get_fingerprint · Android MCP Server MCP: Risk & Policy

WHAT IT DOES

What get_fingerprint does on Android MCP Server

AI agents invoke get_fingerprint to trigger actions in Android MCP Server. 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 get_fingerprint needs a policy

This tool triggers an external operation on the Android device — displaying a fingerprint authentication prompt. It doesn't merely read data; it actively initiates a system-level authentication dialog that interacts with hardware sensors and security subsystems.

From the tool's definition Prompt for fingerprint authentication

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

get_fingerprint Rate-limited

get_fingerprint 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": {
    "get_fingerprint": {
      "limits": [
        {
          "counter": "get_fingerprint_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 Android MCP Server, so you can run agents against it safely.

FAQ

Questions about get_fingerprint

What does the get_fingerprint tool do? +

Prompt for fingerprint authentication. It is categorised as a Execute tool in the Android MCP 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 get_fingerprint? +

Register the Android MCP Server MCP server in PolicyLayer and add a rule for get_fingerprint: 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 Android MCP Server. Nothing to install.

What risk level is get_fingerprint? +

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

Can I rate-limit get_fingerprint? +

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

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

get_fingerprint is provided by the Android MCP Server MCP server (wujie272/android-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.