insert_midi_notes · Orpheus MCP: Risk & Policy

WHAT IT DOES

What insert_midi_notes does on Orpheus

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

WHY IT NEEDS A POLICY

Why insert_midi_notes needs a policy

The tool creates or adds MIDI note data to a music project—a Write operation. It is reversible (notes can be deleted or edited), so it does not qualify as Destructive. The severity is high because an AI agent inserting arbitrary MIDI notes could substantially alter a user's musical work, corrupt compositional intent, or create unusable results.

From the tool's definition Tool name 'insert_midi_notes' indicates creation of MIDI data in a REAPER project. Sibling tools like 'apply_changes', 'apply_mix_balance', and 'apply_master_match' establish that this server modifies audio projects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

insert_midi_notes Rate-limited

insert_midi_notes 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": {
    "insert_midi_notes": {
      "limits": [
        {
          "counter": "insert_midi_notes_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 Orpheus, so you can run agents against it safely.

FAQ

Questions about insert_midi_notes

What does the insert_midi_notes tool do? +

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

How do I enforce a policy on insert_midi_notes? +

Register the Orpheus MCP server in PolicyLayer and add a rule for insert_midi_notes: 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 Orpheus. Nothing to install.

What risk level is insert_midi_notes? +

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

Can I rate-limit insert_midi_notes? +

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

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

insert_midi_notes is provided by the Orpheus MCP server (mal0ware/orpheus). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.