resize_window · MacWright MCP: Risk & Policy

WHAT IT DOES

What resize_window does on MacWright

AI agents use resize_window to create or update resources in MacWright — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MacWright environment.

WHY IT NEEDS A POLICY

Why resize_window needs a policy

This tool modifies the size and position of an application window. It is reversible (windows can be resized/moved back), so it falls under Write rather than Destructive. Misuse could disrupt workflow by moving or resizing windows unexpectedly, but the blast radius is limited to UI state changes.

From the tool's definition Resize and/or move a specific application

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

resize_window Rate-limited

resize_window stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "resize_window": {
      "limits": [
        {
          "counter": "resize_window_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 resize_window

What does the resize_window tool do? +

Resize and/or move a specific application. It is categorised as a Write tool in the MacWright MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on resize_window? +

Register the MacWright MCP server in PolicyLayer and add a rule for resize_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 resize_window? +

resize_window is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit resize_window? +

Yes. Add a rate_limit block to the resize_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 resize_window completely? +

Set action: deny in the PolicyLayer policy for resize_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 resize_window? +

resize_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.