project-setup-skills — Claude Code Plugin

Plugins

Two skills. Both permanent.

Install once. Caveman Ultra activates globally every session. Project config writes to all three AI agent instruction files automatically.

🦴

caveman-ultra-setup

v1.0

Writes a global SessionStart hook into ~/.claude/settings.json. Activates Caveman Ultra mode automatically in every future Claude session, across all projects.

Global hook Auto-activate Python script

📋

claude-md-setup

v1.0

Creates or updates CLAUDE.md, AGENTS.md, and .github/copilot-instructions.md in any project root with three standard sections: ruthless mentor mode, caveman ultra, and skill usage rules. Smart merge — never overwrites existing content.

Smart merge 3 files Per-project Template-based

Installation

Up and running in 4 steps

Requires Claude Code with plugin support, Python 3, and a bash shell.

1

Add marketplace and install plugins

Register the source, then install both plugins. Each downloads and registers its skills on the next session start.

bash

claude plugin marketplace add bighadoop-rnd/project-setup-skills
claude plugin install caveman-ultra-setup@project-setup-skills
claude plugin install claude-md-setup@project-setup-skills

2

Restart Claude Code

Close and reopen Claude Code. Plugin hooks register on the next session start.

A full restart is required for plugin hooks to activate.

3

Invoke a skill

Use a natural trigger phrase or slash command. Claude runs the skill automatically.

Say any of these in a Claude session:

trigger phrases

set up caveman ultra globally
/caveman-ultra-setup

Claude runs the install script, writes the SessionStart hook, and caveman ultra is active in every future session.

4

Verify the caveman hook

Run this one-liner to confirm the hook was written to your global settings.

python3

python3 -c "
import json; from pathlib import Path
s = json.load(open(Path.home() / '.claude/settings.json'))
hooks = s.get('hooks', {}).get('SessionStart', [])
found = any('CAVEMAN ULTRA' in h.get('command','')
            for e in hooks for h in e.get('hooks',[]))
print('Hook installed:', found)
"

Expected: Hook installed: True

How It Works

Under the hood

Two separate flows — one per plugin.

🦴 Caveman Ultra

SessionStart fires when Claude Code opens

↓

Harness runs install-caveman-hook.py

↓

Outputs additionalContext JSON to stdout

↓

Caveman ultra rules injected into model context. Every response: ultra mode.

Say stop caveman or normal mode to deactivate.

📋 Project Config Setup

User triggers skill: "set up CLAUDE.md"

↓

Skill checks each target file: CLAUDE.md, AGENTS.md, .github/copilot-instructions.md

↓

Smart merge per file — appends only missing sections, preserves existing content

↓

All 3 files written with identical content: mentor mode, caveman ultra, and skill usage sections.

Never touches ~/.claude/CLAUDE.md — only the current project root.

CLI Reference

Plugin management

All plugin management via the claude plugin CLI. Click any command to copy.

Install

claude plugin marketplace add bighadoop-rnd/project-setup-skills Add marketplace copy

claude plugin install caveman-ultra-setup@project-setup-skills Install caveman plugin copy

claude plugin install claude-md-setup@project-setup-skills Install CLAUDE.md plugin copy

Update

claude plugin update caveman-ultra-setup@project-setup-skills Update caveman plugin copy

claude plugin update claude-md-setup@project-setup-skills Update CLAUDE.md plugin copy

claude plugin list List installed plugins copy

Enable / Disable / Uninstall

claude plugin disable caveman-ultra-setup@project-setup-skills Disable caveman plugin copy

claude plugin enable caveman-ultra-setup@project-setup-skills Re-enable caveman plugin copy

claude plugin uninstall caveman-ultra-setup@project-setup-skills Uninstall caveman plugin copy

claude plugin uninstall claude-md-setup@project-setup-skills Uninstall claude-md-setup plugin copy

Requirements

Claude Code

CLI or desktop app with plugin support

Python 3

For the caveman hook install script

Bash shell

Git Bash on Windows works fine

Every session. Zero setup.