modify_mood · Ableton MCP: Risk & Policy

WHAT IT DOES

What modify_mood does on Ableton MCP

AI agents use modify_mood to create or update resources in Ableton MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ableton MCP environment.

WHY IT NEEDS A POLICY

Why modify_mood needs a policy

This tool modifies musical properties of a song in Ableton Live, changing its mood characteristics. This is a reversible modification (Write) to existing arrangement data. It does not execute code, delete data, or involve financial transactions. Severity is medium as misuse could alter an entire song arrangement's emotional character, but changes are likely reversible.

From the tool's definition 'modify_mood' — modifies the mood/atmosphere of a song (dark, bright, aggressive, chill, epic, minimal)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

modify_mood Rate-limited

modify_mood stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "modify_mood": {
      "limits": [
        {
          "counter": "modify_mood_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 modify_mood

What does the modify_mood tool do? +

曲の雰囲気を変更（dark, bright, aggressive, chill, epic, minimal）. It is categorised as a Write tool in the Ableton MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on modify_mood? +

Register the Ableton MCP server in PolicyLayer and add a rule for modify_mood: 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 modify_mood? +

modify_mood is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit modify_mood? +

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

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

modify_mood 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.