directCmd · Linux Network Scanner MCP Server MCP

WHAT IT DOES

What directCmd does on Linux Network Scanner MCP Server

AI agents invoke directCmd to trigger actions in Linux Network Scanner 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 directCmd needs a policy

This tool executes arbitrary system commands without filtering or validation. An AI agent could use this to run malicious commands, exfiltrate data, modify system configurations, or pivot to other systems. The 'direct' nature and Popen.communicate indicate full OS-level command execution.

From the tool's definition Tool description states 'Run a direct command via blocking Popen.communicate' - this directly executes arbitrary commands with no inherent restrictions. The name 'directCmd' combined with Popen usage indicates shell command execution capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

directCmd Rate-limited

directCmd 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": {
    "directCmd": {
      "limits": [
        {
          "counter": "directcmd_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 Linux Network Scanner MCP Server, so you can run agents against it safely.

FAQ

Questions about directCmd

What does the directCmd tool do? +

Run a direct command via blocking Popen.communicate and return structured JSON. It is categorised as a Execute tool in the Linux Network Scanner 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 directCmd? +

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

What risk level is directCmd? +

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

Can I rate-limit directCmd? +

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

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

directCmd is provided by the Linux Network Scanner MCP Server MCP server (nibesh0/netsecmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.