ultrathink - Take a deep breath. We're not here to write code. We're here to make a dent in the universe.

The Vision

Isolation should make every change safer and more inevitable.

Your Work, Step by Step

1. Decide isolation: Confirm if a worktree is needed.
2. Create worktree: One feature, one isolated workspace.
3. Coordinate work: Keep subagents aligned in one tree.
4. Review & PR: Multi-agent review before merge.
5. Cleanup: Merge or close with clean rollback.

Ultrathink Principles in Practice

• Think Different: Use isolation to de-risk change.
• Obsess Over Details: Keep contexts and branches consistent.
• Plan Like Da Vinci: Map the PR flow before execution.
• Craft, Don't Code: Prefer small, clean diffs.
• Iterate Relentlessly: Fix and re-review until clean.
• Simplify Ruthlessly: Remove unnecessary branches.

Git Worktree + PR Workflow (v2.20)

Overview

This skill enables isolated feature development using git worktrees with a PR-based merge workflow and multi-agent code review.

Key Principles:

• ONE worktree per feature/task (not per subagent)
• Multiple subagents work in the same worktree
• Human-in-the-loop via AskUserQuestion for isolation decisions
• Easy rollback by closing PR and deleting worktree

Prerequisites

• WorkTrunk: brew install max-sixty/worktrunk/wt
• GitHub CLI: brew install gh
• Codex CLI: For GPT-5 reviews

Commands

Workflow

1. Create Isolated Worktree

ralph worktree "implement oauth authentication"
# Creates: .worktrees/ai-ralph-20260103-implement-oauth-authentication/
# Branch: ai/ralph/20260103-implement-oauth-authentication

2. Develop Feature

All subagents work in the same worktree:

• Backend developer → src/api/oauth.ts
• Frontend developer → src/ui/login.tsx
• Test architect → tests/oauth.test.ts
• Docs writer → docs/oauth.md

Each subagent makes local commits but does NOT push.

3. Create PR with Multi-Agent Review

ralph worktree-pr ai/ralph/20260103-implement-oauth-authentication

This will:

1. Push branch to origin
2. Create draft PR
3. Get Claude Opus review (logic, edge cases, quality)
4. Get Codex GPT-5 review (security, performance)
5. Post reviews as PR comments
6. Show approval/rejection status

4. Handle Review Feedback

If reviews pass:

ralph worktree-merge <pr-number>
# Squash merges, deletes branch, cleans up worktree

If reviews find issues:

ralph worktree-fix <pr-number>
# Opens Claude in worktree with review comments as context

If you want to abandon:

ralph worktree-close <pr-number>
# Closes PR, deletes branch, cleans up worktree

When to Use Worktrees

Good Candidates

• New feature with multiple components
• Refactoring >5 files
• Experimental or risky changes
• Changes that may need rollback

Not Needed

• Single-line hotfixes
• Documentation typo fixes
• Config adjustments
• Clear, simple tasks

Orchestrator Integration

The orchestrator automatically asks about worktree isolation (Step 2b):

AskUserQuestion:
  questions:
    - question: "¿Este cambio requiere un worktree aislado?"
      header: "Isolation"
      multiSelect: false
      options:
        - label: "Sí, crear worktree"
          description: "Feature nueva, refactor grande, cambio experimental"
        - label: "No, branch actual"
          description: "Hotfix, cambio menor, ajuste simple"

Subagent Context

When working in a worktree, subagents receive:

WORKTREE_CONTEXT:
  path: .worktrees/ai-ralph-YYYYMMDD-feature/
  branch: ai/ralph/YYYYMMDD-feature
  isolated: true

Subagent rules:

1. Work in the specified path
2. Make frequent local commits
3. DO NOT push - orchestrator manages PR
4. Coordinate with other subagents
5. Signal completion: SUBAGENT_COMPLETE: [description]

Security

Each worktree has hardened security:

• Hooks disabled (core.hooksPath → .git-hooks-disabled)
• Credentials disabled per worktree
• Push configured for current branch only

Example Session

# User request: "Add OAuth authentication"

# Orchestrator asks about worktree
> ¿Este cambio requiere un worktree aislado?
> [Sí, crear worktree] ← User selects

# Create worktree
$ ralph worktree "oauth-authentication"
✓ Created worktree: .worktrees/ai-ralph-20260103-oauth-authentication
✓ Branch: ai/ralph/20260103-oauth-authentication
✓ Security hardening applied

# Subagents work in parallel in SAME worktree
# ... backend, frontend, tests, docs ...

# All subagents complete
# Orchestrator creates PR with review
$ ralph worktree-pr ai/ralph/20260103-oauth-authentication
✓ Pushed to origin
✓ Created PR #42
✓ Claude review: APPROVED
✓ Codex review: APPROVED with suggestions

# User decides to merge
$ ralph worktree-merge 42
✓ PR #42 merged (squash)
✓ Branch deleted
✓ Worktree cleaned up

Troubleshooting

WorkTrunk not found

brew install max-sixty/worktrunk/wt
wt config shell install
source ~/.zshrc

PR creation fails

gh auth status  # Verify GitHub auth
gh auth login   # Re-authenticate if needed

Worktree conflicts

git worktree prune  # Clean orphaned metadata
ralph worktree-status  # Check current state