Worktree Agents

Worktree Agent Management

This skill helps manage parallel development using git worktrees with AI coding agents. Each worktree is an isolated copy of the repo on a different branch, allowing multiple Claude Code agents to work simultaneously without conflicts.

When This Skill Activates

Trigger phrases:

• "spin up worktrees for X, Y, Z"
• "create worktrees and launch agents"
• "parallelize work on these features"
• "what's the status of my worktrees?"
• "launch agent in worktree X"
• "clean up merged worktrees"
• "clean up the X worktree"

Intent

The user wants to:

1. Create: Set up isolated worktrees for parallel feature development
2. Launch: Start Claude Code agents in those worktrees
3. Monitor: See what's running and what state each worktree is in
4. Cleanup: Remove worktrees after PRs are merged

CRITICAL: Directory Structure

All worktrees MUST be created in the worktrees/ subdirectory relative to the repo root.

repo-root/
├── worktrees/                          # All worktrees go here
│   ├── feature/auth/                   # Branch: feature/auth
│   ├── feature/payments/               # Branch: feature/payments
│   └── fix/login-bug/                  # Branch: fix/login-bug
├── src/
├── .claude/
└── ...

NEVER create worktrees as sibling directories (e.g., ../repo-feature-auth). This breaks:

• Status tracking
• Cleanup scripts
• Registry path matching

Correct:

git worktree add worktrees/feature/auth -b feature/auth

Wrong:

git worktree add ../repo-feature-auth -b feature/auth  # NO!

Architecture

.claude/skills/worktree-agents/
├── SKILL.md           # This file - instructions for Claude
├── config.json        # User preferences (terminal, shell, ports)
└── scripts/
    ├── launch-agent.sh    # Opens terminal with Claude Code
    ├── status.sh          # Shows worktree overview
    ├── register.sh        # Adds worktree to registry
    ├── unregister.sh      # Removes from registry
    └── cleanup.sh         # Full cleanup workflow

.claude/worktree-registry.json    # Tracks active worktrees (in repo root)

What You (Claude) Do vs What Scripts Do

IMPORTANT: Copy .agents/ Directory

Why: Uncommitted files (plans, RCA reports, PRPs) only exist in the source worktree. New worktrees start clean from git, so these files won't be there.

Always copy the .agents/ directory to new worktrees so the agent has access to:

• .agents/plans/ - Implementation plans to execute
• .agents/rca-reports/ - Root cause analysis reports
• .agents/PRPs/ - Product requirement plans

# After creating worktree, copy .agents/
cp -r .agents worktrees/<branch>/.agents

Port Allocation

Ports are assigned from the configured range (default: 8124-8128).

To find next available port:

1. Read .claude/worktree-registry.json
2. Get list of used ports: jq '.worktrees[].port' .claude/worktree-registry.json
3. Pick first unused port in range

Port range (from config.json):

• Default: 8124, 8125, 8126, 8127, 8128
• Maximum 5 concurrent worktrees

Workflows

1. Create Worktrees with Agents

User says: "Spin up worktrees for feature/auth and feature/payments"

You do:

1. For each branch:
   a. Find next available port (check registry)
   b. Create worktree:
      git worktree add worktrees/<branch> -b <branch>
   c. Copy .agents/ directory (plans, RCAs, PRPs):
      cp -r .agents worktrees/<branch>/.agents
   d. Install dependencies:
      cd worktrees/<branch> && npm install
   e. Run validation (optional but recommended):
      npm run type-check && npm run lint && npm test
   f. Register:
      scripts/register.sh <branch> worktrees/<branch> <port> "[task]"
   g. Launch agent:
      scripts/launch-agent.sh worktrees/<branch> "[task]"

2. Report summary to user

Example commands:

# Create worktrees
git worktree add worktrees/feature/auth -b feature/auth
git worktree add worktrees/feature/payments -b feature/payments

# Copy .agents/ directory (uncommitted plans, RCAs, etc.)
cp -r .agents worktrees/feature/auth/.agents
cp -r .agents worktrees/feature/payments/.agents

# Install deps
cd worktrees/feature/auth && npm install
cd worktrees/feature/payments && npm install

# Register (finds script in .claude/skills/worktree-agents/scripts/)
.claude/skills/worktree-agents/scripts/register.sh feature/auth worktrees/feature/auth 8124 "Implement OAuth"
.claude/skills/worktree-agents/scripts/register.sh feature/payments worktrees/feature/payments 8125 "Add Stripe"

# Launch agents
.claude/skills/worktree-agents/scripts/launch-agent.sh worktrees/feature/auth "Implement OAuth"
.claude/skills/worktree-agents/scripts/launch-agent.sh worktrees/feature/payments "Add Stripe"

2. Check Status

User says: "What's the status?" or "Show my worktrees"

You do:

.claude/skills/worktree-agents/scripts/status.sh

This shows:

• All registered worktrees
• Port assignments
• PR status (fetched from GitHub)
• When agent was launched
• Whether worktree directory exists

3. Launch Agent in Existing Worktree

User says: "Launch an agent in the auth worktree"

You do:

# Find the worktree path
git worktree list | grep auth

# Launch
.claude/skills/worktree-agents/scripts/launch-agent.sh worktrees/feature/auth "Continue auth work"

4. Cleanup Worktrees

User says: "Clean up the auth worktree" or "Clean up merged worktrees"

For single worktree:

# Check if PR is merged first
gh pr list --head feature/auth --state merged

# If merged (or user confirms), clean up
.claude/skills/worktree-agents/scripts/cleanup.sh feature/auth

# To also delete the git branch:
.claude/skills/worktree-agents/scripts/cleanup.sh feature/auth --delete-branch

For "merged" worktrees:

