perform-w3c-gesture

THE RISK

High Risk

This tool executes touch gesture actions on a mobile device via the W3C Actions API. It triggers external operations (physical/virtual touch interactions) whose effects depend on the arguments passed (e.g., swipe, tap, drag). The effects are generally reversible in the sense that no data is permanently deleted, but it can trigger arbitrary UI interactions on a device, giving it a medium blast radius.

From the tool's definition Perform touch gestures using the W3C Actions API

Documented attack patterns abuse exactly the kind of access perform-w3c-gesture gives an agent:

HOW TO CONTROL PERFORM-W3C-GESTURE

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Appium Server, and nothing reaches the server without passing your rules. This is the rule we recommend for perform-w3c-gesture:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "perform-w3c-gesture": {
      "limits": [
        {
          "counter": "perform-w3c-gesture_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

perform-w3c-gesture 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 MCP Appium Server — 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 MCP Appium Server → 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.
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FAQ

What does the perform-w3c-gesture tool do? +

Perform touch gestures using the W3C Actions API (more reliable than TouchAction API). It is categorised as a Execute tool in the MCP Appium 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 perform-w3c-gesture? +

Register the MCP Appium Server MCP server in PolicyLayer and add a rule for perform-w3c-gesture: 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 MCP Appium Server. Nothing to install.

What risk level is perform-w3c-gesture? +

perform-w3c-gesture is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit perform-w3c-gesture? +

Yes. Add a rate_limit block to the perform-w3c-gesture 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 perform-w3c-gesture completely? +

Set action: deny in the PolicyLayer policy for perform-w3c-gesture. 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 perform-w3c-gesture? +

perform-w3c-gesture is provided by the MCP Appium Server MCP server (rahulec08/appium-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Appium Server tool call.

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// WHAT PERFORM-W3C-GESTURE ON MCP APPIUM SERVER DOES

// THE RISK

// HOW TO CONTROL PERFORM-W3C-GESTURE

// EXPLORE