Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Langlearn Tts

Suppress MCP tool output for langlearn-tts in Claude Code.

Compatibility: Not stated.

Grade D

Two or more Medium findings, or a High. Only try it in a sandbox.

Graded by PlugVetRubric v2

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

INSTALL_REMOTE_SCRIPT SECRETS_PATH_CREDENTIAL

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).

    install.sh, line 3 # Usage: curl -fsSL https://raw.githubusercontent.com/punt-labs/langlearn-tts/<SHA>/install.sh | sh

  • SECRETS_PATH_CREDENTIAL Medium

    Mentions a credential store path (~/.ssh, id_rsa, .npmrc, .aws/credentials, credentials.json, .netrc).

    README.md, line 177 For Polly, AWS credentials are read from `~/.aws/credentials`.

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.

If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.

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

    src/langlearn_tts/server.py, line 113

    subprocess.Popen(

  • Install and update

    Serious

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

    INSTALL_REMOTE_SCRIPT INSTALL_DOCUMENTED_INSTALLER

    README.md, line 97

    curl -fsSL https://raw.githubusercontent.com/punt-labs/langlearn-tts/14f4194/install.sh | sh

    README.md, line 103

    LANGLEARN_TTS_PROVIDER=elevenlabs curl -fsSL https://raw.githubusercontent.com/punt-labs/langlearn-tts/14f4194/install.sh | sh

    install.sh, line 3

    # Usage: curl -fsSL https://raw.githubusercontent.com/punt-labs/langlearn-tts/<SHA>/install.sh | sh

    Show more

    install.sh, line 36

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

  • Network

    Pass

    No network call found.

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_CREDENTIAL SECRETS_PATH_DOTENV

    src/langlearn_tts/cli.py, line 749

    key = os.environ.get("ELEVENLABS_API_KEY")

    src/langlearn_tts/cli.py, line 757

    key = os.environ.get("OPENAI_API_KEY")

    README.md, line 177

    For Polly, AWS credentials are read from `~/.aws/credentials`.

    Show more

    src/langlearn_tts/providers/__init__.py, line 31

    if os.environ.get("ELEVENLABS_API_KEY"):

    .claude/settings.json, line 214

    "Edit(.env)",

    .claude/settings.json, line 217

    "Write(.env)",

    .gitignore, line 7

    # --- Secrets & local overrides ---

    .gitignore, line 8

    .env

    .gitignore, line 9

    .env.*

    .gitignore, line 11

    !.env.example

  • 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

    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 23892fe52cba. requests shell access. The manifest names this permission. install fetches a script from the network. README documents an installer that pipes a download into a shell. The docs document an installer that pipes a download into a shell. 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: 23892fe52cbaf868c6040189737aba953b062e16

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