# io.github.asume21/music-theory-mcp (npm · music-theory-mcp)

Scales, chords, progressions, key detection, and genre intelligence for your AI. No API keys needed.

- Trust score: 63/100 (medium)
- Change this week: +23
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `music-theory-mcp`: 63/100 (this document), [markdown](https://verifymcp.io/servers/asume21-music-theory-mcp/music-theory-mcp.md), [page](https://verifymcp.io/servers/asume21-music-theory-mcp/music-theory-mcp)

## Channel facts

- Registry: `npm`
- Package: `music-theory-mcp`
- Version: `1.0.0`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Supply Chain Security**: 87/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 19/100
  - Repository check failed: the declared repository URL returned HTTP 404.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 123 days ago).
  - Security-disclosure policy not yet verified: we couldn't inspect the source repository.
- **Schema Quality & AI Usability**: 70/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 1151 tokens (~88/item across 13 items; 13 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 97/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 92% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add asume21-music-theory-mcp -- npx -y music-theory-mcp
```

### Codex

```bash
codex mcp add asume21-music-theory-mcp -- npx -y music-theory-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "asume21-music-theory-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "music-theory-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add asume21-music-theory-mcp --command npx --arg -y --arg music-theory-mcp
```

### Hermes

```yaml
mcp_servers:
  asume21-music-theory-mcp:
    command: "npx"
    args: ["-y", "music-theory-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "asume21-music-theory-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "music-theory-mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 63, +48)

- [security regression] Provenance: unverified → fail
- [security improvement] Install scripts: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] License: unverified → pass
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] Stability: unverified → 0.27
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Schema quality: unverified → good
- [functional] Licence: MIT

### 2026-08-02 (score 15, −1)

- [security improvement] Malware scan: unverified → pass
- [functional regression] Tool coverage: 100 → unverified

### 2026-08-01 (score 16, −5)

- [security] Stability: Stability not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet.
- [functional regression] Capabilities: pass → unverified

### 2026-07-31 (score 21, +3)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 18, −22)

- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified

### 2026-07-27 (score 40)

First indexed and scored.

## MCP tools (13)

### `get_scale` (~114 tokens)

Get the notes, intervals, and modes for any musical scale. Supports 20+ scale types including major, minor, pentatonic, blues, dorian, phrygian, lydian, mixolydian, and more. [FREE]

Input parameters:

- `root` (string, required): Root note (e.g., "C", "F#", "Bb")
- `type` (string, required): Scale type (e.g., "major", "natural_minor", "pentatonic_minor", "blues", "dorian")

### `get_chord` (~108 tokens)

Get the notes and intervals for any chord type. Supports triads, 7ths, 9ths, 11ths, 13ths, sus, aug, dim, and more (22+ chord types). [FREE]

Input parameters:

- `root` (string, required): Root note (e.g., "C", "F#", "Bb")
- `type` (string, required): Chord type (e.g., "major", "minor", "dom7", "maj7", "sus2")

### `identify_chord` (~65 tokens)

Identify a chord from a set of note names. Returns all possible interpretations with root, type, and inversion. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `notes` (array, required): Array of note names (e.g., ["C", "E", "G"])

### `detect_key` (~86 tokens)

Detect the most likely musical key from a set of observed notes. Returns top candidates with confidence scores. Useful for analyzing melodies or MIDI data. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `notes` (array, required): Array of note names observed in the piece (e.g., ["C", "D", "E", "F", "G", "A", "B"])

### `resolve_progression` (~108 tokens)

Resolve a Roman numeral chord progression (e.g., I-V-vi-IV) to actual chord names and notes in a given key. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `key` (string, required): Key root note (e.g., "C", "F#")
- `mode` (string): Major or minor key
- `numerals` (array, required): Chord progression as Roman numerals (e.g., ["I", "V", "vi", "IV"])

### `suggest_next_chord` (~86 tokens)

Suggest what chord should come next based on common voice leading tendencies. Given a current chord and key, returns ranked suggestions. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `current_numeral` (string, required): Current chord as Roman numeral (e.g., "V", "vi")
- `key` (string, required): Key root note
- `mode` (string)

### `get_diatonic_chords` (~71 tokens)

Get all 7 diatonic chords in a key with Roman numerals, chord symbols, and notes. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `key` (string, required): Key root note (e.g., "C", "Ab")
- `mode` (string)

### `get_genre_profile` (~145 tokens)

Get full genre intelligence: common chord progressions, scales, BPM range, instruments, rhythmic feel, swing amount, common keys, and mood descriptors. Supports trap, boom_bap, drill, lofi_hiphop, rnb, pop, afrobeats, reggaeton, jazz, edm, gospel. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `genre` (string, required): Genre name (e.g., "trap", "boom_bap", "lofi_hiphop", "rnb", "drill", "afrobeats", "jazz", "edm", "pop", "reggaeton", "gospel")

### `suggest_genre` (~113 tokens)

Suggest a genre based on BPM, key, mood, or scale. Returns ranked matches with reasoning. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `bpm` (number): Beats per minute
- `key` (string): Musical key (e.g., "C", "F#")
- `mood` (string): Mood keyword (e.g., "dark", "chill", "energetic")
- `scale` (string): Scale type (e.g., "natural_minor", "dorian")

### `get_genre_rhythms` (~63 tokens)

Get common drum/rhythm patterns for a genre. Returns kick, snare, and hi-hat step patterns ready to load into a beat maker. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `genre` (string, required): Genre name

### `transpose_note` (~71 tokens)

Transpose a single note up or down by a number of semitones. [FREE]

Input parameters:

- `note` (string, required): Note to transpose (e.g., "C", "F#")
- `semitones` (number, required): Number of semitones to shift (positive = up, negative = down)

### `transpose_progression` (~71 tokens)

Transpose an entire chord progression by a number of semitones. Takes an array of {root, type} objects. [PRO — requires CODEDSWITCH_API_KEY]

Input parameters:

- `chords` (array, required): Array of chords to transpose
- `semitones` (number, required): Semitones to shift

### `get_interval` (~50 tokens)

Get the musical interval name between two notes (e.g., C to G = P5). [FREE]

Input parameters:

- `note_a` (string, required): First note
- `note_b` (string, required): Second note

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/asume21-music-theory-mcp/music-theory-mcp#diagnostics

## Score history

- 2026-08-03: 63
- 2026-08-02: 15
- 2026-08-01: 16
- 2026-07-31: 21
- 2026-07-30: 18
- 2026-07-28: 40
- 2026-07-27: 40

## Links

- npm package: https://www.npmjs.com/package/music-theory-mcp
- Socket report: https://socket.dev/npm/package/music-theory-mcp
- Changelog RSS feed: https://verifymcp.io/servers/asume21-music-theory-mcp/music-theory-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/asume21-music-theory-mcp/music-theory-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/asume21-music-theory-mcp/music-theory-mcp