What is mac-set-up CLAUDE.md?

Instructions for a macOS setup tool that installs development software and configures system preferences through shell scripts.

They help install Homebrew, command-line tools, languages, editors, browsers, terminals, Git, Zsh, and other development environment components.

They show how the installer coordinates many setup steps and clarify that the project has no automated test suite.

How ben196888/mac-set-up configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to ben196888/mac-set-up. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/ben196888/mac-set-up/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/ben196888/mac-set-up

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/ben196888/mac-set-up/claude-md/github.svg)](https://agentmods.dev/instructions/ben196888/mac-set-up/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/ben196888/mac-set-up/claude-md"><img src="https://agentmods.dev/badge/instructions/ben196888/mac-set-up/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/ben196888/mac-set-up/claude-md"><img src="https://agentmods.dev/badge/instructions/ben196888/mac-set-up/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 768 This file is loaded in full into every session.

When invoked 768 The same file — it is already loaded in full.

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.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00768	$0.00768
Opus 5.5	$0.00307	$0.00307
Sonnet 5.5	$0.00154	$0.00154
Haiku 4.5	$0.00077	$0.00077

Measured 2mo ago against content hash 69f29acf781a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mac-set-up CLAUDE.md 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 2mo 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.

CLAUDE.md · 44 lines

How it starts

The opening of the file, as written. The whole thing — 44 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What This Repo Does

This is a macOS development environment automation tool. Running ./install.sh sets up a complete dev environment in one shot: Homebrew, CLI tools, languages, IDEs, browsers, productivity apps, and system preferences.

Running

chmod +x install.sh
./install.sh

Individual scripts can also be run directly (e.g., ./languages/python.sh).

There are no build, lint, or test commands — this is a shell-based installer with no test suite.

Architecture

install.sh is the orchestrator — it sources or executes all other scripts in order:

essential.sh — Xcode CLT, Rosetta 2, Homebrew (with Apple Silicon vs Intel path detection via uname -m)
cli_tools.sh — OpenSSL, ripgrep, ast-grep, tree, ack
git/install.sh — Git config, ed25519 SSH key generation, GitHub CLI auth
zsh/install.sh — Zsh, Oh My Zsh, Starship prompt
terminal.sh — Ghostty terminal
languages/ — One script per language: javascript.sh (n + npm/yarn/pnpm/Deno), python.sh (pyenv + Poetry), rust.sh, go.sh, java.sh (SDKMAN), dotnet.sh, latex.sh
ides.sh — VS Code, Cursor
browsers.sh — Firefox (default), Chrome, Edge, DuckDuckGo
devtools.sh — OrbStack, Docker CLI, kubectl, Helm, Postman, Google Cloud SDK, ChatGPT, Claude Code, Playwright CLI 9.5. agentic/install.sh — Agentic instructions, skills, and MCP setup
tools.sh — AppCleaner, Spotify, Slack, Messenger, Signal, Discord, Rectangle
macos.sh — System defaults: Dock (auto-hide, left position), trackpad (tap-to-click, 3-finger drag, max speed), keyboard (Caps Lock→Control), input source shortcuts, Spotlight disabling

Key Conventions

Homebrew prefix: Always use the BREW_PREFIX variable (set in essential.sh based on arch) rather than hardcoding paths. /opt/homebrew on Apple Silicon, /usr/local on Intel.
Conditional tool init in .zshrc: All tool initializations (pyenv, Poetry, SDKMAN, etc.) are wrapped in command -v <tool> >/dev/null 2>&1 guards so the shell doesn't break if a tool isn't installed.
Config files live alongside installers: git/.gitconfig and git/.gitignore_global are copied by git/install.sh; zsh/.zshrc is managed by zsh/install.sh.
Agentic setup source of truth: Manage reusable agent setup through agentic/install.sh; configuration lives in agentic/agentic.conf.
Always use cp, never symlinks: All install scripts must copy files/directories to their destination (e.g. cp, cp -r). Never use ln -s or ln -sf. This is a hard rule — do not change it.

Read the full file on GitHub · 44 lines

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.

2mo ago First seen · 44 lines · 768 tokens per session scan A 69f29acf781a

Subscribe to this mod's changes

mac-set-up CLAUDE.md is an instructions file published in the GitHub repository ben196888/mac-set-up (11 stars, last pushed 3mo ago), licensed MIT. It adds 768 tokens to every session, about $0.0031 per session on Opus 5.5. 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.

macos macos-setup setup setup-macos setup-script

mac-set-up CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mac-set-up CLAUDE.mdben196888/mac-set-up	Instructions file	11	3mo ago	MIT	A	768	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,516	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	today	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,093	GitHub Copilot
vscode ai-customization.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	1,907	GitHub Copilot

mac-set-up: Instructions file for Claude Code