firewall_add · Windows Operations MCP: Risk & Policy

WHAT IT DOES

What firewall_add does on Windows Operations MCP

AI agents invoke firewall_add to trigger actions in Windows Operations 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.

WHY IT NEEDS A POLICY

Why firewall_add needs a policy

The tool name 'firewall_add' strongly implies it adds firewall rules to the Windows Firewall, which modifies system security configuration. This is an Execute/Write operation that could have significant security implications — an AI agent misusing this could open dangerous ports or allow malicious traffic.

From the tool's definition Tool name 'firewall_add' on a Windows system management server that includes network and security operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

firewall_add Rate-limited

firewall_add 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": {
    "firewall_add": {
      "limits": [
        {
          "counter": "firewall_add_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 Windows Operations MCP, so you can run agents against it safely.

FAQ

Questions about firewall_add

What does the firewall_add tool do? +

firewall_add. It is categorised as a Execute tool in the Windows Operations 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 firewall_add? +

Register the Windows Operations MCP server in PolicyLayer and add a rule for firewall_add: 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 Windows Operations MCP. Nothing to install.

What risk level is firewall_add? +

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

Can I rate-limit firewall_add? +

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

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

firewall_add is provided by the Windows Operations MCP server (sandraschi/windows-operations-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.