DEVELOPER INFRASTRUCTURE · MCP & REST · PROTOCOL v2.1
Stop your agents from hallucinating chords. Five deterministic theory tools over MCP and REST, live in 60 seconds.
Claude and Gemini are incredible at conversational intent, session planning, and creative direction. But when you ask an LLM to calculate chord voicings, voice leading, or interval arithmetic, it guesses based on token probability.
THIRI gives your agents an objective musical brain:
Claude, Gemini, Cursor, or your own backend orchestrates the session.
Instant, mathematically verified chord analysis, voice leading, and arrangement data computed from pitch-class sets.
Identical input yields the identical, theory-correct musical decision every time.
DOOR 1 · CODE TONIGHT
For developers ready to wire Claude, Cursor, or Gemini into their app right now.
chords.thiri.aiFIRST 55
DOOR 2 · BUILD TOGETHER
For engineers, hackers, and creators building the next generation of music technology.
One API key unlocks five core tools across MCP and REST:
analyze_chord Parse any chord symbol or collection of notes into root, quality, intervals, extensions, and roman-numeral harmonic function.
resolve_chord Resolve any chord symbol into spelled pitch classes, exact frequencies in Hz, MIDI note numbers, and recommended improvisation scales.
generate_voicing Generate idiomatic, instrument-ready voicings (drop-2, rootless, quartal, shell) with voice-leading constraints from the previous bar.
reharmonize Return up to 4 complete reharmonization branches for any progression (diatonic substitutions, secondary dominants, tritone subs, Coltrane changes).
conduct_band Translate high-level musical prompts into fully voiced multi-track MIDI lanes (bass, drums, chordal bed, melody).
1 · HOSTED CONNECTOR
Add a custom connector in Claude with one URL and paste your key. No local install required:
2 · LOCAL STDIO
Add to your project or terminal with zero dependencies:
claude mcp add thiri --env THIRI_API_KEY=your_key -- npx -y @bluesprincemedia/thiri-mcpBuilding music technology with autonomous agents, real-time MIDI, and embedded DSP is brand new. T.H.I.R.I. Builders is our community on Skool where music hackers collaborate, share recipes, and troubleshoot:
20-minute live screen-shares dissecting production code—from our 0.592 ms MUTEK Elk Stomp build to Csound WASM hacks and multi-agent MIDI routing. The pedal is not a product.
Bring what you're building. Get direct troubleshooting on buffer underruns, latency spikes, or agent prompting hurdles.
Early access to experimental client recipes, private GitHub templates, and direct founder support.