Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Mcp Builder

A high-performance declarative compiler for the Model Context Protocol (MCP).

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.

NETWORK_HOST_FROM_INPUT

Why this grade

  • NETWORK_HOST_FROM_INPUT Medium

    A file takes a URL or endpoint as input and has no fixed host list.

    crates/mcp-builder-core/src/helpers.rs, line 436 let template = "curl -H 'Auth: {env:API_KEY}' -d '{user_id}' $BASE_URL $port";

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

    Serious

    accepts a host from input, with no fixed list in this file.

    NETWORK_HOST_FROM_INPUT

    crates/mcp-builder-core/src/helpers.rs, line 436

    let template = "curl -H 'Auth: {env:API_KEY}' -d '{user_id}' $BASE_URL $port";

    examples/network_bindings.kdl, line 7

    description "Zero-overhead WebSocket (bind:ws) and Raw TCP (bind:pipe) daemon bridge"

  • Secrets

    Pass

    No read of a credential file or secret environment variable found.

  • 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.

Get the full report on this tool, £49

Note

Hygiene check of commit f55dec056c65. accepts a host from input, with no fixed list in this file.

Date and source

Date checked:

View source

github.com

Commit graded: f55dec056c65bfb0072d3c4e3602de65363b51fa

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