speak · Voice Loop MCP: Risk & Policy

WHAT IT DOES

What speak does on Voice Loop MCP

AI agents invoke speak 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 speak needs a policy

This tool executes a speech synthesis operation that produces side effects in the physical world (audio output). While not reading data (Read) or modifying stored data (Write), it triggers an external system operation that cannot be fully undone once initiated.

From the tool's definition Tool named 'speak' on a voice conversation system that 'enables hands-free voice conversations with Claude using real-time speech recognition and text-to-speech.' The tool triggers audio output (text-to-speech) which executes an external operation (speaker…

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

speak Rate-limited

speak 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": {
    "speak": {
      "limits": [
        {
          "counter": "speak_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 speak

What does the speak tool do? +

speak. 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 speak? +

Register the Voice Loop MCP server in PolicyLayer and add a rule for speak: 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 speak? +

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

Can I rate-limit speak? +

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

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

speak 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.