stop_listening · Voice Loop MCP: Risk & Policy

WHAT IT DOES

What stop_listening does on Voice Loop MCP

AI agents invoke stop_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 stop_listening needs a policy

This tool executes a command that halts an ongoing autonomous operation (speech recognition) in a self-sustaining voice loop. While stopping a listener may seem reversible, in the context of a 'self-sustaining conversation loop,' interrupting it without user awareness could disrupt critical interactions or monitoring scenarios.

From the tool's definition Tool directly controls real-time speech recognition listener state; 'stop' indicates it triggers an external operation (halting an active macOS audio capture process) whose effects depend on the current system state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_listening Rate-limited

stop_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": {
    "stop_listening": {
      "limits": [
        {
          "counter": "stop_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 stop_listening

What does the stop_listening tool do? +

Stop the speech recognition listener. 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 stop_listening? +

Register the Voice Loop MCP server in PolicyLayer and add a rule for stop_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 stop_listening? +

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

Can I rate-limit stop_listening? +

Yes. Add a rate_limit block to the stop_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 stop_listening completely? +

Set action: deny in the PolicyLayer policy for stop_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 stop_listening? +

stop_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.