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mcp_opendaw_create_sequence

Create a melodic sequence by repeating a pattern at transposed pitches. Control direction, repeats, velocity, and timing to build musical motifs.

Instructions

Create a melodic sequence — repeat a pattern at transposed pitch levels.

The most fundamental compositional technique in Western music: take a melodic fragment, repeat it at a different pitch (usually up/down a 4th or 5th). Think baroque sequences (Pachelbel), jazz ii-V-I chains, film score ascending quint sequences, or EDM build-ups with rising motifs.

pattern: Comma-separated MIDI pitches (e.g. "60,62,64,67"). transposition: Semitones to shift each repeat (default 5 = perfect 4th up). Common: 5 (4th), 7 (5th), 2 (major 2nd), -2 (down), -5 (4th down). repeats: Number of transposed repetitions (1-8, default 3). direction: "up" (transpose up), "down" (transpose down), "alternating" (up/down/up...). segment_beats: Duration of each pattern repetition in beats (0.5-16, default 2). velocity_decay: Velocity change per repeat (-0.3 to 0.3). Positive = louder, negative = quieter (fade-out). 0 = constant. unit_index: AU index with note track (-1 = find first AU with note tracks). track_index: Note track index within the AU. start_beat: Position in beats where the sequence begins. velocity: Base velocity 0-1 (default 0.8).

Returns notes created, repeat count, total transposition.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
patternNo60,62,64,60
repeatsNo
velocityNo
directionNoup
start_beatNo
unit_indexNo
track_indexNo
segment_beatsNo
transpositionNo
velocity_decayNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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. It adds substantial context about how parameters affect behavior (e.g., velocity_decay meaning, unit_index fallback to first AU). However, it does not address side effects like whether notes are appended or replaced, or error conditions when no AU/track is found, leaving some behavioral gaps.

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 well-structured and every sentence earns its place. It front-loads the core purpose, follows with useful musical context, and then provides a clear, parameter-by-parameter breakdown. This is appropriately sized for a 10-parameter tool with an empty schema.

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 complex tool with 10 parameters and no annotations, the description is mostly complete: it covers all parameters, provides return value information, and gives musical context. However, it lacks explicit statements about whether the tool creates new regions or appends to existing ones, and how errors are surfaced, leaving minor gaps in a complete mental model.

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?

Schema coverage is 0%, but the description compensates thoroughly by explaining every parameter with meaningful detail: patterns, ranges, defaults, and examples (e.g., transposition common values, direction options, velocity_decay semantics). This fully bridges the gap left by the schema.

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 opens with a specific verb and resource: 'Create a melodic sequence — repeat a pattern at transposed pitch levels.' This clearly distinguishes the tool from siblings like create_melody or create_ostinato by focusing on transposition as the core operation. The additional musical examples (baroque sequences, jazz ii-V-I chains) reinforce the unique purpose.

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?

The description provides clear context for when to use the tool ('the most fundamental compositional technique'), with genre examples that suggest appropriate scenarios. However, it does not explicitly mention alternatives or when not to use it, so it stops short of full usage guidance.

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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