AI agents invoke scan-ports to trigger actions in Nmap. 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.
Port scanning is an active network operation that sends packets to remote hosts to enumerate open ports. Even though the description is empty, the server context (Nmap wrapper for security assessments) and the tool name strongly imply it executes network scans against potentially external targets.
From the tool's definition Tool name 'scan-ports' on a server described as wrapping Nmap for 'automated network security assessments, including port scanning' — sibling tools confirm active scanning operations
Documented attack patterns abuse exactly the kind of access scan-ports gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Nmap, and nothing reaches the server without passing your rules. This is the rule we recommend for scan-ports:
{
"version": "1",
"default": "deny",
"tools": {
"scan-ports": {
"limits": [
{
"counter": "scan-ports_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}scan-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.
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scan-ports. It is categorised as a Execute tool in the Nmap MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Nmap MCP server in PolicyLayer and add a rule for scan-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 Nmap. Nothing to install.
scan-ports 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 scan-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.
Set action: deny in the PolicyLayer policy for scan-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.
scan-ports is provided by the Nmap MCP server (vorota-ai/nmap-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Nmap, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Nmap tools catalogued and risk-classified — across an index of 43,000+ MCP servers.