Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Slack Mcp

Slack Mcp, an MCP server listed in the PlugVet directory.

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.

NETWORK_NO_FIXED_HOST SECRETS_PATH_DOTENV SECRETS_ENV_READ OBFUSCATION_FILE_OVER_READ_CAP

Why this grade

  • NETWORK_NO_FIXED_HOST Low

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

    src/slack_mcp/tools/undocumented.py, line 466 resp = await http.get(image_url)

  • SECRETS_PATH_DOTENV Low

    Mentions a .env file.

    CLAUDE.md, line 7 mise run test:integration # integration tests (requires .env tokens)

  • SECRETS_ENV_READ Note

    Reads an environment variable whose name contains KEY, SECRET, TOKEN, PASSWORD or CREDENTIAL.

    src/slack_mcp/client.py, line 54 self.xoxp_token = os.environ.get("SLACK_XOXP_TOKEN", "")

  • OBFUSCATION_FILE_OVER_READ_CAP Note

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

    uv.lock, line 1 version = 1

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

    Pass

    No shell or command execution found, and no extra permission was declared.

  • 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/slack_mcp/tools/undocumented.py, line 466

    resp = await http.get(image_url)

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_DOTENV

    CLAUDE.md, line 7

    mise run test:integration # integration tests (requires .env tokens)

    src/slack_mcp/client.py, line 13

    # a stray local .env. Test-workspace pinning lives in the test layer instead

    src/slack_mcp/client.py, line 54

    self.xoxp_token = os.environ.get("SLACK_XOXP_TOKEN", "")

    Show more

    src/slack_mcp/client.py, line 55

    self.xoxc_token = os.environ.get("SLACK_XOXC_TOKEN", "")

    src/slack_mcp/client.py, line 56

    self.xoxd_token = os.environ.get("SLACK_XOXD_TOKEN", "")

    src/slack_mcp/server.py, line 7

    # a stray local .env. Test-workspace pinning lives in the test layer instead

    src/slack_mcp/server.py, line 52

    _token = os.environ.get("SLACK_XOXP_TOKEN", "")

    .gitignore, line 1

    .env

    CLAUDE.md, line 16

    - ⚠️ **Integration tests hit a LIVE Slack workspace and mutate it** (create channels, messages, reminders, files, user groups, …) as the owner of the tokens in `.env`. There is NO

    CLAUDE.md, line 17

    - `.env` is authoritative **for the tokens it defines**: `load_dotenv(override=True)` overrides inherited/exported values, but only per-variable. Define all of `SLACK_XOXP_TOKEN`/`

    CLAUDE.md, line 18

    - Run integration tests after adding or modifying any tool - but only once `.env` is confirmed to point at the throwaway workspace.

    CONTRIBUTING.md, line 20

    mise run test:integration # integration tests (requires .env tokens)

  • 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 7abc8af00ecf. 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: 7abc8af00ecfdc39a456aa12617dce0ffe2786cc

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