REAPER MCP Server

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

With no annotations provided, the description carries the full burden of behavioral disclosure but fails to mention crucial side effects: that soloing a track typically mutes all other tracks during playback, or whether multiple tracks can be soloed simultaneously. It does not indicate if the operation is reversible or if it affects the project state destructively.

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?

The description is extremely brief at five words with zero redundancy. While efficient, it borders on under-specification for a tool with behavioral complexity. However, every word earns its place and the core action is front-loaded.

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?

For a DAW operation affecting playback state with two required parameters and no output schema, the description is insufficient. It omits expected behavior (interaction with other tracks), parameter details (indexing scheme), and return value expectations. The lack of annotations exacerbates the incompleteness.

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?

Given 0% schema description coverage, the description inadequately compensates for the undocumented parameters. While 'solo or unsolo' implies the boolean 'soloed' parameter semantics, it does not clarify that 'track_index' expects a zero-based integer, valid ranges, or what constitutes the 'soloed' state (true/false mapping). Additional parameter context is essential when schemas lack descriptions.

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?

The description states the basic action (solo/unsolo) and target resource (track), but fails to explain what 'solo' means in a DAW context (isolating a track by muting others) or how it differs from the sibling 'set_track_mute' tool. It meets the minimum bar of identifying the operation but lacks the specificity needed to distinguish its behavioral impact.

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 is provided on when to use this tool versus alternatives like 'set_track_mute', nor are prerequisites mentioned (e.g., track must exist). The description offers no 'when-to-use' or 'when-not-to-use' context despite the existence of closely related sibling tools.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.