fl_select_one_channel

THE RISK

Medium Risk

Why fl_select_one_channel needs a policy

This tool modifies the selection state in FL Studio's channel rack by selecting one channel and deselecting all others. It's a reversible state change (Write), not destructive, and has a low blast radius since it only affects UI selection state.

From the tool's definition Select only one channel, deselecting all others

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

POLICY

How to control fl_select_one_channel

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_select_one_channel:

policy.json

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

fl_select_one_channel 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.

LIMIT THIS TOOL →

Free to start. No card required.

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_select_one_channel

What does the fl_select_one_channel tool do? +

Select only one channel, deselecting all others. 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_select_one_channel? +

Register the FL Studio MCP Server MCP server in PolicyLayer and add a rule for fl_select_one_channel: 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_select_one_channel? +

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

Can I rate-limit fl_select_one_channel? +

Yes. Add a rate_limit block to the fl_select_one_channel 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_select_one_channel completely? +

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

fl_select_one_channel 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.

CHECK YOUR STACK →