desktop_click · Universal Dev MCP: Risk & Policy

WHAT IT DOES

What desktop_click does on Universal Dev MCP

AI agents invoke desktop_click to trigger actions in Universal Dev MCP. 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 desktop_click needs a policy

This tool simulates mouse clicks at arbitrary desktop coordinates via XTEST/XWayland, which is a low-level input injection mechanism. An AI agent could misuse this to interact with any on-screen element, including system dialogs, destructive buttons, or sensitive UI controls.

From the tool's definition 'Desktop par exact coordinates par click karo (XTEST/XWayland)' — executes a mouse click at arbitrary screen coordinates using XTEST/XWayland input injection

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

desktop_click Rate-limited

desktop_click 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": {
    "desktop_click": {
      "limits": [
        {
          "counter": "desktop_click_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 Universal Dev MCP, so you can run agents against it safely.

FAQ

Questions about desktop_click

What does the desktop_click tool do? +

Desktop par exact coordinates par click karo (XTEST/XWayland). It is categorised as a Execute tool in the Universal Dev MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on desktop_click? +

Register the Universal Dev MCP server in PolicyLayer and add a rule for desktop_click: 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 Universal Dev MCP. Nothing to install.

What risk level is desktop_click? +

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

Can I rate-limit desktop_click? +

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

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

desktop_click is provided by the Universal Dev MCP server (kallusuvaidyam/universal_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.