play_error_sound · MCP Make Sound MCP: Risk & Policy

WHAT IT DOES

What play_error_sound does on MCP Make Sound

AI agents invoke play_error_sound to trigger actions in MCP Make Sound. 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 play_error_sound needs a policy

This tool executes a system-level audio playback operation. It causes a side effect (playing a sound) on the host macOS system. While the blast radius is minimal (only produces an audible sound with no data modification or financial impact), it does trigger an external operation, placing it in the Execute category. Severity is low as misuse is largely harmless.

From the tool's definition "Play an error system sound" - triggers an external audio operation on the host system

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

play_error_sound Rate-limited

play_error_sound 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": {
    "play_error_sound": {
      "limits": [
        {
          "counter": "play_error_sound_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 MCP Make Sound, so you can run agents against it safely.

FAQ

Questions about play_error_sound

What does the play_error_sound tool do? +

Play an error system sound. It is categorised as a Execute tool in the MCP Make Sound MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on play_error_sound? +

Register the MCP Make Sound MCP server in PolicyLayer and add a rule for play_error_sound: 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 MCP Make Sound. Nothing to install.

What risk level is play_error_sound? +

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

Can I rate-limit play_error_sound? +

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

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

play_error_sound is provided by the MCP Make Sound MCP server (nocoo/mcp-make-sound). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.