adb_start_app · LocalAnt MCP: Risk & Policy

WHAT IT DOES

What adb_start_app does on LocalAnt

AI agents invoke adb_start_app to trigger actions in LocalAnt. 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 adb_start_app needs a policy

adb_start_app launches applications, which is an Execute action — it runs code/processes whose behavior and side effects depend entirely on which app is started and its current state.

From the tool's definition Tool description states 'Start an app by package/activity' — this directly triggers application execution on an Android device via ADB (Android Debug Bridge).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

adb_start_app Rate-limited

adb_start_app 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": {
    "adb_start_app": {
      "limits": [
        {
          "counter": "adb_start_app_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 LocalAnt, so you can run agents against it safely.

FAQ

Questions about adb_start_app

What does the adb_start_app tool do? +

Start an app by package/activity. It is categorised as a Execute tool in the LocalAnt MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on adb_start_app? +

Register the LocalAnt MCP server in PolicyLayer and add a rule for adb_start_app: 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 LocalAnt. Nothing to install.

What risk level is adb_start_app? +

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

Can I rate-limit adb_start_app? +

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

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

adb_start_app is provided by the LocalAnt MCP server (yuga-hashimoto/localant). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.