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mcp_opendaw_create_cadenza

Create a virtuosic solo cadenza with rubato, using expressive segments like flourishes, leaps, and trills. Supports classical, romantic, jazz, and modern styles.

Instructions

Create a cadenza — an unmeasured virtuosic solo passage with rubato.

A cadenza is a solo passage where the performer has rhythmic freedom. Unlike all other tools that use quantized beat grids, cadenzas use irregular, speech-like rhythm — accelerando, rallentando, fermatas, and dramatic pauses. The notes follow a virtuosic contour: rapid runs, wide leaps, trills, and dramatic peaks.

Styles: classical — Mozart/Beethoven style: balanced phrases, cadential trills romantic — Liszt/Chopin style: dramatic octaves, cascading runs jazz — Coltrane/Parker style: bebop lines, chromatic turns modern — Ligeti/Berio style: extreme registers, clusters

The cadenza is built from segments, each with its own tempo character:

  • Flourish: rapid ascending/descending run

  • Leap: dramatic wide interval jump

  • Trill: alternating two pitches rapidly

  • Fermata: held note with pause after

  • Cascade: descending arpeggio pattern

  • Climb: gradual ascending with crescendo

Args: root: Root note name (C, C#, D, ...). scale: Scale name (major, minor, harmonic_minor, etc.). duration_beats: Approximate total duration in beats (4-64). octave: Starting MIDI octave (2-6). style: Cadenza style (classical, romantic, jazz, modern). virtuosic: If True, more rapid passages and wider leaps. breath_marks: Comma-separated beat positions for pauses/breaths. velocity: Base velocity 0-1 (cadenzas have wide dynamic range). unit_index: AU index. track_index: Note track index. start_beat: Starting beat position.

Returns notes created, segment breakdown, and cadenza statistics.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
rootNoC
scaleNominor
styleNoclassical
octaveNo
velocityNo
virtuosicNo
start_beatNo
unit_indexNo
track_indexNo
breath_marksNo
duration_beatsNo

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 burden of behavioral disclosure. It explains the cadenza's irregular rhythm, virtuosic contour, segment-based construction, and tempo characteristics, and states that it returns notes created, segment breakdown, and cadenza statistics. It does not detail potential side effects like overwriting existing notes or requiring an existing track, but the core generative behavior is transparent.

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 well-structured with clear sections for definition, styles, segment types, and argument descriptions. It is longer than average, but the architectural detail is relevant and helps the agent make informed choices. A few conceptual points are somewhat redundant, but overall the structure is efficient and front-loaded.

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?

Given the tool's complexity (11 parameters, no annotations, no schema descriptions), the description provides a comprehensive overview: what a cadenza is, how rhythm differs from other tools, available styles and segments, parameter meanings, and return values. It stops short of describing operational preconditions like track/unit validation or exact note-placement behavior, but it is sufficient for initial selection and invocation.

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 description coverage is 0%, so the description's Args section fully compensates by documenting all 11 parameters with meaningful one-line explanations. It adds semantics beyond the bare schema, such as 'duration_beats: Approximate total duration in beats (4-64)' and 'breath_marks: Comma-separated beat positions for pauses/breaths,' which are essential for correct invocation.

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 defines the tool as 'Create a cadenza — an unmeasured virtuosic solo passage with rubato,' providing a specific verb and resource. It explicitly distinguishes itself from siblings by stating 'Unlike all other tools that use quantized beat grids, cadenzas use irregular, speech-like rhythm,' making its unique purpose unmistakable.

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 gives strong contextual guidance by explaining that cadenzas use unmeasured, speech-like rhythm as opposed to the quantized beat grids of other tools, implying when this tool is appropriate. It also provides style and segment options to help shape usage, though it doesn't name specific alternative tools or state explicit 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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