music · Reviewer MCP: Risk & Policy

WHAT IT DOES

What music does on Reviewer MCP

AI agents invoke music to trigger actions in Reviewer 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 music needs a policy

This tool executes commands against Spotify to control playback, which could include play, pause, skip, or queue manipulation. While the impact is limited to music playback and poses no data loss or financial risk, it represents a capability to trigger external service operations.

From the tool's definition Tool name 'music' with description 'Control Spotify for background music' indicates execution of external operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

music Rate-limited

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": {
    "music": {
      "limits": [
        {
          "counter": "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 Reviewer MCP, so you can run agents against it safely.

FAQ

Questions about music

What does the music tool do? +

Control Spotify for background music (macOS only). It is categorised as a Execute tool in the Reviewer 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 music? +

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

What risk level is music? +

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

Can I rate-limit music? +

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

Set action: deny in the PolicyLayer policy for 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 music? +

music is provided by the Reviewer MCP server (jaggederest/mcp_reviewer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.