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RichieMiller-HU

Ableton MCP Extended

set_track_color

Set the color of a track using a hex integer (0xRRGGBB) or an RGB list. Specify track index and color values.

Instructions

Set a track's color. Pass either an int 0xRRGGBB (e.g. 16711680 for red) or a [r, g, b] list with 0-255 values.

Parameters:

  • track_index: The index of the track

  • color: 0xRRGGBB int, or [r, g, b]

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
colorYes
track_indexYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations are provided, so the description must carry the full burden of behavioral disclosure. It only states the action (set color) without mentioning side effects, prerequisites, permissions, or what happens if the track is invalid. This is insufficient for a tool with no annotation support.

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 short, front-loaded with the action, and efficiently explains the color formats. No unnecessary words. However, it lacks structured sections like 'When to use' or 'Note', which could improve clarity without increasing length.

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?

Given the tool's simplicity (2 parameters, no nested objects, output schema exists), the description covers the basic usage. However, it omits behavioral context such as error handling, range validation, or effect on playback, which for a setter tool in a DAW context could be relevant.

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

Parameters3/5

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

With 0% schema description coverage, the description adds significant value by explaining the color parameter's format (0xRRGGBB int or [r,g,b] list). However, the track_index parameter is only minimally described as 'The index of the track', adding little beyond the schema. Overall, partial but meaningful addition.

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 the tool sets a track's color and specifies the two acceptable color formats (int or list). It uniquely distinguishes itself from sibling tools, as no other tool sets color.

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

Usage Guidelines3/5

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

The description explains how to use the tool (parameters) but provides no guidance on when to use it vs alternatives, or when not to use it. Since it's the only color setter, usage context is minimal but still lacking explicit direction.

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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