send_nrpn · Patchwork Deepmind MCP: Risk & Policy

WHAT IT DOES

What send_nrpn does on Patchwork Deepmind

AI agents invoke send_nrpn to trigger actions in Patchwork Deepmind. 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_nrpn needs a policy

This tool sends raw MIDI NRPN messages to an external synthesizer, executing hardware-level parameter changes. It spans Write (modifies synth state) and Execute (triggers external operations on physical hardware via MIDI). Since it sends arbitrary raw NRPN messages and operates on external hardware, Execute is the most appropriate category.

From the tool's definition 'Send raw NRPN message to DeepMind 12' and 'programmatically change parameters by NRPN number' — triggers external MIDI operations on physical hardware

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_nrpn Rate-limited

send_nrpn 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_nrpn": {
      "limits": [
        {
          "counter": "send_nrpn_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 Patchwork Deepmind, so you can run agents against it safely.

FAQ

Questions about send_nrpn

What does the send_nrpn tool do? +

Send raw NRPN message to DeepMind 12. Use this to programmatically change parameters by NRPN number during discovery. It is categorised as a Execute tool in the Patchwork Deepmind 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_nrpn? +

Register the Patchwork Deepmind MCP server in PolicyLayer and add a rule for send_nrpn: 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 Patchwork Deepmind. Nothing to install.

What risk level is send_nrpn? +

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

Can I rate-limit send_nrpn? +

Yes. Add a rate_limit block to the send_nrpn 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_nrpn completely? +

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

send_nrpn is provided by the Patchwork Deepmind MCP server (truthanb/patchwork-deepmind). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.