Assign an integer RGB color value to a track by its 0-indexed position to visually organize and distinguish tracks in an Ableton Live session.
Set color of a track using integer RGB color code.
| Name | Required | Description | Default |
|---|---|---|---|
| color | Yes | Integer RGB color value | |
| track_index | Yes | 0-indexed track position |
Changes observed during successful MCP inspections.
v1.0.0Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations at all, the description carries the full behavioral burden, and it says nothing about persistence, required session state, or what happens on an out-of-range index. The only behavioral hint is that it is a mutation, implied by "Set".
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
One short sentence with the action and format front-loaded and no filler. Nothing to trim.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
A simple two-parameter setter with full schema coverage and no output schema, so the core contract is covered. However, with zero annotations the description should still say whether the track must already exist or whether the color is RGB vs. a native color index — details an agent would need to call it correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so both parameters are already documented in the schema; the description only restates the color format ("integer RGB color code") without adding range, encoding, or indexing detail. Baseline 3 applies when the schema does the work.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
States a specific verb and resource ("Set color of a track"), which implicitly separates it from the similarly-named sibling set_clip_color. It does not explicitly name any alternative, so it stops short of a 5.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance on when to use this versus set_clip_color or the other set_track_* mutators, and no preconditions (e.g. track must exist, session must be live). Usage is only inferable from the name.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.