jcas-mcp

jcas-mcp is an MCP server for Claude Code, Codex, Cursor, Gemini CLI, OpenCode from johnnyclem/JCAppleScript. Its token cost is not measured, scanned A, original, MIT.

An MCP server, a program that gives an AI agent extra tools, distributed as a downloadable package from GitHub.

In plain words
What is it for?
Use it when an agent needs the tools exposed by jcas-mcp in a JCAppleScript setup.
Why use it?
It provides the jcas-mcp integration, but it requires two environment settings before it can run.

MCP server for Claude CodeCodexCursorGemini CLIOpenCode

Written for no agent in particular: it speaks MCP, so any client can run it.

Good fit Use it when an agent needs the tools exposed by jcas-mcp in a JCAppleScript setup.

Compare 6 mcp servers from other repositories ↓
Install with agentmods
npx agentmods add mcp/johnnyclem/jcapplescript/jcas-mcp

Installing this writes the configuration, not the program: `https://github.com/johnnyclem/JCAppleScript/releases/download/v2.0.0/jcas-mcp.mcpb` has to be on your PATH already, or the server will not start.

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/johnnyclem/JCAppleScript

Installing this writes the configuration, not the program: `https://github.com/johnnyclem/JCAppleScript/releases/download/v2.0.0/jcas-mcp.mcpb` has to be on your PATH already, or the server will not start.

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for jcas-mcp

README.md
[![agentmods](https://agentmods.dev/badge/mcp/johnnyclem/jcapplescript/jcas-mcp/github.svg)](https://agentmods.dev/mcp/johnnyclem/jcapplescript/jcas-mcp)
Your own site
<a href="https://agentmods.dev/mcp/johnnyclem/jcapplescript/jcas-mcp"><img src="https://agentmods.dev/badge/mcp/johnnyclem/jcapplescript/jcas-mcp/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for jcas-mcp

Your own site · 80×15
<a href="https://agentmods.dev/mcp/johnnyclem/jcapplescript/jcas-mcp"><img src="https://agentmods.dev/badge/mcp/johnnyclem/jcapplescript/jcas-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

jcas-mcp scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

server.json · 10 lines

What it actually says

{
  "jcas-mcp": {
    "command": "https://github.com/johnnyclem/JCAppleScript/releases/download/v2.0.0/jcas-mcp.mcpb",
    "args": [],
    "env": {
      "JCAS_SAFE_MODE": "",
      "JCAS_APP_MANIFESTS": ""
    }
  }
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 10 lines scan A 72979dc0d56f

Subscribe to this mod's changes

jcas-mcp is an MCP server published in the GitHub repository johnnyclem/JCAppleScript (28 stars, last pushed 1mo ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.