scan_device_ports · Network Scanner MCP: Risk & Policy

WHAT IT DOES

What scan_device_ports does on Network Scanner MCP

AI agents invoke scan_device_ports to trigger actions in Network Scanner MCP. 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 scan_device_ports needs a policy

Port scanning actively sends network probes to external devices, triggering external operations with potential side effects such as alerting IDS/IPS, consuming target resources, or revealing network recon activity. This goes beyond passive reads — it executes active network operations. The sibling tools and server description confirm this is an active scanning platform.

From the tool's definition Tool name 'scan_device_ports' combined with server context: 'port scanning, service fingerprinting, and infrastructure monitoring for autonomous AI systems'. Description is empty, lowering confidence.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scan_device_ports Rate-limited

scan_device_ports 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": {
    "scan_device_ports": {
      "limits": [
        {
          "counter": "scan_device_ports_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 Network Scanner MCP, so you can run agents against it safely.

FAQ

Questions about scan_device_ports

What does the scan_device_ports tool do? +

scan_device_ports. It is categorised as a Execute tool in the Network Scanner MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on scan_device_ports? +

Register the Network Scanner MCP server in PolicyLayer and add a rule for scan_device_ports: 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 Network Scanner MCP. Nothing to install.

What risk level is scan_device_ports? +

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

Can I rate-limit scan_device_ports? +

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

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

scan_device_ports is provided by the Network Scanner MCP server (marc-shade/network-scanner-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.