send_note_on · Sushi MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_note_on does on Sushi MCP Server

AI agents invoke send_note_on to trigger actions in Sushi MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why send_note_on needs a policy

This tool triggers an external real-time audio operation — sending a MIDI note-on event to a track in the Sushi audio engine. It causes an immediate audible/functional effect in the audio system. It doesn't read data, write persistent state, or delete anything, but it executes an action on an external audio system whose effects depend on the arguments (track, note, velocity, etc.).

From the tool's definition Send a MIDI note-on message to a track

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_note_on Rate-limited

send_note_on stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_note_on": {
      "limits": [
        {
          "counter": "send_note_on_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about send_note_on

What does the send_note_on tool do? +

Send a MIDI note-on message to a track. It is categorised as a Execute tool in the Sushi MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on send_note_on? +

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

What risk level is send_note_on? +

send_note_on is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit send_note_on? +

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

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

send_note_on is provided by the Sushi MCP Server MCP server (nagarjun226/sushi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.