start_listening · Voice Loop MCP: Risk & Policy

WHAT IT DOES

What start_listening does on Voice Loop MCP

AI agents invoke start_listening to trigger actions in Voice Loop MCP. 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 start_listening needs a policy

This tool initiates real-time speech recognition and listening operations on a user's macOS system. While not destructive or financial, it executes an external operation that activates hardware/software systems and initiates an autonomous interaction loop. The lack of a description increases ambiguity but the context strongly suggests code/command execution for audio capture.

From the tool's definition Tool named 'start_listening' with no description; sibling tools include 'read_speech' and 'speak', indicating this activates real-time speech recognition and audio capture.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_listening Rate-limited

start_listening 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": {
    "start_listening": {
      "limits": [
        {
          "counter": "start_listening_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 Voice Loop MCP, so you can run agents against it safely.

FAQ

Questions about start_listening

What does the start_listening tool do? +

start_listening. It is categorised as a Execute tool in the Voice Loop MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_listening? +

Register the Voice Loop MCP server in PolicyLayer and add a rule for start_listening: 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 Voice Loop MCP. Nothing to install.

What risk level is start_listening? +

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

Can I rate-limit start_listening? +

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

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

start_listening is provided by the Voice Loop MCP server (theonlypal/voice-loop-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.