mouse_move · Computer Use MCP Server MCP: Risk & Policy

WHAT IT DOES

What mouse_move does on Computer Use MCP Server

AI agents invoke mouse_move to trigger actions in Computer Use MCP Server. 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 mouse_move needs a policy

Moving the mouse cursor is an external desktop action that triggers a real interaction with the operating system. It has no direct read/write/destructive/financial effect by itself, but it is an execution of a system-level operation that can set up further actions.

From the tool's definition Move the mouse cursor to the specified screen coordinates (logical coordinates).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mouse_move Rate-limited

mouse_move 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": {
    "mouse_move": {
      "limits": [
        {
          "counter": "mouse_move_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 Computer Use MCP Server, so you can run agents against it safely.

FAQ

Questions about mouse_move

What does the mouse_move tool do? +

Move the mouse cursor to the specified screen coordinates (logical coordinates). It is categorised as a Execute tool in the Computer Use MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on mouse_move? +

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

What risk level is mouse_move? +

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

Can I rate-limit mouse_move? +

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

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

mouse_move is provided by the Computer Use MCP Server MCP server (syedazharmbnr1/computer-use-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.