fl_set_stereo_separation

THE RISK

Medium Risk

Why fl_set_stereo_separation needs a policy

Setting stereo separation adjusts mixer track properties, which modifies project state reversibly. This is not destructive (the change can be undone), not an execution of arbitrary code, and not financial. It fits Write category as it creates or modifies data reversibly. Severity is medium because misuse could corrupt or degrade an audio project's mixing configuration, but changes remain undoable.

From the tool's definition Tool modifies mixer track stereo separation parameter. Description states 'Set the stereo separation' which is an irreversible parameter change to audio mixing state.

Documented attack patterns abuse exactly the kind of access fl_set_stereo_separation gives an agent:

POLICY

How to control fl_set_stereo_separation

PolicyLayer is an MCP gateway — it sits between your AI agents and FL Studio MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for fl_set_stereo_separation:

policy.json

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

fl_set_stereo_separation 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.

Create a free account and register FL Studio MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about fl_set_stereo_separation

What does the fl_set_stereo_separation tool do? +

Set the stereo separation of a mixer track. It is categorised as a Write tool in the FL Studio 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 fl_set_stereo_separation? +

Register the FL Studio MCP Server MCP server in PolicyLayer and add a rule for fl_set_stereo_separation: 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 FL Studio MCP Server. Nothing to install.

What risk level is fl_set_stereo_separation? +

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

Can I rate-limit fl_set_stereo_separation? +

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

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

fl_set_stereo_separation is provided by the FL Studio MCP Server MCP server (karl-andres/fl-studio-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every FL Studio MCP Server tool call.

Start from FL Studio MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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