Ralphy & Ralph Wiggum Technique

Ralphy is an autonomous AI coding orchestrator that runs agents on tasks until done. Built on Geoffrey Huntley's Ralph Wiggum technique - a continuous loop methodology where AI agents iterate until completion.

Quick Reference

# Single task
ralphy "add dark mode"

# From PRD/YAML
ralphy --prd PRD.md
ralphy --yaml tasks.yaml

# Parallel execution
ralphy --parallel --max-parallel 5

# With branches and PRs
ralphy --branch-per-task --create-pr

Core Concepts

The Ralph Wiggum Technique

The foundational principle: run an AI agent in a loop until the job is done.

# Minimal form
while :; do cat PROMPT.md | claude ; done

Key insight: Failures inform improvements. When Ralph fails, tune the prompts like a guitar - add specific guidance based on observed failure patterns.

Three-Phase Architecture

1. Requirements Definition: Discuss project, identify Jobs to Be Done (JTBD), break into topics
2. Planning Loop: Gap analysis between specs and code, generate IMPLEMENTATION_PLAN.md
3. Building Loop: Implement tasks, validate with tests, commit on success

Ralphy CLI Usage

Task Sources

Markdown PRD (checkbox format):

## Tasks
- [ ] create auth system
- [ ] add dashboard
- [x] completed task (skipped)

YAML format:

tasks:
  - title: create auth
    completed: false
    parallel_group: 1
  - title: add dashboard
    completed: false
    parallel_group: 2

GitHub Issues:

ralphy --github owner/repo --github-label "ready"

Parallel Execution

Run multiple agents simultaneously with isolation:

ralphy --parallel              # 3 agents default
ralphy --parallel --max-parallel 5
ralphy --parallel --sandbox    # Lightweight sandboxes for large repos

Each agent gets:

• Isolated worktree or sandbox
• Unique branch: ralphy/agent-N-task-slug
• Independent execution context

Parallel Groups in YAML control execution order:

tasks:
  - title: Create User model
    parallel_group: 1
  - title: Create Post model
    parallel_group: 1    # Runs with above
  - title: Add relationships
    parallel_group: 2    # Waits for group 1

Branch Workflow

ralphy --branch-per-task           # One branch per task
ralphy --branch-per-task --create-pr   # Plus pull requests
ralphy --branch-per-task --draft-pr    # Draft PRs
ralphy --base-branch main          # Branch from specific base

Engine Selection

ralphy "task"                      # Claude Code (default)
ralphy --opencode "task"           # OpenCode
ralphy --cursor "task"             # Cursor
ralphy --codex "task"              # Codex
ralphy --qwen "task"               # Qwen-Code
ralphy --copilot "task"            # GitHub Copilot

Model override:

ralphy --model sonnet "task"
ralphy --sonnet "task"             # Shortcut

Pass args to engine:

ralphy --claude "task" -- --no-permissions-prompt

Project Configuration

Initialize with auto-detection:

ralphy --init

Creates .ralphy/config.yaml:

project:
  name: "my-app"
  language: "TypeScript"
  framework: "Next.js"

commands:
  test: "npm test"
  lint: "npm run lint"
  build: "npm run build"

rules:
  - "use server actions not API routes"
  - "follow error pattern in src/utils/errors.ts"

boundaries:
  never_touch:
    - "src/legacy/**"
    - "*.lock"

capabilities:
  browser: "auto"

notifications:
  discord_webhook: "https://discord.com/..."
  slack_webhook: "https://hooks.slack.com/..."

Add rules dynamically:

ralphy --add-rule "always use TypeScript strict mode"

CLI Flags Reference

| Flag | Purpose | |------|---------| | --prd PATH | Task file/folder (default: PRD.md) | | --yaml FILE | YAML task file | | --github REPO | Use GitHub issues | | --parallel | Run parallel agents | | --max-parallel N | Max agents (default: 3) | | --sandbox | Lightweight sandboxes vs worktrees | | --branch-per-task | One branch per task | | --create-pr | Create pull requests | | --draft-pr | Create draft PRs | | --no-merge | Skip auto-merge in parallel | | --no-tests | Skip tests | | --no-lint | Skip linting | | --fast | Skip tests and lint | | --no-commit | Don't auto-commit | | --max-iterations N | Stop after N tasks | | --max-retries N | Retries per task (default: 3) | | --dry-run | Preview only | | --browser | Enable browser automation | | -v, --verbose | Debug output |

The Ralph Loop Pattern

For advanced usage implementing the full Ralph Wiggum technique:

See references/ralph_loop_pattern.md for:

• Complete file structure
• PROMPT_plan.md and PROMPT_build.md templates
• Context management strategies
• Backpressure mechanisms
• Plan regeneration triggers

Security Considerations

Critical: Running with --dangerously-skip-permissions requires sandboxing.

• Always set --max-iterations (e.g., 20-50) to prevent runaway costs
• Run in sandboxed environments (Docker, Fly Sprites, E2B)
• Use minimum viable API key access
• Escape hatches: Ctrl+C stops loop, git reset --hard reverts

Best Practices

1. Start with clear specs: Well-defined PRD items lead to better outcomes
2. Use parallel groups: Organize dependent tasks to run efficiently
3. Set boundaries: Protect critical files in config
4. Add project rules: Guide consistent patterns
5. Monitor iterations: Watch for loops that aren't progressing
6. Iterate on prompts: When Ralph fails, tune the guidance

Troubleshooting

Agent stuck in loop: Check if task is too vague. Add specific acceptance criteria.

Merge conflicts in parallel: Use --no-merge and resolve manually, or let AI resolve.

Rate limits: Ralphy detects and defers tasks on quota errors.

Tests failing: Ensure commands.test in config matches your test runner.