Grades are a hygiene check, not a security guarantee.

MCP, MCP server

JustCall MCP Server

The JustCall Model Context Protocol (MCP) Server lets Large Language Models (LLMs) and AI agents make real-world voice calls and send SMS directly through JustCall’s APIs — securely, contextually, and programmatically.

Compatibility: Not stated.

Grade C

One Medium finding. Read the findings 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 7dbab92c5fee, unchanged since the check below.

INSTALL_LIFECYCLE_HOOK

Why this grade

  • INSTALL_LIFECYCLE_HOOK Medium

    A package install hook (preinstall, install, postinstall or prepare) runs a script.

    package.json, line 31 prepare

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

    Concern

    runs a script at install time.

    INSTALL_LIFECYCLE_HOOK

    package.json, line 31

    prepare

  • Network

    Concern

    can reach a host that is not written as a fixed address. can reach www.w3.org. The description does not name that host.

    NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST

    src/index.ts, line 32

    async fetch(request: Request, env: Env, ctx: ExecutionContext) {

    src/index.ts, line 38

    return JustCallMCP.serveSSE("/sse").fetch(request, env, ctx);

    src/index.ts, line 48

    return JustCallMCP.serve("/mcp").fetch(request, env, ctx);

    Show more

    src/ui/call-details/index.html, line 7

    <script type="module" crossorigin>function vC(e,t){for(var n=0;n<t.length;n++){const i=t[n];if(typeof i!="string"&&!Array.isArray(i)){for(const l in i)if(l!=="default"&&!(l in e)){

    src/ui/call-details/index.html, line 92

    `})]})})},P7=e=>m.jsx("svg",{viewBox:"0 0 18 14",xmlns:"http://www.w3.org/2000/svg",...e,children:m.jsx("path",{d:"M1.5 4.50002L4.83333 1.16669M4.83333 1.16669L8.16667 4.50002M4.83

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_ENV_READ SECRETS_PATH_DOTENV

    src/tools/utils.ts, line 74

    `${process.env.JUSTCALL_API_KEY}:${process.env.JUSTCALL_API_SECRET}`;

    .gitignore, line 11

    # Environment variables

    .gitignore, line 12

    .env

    Show more

    .gitignore, line 13

    .env.local

  • 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

    pnpm-lock.yaml, line 1

    lockfileVersion: '9.0'

    src/ui/call-details/index.html, line 1

    <!DOCTYPE html>

    src/ui/calls-list/index.html, line 1

    <!DOCTYPE html>

  • 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 7dbab92c5fee. runs a script at install time. can reach a host that is not written as a fixed address. can reach www.w3.org. The description does not name that host. 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: 7dbab92c5feee1e25a99bdec54bd967bcf0a2d54

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