# Get list of registered worktrees
cat .claude/worktree-registry.json

# For each, check if PR is merged
gh pr list --head <branch> --state merged --json number

# Clean up those with merged PRs
.claude/skills/worktree-agents/scripts/cleanup.sh <branch> --delete-branch

Cleanup script handles:

• Killing processes on the port
• Removing worktree directory
• Pruning git references
• Unregistering from registry
• Optionally deleting local+remote branches

Registry Schema

Location: .claude/worktree-registry.json

{
  "worktrees": [
    {
      "branch": "feature/auth",
      "path": "worktrees/feature/auth",
      "port": 8124,
      "createdAt": "2025-12-02T10:00:00Z",
      "agentLaunchedAt": "2025-12-02T10:05:00Z",
      "task": "Implement OAuth login",
      "prNumber": null
    }
  ]
}

You update agentLaunchedAt after launching by re-running register.sh (it updates existing entries).

You update prNumber when you discover a PR exists:

# Check for PR
PR_NUM=$(gh pr list --head feature/auth --json number --jq '.[0].number')

# Update registry with jq
jq ".worktrees |= map(if .branch == \"feature/auth\" then .prNumber = $PR_NUM else . end)" \
  .claude/worktree-registry.json > tmp.json && mv tmp.json .claude/worktree-registry.json

Configuration

Location: .claude/skills/worktree-agents/config.json

{
  "terminal": "ghostty",      // ghostty, iterm2, or tmux
  "shell": "fish",            // fish, bash, or zsh
  "claudeCommand": "cc",      // command to launch Claude Code
  "portRange": {
    "start": 8124,
    "end": 8128
  }
}

Terminal options:

• ghostty - Opens new Ghostty window (macOS)
• iterm2 - Opens new iTerm2 window (macOS)
• tmux - Creates new tmux session (cross-platform)

Script Reference

launch-agent.sh

./scripts/launch-agent.sh <worktree-path> [task-description]

# Examples:
./scripts/launch-agent.sh worktrees/feature/auth
./scripts/launch-agent.sh worktrees/feature/auth "Implement OAuth login"

register.sh

./scripts/register.sh <branch> <path> <port> [task]

# Examples:
./scripts/register.sh feature/auth worktrees/feature/auth 8124
./scripts/register.sh feature/auth worktrees/feature/auth 8124 "Implement OAuth"

unregister.sh

./scripts/unregister.sh <branch>

# Example:
./scripts/unregister.sh feature/auth

cleanup.sh

./scripts/cleanup.sh <branch> [--delete-branch]

# Examples:
./scripts/cleanup.sh feature/auth                    # Keep git branch
./scripts/cleanup.sh feature/auth --delete-branch   # Delete branch too

status.sh

./scripts/status.sh

Safety Guidelines

1. Before cleaning up, check PR status:

   • If PR is merged: safe to clean up everything
   • If PR is open: warn user, confirm before proceeding
   • If no PR: warn user there may be unsubmitted work

2. Before deleting branches, confirm with user if:

   • PR is not merged
   • No PR exists
   • Worktree has uncommitted changes

3. Port conflicts: If a port is in use by a non-worktree process, pick a different port

4. Max 5 worktrees: The default port range only supports 5 concurrent worktrees

Common Issues

"Port already in use"

# Find what's using it
lsof -i :8124

# Kill if it's a stale process
kill -9 <PID>

"Worktree already exists"

# Check existing worktrees
git worktree list

# Remove if stale
git worktree remove worktrees/<branch> --force
git worktree prune

"Branch already exists"

The git worktree command handles this:

# This tries -b (new branch) first, falls back to existing
git worktree add worktrees/<branch> -b <branch> 2>/dev/null || git worktree add worktrees/<branch> <branch>

Registry out of sync

# Compare registry to actual worktrees
cat .claude/worktree-registry.json
git worktree list

# Manually clean up stale entries
.claude/skills/worktree-agents/scripts/unregister.sh <stale-branch>

Example Session

User: "Spin up 2 worktrees for feature/dark-mode and fix/login-bug, then launch agents"

You:

1. Check registry for used ports → none used, start with 8124
2. Create worktrees:

   git worktree add worktrees/feature/dark-mode -b feature/dark-mode
   git worktree add worktrees/fix/login-bug -b fix/login-bug
   

3. Copy .agents/ directory (so agents have access to plans, RCAs):

   cp -r .agents worktrees/feature/dark-mode/.agents
   cp -r .agents worktrees/fix/login-bug/.agents
   

4. Install deps:

   cd worktrees/feature/dark-mode && npm install
   cd worktrees/fix/login-bug && npm install
   

5. Register:

   .claude/skills/worktree-agents/scripts/register.sh feature/dark-mode worktrees/feature/dark-mode 8124 "Implement dark mode toggle"
   .claude/skills/worktree-agents/scripts/register.sh fix/login-bug worktrees/fix/login-bug 8125 "Fix login redirect bug"
   

6. Launch agents:

   .claude/skills/worktree-agents/scripts/launch-agent.sh worktrees/feature/dark-mode "Implement dark mode toggle"
   .claude/skills/worktree-agents/scripts/launch-agent.sh worktrees/fix/login-bug "Fix login redirect bug"
   

7. Report:

   Created 2 worktrees with agents:
   
   | Branch | Port | Task |
   |--------|------|------|
   | feature/dark-mode | 8124 | Implement dark mode toggle |
   | fix/login-bug | 8125 | Fix login redirect bug |
   
   Both agents are now running in separate Ghostty windows.
   .agents/ directory copied to each worktree.