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mcp_opendaw_create_scale_run

Generate ascending or descending scale runs for fills and transitions. Specify scale, root, direction, octaves, and note duration to produce melodic sequences.

Instructions

Create a scale run — ascending or descending scale sequence for fills and transitions.

Generates a sequence of scale notes moving up or down across one or more octaves. Used for drum fills, melodic transitions, lead build-ups, and bass walks.

scale: Scale type (major, minor, dorian, phrygian, blues, etc. — 14 types from music_theory). root: Root note name (C, C#, D, ... B). direction: "up" (ascending) or "down" (descending). octaves: Number of octaves to span (1-4). 1 = 7-8 notes, 2 = 14-15 notes, etc. unit_index: AU index. track_index: Note track index. start_beat: Starting beat position. step_duration: Duration of each note in beats (0.125 = 8th triplet, 0.25 = 16th). velocity: Note velocity 0-1. octave: Starting octave (1-7, default 4).

Returns total notes created and scale info.

Example: create_scale_run(scale="minor", root="A", direction="up", octaves=2, step_duration=0.0625)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
rootYes
scaleYes
octaveNo
octavesNo
velocityNo
directionNoup
start_beatNo
unit_indexNo
track_indexNo
step_durationNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

Describes the generated output (sequence of scale notes across octaves) and mentions the return value (total notes created, scale info). No annotations exist, so the description carries the burden; it provides reasonable behavioral insight without covering every edge case.

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?

Concise yet informative: opening verb phrase, a short description, parameter list, and an example. No wasted words, well-organized with line breaks for readability.

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

Completeness5/5

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

Given the complexity (10 parameters, output schema exists), the description covers purpose, usage, parameters, and return value. It is self-contained and provides enough information for an agent to correctly invoke the tool.

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?

All 10 parameters are explained with brief descriptions (e.g., scale type includes 14 types from music_theory, step_duration examples). Schema coverage is 0%, so the description fully compensates by adding meaning beyond the schema titles and defaults.

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?

Clearly states the tool creates ascending or descending scale sequences for fills and transitions. Distinguishes from sibling 'create_' tools by specifying it generates a scale run rather than other patterns.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly lists use cases (drum fills, melodic transitions, lead build-ups, bass walks), providing context for when to use. Does not specify when not to use or offer alternatives, but the listed uses are specific enough.

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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