play_music · Music MCP: Risk & Policy

WHAT IT DOES

What play_music does on Music

AI agents invoke play_music to trigger actions in Music. 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_music needs a policy

Playing music triggers an external operation on the system's audio output — it starts media playback, which is an action with real-world side effects (audio output, resource usage). This fits the Execute category as it triggers an external operation. Severity is medium since misuse could cause unwanted audio playback but has limited broader impact.

From the tool's definition Tool name 'play_music' and description '播放音乐' (play music), server description mentions 'playing songs with controls like play, pause, stop, and resume'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

play_music Rate-limited

play_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": {
    "play_music": {
      "limits": [
        {
          "counter": "play_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 Music, so you can run agents against it safely.

FAQ

Questions about play_music

What does the play_music tool do? +

播放音乐. It is categorised as a Execute tool in the Music 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_music? +

Register the Music MCP server in PolicyLayer and add a rule for play_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 Music. Nothing to install.

What risk level is play_music? +

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

Can I rate-limit play_music? +

Yes. Add a rate_limit block to the play_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 play_music completely? +

Set action: deny in the PolicyLayer policy for play_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 play_music? +

play_music is provided by the Music MCP server (jxiufen/music-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.