Terminates a background Ncat listener process.
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.
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.
Documented attack patterns abuse exactly the kind of access stop_ncat_listener gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Pentester-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for stop_ncat_listener:
{
"version": "1",
"default": "deny",
"tools": {
"stop_ncat_listener": {
"limits": [
{
"counter": "stop_ncat_listener_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}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.
Free to start. No card required.
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.
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.
stop_ncat_listener is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
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.
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.
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.
Start from Pentester-MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
337 Pentester-MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.