap MCP Server MCP server in PolicyLayer and add a rule for nmap_stealth_scan: 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 Nmap MCP Server. Nothing to install.

What risk level is nmap_stealth_scan? +

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

Can I rate-limit nmap_stealth_scan? +

Yes. Add a rate_limit block to the nmap_stealth_scan 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 nmap_stealth_scan completely? +

Set action: deny in the PolicyLayer policy for nmap_stealth_scan. 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 nmap_stealth_scan? +

nmap_stealth_scan is provided by the Nmap MCP Server MCP server (mohdhaji87/nmap-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.