# io.github.chrischall/musescore-mcp (npm · @chrischall/musescore-mcp)

MuseScore for Claude — search sheet music and read score metadata via your signed-in browser

- Trust score: 63/100 (medium)
- Change this week: +55
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-08

## Components

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

## Channel facts

- Registry: `npm`
- Package: `@chrischall/musescore-mcp`
- Version: `0.15.4`
- 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 2026-08-08.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 42 of 132 dependencies flagged as unhealthy.
- **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 2 days ago).
  - Security-disclosure policy not yet verified: we couldn't inspect the source repository.
- **Schema Quality & AI Usability**: 64/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 2048 tokens (~204/item across 10 items; 10 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 10/100
  - Stability observed for 3 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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 chrischall-musescore-mcp -- npx -y @chrischall/musescore-mcp
```

### Codex

```bash
codex mcp add chrischall-musescore-mcp -- npx -y @chrischall/musescore-mcp
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add chrischall-musescore-mcp --command npx --arg -y --arg @chrischall/musescore-mcp
```

### Hermes

```yaml
mcp_servers:
  chrischall-musescore-mcp:
    command: "npx"
    args: ["-y", "@chrischall/musescore-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "chrischall-musescore-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@chrischall/musescore-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.

### 2026-08-08 (score 63, +4)

- [security improvement] Known CVEs: partial → pass
- [functional] Dependency health: partial → 0.85

### 2026-08-07 (score 59, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-06 (score 58, +28)

- [security] Stability: Stability not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet.
- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [functional improvement] Stability: unverified → 0.03
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] MCP protocol: unverified → pass
- [functional] First check of Tool coverage: 100
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: excellent
- [functional] Tool coverage: Tool coverage not yet verified: we do not have a sandbox capture of the tool definitions this version of the package serves yet.
- [functional] Capabilities: Protocol version not yet verified: we do not have a sandbox capture of the MCP handshake this version of the package performs yet.
- [functional] Schema quality: Schema quality not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet.
- [functional] Package version: 0.15.3 → 0.15.4

### 2026-08-05 (score 30, +1)

- [security improvement] CVE-2026-69207 no longer affects this package
- [security improvement] Known CVEs: fail → partial

### 2026-08-04 (score 29, −1)

- [security regression] CVE-2026-69207 affects this package: medium
- [security regression] Known CVEs: partial → fail

### 2026-08-02 (score 30, +22)

- [security regression] Provenance: fail → unverified
- [security regression] Install scripts: pass → unverified
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Malware scan: unverified → pass
- [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] License: pass → unverified
- [functional regression] Maintenance: pass → unverified
- [functional improvement] Dependency health: unverified → partial
- [functional] Capabilities: Protocol version not yet verified: we do not have a sandbox capture of the MCP handshake this version of the package performs yet.
- [functional] Tool coverage: Tool coverage not yet verified: we do not have a sandbox capture of the tool definitions this version of the package serves yet.
- [functional] Schema quality: Schema quality not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet.
- [functional] Licence: MIT

### 2026-08-01 (score 8, −10)

- [security regression] Known CVEs: partial → unverified
- [functional regression] Dependency health: partial → unverified

### 2026-07-31 (score 18, +18)

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

## MCP tools (10)

### `musescore_search` (~289 tokens)

Search MuseScore sheet music

Search musescore.com for sheet music. Returns score cards with id, title, uploader/arranger, original composer(s), instrumentation, page/part counts, duration, upload date, view/save counts, difficulty, and PRO/Official badges. Defaults to MuseScore's 'Free to view, play & download' facet (free_only=true); set free_only=false to search the whole catalog (most of which is paywalled for download). The free facet narrows results but does NOT guarantee a free account can download a given score — that is enforced at download time. Read-only.

