Grades are a hygiene check, not a security guarantee.

MCP, MCP server

cnvs.app

Real-time collaborative whiteboard — AI agents and humans edit the same board live over MCP.

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 dde85bff2619, unchanged since the check below.

NETWORK_NO_FIXED_HOST

Why this grade

  • NETWORK_NO_FIXED_HOST Low

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

    cnvs-whiteboard/SKILL.md, line 28 curl -s -X POST https://cnvs.app/api/boards

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

    cnvs-whiteboard/SKILL.md, line 28

    curl -s -X POST https://cnvs.app/api/boards

    cnvs-whiteboard/SKILL.md, line 132

    curl -s "https://cnvs.app/svg-preview/<id>" -o /tmp/board.svg

    cnvs-whiteboard/SKILL.md, line 148

    curl -s "https://cnvs.app/api/boards/<id>/wait?timeout_ms=25000"

    Show more

    cnvs-whiteboard/SKILL.md, line 162

    curl -si https://cnvs.app/json/<id> | sed -n '/^etag:/p;/^$/q'

    cnvs-whiteboard/SKILL.md, line 165

    curl -si -H 'If-None-Match: W/"<boardId>-<ts>-<counts>"' https://cnvs.app/json/<id>

    cnvs-whiteboard/SKILL.md, line 172

    curl -s -X POST https://cnvs.app/api/boards/<id>/texts \

    mcp-listen/scripts/listen.mjs, line 280

    const res = await fetch(mcpUrl, {

    mcp-listen/scripts/listen.mjs, line 416

    await fetch(mcpUrl, { method: "DELETE", headers: baseHeaders(), signal: AbortSignal.timeout(3000) });

    mcp-listen/scripts/listen.mjs, line 445

    res = await fetch(mcpUrl, {

    cnvs-whiteboard/SKILL.md, line 21

    > **Access locks.** A board can OPTIONALLY be PIN-locked (8 chars, a-z0-9; legacy boards may carry a 6-char key). Two modes: `write` (anyone reads, only key-holders write) and `all

  • 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.

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Note

Hygiene check of commit dde85bff2619. can reach a host that is not written as a fixed address.

Date and source

Date checked:

View source

github.com

Commit graded: dde85bff2619cb564889cdbd00a497da67af2f82

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