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mcp_opendaw_transpose_notes

Transpose MIDI notes up or down by a number of semitones. Specify audio unit, track, and region to apply the transposition.

Instructions

Transpose all notes by a number of semitones.

semitones: Positive = up, negative = down (e.g. +12 = octave up, -5 = perfect fourth down). unit_index: Audio unit index (-1 = all AUs with note tracks). track_index: Specific note track (-1 = all note tracks on the AU). region_index: Specific region index (-1 = all regions on the track).

Returns count of notes transposed and notes skipped (out of MIDI range 0-127).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
semitonesYes
unit_indexYes
track_indexYes
region_indexNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

With no annotations, the description partially covers behavior: returns count of transposed/skipped notes, scopes via -1 values. However, it omits side effects, authorization, or performance implications. For a mutation tool, more detail would be beneficial.

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 extremely concise: two short paragraphs. The first states action, the second lists parameters with one line each. No redundancy, highly scannable.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 4-parameter tool with no annotations and no output schema described, the description covers action, parameters, and return value. It lacks usage guidelines and deeper behavioral context, but is still fairly complete for the given complexity.

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

Parameters5/5

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

Despite 0% schema coverage, the description explains all 4 parameters with clear semantics: semitones direction/example, unit_index/track_index/region_index meaning of -1. This adds significant value beyond the schema's bare type definitions.

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 'Transpose all notes by a number of semitones,' specifying the verb (transpose) and resource (notes). The sibling tool 'diatonic_transpose_notes' implies this is a chromatic transposition, distinguishing it from alternatives.

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 siblings or other transpose tools. It does not mention alternative approaches, when not to use, or prerequisites.

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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