Input parameters:

- `complexity` (string): Difficulty facet.
- `free_only` (boolean): Restrict to the "Free to view, play & download" facet. Defaults to true.
- `instrument` (string): Instrument facet: a supported instrument name (e.g. piano, guitar, violin, flute, trombone, baritone, tuba, organ, bassoon, saxophone alto, euphonium, cornet, accordion, soprano, alto, voice), or a M…
- `page` (integer): 1-based result page. Defaults to 1.
- `query` (string, required): Free-text search query.

### `musescore_get_score` (~174 tokens)

Get MuseScore score metadata

Fetch a single MuseScore score page and return its metadata: title, uploader/arranger, original composer(s), license, page/part counts, duration, measures, key, privacy, and upload/update dates. Identify the score by either a url (a musescore.com score URL or /user/<id>/scores/<id> path) or a user_id + score_id pair. Read-only; does not download the score (free-download eligibility is decided per-account at download time).

Input parameters:

- `score_id` (string): Numeric score id (with user_id).
- `url` (string): A musescore.com score URL or /user/<id>/scores/<id> path. Provide this OR user_id + score_id.
- `user_id` (string): Numeric uploader id (with score_id).

### `musescore_score_to_pdf` (~486 tokens)

Resolve or create a MuseScore score PDF

Resolve or create a PDF for a MuseScore score. If the score exposes an official PDF download and is free (is_free) or accessible (hasAccess), downloads the official PDF bytes to output_path (written: true, bytes, outputPath). Otherwise (incl. paid scores, or when the official download fails) fetches the page-1 render SVG — the score’s public thumbnail — and stitches it into output_path. The score is identified by a url (a musescore.com score URL or /user/<id>/scores/<id> path) or a user_id + score_id pair. Requires a signed-in MuseScore session. In mode "official", a view-free but Premium/purchase-gated download returns a structured {status:"gated", requiresPurchase, downloadUrl, scoreUrl, svgStitchAvailable} result rather than erroring.

Input parameters:

- `dpi` (number): Deprecated/ignored — SVG-stitch conversion is now vector (no rasterisation).
- `mode` (string): auto (default): the 3-tier fallback chain — official PDF (if entitled) → SVG-stitch PDF → PNG render → structured "gated". The result reports which tier won via `via` (official_pdf | svg_pdf | png_re…
- `output_path` (string, required): Local .pdf path to write. Parent directories are created.
- `pages` (array): 1-based page numbers for SVG-stitch mode. Only page 1 is available locally (pages 2+ are gated); requesting any other page errors. Ignored when an official PDF is downloaded. Defaults to page 1.
- `score_id` (string): Numeric score id (with user_id).
- `url` (string): A musescore.com score URL or /user/<id>/scores/<id> path. Provide this OR user_id + score_id.
- `user_id` (string): Numeric uploader id (with score_id).

### `musescore_fetch_svgs` (~231 tokens)

Fetch a score’s page SVGs to a directory

Download a score’s per-page render SVGs (from musescore.com/static) into output_dir as page_<n>.svg. Pairs with musescore_svg_to_pdf. Page 1 is always rendered (it is the score’s public thumbnail, so paid scores work too); multi-page scores succeed and the result carries pagesRendered/pagesTotal/truncated (truncated:true means pages 2+ are gated behind a protected API).

Input parameters:

- `output_dir` (string, required): Local directory to write page_<n>.svg into. Created if missing.
- `pages` (array): 1-based page numbers to fetch. Only page 1 is available locally (pages 2+ are gated behind a protected API); requesting any other page errors. Defaults to page 1.
- `score_id` (string): Numeric score id (with user_id).
- `url` (string): A musescore.com score URL or /user/<id>/scores/<id> path. Provide this OR user_id + score_id.
- `user_id` (string): Numeric uploader id (with score_id).

