THIRI Chord Intelligence MCP Server

Give your AI real music theory. THIRI is the deterministic music theory MCP server + API for AI builders - it lets Claude, Cursor, or any MCP agent analyze chords, run roman-numeral analysis, generate voicings, and reharmonize progressions with answers that are computed, not guessed. Its 9 documented tools cover analyze, chord, conduct.

People who work with analyze, chord and conduct and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in JavaScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-10 · ★ 10 · #79 OF 173 MAINTAINED MEDIA · VERIFIED 2026-09-18

NOASSERTION · JavaScript servers · how we verify → /methodology

01 · Install THIRI Chord Intelligence

before you install - you'll need

THIRI_API_KEY

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add bluesprince-thiri-mcp --transport http https://mcp.thiri.ai/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "bluesprince-thiri-mcp": {
      "url": "https://mcp.thiri.ai/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.thiri.ai/mcp

transport: streamable-http

endpoint alive - responded to MCP initialize · probed 2026-09-17

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to mcp.thiri.ai

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license no standard license detected - usage rights unclear; check the repo before commercial use

npm package @bluesprincemedia/thiri-mcp - the @bluesprincemedia scope differs from the repo owner (bluesprince); confirm it's the project's official package

registry vendor namespace ai.thiri - domain-verified with the official MCP registry

03 · What THIRI Chord Intelligence can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 9 documented tools spanning analyze, chord, conduct, including analyze_chord, resolve_chord, generate_voicing, reharmonize.

Capability map

Tools grouped from the project's README - what THIRI Chord Intelligence lets an agent do.

Analyze

2 tools - e.g. Chord → root, quality, intervals, roman numeral & harmonic function (secondary dominants, modal-interchange labels); "Analyze Dm7 G7 Cmaj7 in key C with analyze_chord; summarize roman numerals and…

analyze_chord · Analyze

Conduct

2 tools - e.g. Natural-language band conduct → lanes + MIDI (hosted MCP v0.3+); "conduct_band: warm Rhodes pad, walking bass, brush drums, 8 bars medium swing in C."

conduct_band · Conduct

Resolve

1 tool - e.g. Chord → spelled notes (enharmonically correct), frequencies, MIDI, scale recommendations

resolve_chord

Generate

1 tool - e.g. Instrument-ready voicings (rootless/bill_evans, shell, triad, pad, guide-tones, drop-2/3); pass previousNotes for a voice-leading score; colorPreferences for ex

generate_voicing

Reharmonize

1 tool - e.g. Progression reharmonization - 8 techniques: tritone_sub, ii_v_insertion, modal_interchange, diminished_passing, secondary_dominant, chain_of_dominants, coltrane

reharmonize

Render

1 tool - e.g. "render_audio from the conduct result at tempo 120."

Render

Critique

1 tool - e.g. "play_audio; critique voice-leading and register balance; suggest one revision."

Critique

Latest releases

v0.5.0 · 2026-07-29

The composition engine and the Csound render chain no longer ship in this package - both run server-side, and the Desktop companion servers became thin clients over the hosted API. · thiri-conductor-mcp: new…

v0.3.0 · 2026-07-19

First GitHub release, recapping the arc from 0.1.0 (2026-05-31) to 0.3.0 (2026-06-19) as published on npm. · 0.3.0 · conduct_band - natural-language band conduct → lanes + MIDI (hosted MCP) · thiri-conductor-mcp…

04 · Who maintains THIRI Chord Intelligence

THIRI Chord Intelligence is maintained by bluesprince. It's the only MCP server we track from this author; the repo dates to May 2026.

05 · Facts

repository: github.com/bluesprince/thiri-mcp
website: https://thiri.ai/
category: media - ranked #79 of 173 actively-maintained media servers as of 2026-09-18.
release cadence: 2 releases in the last 90 days (latest 2026-07-29)
registry: ai.thiri/chord-intelligence (active, first published 2026-06-18 · 3 versions)
packages: npm:@bluesprincemedia/thiri-mcp

06 · THIRI Chord Intelligence FAQ

Is THIRI Chord Intelligence still maintained?

Yes - as of 2026-09-18, its last commit was 2026-08-10 and it shipped 2 releases in the last 90 days. We re-verify nightly.

What can THIRI Chord Intelligence do?

An agent gets 9 documented tools spanning analyze, chord, conduct, including analyze_chord, resolve_chord, generate_voicing, reharmonize.

How do I install THIRI Chord Intelligence?

Run `npx -y @bluesprincemedia/thiri-mcp`. The README documents one environment variable (THIRI_API_KEY) to set first. You can also paste the ready-made client config above.

Does THIRI Chord Intelligence require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-09-17; you can connect without credentials.

07 · Alternatives to THIRI Chord Intelligence

Alternatives to THIRI Chord Intelligence

Maintained media servers if THIRI Chord Intelligence isn't the fit.

More media MCP servers · The Scribble Thing · Image to SVG · Levea MCP Server · Budgetpixel Ai MCP Server · Video Editing MCP

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