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FreeRiverHouse

AbletonMCP

by FreeRiverHouse
OverviewSchemaRelated ServersScoreDiscussions
Python
Local

start_playback

Begin playback of the current Ableton Live session to start music production or continue working on tracks.

Instructions

Start playing the Ableton session.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • MCP_Server/server.py:416-420 (handler)
    The MCP tool handler function 'start_playback' that triggers playback in the Ableton session via _run.
    def start_playback(ctx: Context) -> str:
    """Start playing the Ableton session."""
    try:
        _run("start_playback")
        return "Started playback"
  • AbletonMCP_Remote_Script/__init__.py:616-620 (handler)
    The actual Ableton Remote Script method that interacts with the Ableton Live Object Model to start playback.
    def _start_playback(self):
    """Start playing the session"""
    try:
        self._song.start_playing()

Tool Definition Quality

B3.1/5.0
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 but offers minimal information. It doesn't specify what 'playing' entails (e.g., from current position, from start), whether it requires specific session states, or what happens on success/failure. This leaves critical behavioral traits unclear.

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, direct sentence with zero wasted words, making it highly concise and front-loaded. It efficiently communicates the core action without unnecessary elaboration.

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

Completeness2/5

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

Given the complexity of a playback control tool with no annotations and no output schema, the description is insufficient. It lacks details on behavior, side effects, return values, or error conditions, leaving the agent with significant gaps in understanding how to use it effectively.

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 0 parameters, and schema description coverage is 100%, so no parameter documentation is needed. The description appropriately doesn't discuss parameters, focusing solely on the tool's action, which aligns with the empty input schema.

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 ('Start playing') and the target resource ('the Ableton session'), making the purpose immediately understandable. However, it doesn't differentiate from its sibling tool 'stop_playback' beyond the obvious verb difference, missing an opportunity to clarify scope or behavior distinctions.

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 on when to use this tool versus alternatives like 'fire_clip' or 'stop_playback', nor does it mention prerequisites (e.g., whether a session must be loaded). The description only states what it does, not when it should be used.

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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