Lattice Technologies Inc Harness Engineering Git Worktree

Git Worktree Manager

Manage Git worktrees for isolated parallel development with environment file management and shared-context support for multi-agent workflows.

When to Use

• Spinning up a parallel feature branch without disrupting current work
• Isolated code review of a PR
• Multi-agent development where each agent works in its own worktree
• Any time git stash / branch-switching friction is slowing things down

CRITICAL: Always Use the Manager Script

Never call git worktree add directly. Always use the manager script — it handles env file copying, .gitignore management, and writes .worktree-config for agent use.

# Correct
bash .claude/skills/git-worktree/scripts/worktree-manager.sh create feature-name

# Wrong
git worktree add .worktrees/feature-name -b feature-name main

Commands

SCRIPT=".claude/skills/git-worktree/scripts/worktree-manager.sh"

# Create new worktree (copies .env files, writes .worktree-config)
bash $SCRIPT create <branch-name> [from-branch]

# List all worktrees
bash $SCRIPT list

# Switch to a worktree
bash $SCRIPT switch <name>

# Refresh .env files from main repo
bash $SCRIPT copy-env [name]

# Clean up inactive worktrees
bash $SCRIPT cleanup

What Happens on Create

1. Updates the base branch from remote
2. Creates worktree at .worktrees/<branch-name>/
3. Copies all .env* files from main repo (except .env.example)
4. Writes .worktree-config with MAIN_REPO path
5. Adds .worktrees to .gitignore if missing

Shared Context Pattern

Worktrees are isolated file trees — they do NOT share docs/, plans/, or other non-git content with the main repo. To avoid drift and duplication:

For Agents Working in a Worktree

1. Read .worktree-config to get MAIN_REPO path
2. Reference shared docs from $MAIN_REPO/docs/ — do not duplicate them into the worktree
3. When creating or editing plans, write to $MAIN_REPO/docs/plans/
4. The worktree is for code changes only; docs live in the main repo

# Example: read MAIN_REPO from config
source .worktree-config
cat "$MAIN_REPO/docs/plans/my-plan.md"

Why Not Symlinks?

Symlinks point one direction. If worktree/docs → main/docs, edits in the worktree modify main's files directly. With multiple agents in multiple worktrees, this creates race conditions. The config-based approach is explicit and safe.

Directory Structure

project-root/
├── .worktrees/                    # gitignored
│   ├── feat/new-feature/          # worktree 1
│   │   ├── .git
│   │   ├── .env                   # copied from main
│   │   ├── .worktree-config       # MAIN_REPO pointer
│   │   └── src/
│   └── fix/bug-123/               # worktree 2
│       ├── .git
│       ├── .env
│       ├── .worktree-config
│       └── src/
├── docs/                          # single source of truth
│   ├── plans/
│   └── references/
└── .gitignore                     # includes .worktrees

Integration Notes

• Worktrees share git objects with the main repo (lightweight, no duplication)
• Each worktree has its own branch — commits from one don't affect others
• Push from any worktree normally
• .worktree-config is auto-generated and should not be committed

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