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FreeRiverHouse

AbletonMCP

by FreeRiverHouse
OverviewSchemaRelated ServersScoreDiscussions
Python
Local

stop_playback

Stop playing the Ableton Live session to pause music production or editing work. This command halts playback through the MCP server interface.

Instructions

Stop playing the Ableton session.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • MCP_Server/server.py:425-430 (handler)
    The MCP tool handler for 'stop_playback' that calls the remote script command.
    @mcp.tool()
def stop_playback(ctx: Context) -> str:
    """Stop playing the Ableton session."""
    try:
        _run("stop_playback")
        return "Stopped playback"
  • AbletonMCP_Remote_Script/__init__.py:629-633 (handler)
    The actual implementation of the stop playback logic within the Ableton Remote Script.
    def _stop_playback(self):
    """Stop playing the session"""
    try:
        self._song.stop_playing()

Tool Definition Quality

B3.2/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries full burden for behavioral disclosure. It states what the tool does but doesn't describe side effects (e.g., whether it resets playback position, affects other session state), error conditions, or what happens if playback isn't active. This is a significant gap for a mutation tool with zero annotation coverage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, clear sentence with zero wasted words. It's front-loaded with the core action and resource, making it immediately understandable without unnecessary elaboration.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-parameter tool with no output schema, the description is minimally adequate. However, as a mutation tool with no annotations, it should ideally disclose more about behavioral aspects like side effects or error handling. The description covers the basic action but leaves important contextual gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has zero parameters, and schema description coverage is 100% (empty schema). The description doesn't need to explain parameters, so it meets the baseline expectation. No additional parameter information is required or possible.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Stop playing') and the target resource ('the Ableton session'), making the purpose immediately understandable. It doesn't explicitly differentiate from sibling tools like 'stop_clip' or 'start_playback', but the verb+resource combination is specific enough for basic understanding.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided about when to use this tool versus alternatives. While the name implies it stops playback, there's no mention of prerequisites (e.g., requires playback to be active), exclusions, or how it relates to sibling tools like 'stop_clip' or 'start_playback'.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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