system · Windows Computer Use MCP: Risk & Policy

WHAT IT DOES

What system does on Windows Computer Use

AI agents invoke system to trigger actions in Windows Computer Use. 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 system needs a policy

The server context strongly implies this tool interacts with the Windows system at a low level. 'system' is a common name for executing system-level commands or queries. Given the server's capabilities (low-level input injection, full desktop control), this tool likely executes system commands or retrieves system information.

From the tool's definition Tool name 'system' on a server described as enabling 'full control of a Windows desktop with native screen capture, low-level input injection, game-grade input, and play-testing capabilities.' The tool description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

system Rate-limited

system 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": {
    "system": {
      "limits": [
        {
          "counter": "system_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 Computer Use, so you can run agents against it safely.

FAQ

Questions about system

What does the system tool do? +

system. It is categorised as a Execute tool in the Windows Computer Use MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on system? +

Register the Windows Computer Use MCP server in PolicyLayer and add a rule for system: 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 Computer Use. Nothing to install.

What risk level is system? +

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

Can I rate-limit system? +

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

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

system is provided by the Windows Computer Use MCP server (sshh12/windows-computer-use-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.