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selection_set_loop

Define loop start and end points in REAPER by specifying time in seconds for precise playback looping.

Instructions

Set loop points.

Args: start: Start seconds. end: End seconds.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
startYes
endYes
Behavior2/5

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

No annotations provided. The description only states 'Set loop points' and parameter units, but does not disclose side effects (e.g., whether it clears any existing loop, if it affects playback, or any constraints like start < end).

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 very concise (3 short sentences) and front-loaded. However, it may be too brief, lacking context that could be added without bloat.

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?

For a tool with no annotations and no output schema, the description is incomplete. It does not define what loop points are, how they relate to time selection, or any behavioral details necessary for correct invocation.

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

Parameters2/5

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

With 0% schema description coverage, the description adds minimal meaning: it clarifies that both parameters are in seconds. However, it does not specify valid ranges, constraints, or behavior when values are out of bounds.

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 name 'selection_set_loop' and description 'Set loop points' clearly indicate the tool sets loop points. Among siblings like 'selection_set_time', this is distinct as it specifically targets loop points, not time selection.

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 on when to use this tool versus alternatives (e.g., 'selection_set_time' or 'transport_set_position'). No prerequisites, conditions, or exclusions mentioned.

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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