Grades are a hygiene check, not a security guarantee.

MCP, MCP server

io.github.NtrpyDev/proton-workflow-connector

Proton Workflow Connector (PWC) is a self-hosted MCP connector for reading, sending, organizing, and automating Proton Mail through Proton Mail Bridge.

Compatibility: Not stated.

Grade B

Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.

Graded by PlugVetRubric v2

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

Rescanned at commit 6cf73f47287e, unchanged since the check below.

NETWORK_NO_FIXED_HOST SECRETS_PATH_DOTENV PERMISSION_SHELL_DECLARED

Why this grade

  • NETWORK_NO_FIXED_HOST Low

    Makes a network call whose host is not written as a fixed address.

    src/proton_mail_mcp/auth.py, line 63 response = httpx.get(url, timeout=10.0, headers={"User-Agent": USER_AGENT})

  • SECRETS_PATH_DOTENV Low

    Mentions a .env file.

    src/proton_mail_mcp/server.py, line 1000 parser.add_argument("--env-file", help="Optional .env file to load before reading settings.")

  • PERMISSION_SHELL_DECLARED Note

    Runs shell commands, and the manifest or description says so.

    src/proton_mail_mcp/watch.py, line 364 proc = subprocess.run(list(argv), input=body, capture_output=True, timeout=timeout) # noqa: S603

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

    src/proton_mail_mcp/watch.py, line 364

    proc = subprocess.run(list(argv), input=body, capture_output=True, timeout=timeout) # noqa: S603

  • Install and update

    Pass

    No install-time script found, and dependencies are pinned or absent.

  • Network

    Concern

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

    NETWORK_NO_FIXED_HOST

    src/proton_mail_mcp/auth.py, line 63

    response = httpx.get(url, timeout=10.0, headers={"User-Agent": USER_AGENT})

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_DOTENV

    src/proton_mail_mcp/server.py, line 1000

    parser.add_argument("--env-file", help="Optional .env file to load before reading settings.")

    src/proton_mail_mcp/watch.py, line 988

    parser.add_argument("--env-file", help="Optional .env file to load before reading settings.")

    .env.example, line 1

    # Copy to .env for local testing. Do not commit .env.

    Show more

    .gitignore, line 15

    # Local secrets and private config

    .gitignore, line 16

    .env

    .gitignore, line 18

    !.env.example

    README.md, line 66

    cp .env.example ~/.config/proton-workflow-connector/env

    SECURITY.md, line 19

    - Keep `.env` files outside git and chmod them to user-only access.

  • Agent instructions

    Pass

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

  • Obfuscation

    Pass

    No encoded or minified payload found.

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit 6cf73f47287e. requests shell access. The manifest names this permission. can reach a host that is not written as a fixed address. reads a credential or environment file.

Date and source

Date checked:

View source

github.com

Commit graded: 6cf73f47287e91dc8712aa44daa34d4928105691

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Read how this letter is chosen