tap-by-ios-predicate

THE RISK

High Risk

This tool performs a UI interaction (tap/click) on a mobile device element, triggering external operations on the device. The effect depends on which element is tapped — it could open apps, submit forms, confirm dialogs, etc. This is an Execute-level action as it triggers device-side operations whose consequences depend on the argument.

From the tool's definition Tap on an element using iOS predicate string (iOS only)

Documented attack patterns abuse exactly the kind of access tap-by-ios-predicate gives an agent:

HOW TO CONTROL TAP-BY-IOS-PREDICATE

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 tap-by-ios-predicate:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "tap-by-ios-predicate": {
      "limits": [
        {
          "counter": "tap-by-ios-predicate_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

tap-by-ios-predicate 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.
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FAQ

What does the tap-by-ios-predicate tool do? +

Tap on an element using iOS predicate string (iOS only). 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 tap-by-ios-predicate? +

Register the MCP Appium Server MCP server in PolicyLayer and add a rule for tap-by-ios-predicate: 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 tap-by-ios-predicate? +

tap-by-ios-predicate is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit tap-by-ios-predicate? +

Yes. Add a rate_limit block to the tap-by-ios-predicate 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 tap-by-ios-predicate completely? +

Set action: deny in the PolicyLayer policy for tap-by-ios-predicate. 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 tap-by-ios-predicate? +

tap-by-ios-predicate 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 TAP-BY-IOS-PREDICATE ON MCP APPIUM SERVER DOES

// THE RISK

// HOW TO CONTROL TAP-BY-IOS-PREDICATE

// EXPLORE