The Overnight AI Coding Starter Kit

Claude Code + Ralph Plugin Setup Guide

What is this?

A complete guide to setting up autonomous AI coding — where you give AI a task before bed and wake up to shipped code.

This kit covers:

✅ What Claude Code & Ralph Plugin actually do

✅ Step-by-step installation

✅ Best prompts for overnight sessions

✅ Pro tips & best practices

✅ Resources & community links

🧠 The Concept (60-Second Explainer)

Claude Code = Anthropic's AI coding tool that runs in your terminal. It reads your codebase, writes code, runs tests, and handles git — all through natural language. It's not a chatbot. It actually builds.

Ralph Plugin (aka Ralph Wiggum / Ralph Loop) = A plugin that keeps Claude in a loop until the job is actually DONE. No early exits. No "good enough." It keeps iterating until your success criteria are met.

The combo = You define a task + success criteria → AI works on it for hours → You wake up to finished, tested, committed code.

The name comes from the Simpsons character's persistence — it just keeps going no matter what.

📦 What You Need

Requirement	Details
Anthropic Account	Free tier or API key
Terminal	Mac/Linux terminal or Windows WSL
Node.js or Python	For installation
A Code Project	Something to work on (ideally with Git)

⚙️ Installation (Step-by-Step)

Step 1: Sign Up for Anthropic & Get API Key

Go to anthropic.com and create an account

Generate an API key in your dashboard (under API Keys)

Copy it — you'll need it for authentication

Step 2: Install Claude Code

Open your terminal and run:

# Via pip
pip install claude-code

# Or via npm
npm install -g @anthropic-ai/claude-code

Verify installation:

claude --version

Authenticate:

claude login

Paste your API key when prompted.

Or set as environment variable:

export ANTHROPIC_API_KEY=your-key-here

Step 3: Install Ralph Plugin

Option A: Official Plugin (Easiest)

Inside Claude Code terminal, run:

/plugin install ralph-loop@claude-plugins-official

Verify it's installed:

/plugin installed

Option B: Bash Loop (More Control)

For better context management, some devs prefer a simple bash script:

Create a file called loop.sh:

#!/bin/bash
while true; do
  cat PROMPT.md | claude
done

Make it executable:

chmod +x loop.sh

Then create a PROMPT.md file with your task and run ./loop.sh

Step 4: IDE Integration (Optional but Recommended)

For VS Code or Cursor:

Install "Claude Code" extension from marketplace

Open your project folder

Run claude in your repo folder

Link GitHub for repo access

🎯 How To Use Ralph

Basic Commands

Command	What It Does
`/ralph-loop "task"`	Start an autonomous loop
`--max-iterations 20`	Set max loops (safety limit)
`--completion-promise "DONE"`	The word that signals completion
`/cancel-ralph`	Stop the loop

Basic Example:

/ralph-loop "Build a user authentication system with email/password.

Requirements:
- Login & signup forms
- Password hashing
- Session management
- Tests passing

Output DONE when complete." --max-iterations 30 --completion-promise "DONE"

🌙 Best Prompts For Overnight Sessions

1. Feature Build

/ralph-loop "Build [FEATURE NAME].

Requirements:
- [Requirement 1]
- [Requirement 2]
- [Requirement 3]

Success criteria:
- All requirements implemented
- Tests passing
- No linter errors
- Code committed

Output DONE when complete." --max-iterations 40

2. Hello World API (Good First Test)

/ralph-loop "Build a Node.js API that returns 'Hello World'.

Steps:
- Create the server
- Test with curl
- Commit to Git

Output DONE when ready." --max-iterations 15

3. Bug Fix

/ralph-loop "Fix bug: [DESCRIPTION]

Steps:
1. Reproduce the bug
2. Identify root cause
3. Implement fix
4. Write regression test
5. Verify fix works

Output FIXED when complete." --max-iterations 25

4. Code Migration

/ralph-loop "Migrate all tests from Jest to Vitest.

Process:
- Update imports
- Adjust syntax differences
- Run tests after each file
- Fix any failures

Output MIGRATED when all tests pass." --max-iterations 50

💡 Best Practices

✅ DO:

Set clear exit conditions — Ralph needs to know when it's "done" (e.g., "Output 'DONE' only when all tests pass")

Always set max-iterations — Prevents infinite loops & runaway costs (start with 10-20)

Keep context under 50% — Avoids drift; use /clear for fresh starts between iterations

Use files as memory — Better than accumulated context

Start with smaller tasks — Test the workflow before big overnight runs

Use version control — So you can review/revert changes

Include "if stuck" instructions — Tell it what to do if blocked

Use TDD (Test-Driven Development) — Makes verifiable exit conditions easier

❌ DON'T:

Don't use Ralph until manual Claude sessions work for you

Don't leave it running with no iteration limit

Don't expect perfect on first try (that's the point of the loop)

Don't use for tasks without clear completion criteria

Don't deploy directly to production without review

🔄 Recommended Workflow (3 Phases)

Plan Mode — Chat with Claude manually first. Define the task, break it down, agree on approach.

Auto-Loop Mode — Run Ralph overnight with clear success criteria.

Review Mode — Wake up, review commits, test manually, deploy.

Think of yourself as a manager reviewing an employee's overnight work — not doing the work yourself.

🔒 Permission Tip (Use Carefully)

If you trust the setup, you can skip permission prompts:

claude --dangerously-skip-permissions

⚠️ Only use this in version-controlled projects where you can review/undo changes.

💰 Cost Awareness

Ralph loops use API calls. Monitor your usage:

Set reasonable -max-iterations (start with 10-20)

Use /clear between sessions to save tokens

Start small to estimate costs before big runs

Consider rate limits (e.g., 100 calls/hr)

Typical costs: ~$0.50 - $5 per overnight run depending on complexity.

🔌 Advanced: Useful Plugins to Add

Plugin	What It Does
Firecrawl	Pull web data into your project
Playwright	Automated browser testing
MCP Servers	Notifications when tasks complete

📚 Resources & Links

Official & Core Guides

Anthropic Claude Code Docs — Official setup

Ralph Wiggum Guide (GitHub) — Plugin vs. bash comparison

Awesome Claude - Ralph Technique — Quick start snippets

X/Twitter: #ClaudeCode — Latest tips from devs

✅ Your First Overnight Session (Checklist)

Anthropic account created & API key ready

Claude Code installed & authenticated

Ralph plugin installed (or bash loop created)

Project has version control (git init)

Small test task defined with clear exit condition

Max iterations set (start with 15-20)

Run the command

Go to sleep 😴

Wake up, review the commits ☕

Celebrate 🎉

🚀 Start Here (Recommended First Task)

/ralph-loop "Create a simple Express.js API with one endpoint that returns { status: 'ok' }.

Steps:
1. Initialize project
2. Create server.js
3. Test endpoint works
4. Commit to git

Output DONE when the endpoint returns { status: 'ok' }." --max-iterations 15

If this works, you're ready for bigger overnight builds.