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JCAppleScript

io.github.johnnyclem/jcas-mcp

Source code

About JCAppleScript

JCAppleScript is an MCP server published by the GitHub account johnnyclem. Control macOS apps via AppleScript/JXA: sanitized commands for Messages, Mail, Finder, and more.

It runs on your own machine: your AI client starts it from the MCP bundle package jcas-mcp.mcpb at version 2.0.0.

It asks for no keys or passwords.

Version 2.0.0 was published on 28 August 2026, and the source code is public, so you can read it before installing.

Written from the registry entry. 8 automated checks on the registry entry and the package code: 6 pass, 0 warn, 0 fail, 2 info. How we check.

What it asks for

VariableRequiredSecretDescription
JCAS_SAFE_MODENoNoSet to 1 to disable tools that execute arbitrary code (execute_applescript, execute_jxa, tell_application) and registry commands flagged dangerous.
JCAS_APP_MANIFESTSNoNoColon-separated list of JSON manifest files with additional community app definitions to load at startup.

Checks

CheckResultDetail
Source repository linkedPasshttps://github.com/johnnyclem/JCAppleScript
Version pinnedPassEvery package has an explicit version
Secrets requestedInfoAsks for no secrets
Known package registryPassAll packages come from npm, PyPI, OCI, NuGet or MCPB
Namespace ownershipInfoName verified via GitHub account johnnyclem
Registry text aimed at the AIPassDescription and settings contain no hidden characters or instructions to the AI
Code red flagsPassRead 1 files in the bundle: no obfuscation, encoded execution, credential reads or data-collection endpoints found
Text aimed at the AIPassNo hidden characters or instructions to the AI in 1 files, including comments and the README

Popularity & health: 52 / 100

Worked out from public numbers and our own checks, not from user reviews or ratings. It says how used and how looked-after a server is, not whether it is safe.

Popularity7 / 40

28 GitHub stars, no download count, 0 Hacker News posts (0 points). Best two of the three, each on a log scale.

Activity17 / 25

Last push 2026-08-29, last release 2026-08-28, 8 commits in 90 days.

Issue health8 / 15

0 closed of 0 issues, too few to judge. No data, so half marks.

Our checks20 / 20

0 warnings, each costing a fifth.

4 forks, 4 merged pull requests. Sources: GitHub, npm, PyPI (pypistats.org) and Hacker News (Algolia), fetched 2026-10-31.

What people say

No Hacker News threads link to its source code.

Look further: search Reddit, search Hacker News, read its GitHub issues. These are not reviews we checked.

Facts

Registry nameio.github.johnnyclem/jcas-mcp
PublisherGitHub account johnnyclem
How the name is verifiedName verified via GitHub account johnnyclem. The registry ties the name prefix to that account or domain; it does not check the code.
TypeLocal: runs on your machine from a package
Packagesmcpb https://github.com/johnnyclem/JCAppleScript/releases/download/v2.0.0/jcas-mcp.mcpb 2.0.0 (stdio)
Version2.0.0
Published
Last updated
Source repositoryhttps://github.com/johnnyclem/JCAppleScript
Websitehttps://github.com/johnnyclem/JCAppleScript
CategoryEmail & messaging (assigned by keyword rule, not by hand)

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