desktop_scroll

THE RISK

High Risk

Why desktop_scroll needs a policy

This tool performs a browser/desktop GUI action (scrolling) within a running desktop environment. It is an Execute-category action because it triggers an external operation (input event) in the Docker-based Ubuntu desktop. While scrolling itself is low-impact, it can be used as part of a chain of GUI automation steps.

From the tool's definition Scroll at (x,y) — triggers a GUI interaction (scroll action) in a live Ubuntu desktop environment inside Docker

Documented attack patterns abuse exactly the kind of access desktop_scroll gives an agent:

POLICY

How to control desktop_scroll

PolicyLayer is an MCP gateway — it sits between your AI agents and Taw Computer, and nothing reaches the server without passing your rules. This is the rule we recommend for desktop_scroll:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "desktop_scroll": {
      "limits": [
        {
          "counter": "desktop_scroll_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

desktop_scroll 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.

Create a free account and register Taw Computer — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in Taw Computer → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about desktop_scroll

What does the desktop_scroll tool do? +

Scroll at (x,y). It is categorised as a Execute tool in the Taw Computer 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_scroll? +

Register the Taw Computer MCP server in PolicyLayer and add a rule for desktop_scroll: 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 Taw Computer. Nothing to install.

What risk level is desktop_scroll? +

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

Can I rate-limit desktop_scroll? +

Yes. Add a rate_limit block to the desktop_scroll 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_scroll completely? +

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

desktop_scroll is provided by the Taw Computer MCP server (tawgroup/taw-computer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Taw Computer tool call.

Start from Taw Computer, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →