mute_track · FluidSynth MCP Server MCP: Risk & Policy

WHAT IT DOES

What mute_track does on FluidSynth MCP Server

AI agents use mute_track to create or update resources in FluidSynth MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FluidSynth MCP Server environment.

WHY IT NEEDS A POLICY

Why mute_track needs a policy

Muting a track modifies its audio output state but is fully reversible (the track can be unmuted). This is a write operation that changes project metadata without deleting data or executing arbitrary code. Blast radius is minimal—affects only the current project's track configuration.

From the tool's definition Tool name 'mute_track' and description 'Mute a track in the specified project' indicate a reversible modification to track state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mute_track Rate-limited

mute_track stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "mute_track": {
      "limits": [
        {
          "counter": "mute_track_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches FluidSynth MCP Server, so you can run agents against it safely.

FAQ

Questions about mute_track

What does the mute_track tool do? +

Mute a track in the specified project. It is categorised as a Write tool in the FluidSynth MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mute_track? +

Register the FluidSynth MCP Server MCP server in PolicyLayer and add a rule for mute_track: 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 FluidSynth MCP Server. Nothing to install.

What risk level is mute_track? +

mute_track is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit mute_track? +

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

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

mute_track is provided by the FluidSynth MCP Server MCP server (kimjune01/synth-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.