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Ableton MCP Extended

Ableton MCP Extended

by zabolotniydj
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

set_track_volume

Set the mixer fader volume for a track (1-based index) using a normalized scale: 0.0 for silence, 0.85 for unity gain (0 dB), and 1.0 for maximum (+6 dB).

Instructions

Set the mixer fader volume for a track directly.

This controls the actual track fader, not any device parameter.

Volume scale (normalized): 0.0 = silence 0.85 = 0 dB (unity gain, Ableton's default fader position) 1.0 = maximum (~+6 dB)

Parameters:

  • track_index: Track number (1-based). Return tracks come after session tracks.

  • volume: Normalized volume 0.0–1.0. Use 0.85 for unity (0 dB).

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "track_index": "<track_index>",
      "volume": "<volume>"
    },
    "name": "set_track_volume"
  }
}

Input Schema

NameRequiredDescriptionDefault
volumeYes
track_indexYes

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A4.2/5.0
Behavior3/5

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

With no annotations, the description should disclose behavioral traits. It clearly indicates the operation is a direct fader control, mentions the scale and default fader position, but does not disclose potential side effects, permissions, or reversibility. Since there is no annihilation, it is adequate but not exhaustive.

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

Conciseness4/5

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

The description is well-structured with a clear introduction, scale explanation, and parameter list. It is concise, but the parameter details are duplicated in the description since they are also in the schema, though the schema lacks descriptions. The structure is logical and front-loaded.

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

Completeness4/5

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

Given the tool has only 2 parameters but no annotation and an output schema, the description provides necessary details about the volume scale and track indexing, which are critical for correct usage. It could mention the output or return value, but the output schema likely covers that. It is complete for the tool's simplicity.

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

Parameters5/5

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

Schema coverage is 0%, so the description must explain both parameters in detail. It does: track_index is 1-based and clarifies return tracks position, and volume is normalized with specific values like 0.85 for unity. This fully compensates for lack of schema descriptions.

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

Purpose5/5

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

The description clearly states it sets the mixer fader volume for a track, distinguishing it from device parameters and sibling tools like set_track_panning or set_device_parameter. It specifies the action (set track volume) and resource (mixer fader).

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

Usage Guidelines4/5

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

The description provides context for when to use it (setting the actual track fader, not device parameters) and details the volume scale, including the unity gain value. However, it does not explicitly mention when not to use it or alternatives like set_send_level.

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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