move_window · Mac MCP: Risk & Policy

WHAT IT DOES

What move_window does on Mac

AI agents invoke move_window to trigger actions in Mac. 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 move_window needs a policy

This tool triggers an external UI operation on macOS by repositioning application windows. It causes a side effect in the system (changing window position) that depends on the arguments provided. While not destructive or financial, it's more than a simple read/write — it executes a system-level UI action via AppleScript/JXA to manipulate window state.

From the tool's definition Moves a window to specified x, y coordinates

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

move_window Rate-limited

move_window 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": {
    "move_window": {
      "limits": [
        {
          "counter": "move_window_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 Mac, so you can run agents against it safely.

FAQ

Questions about move_window

What does the move_window tool do? +

Moves a window to specified x, y coordinates. It is categorised as a Execute tool in the Mac MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on move_window? +

Register the Mac MCP server in PolicyLayer and add a rule for move_window: 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 Mac. Nothing to install.

What risk level is move_window? +

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

Can I rate-limit move_window? +

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

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

move_window is provided by the Mac MCP server (laststance/mac-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.