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BluesPrince

THIRI Chord Intelligence — Music Theory MCP Server

generate_voicing

Read-onlyIdempotent

Generate instrument-ready chord voicings in specified styles (rootless, drop-2, guide-tones, etc.) with voice leading analysis by passing previous notes or a prior voicing object for smooth transitions.

Instructions

Generate instrument-ready voicings for a chord in a specified style. Pass previousNotes (or a previousVoicing object) from an earlier result to get a voiceLeadingScore for the transition. Styles: rootless, bill_evans, shell, triad, pad, guide-tones, guide-tone-1, guide-tone-2, both-guide-tones, drop-2, drop-3.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
chordYesChord symbol (e.g. 'Dm7')
styleNoVoicing style (default: 'pad'). bill_evans is an alias of rootless.
octaveNoBase octave (default: 3)
densityNoTarget voicing density / note count hint
keyContextNoKey context for diatonic color hooks (e.g. 'C major')
previousNotesNoPrevious voicing notes for voice leading (e.g. ['E3', 'G3', 'Bb3', 'D4'])
previousVoicingNoPrior generate_voicing JSON result for strict guide-tone line tracking
colorPreferencesNoExplicit color-tone overrides
Behavior4/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is clear. The description adds behavioral detail (returns a voiceLeadingScore) without contradicting annotations.

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?

Two sentences: first defines the core purpose, second adds voice leading usage. No wasted words, front-loaded, and all information is relevant.

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

Completeness3/5

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

With no output schema, the description could detail the return format (e.g., a JSON object with voicing notes and score). The current description mentions 'instrument-ready voicings' and 'voiceLeadingScore' but is vague on structure. Adequate but not complete.

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

Parameters4/5

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

Schema coverage is 100%, so baseline is 3. The description adds value by explaining the relationship between previousNotes and previousVoicing and returning a voiceLeadingScore, which goes beyond the individual parameter descriptions.

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 uses a specific verb ('generate') and resource ('instrument-ready voicings') and lists all supported styles. It clearly distinguishes from sibling tools (analyze_chord, reharmonize, resolve_chord) which serve different purposes.

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 explains how to use previousNotes or previousVoicing for voice leading, which provides clear context. It doesn't explicitly exclude scenarios or compare to siblings, but the context is sufficient for an AI to decide when to use this tool.

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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