### `musescore_download` (~385 tokens)

Resolve or download an official MuseScore file

Get the official MuseScore file for a free or already-entitled score (pdf, mid, mscz, or mxl). Identify the score by a url (a musescore.com score URL or /user/<id>/scores/<id> path) or a user_id + score_id pair. Without output_path it returns the official download URL for you to open in your signed-in browser tab; with output_path it downloads the actual file bytes (incl. multi-page official PDF) to that local path. For PDF downloads, setting fallback_svg=true will render page 1 from its SVG when the official download is likely blocked (not free, no hasAccess) or fails (403, S3 error). If a score is view-free but its download is Premium/purchase-gated, returns a structured {status:"gated", requiresPurchase:true, downloadUrl, scoreUrl, svgStitchAvailable} result (no file written) rather than erroring.

Input parameters:

- `fallback_svg` (boolean): If true and the official PDF download is likely blocked (not free, no hasAccess) or fails (403, S3 error), fall back to rendering page 1 as a PDF from its SVG thumbnail. Defaults to false. Only appli…
- `format` (string): Download format. Defaults to pdf.
- `output_path` (string): If set, download the file bytes for the chosen format to this local path (parent dirs created). Omit to just resolve the official URL.
- `score_id` (string): Numeric score id (with user_id).
- `url` (string): A musescore.com score URL or /user/<id>/scores/<id> path. Provide this OR user_id + score_id.
- `user_id` (string): Numeric uploader id (with score_id).

### `musescore_healthcheck` (~106 tokens)

Verify the fetchproxy bridge end-to-end

Round-trips a small public musescore.com URL (/robots.txt) through the fetchproxy bridge and returns diagnostics: the bridge's role (host/peer/null), port, version, the elapsed round-trip time, and a plain-English hint distinguishing 'bridge never came up' from 'extension not connected' from 'real musescore.com-side problem'. Call this when a real tool fails and you want to know which hop broke. Read-only, no auth required.

### `musescore_svg_to_pdf` (~105 tokens)

Convert local SVG files to PDF

Convert local SVG or SVGZ files that already exist on disk into a PDF, one input file per page. Does not fetch files from MuseScore or any remote URL.

Input parameters:

- `dpi` (number): Deprecated/ignored — conversion is now vector (no rasterisation).
- `output_path` (string, required): Local .pdf path to write. Parent directories are created.
- `svg_paths` (array, required): Local .svg or .svgz file paths, in page order.

### `musescore_register_session` (~156 tokens)

Register a signed-in MuseScore session

Register (or refresh) an authenticated MuseScore session keyed by signed-in account identity. Re-registering the same `account_identity` updates the existing session rather than creating a duplicate. Returns the `session_id` to use when routing per-tool calls. The first registered session becomes the default `active_session_id`. Pass `mark_active: true` to make the newly-registered session active in the same call.

Input parameters:

- `account_identity` (string, required): Caller-supplied identifier for the signed-in account (typically the saved-account email).
- `auth_expires_at` (string): Optional ISO timestamp at which the session expires.
- `mark_active` (boolean): When true, immediately make the newly-registered session the active one.

### `musescore_set_active_session` (~69 tokens)

Set the active MuseScore session

Switch which registered session subsequent tool calls route through by default. Pass a `session_id` previously returned by `musescore_register_session`. Tools that accept an explicit `session_id` parameter override this default per-call.

Input parameters:

- `session_id` (string, required): Session id to make active.

### `musescore_get_session_context` (~47 tokens)

List all registered MuseScore sessions

Return the full set of registered sessions plus the current `active_session_id`. When no sessions are registered, `sessions` is empty and `active_session_id` is null.

## Diagnostics

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

## Score history

- 2026-08-08: 63
- 2026-08-07: 59
- 2026-08-06: 58
- 2026-08-05: 30
- 2026-08-04: 29
- 2026-08-03: 30
- 2026-08-02: 30
- 2026-08-01: 8
- 2026-07-31: 18
- 2026-07-30: 0
- 2026-07-28: 0
- 2026-07-27: 1
- 2026-07-26: 19

## Links

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