quick_scan · MCP Port Scanner MCP: Risk & Policy

WHAT IT DOES

What quick_scan does on MCP Port Scanner

AI agents invoke quick_scan to trigger actions in MCP Port Scanner. 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 quick_scan needs a policy

Port scanning is an active network operation that sends packets to external hosts to probe open ports. This constitutes execution of network-level operations with real effects on target systems. It can be considered reconnaissance/intrusive depending on context, and misuse could violate laws (unauthorized scanning) or trigger security alerts.

From the tool's definition '快速端口扫描' (quick port scan) - triggers external network scanning operations against target systems

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

quick_scan Rate-limited

quick_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": {
    "quick_scan": {
      "limits": [
        {
          "counter": "quick_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 MCP Port Scanner, so you can run agents against it safely.

FAQ

Questions about quick_scan

What does the quick_scan tool do? +

快速端口扫描（仅端口扫描层）. It is categorised as a Execute tool in the MCP Port Scanner MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on quick_scan? +

Register the MCP Port Scanner MCP server in PolicyLayer and add a rule for quick_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 MCP Port Scanner. Nothing to install.

What risk level is quick_scan? +

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

Can I rate-limit quick_scan? +

Yes. Add a rate_limit block to the quick_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 quick_scan completely? +

Set action: deny in the PolicyLayer policy for quick_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 quick_scan? +

quick_scan is provided by the MCP Port Scanner MCP server (relaxcloud-cn/mcp-port-scanner). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.