create_song_sketch · Scythe MCP REAPER MCP: Risk & Policy

WHAT IT DOES

What create_song_sketch does on Scythe MCP REAPER

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

WHY IT NEEDS A POLICY

Why create_song_sketch needs a policy

This tool generates and creates a full song sketch with multiple tracks/parts in the REAPER DAW. It creates new data (MIDI items, tracks) reversibly — the user can delete or undo the generated content. It is analogous to a multi-step write/create operation.

From the tool's definition Generate a full song sketch (Drums, Bass, Harmony, Melody)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_song_sketch Rate-limited

create_song_sketch 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": {
    "create_song_sketch": {
      "limits": [
        {
          "counter": "create_song_sketch_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 Scythe MCP REAPER, so you can run agents against it safely.

FAQ

Questions about create_song_sketch

What does the create_song_sketch tool do? +

Generate a full song sketch (Drums, Bass, Harmony, Melody). It is categorised as a Write tool in the Scythe MCP REAPER MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_song_sketch? +

Register the Scythe MCP REAPER MCP server in PolicyLayer and add a rule for create_song_sketch: 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 Scythe MCP REAPER. Nothing to install.

What risk level is create_song_sketch? +

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

Can I rate-limit create_song_sketch? +

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

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

create_song_sketch is provided by the Scythe MCP REAPER MCP server (yura9011/scythe_mcp_reaper). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.