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 connecting media tools to Claude, Cursor, VS Code, or another MCP client. The project is written in JavaScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-10 · ★ 6 · #53 OF 155 MAINTAINED MEDIA · VERIFIED 2026-08-25

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 2026-08-25

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 #53 of 155 actively-maintained media servers as of 2026-08-25.
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 2026-08-25, 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 2026-08-25; 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 · Video Editing MCP · Oh My Cassette

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