osc_send · Ableton MCP: Risk & Policy

WHAT IT DOES

What osc_send does on Ableton MCP

AI agents invoke osc_send to trigger actions in Ableton MCP. 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 osc_send needs a policy

This tool sends arbitrary OSC (Open Sound Control) messages directly to Ableton Live. It is a low-level primitive that can trigger any operation supported by the OSC interface, including playback control, track manipulation, parameter changes, and more.

From the tool's definition OSCメッセージを直接送信し応答を確認（低レベル操作） — 'OSCメッセージを直接送信' means 'directly send OSC messages', described as a low-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

osc_send Rate-limited

osc_send 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": {
    "osc_send": {
      "limits": [
        {
          "counter": "osc_send_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 Ableton MCP, so you can run agents against it safely.

FAQ

Questions about osc_send

What does the osc_send tool do? +

OSCメッセージを直接送信し応答を確認（低レベル操作）. It is categorised as a Execute tool in the Ableton MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on osc_send? +

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

What risk level is osc_send? +

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

Can I rate-limit osc_send? +

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

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

osc_send is provided by the Ableton MCP server (keigotak/abletonmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.