stop_music · Claude DJ MCP: Risk & Policy

WHAT IT DOES

What stop_music does on Claude DJ MCP

AI agents invoke stop_music to trigger actions in Claude DJ 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_music needs a policy

This tool executes a command that controls an external system (Strudel music player). While the effect is reversible (music can be restarted), it is an action that triggers a state change in an external process rather than reading or writing persistent data. The blast radius is very low—stopping music in a DJ context causes temporary interruption but no data loss or financial impact.

From the tool's definition Tool name is 'stop_music' and description states it will 'Stop the currently playing Strudel pattern,' indicating it triggers an external operation (halting music playback) whose effect depends on the current state of the music system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_music Rate-limited

stop_music 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_music": {
      "limits": [
        {
          "counter": "stop_music_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 Claude DJ MCP, so you can run agents against it safely.

FAQ

Questions about stop_music

What does the stop_music tool do? +

Stop the currently playing Strudel pattern. It is categorised as a Execute tool in the Claude DJ 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_music? +

Register the Claude DJ MCP server in PolicyLayer and add a rule for stop_music: 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 Claude DJ MCP. Nothing to install.

What risk level is stop_music? +

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

Can I rate-limit stop_music? +

Yes. Add a rate_limit block to the stop_music 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_music completely? +

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

stop_music is provided by the Claude DJ MCP server (uetuluk/claude-dj-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.