stop_ncat_listener

Terminates a background Ncat listener process.

SERVERPentester-MCP SOURCEhalilkirazkaya/pentester-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/halilkirazkaya-pentester-mcp/stop-ncat-listener.md

WHAT IT DOES

What stop_ncat_listener does on Pentester-MCP

AI agents invoke stop_ncat_listener to trigger actions in Pentester-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.

RISK

Why stop_ncat_listener is rated High

While the tool doesn't directly create/exfiltrate data (Read), modify persistent state (Write), or delete data (Destructive), it executes a system operation to terminate a network listener process. The blast radius is medium: misuse could disrupt legitimate network testing workflows or inadvertently halt security monitoring. It is not Financial.

From the tool's definition Tool 'stops' an Ncat listener process, performing process termination via IPC or signal operations. Ncat is a networking tool used in penetration testing for establishing connections and reverse shells.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs stop_ncat_listener safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Pentester-MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For stop_ncat_listener, this is the rule to start with:

stop_ncat_listener Rate-limited

stop_ncat_listener 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": {
    "stop_ncat_listener": {
      "limits": [
        {
          "counter": "stop_ncat_listener_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Pentester-MCP, apply this rule, and every stop_ncat_listener call is checked against it from then on.

FAQ

Questions about stop_ncat_listener

What does the stop_ncat_listener tool do? +

Terminates a background Ncat listener process. It is categorised as a Execute tool in the Pentester-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 stop_ncat_listener? +

Register the Pentester MCP server in PolicyLayer and add a rule for stop_ncat_listener: 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 Pentester-MCP. Nothing to install.

What risk level is stop_ncat_listener? +

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

Can I rate-limit stop_ncat_listener? +

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

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

stop_ncat_listener is provided by the Pentester MCP server (halilkirazkaya/pentester-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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