mozart-claude-plugin
MIDI plugin for Claude Code — load, analyze, edit, and compose MIDI files with musical intelligence.
Features
- Load & parse MIDI files with full structural awareness
- Time signature and tempo aware — understands measures, beats, and tempo changes
- Navigate by measure — seek to any measure or phrase, not just byte offsets
- Search notes — find notes by pitch, name, track, or measure range
- Edit in place — add, delete, transpose, and quantize notes
- Compose from scratch — create new MIDI files with tracks, instruments, and notes
- Save changes — write edits back to standard MIDI files
Install
After adding the fingerskier marketplace:
claude plugin marketplace add fingerskier/claude-plugins
claude plugin install mozart@fingerskier-plugins
Or install directly:
claude mcp add mozart -- npx -y mozart-claude-plugin mcp
Skills
| Skill | Description |
|---|
/play | Load and explore MIDI files — analyze structure, browse measures, search notes |
/compose | Create and edit MIDI — add notes, change tempo, transpose, quantize, save |
MCP Tools
| Tool | Description |
|---|
load_midi | Parse a MIDI file and load it into memory |
midi_info | Get detailed metadata — tempo, time sig, tracks, instruments, pitch ranges |
get_measures | Get notes organized by measure (time-signature aware) |
search_notes | Search for notes by pitch, name, track, or measure range |
add_notes | Insert notes at measure/beat positions |
delete_notes | Remove notes from a measure range |
transpose | Shift notes up or down by semitones |
quantize | Snap note timing to a rhythmic grid |
set_tempo | Set or change tempo at any point |
set_time_signature | Set or change time signature |
add_track | Add a new track with name and instrument |
set_instrument | Change a track's General MIDI instrument |
create_midi | Create a new empty MIDI file |
save_midi | Write the MIDI file to disk |
list_loaded | Show all loaded files |
unload_midi | Remove a file from memory |
Example Usage
> Load song.mid and show me what's in the first 4 measures
> Create a 12-bar blues in C at 120 BPM with piano and bass
> Transpose the melody up a minor third
> Quantize track 2 to eighth notes
> Show me all the C# notes in the bass track
License
MIT
fingerskier
