Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Sheet Music Mcp

Six MCP servers that let an AI assistant work with sheet music: read a photo of a score, render it, play single voice parts, edit it as text, compare editions and follow a singer in real time.

Compatibility: Not stated.

Grade C

One Medium finding. Read the report before installing.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

INSTALL_REMOTE_SCRIPT

Why this grade

  • INSTALL_REMOTE_SCRIPT Medium

    Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).

    comparer-mcp/install.sh, line 33 curl -LsSf https://astral.sh/uv/install.sh | sh

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Note

    requests shell access. The manifest names this permission.

    PERMISSION_SHELL_DECLARED

    omr-mcp/src/omr_mcp/omr_engine.py, line 225

    subprocess.run(

    omr-mcp/src/omr_mcp/omr_engine.py, line 260

    result = subprocess.run(

    render-mcp/src/render_mcp/engine.py, line 159

    result = subprocess.run(

    Show more

    render-mcp/src/render_mcp/engine.py, line 288

    result = subprocess.run(

    render-mcp/src/render_mcp/server.py, line 203

    r = subprocess.run(

    synth-mcp/src/synth_mcp/server.py, line 190

    r = subprocess.run(

    render-mcp/docs/architecture.md, line 234

    subprocess.run([mscore_cmd, "-o", output_path, tmp_input_mxl])

    render-mcp/docs/architecture.md, line 237

    subprocess.run([mscore_cmd, "-o", tmp_out_base, tmp_input_mxl, "-r", str(dpi)])

  • Install and update

    Serious

    install fetches a script from the network. The docs document an installer that pipes a download into a shell.

    INSTALL_REMOTE_SCRIPT INSTALL_DOCUMENTED_INSTALLER

    comparer-mcp/install.sh, line 33

    curl -LsSf https://astral.sh/uv/install.sh | sh

    docs/SETUP_UX_PLAN.md, line 82

    2. Installs `uv` if missing (`curl -LsSf https://astral.sh/uv/install.sh | sh`)

    musicxml-abc-mcp/install.sh, line 33

    curl -LsSf https://astral.sh/uv/install.sh | sh

    Show more

    omr-mcp/install.sh, line 33

    curl -LsSf https://astral.sh/uv/install.sh | sh

    pitch-mcp/install.sh, line 21

    curl -LsSf https://astral.sh/uv/install.sh | sh

    render-mcp/install.sh, line 21

    curl -LsSf https://astral.sh/uv/install.sh | sh

    synth-mcp/install.sh, line 46

    curl -LsSf https://astral.sh/uv/install.sh | sh

    synth-mcp/install.sh, line 51

    curl -LsSf https://astral.sh/uv/install.sh | sh"

  • Network

    Concern

    can reach a host that is not written as a fixed address.

    NETWORK_NO_FIXED_HOST

    synth-mcp/install.sh, line 118

    if curl -L --progress-bar \

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_DOTENV

    .gitignore, line 33

    # Environment overrides

    .gitignore, line 34

    .env

  • Agent instructions

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Note

    a file was over the read cap and was not fully read.

    OBFUSCATION_FILE_OVER_READ_CAP

    comparer-mcp/uv.lock, line 1

    version = 1

    musicxml-abc-mcp/uv.lock, line 1

    version = 1

    omr-mcp/uv.lock, line 1

    version = 1

    Show more

    pitch-mcp/uv.lock, line 1

    version = 1

    pitch-mcp/tests/fixtures/soprano_phrase.wav, line 1

    RIFF�� WAVEfmt "VD�dataf� +Mw��'p�h�

    synth-mcp/uv.lock, line 1

    version = 1

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

Get the full report on this tool, £49

Note

Hygiene check of commit c4508cac83a9. requests shell access. The manifest names this permission. install fetches a script from the network. The docs document an installer that pipes a download into a shell. can reach a host that is not written as a fixed address. reads a credential or environment file. a file was over the read cap and was not fully read.

Date and source

Date checked:

View source

github.com

Commit graded: c4508cac83a9f0d9476409ce15a5c96d958a82b6

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen