send_midi_cc · FM8 MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_midi_cc does on FM8 MCP Server

AI agents invoke send_midi_cc to trigger actions in FM8 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_midi_cc needs a policy

This tool triggers an external operation — sending a MIDI CC message to a hardware/software synthesizer. It doesn't merely read or write stored data; it actively controls an external device (FM8) by transmitting real-time control signals. The blast radius is medium: misuse could cause unintended sound changes or disrupt a live performance, but it doesn't delete data or involve financial transactions.

From the tool's definition Send a raw MIDI CC (Control Change) message to FM8. CC numbers range from 0-127, values from 0-127.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_midi_cc Rate-limited

send_midi_cc 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_midi_cc": {
      "limits": [
        {
          "counter": "send_midi_cc_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 FM8 MCP Server, so you can run agents against it safely.

FAQ

Questions about send_midi_cc

What does the send_midi_cc tool do? +

Send a raw MIDI CC (Control Change) message to FM8. CC numbers range from 0-127, values from 0-127. It is categorised as a Execute tool in the FM8 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_midi_cc? +

Register the FM8 MCP Server MCP server in PolicyLayer and add a rule for send_midi_cc: 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 FM8 MCP Server. Nothing to install.

What risk level is send_midi_cc? +

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

Can I rate-limit send_midi_cc? +

Yes. Add a rate_limit block to the send_midi_cc 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_midi_cc completely? +

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

send_midi_cc is provided by the FM8 MCP Server MCP server (thesigma1receptor/fm8mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.