Generate Arpeggio MIDI

Tool name: generate-arpeggio-midi

Renders a chord as a sixteenth-note arpeggio MIDI file (SMF1, 480 PPQ, 4/4) using the chosen pattern.

Annotations

Hint	Value
readOnlyHint	✓
idempotentHint	✓
destructiveHint	—
openWorldHint	—

Input

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "chord": {
      "type": "string",
      "minLength": 1,
      "description": "Chord symbol (e.g. \"Cmaj7\", \"F#m7b5\")."
    },
    "tempo": {
      "type": "integer",
      "minimum": 20,
      "maximum": 300,
      "description": "Tempo in BPM."
    },
    "pattern": {
      "type": "string",
      "enum": [
        "up",
        "down",
        "alternating",
        "random"
      ],
      "description": "Arpeggio direction. \"random\" is seeded by the input so it is reproducible."
    },
    "bars": {
      "type": "integer",
      "minimum": 1,
      "maximum": 32,
      "description": "Number of 4/4 bars (16 sixteenth notes per bar)."
    }
  },
  "required": [
    "chord",
    "tempo",
    "pattern",
    "bars"
  ],
  "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": {
    "midiBase64": {
      "type": "string",
      "description": "Base64-encoded Standard MIDI File bytes."
    },
    "format": {
      "type": "string",
      "const": "smf1",
      "description": "SMF format type 1."
    },
    "ppq": {
      "type": "number",
      "const": 480,
      "description": "Pulses per quarter note."
    },
    "durationMs": {
      "type": "integer",
      "minimum": 0,
      "maximum": 9007199254740991,
      "description": "Total duration in milliseconds."
    },
    "trackCount": {
      "type": "integer",
      "exclusiveMinimum": 0,
      "maximum": 9007199254740991,
      "description": "Number of MIDI tracks."
    }
  },
  "required": [
    "midiBase64",
    "format",
    "ppq",
    "durationMs",
    "trackCount"
  ],
  "additionalProperties": false
}