Using Git Worktrees
Overview
Git worktrees create isolated workspaces sharing the same repository, allowing work on multiple branches simultaneously without switching.
Core principle: Systematic directory selection + safety verification = reliable isolation.
Announce at start: "I'm using the using-git-worktrees skill to set up an isolated workspace."
Worktree Creation
Use scripts/worktree-setup <branch-name> to handle directory selection, safety verification, dependency installation, and baseline testing in one step.
The script auto-detects the worktree directory (.worktrees/ > worktrees/ > CLAUDE.md preference), verifies gitignore, installs deps, and runs baseline tests. If no directory is auto-detected, it exits with a suggestion — the skill then asks the user and re-runs with --dir <path>.
Options: --dir <path> (override directory), --no-install, --no-test Exit codes: 0 = ready + tests pass, 1 = fatal, 2 = created but tests fail/not found
Quick Reference
| Situation | Action |
|---|---|
.worktrees/ exists | Use it (verify ignored) |
worktrees/ exists | Use it (verify ignored) |
| Both exist | Use .worktrees/ |
| Neither exists | Check CLAUDE.md -> Ask user |
| Directory not ignored | Add to.gitignore + commit |
| Tests fail during baseline | Report failures + ask |
Red Flags
Never: Create worktree without verifying ignored (project-local), skip baseline test verification, proceed with failing tests without asking, assume directory location.
Always: Follow directory priority (existing > CLAUDE.md > ask), verify ignored, auto-detect and run project setup, verify clean test baseline.
Integration
Called by: brainstorming (Phase 4), plan-execution Pairs with: finishing-a-development-branch (cleanup after work complete)
For detailed creation steps, setup commands, and example workflow, see references/creation-steps.md.