mcp-strudel
Enables conversion between Strudel mini-notation patterns and MIDI notes, allowing Claude to generate and manipulate musical patterns and write them into Ableton clips via integration with AbletonMCP.
README
mcp-strudel - Strudel ↔ MIDI MCP server
An MCP server that exposes the Strudel
mini-notation engine (shared with the m4l-strudel device) as tools Claude can
call. Combine it with ableton-mcp so you can say things like "lay down a
bd(3,8) kick and a c5 [e5 g5]*2 bassline" and have Claude convert the
patterns and write them into Ableton clips.
Tools
| Tool | Input | Output |
|---|---|---|
strudel_to_midi |
pattern, bars, cycles, conv, octaveOffset, velocity |
JSON note events (pitch, start, duration in beats) + lengthBeats |
midi_to_strudel |
notes[], bars, grid, conv, octaveOffset |
mini-notation text |
strudel_validate |
pattern |
parse errors or "OK" |
conv = strudel (c5=60, default) or scientific (c4=60).
Run
pnpm install
pnpm test # engine contract tests (vitest)
pnpm start # launches the stdio MCP server (tsx src/server.ts)
Wire it into Claude
Add to the MCP config you pass to the Claude Code CLI (e.g. the mcp-config.json
that the m4l-claude device generates), alongside AbletonMCP:
{
"mcpServers": {
"AbletonMCP": { "command": "uvx", "args": ["ableton-mcp"] },
"strudel": {
"command": "npx",
"args": ["-y", "tsx", "C:/Users/jaime/src/livecam-m4l/tmp/mcp-strudel/src/server.ts"]
}
}
}
With both servers available, Claude can call strudel_to_midi to turn a pattern
into notes, then use AbletonMCP's clip/note tools to create the clip - the
m4l-strudel → mcp-strudel → ableton-mcp path, orchestrated in natural language.
Engine
src/lib/mini/ is the same parser/scheduler/unparser as the m4l-strudel
device (recursive-descent parser, Bjorklund euclidean rhythms, cycle scheduler,
grid quantizer). Keeping one engine means the device and the server always agree
on how a pattern sounds.
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