send_by_route · FM8 MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_by_route does on FM8 MCP Server

AI agents invoke send_by_route 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_by_route needs a policy

This tool triggers external operations by sending MIDI CC messages to control FM8 synthesizer routing parameters. It causes real-time state changes in external hardware/software (the FM8 synthesizer), making it an Execute-category action. Misuse could result in unintended sound design changes but has limited blast radius beyond audio output disruption.

From the tool's definition Send a FM8 matrix route like A->B with a value (0-127)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_by_route Rate-limited

send_by_route 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_by_route": {
      "limits": [
        {
          "counter": "send_by_route_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_by_route

What does the send_by_route tool do? +

Send a FM8 matrix route like A->B with a value (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_by_route? +

Register the FM8 MCP Server MCP server in PolicyLayer and add a rule for send_by_route: 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_by_route? +

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

Can I rate-limit send_by_route? +

Yes. Add a rate_limit block to the send_by_route 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_by_route completely? +

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

send_by_route 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.