Get Key

Tool name: get-key

Returns key signature, scale, diatonic chords with Roman numerals, primary triads, and secondary dominants.

Annotations

Hint	Value
readOnlyHint	✓
idempotentHint	✓
destructiveHint	—
openWorldHint	—

Input

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "tonic": {
      "type": "string",
      "minLength": 1,
      "description": "Key tonic (e.g. \"C\", \"F#\", \"Bb\")."
    },
    "mode": {
      "type": "string",
      "enum": [
        "major",
        "minor"
      ],
      "description": "Key mode."
    }
  },
  "required": [
    "tonic",
    "mode"
  ],
  "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": {
    "signature": {
      "type": "string",
      "description": "Key signature as accidentals (e.g. \"###\", \"bb\", \"\" for C major)."
    },
    "scale": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Notes of the key scale."
    },
    "diatonicChords": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "degree": {
            "type": "integer",
            "minimum": -9007199254740991,
            "maximum": 9007199254740991
          },
          "roman": {
            "type": "string"
          },
          "symbol": {
            "type": "string"
          }
        },
        "required": [
          "degree",
          "roman",
          "symbol"
        ],
        "additionalProperties": false
      },
      "description": "Diatonic triads with degree, Roman numeral, and chord symbol."
    },
    "primary": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Primary triads I, IV, V (or i, iv, v in minor)."
    },
    "secondaryDominants": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Secondary dominants (V/x) for the diatonic degrees that have one."
    }
  },
  "required": [
    "signature",
    "scale",
    "diatonicChords",
    "primary",
    "secondaryDominants"
  ],
  "additionalProperties": false
}