fullscreen_window · MacWright MCP: Risk & Policy

WHAT IT DOES

What fullscreen_window does on MacWright

AI agents invoke fullscreen_window to trigger actions in MacWright. 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 fullscreen_window needs a policy

This tool triggers an external UI operation (toggling fullscreen mode) on a macOS application window. It modifies the display state of a running application without permanently destroying data, making it an Execute-level action. Misuse could disrupt an agent's ability to interact with the UI or interfere with other running applications, warranting medium severity.

From the tool's definition Toggle fullscreen mode for an application

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fullscreen_window Rate-limited

fullscreen_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": {
    "fullscreen_window": {
      "limits": [
        {
          "counter": "fullscreen_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 MacWright, so you can run agents against it safely.

FAQ

Questions about fullscreen_window

What does the fullscreen_window tool do? +

Toggle fullscreen mode for an application. It is categorised as a Execute tool in the MacWright MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on fullscreen_window? +

Register the MacWright MCP server in PolicyLayer and add a rule for fullscreen_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 MacWright. Nothing to install.

What risk level is fullscreen_window? +

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

Can I rate-limit fullscreen_window? +

Yes. Add a rate_limit block to the fullscreen_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 fullscreen_window completely? +

Set action: deny in the PolicyLayer policy for fullscreen_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 fullscreen_window? +

fullscreen_window is provided by the MacWright MCP server (ruchit-p/macwright). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.