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Arts & Culture · Education & Learning
Strudel MCP Server
williamzujkowski/strudel-mcp-server
MCP server for AI-assisted live-coding music via strudel.cc.
Install
npm install -g @williamzujkowski/live-coding-music-mcpClient configuration
{
"mcpServers": {
"live-coding-music": {
"command": "live-coding-music-mcp"
}
}
}- Author
- @williamzujkowski
- Category
- Arts & Culture, Education & Learning
- License
- AGPL-3.0
- Updated
- Oct 6, 2026
About Strudel MCP Server
Unofficial fan project. Not affiliated with, or endorsed by, the Strudel project. This adapter exists to make live-coding music accessible to beginners who want to try pattern-based music without learning the whole ecosystem first.
Features
28 MCP tools covering pattern editing, playback, audio analysis, generation, history, sessions, MIDI import/export, and Gemini-backed assists. Each tool is enum-parameterized to keep the protocol…
4 MCP resources for catalog browsing without burning tool calls: strudel://examples, strudel://patterns, strudel://styles, strudel://docs/tools.
Real browser automation of Strudel.cc through Playwright.
Multi-session support — every browser-touching tool accepts an optional session_id; sessions have isolated browser pages, undo/redo/history stacks, and audio-capture services.
Audio analysis via Web Audio API (FFT spectrum, tempo detection, key detection, rhythm complexity).
Template-based pattern generation across 8 genres (techno, house, dnb, ambient, trap, jungle, jazz, experimental); optional Gemini-backed ai_assist for feedback, suggestions, and jamming.
Music theory helpers: 14 scales, 8 chord progression styles, euclidean and polyrhythm generation.
Pattern persistence: JSON-backed save/load with tags + the in-memory edit history (undo/redo/restore/compare).
Result envelope on every tools/call: clients branch on { ok, errorCategory, isRetryable } instead of parsing free-text.
3060 passing tests: npm test runs ~3020 unit/integration/example tests in parallel, then 36 browser-validation tests serially against real Chromium. The coverage figure below is from the first tier,…
Tools (28)
init
Initialize Strudel in browser
edit_pattern
Mutate the current session pattern. mode=write replaces the editor contents (default; mirrors the old write tool exactly, including optional pattern validation…
get_pattern
Get current pattern code
playback
Control transport on the current session. action=play starts the editor pattern. action=pause halts the clock where it is, so play resumes mid-cycle.…
set_tempo
Set BPM.
pattern_store
Persist patterns to disk and read them back.
import_midi
Convert a.mid file into a playable Strudel pattern (Phase 1: literal transcription, #201).
history
Navigate or inspect the pattern edit history. action=undo reverts the last edit on the targeted session. action=redo replays a previously-undone edit.…
compose
Generate, write, and play a complete pattern in one step.
generate_part
Generate a single instrumental layer and append it to the current session pattern. role=drums takes style (e.g.
generate_rhythm
Generate a rhythmic pattern and append it to the current session. type=euclidean produces a Euclidean rhythm with hits evenly distributed across steps…
music_theory
Music-theory queries. query=scale returns the notes of a scale (e.g.
transform
Apply a single transform op to the current session pattern. op=transpose shifts notes by semitones. op=reverse appends.rev to the pattern. op=stretch slows by…
effect
Add or remove a Strudel effect on the current session pattern. action=add appends.<effect>(<params>). action=remove strips EVERY.<effect>(...) call from the…
shape
Shape the current pattern along one of three high-level dimensions. dimension=mood applies a mood profile…
ai_assist
Gemini-backed pattern assistance. task=feedback returns creative critique on the current pattern (optionally with audio analysis). task=suggest analyzes the…
analyze
Audio analysis on the currently-playing pattern. include=["all"] (default) returns the full spectrum + features object, matching the pre-consolidation…
validate_pattern_runtime
Validate pattern with runtime error checking (monitors Strudel console for errors)
validate_pattern_local
Validate pattern syntax against the local StrudelEngine, which runs in a sandboxed child process (no browser required)
analyze_pattern_local
Static analysis (events/cycle, complexity, optional BPM) without browser playback
query_pattern_events
Enumerate events the pattern would emit between two cycle indices (max 16 cycles)
transpile_pattern
Transpile pattern source via StrudelEngine; returns transpiled code or syntax error
session
Manage isolated Strudel browser sessions (multi-session, #108). action=create starts a new named session (sessions share one browser but isolated contexts).…
export_midi
Export current pattern to MIDI file.
browser_window
Interact with the visible Strudel browser window. action=show brings the window to the foreground. action=screenshot captures the current editor view to disk…
audio_capture
Record audio output from the live Strudel session. action=start begins streaming capture (optional format webm/opus, default webm). action=stop ends the stream…
diagnostics
Inspect server and browser state. level=status returns a quick state snapshot (cache read, <15ms SLA), plus which config.json was read and any warnings from…
export_audio
Record a window of live Strudel audio and write it to a file.
Details on this page are taken from the project's README. Open README
Supported clients
Clients mentioned in this server's README:
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