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set_track_color

Set a track's color in REAPER by providing its index and RGB values (0–255) for visual organization of projects.

Instructions

Set track color using RGB values (0–255 each).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
track_indexYes
rYes
gYes
bYes
Behavior2/5

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

The description does not reveal behavioral details beyond the basic mutation. It omits what happens on invalid input, whether the change is reversible, or any side effects. With no annotations provided, the description carries full responsibility for disclosing behavior, which it fails to do.

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 sentence that is highly concise and front-loaded with the core action, wasting no words. Every part is necessary.

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?

The description does not state what the tool returns or what happens on success/error. Given the absence of an output schema, this information is missing. While the tool is simple, a complete description would at least hint at the result (e.g., 'returns the updated track color').

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?

The description adds meaning to three parameters (r, g, b) by specifying their valid range (0–255). However, the track_index parameter is left unexplained, and schema coverage is 0%, so the description only partially compensates for the 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 precisely states the action ('Set') and resource ('track color'), and clarifies the input format with RGB value ranges. It clearly distinguishes from sibling tools like set_track_volume or set_track_pan, which serve different purposes.

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, such as other track modification tools. The description does not mention prerequisites, typical use cases, or when not to use it.

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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