tap · Sl Test MCP: Risk & Policy

WHAT IT DOES

What tap does on Sl Test

AI agents invoke tap to trigger actions in Sl Test. 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 tap needs a policy

This tool simulates a tap/touch interaction at specific UI coordinates, triggering UI actions in a simulator or device. It executes an external operation (UI interaction) whose effects depend on the coordinates provided — it could activate buttons, navigate screens, or trigger any action available in the app UI. The description is truncated but clearly describes a UI automation action.

From the tool's definition Tap at specific coordinates

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tap Rate-limited

tap 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": {
    "tap": {
      "limits": [
        {
          "counter": "tap_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 Sl Test, so you can run agents against it safely.

FAQ

Questions about tap

What does the tap tool do? +

Tap at specific coordinates. Use describe_ui to get precise element coordinates (don. It is categorised as a Execute tool in the Sl Test 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? +

Register the Sl Test MCP server in PolicyLayer and add a rule for tap: 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 Sl Test. Nothing to install.

What risk level is tap? +

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

Can I rate-limit tap? +

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

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

tap is provided by the Sl Test MCP server (sampsonky/xcodebuildmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.