Analyze Voice Leading

Tool name: analyze-voice-leading

Compares two chord voicings (paired strictly by index) and flags parallel 5ths/octaves and leaps > octave.

Annotations

Hint	Value
readOnlyHint	✓
idempotentHint	✓
destructiveHint	—
openWorldHint	—

Input

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "from": {
      "type": "object",
      "properties": {
        "chord": {
          "type": "string",
          "minLength": 1,
          "description": "Chord symbol for context."
        },
        "voicing": {
          "minItems": 1,
          "type": "array",
          "items": {
            "type": "string",
            "minLength": 1
          },
          "description": "Notes in scientific pitch notation (e.g. [\"C4\",\"E4\",\"G4\"])."
        }
      },
      "required": [
        "chord",
        "voicing"
      ],
      "additionalProperties": false
    },
    "to": {
      "type": "object",
      "properties": {
        "chord": {
          "type": "string",
          "minLength": 1,
          "description": "Chord symbol for context."
        },
        "voicing": {
          "minItems": 1,
          "type": "array",
          "items": {
            "type": "string",
            "minLength": 1
          },
          "description": "Notes in scientific pitch notation (e.g. [\"C4\",\"E4\",\"G4\"])."
        }
      },
      "required": [
        "chord",
        "voicing"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "from",
    "to"
  ],
  "additionalProperties": false
}

Output

Returned as structuredContent. The text rendering is a short human-readable summary.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "perVoice": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "from": {
            "type": "string"
          },
          "to": {
            "type": "string"
          },
          "semitones": {
            "type": "integer",
            "minimum": -9007199254740991,
            "maximum": 9007199254740991
          },
          "direction": {
            "type": "string",
            "enum": [
              "up",
              "down",
              "static"
            ]
          }
        },
        "required": [
          "from",
          "to",
          "semitones",
          "direction"
        ],
        "additionalProperties": false
      },
      "description": "Per-voice motion, paired by index."
    },
    "warnings": {
      "type": "array",
      "items": {
        "oneOf": [
          {
            "type": "object",
            "properties": {
              "type": {
                "type": "string",
                "const": "parallel-fifths"
              },
              "voices": {
                "type": "array",
                "prefixItems": [
                  {
                    "type": "integer",
                    "minimum": -9007199254740991,
                    "maximum": 9007199254740991
                  },
                  {
                    "type": "integer",
                    "minimum": -9007199254740991,
                    "maximum": 9007199254740991
                  }
                ]
              }
            },
            "required": [
              "type",
              "voices"
            ],
            "additionalProperties": false
          },
          {
            "type": "object",
            "properties": {
              "type": {
                "type": "string",
                "const": "parallel-octaves"
              },
              "voices": {
                "type": "array",
                "prefixItems": [
                  {
                    "type": "integer",
                    "minimum": -9007199254740991,
                    "maximum": 9007199254740991
                  },
                  {
                    "type": "integer",
                    "minimum": -9007199254740991,
                    "maximum": 9007199254740991
                  }
                ]
              }
            },
            "required": [
              "type",
              "voices"
            ],
            "additionalProperties": false
          },
          {
            "type": "object",
            "properties": {
              "type": {
                "type": "string",
                "const": "large-leap"
              },
              "voice": {
                "type": "integer",
                "minimum": -9007199254740991,
                "maximum": 9007199254740991
              },
              "semitones": {
                "type": "integer",
                "minimum": -9007199254740991,
                "maximum": 9007199254740991
              }
            },
            "required": [
              "type",
              "voice",
              "semitones"
            ],
            "additionalProperties": false
          }
        ]
      },
      "description": "Voice-leading warnings: parallel 5ths/octaves and leaps > octave."
    }
  },
  "required": [
    "perVoice",
    "warnings"
  ],
  "additionalProperties": false
}