stop_clip · Ableton MCP Extended MCP: Risk & Policy

WHAT IT DOES

What stop_clip does on Ableton MCP Extended

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

This tool executes a command that controls Ableton Live's playback state. While the operation is reversible (stopping playback can be undone by resuming), it constitutes an Execute action because it actively triggers a system operation rather than merely reading data.

From the tool's definition Tool name 'stop_clip' and description 'Stop playing a clip' directly indicate triggering an action (stopping playback) in Ableton Live. This is an external operation whose effects depend on which clip is targeted.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stop_clip Rate-limited

stop_clip 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": {
    "stop_clip": {
      "limits": [
        {
          "counter": "stop_clip_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 Extended, so you can run agents against it safely.

FAQ

Questions about stop_clip

What does the stop_clip tool do? +

Stop playing a clip. It is categorised as a Execute tool in the Ableton MCP Extended MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stop_clip? +

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

What risk level is stop_clip? +

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

Can I rate-limit stop_clip? +

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

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

stop_clip is provided by the Ableton MCP Extended MCP server (kevinzhang03/ableton-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.