Grades are a hygiene check, not a security guarantee.

Claude Code, Skill

Mcp Builder

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools.

Compatibility: Claude Code.

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 dbd4588f9e10, unchanged since the check below.

NETWORK_NO_FIXED_HOST SECRETS_ENV_READ

Why this grade

  • NETWORK_NO_FIXED_HOST Low

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

    reference/node_mcp_server.md, line 474 const response = await axios.get(`${API_URL}/resource/${resourceId}`);

  • SECRETS_ENV_READ Note

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

    reference/node_mcp_server.md, line 707 if (!process.env.EXAMPLE_API_KEY) {

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

    reference/node_mcp_server.md, line 474

    const response = await axios.get(`${API_URL}/resource/${resourceId}`);

    reference/node_mcp_server.md, line 480

    return axios.get(`${API_URL}/resource/${resourceId}`)

    reference/python_mcp_server.md, line 260

    response = requests.get(f"{API_URL}/resource/{resource_id}") # Blocks

  • Secrets

    Note

    reads an environment variable.

    SECRETS_ENV_READ

    reference/node_mcp_server.md, line 707

    if (!process.env.EXAMPLE_API_KEY) {

    reference/node_mcp_server.md, line 719

    if (!process.env.EXAMPLE_API_KEY) {

  • 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 (skills/mcp-builder/LICENSE.txt).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit dbd4588f9e10. can reach a host that is not written as a fixed address. reads an environment variable.

Date and source

Date checked:

View source

github.com

Commit graded: dbd4588f9e1033efb41dad4bef2f7947c8993d44

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Read how this letter is chosen