superpowers/skills/using-git-worktrees/SKILL.md

---
name: using-git-worktrees
description: Use when starting feature work that needs isolation from current workspace or before executing implementation plans - ensures an isolated workspace exists via native tools or git worktree fallback
---

# Using Git Worktrees

## Overview

Ensure work happens in an isolated workspace. Prefer your platform's native worktree tools. Fall back to manual git worktrees only when no native tool is available.

**Core principle:** Detect existing isolation first. Then use native tools. Then fall back to git. Never fight the harness.

**Announce at start:** "I'm using the using-git-worktrees skill to set up an isolated workspace."

## Step 0: Detect Existing Isolation

**Before creating anything, check if you are already in an isolated workspace.**

```bash
GIT_DIR=$(cd "$(git rev-parse --git-dir)" 2>/dev/null && pwd -P)
GIT_COMMON=$(cd "$(git rev-parse --git-common-dir)" 2>/dev/null && pwd -P)
BRANCH=$(git branch --show-current)
```

**Submodule guard:** `GIT_DIR != GIT_COMMON` is also true inside git submodules. Before concluding "already in a worktree," verify you are not in a submodule:

```bash
# If this returns a path, you're in a submodule, not a worktree — treat as normal repo
git rev-parse --show-superproject-working-tree 2>/dev/null
```

**If `GIT_DIR != GIT_COMMON` (and not a submodule):** You are already in a linked worktree. Skip to Step 3 (Project Setup). Do NOT create another worktree.

Report with branch state:
- On a branch: "Already in isolated workspace at `<path>` on branch `<name>`."
- Detached HEAD: "Already in isolated workspace at `<path>` (detached HEAD, externally managed). Branch creation needed at finish time."

**If `GIT_DIR == GIT_COMMON` (or in a submodule):** You are in a normal repo checkout. Proceed to Step 0.5.

## Step 0.5: Consent — REQUIRED STOP

**You MUST ask the user before creating any workspace. Do NOT proceed to Step 1 without an answer.**

Output exactly this, then STOP and wait for a response:

> "I can set up an isolated worktree for this work, or work directly on your current branch. Which do you prefer?"

- **User wants a worktree** → proceed to Step 1
- **User wants to work in place** → skip to Step 3 (no worktree, no directory change)

Do NOT interpret silence or an unrelated reply as consent. If unclear, ask once more.

## Step 1: Create Isolated Workspace

**You have two mechanisms. Try them in this order.**

### 1a. Native Worktree Tools (preferred — STOP HERE if available)

The user has asked for an isolated workspace (Step 0 consent). Check your available tools — do you have `EnterWorktree`, `WorktreeCreate`, a `/worktree` command, or a `--worktree` flag? **If YES: the user's consent to create a worktree is your authorization to use it. Use it now and skip to Step 3.**

Native tools handle directory placement, branch creation, and cleanup automatically. Using `git worktree add` when you have a native tool creates phantom state — your harness can't see or manage worktrees it didn't create, and cleanup becomes impossible.

**Even if `.worktrees/` already exists, even under time pressure, even if `git worktree add` feels faster — use your native tool.** There are no exceptions.

**Only proceed to Step 1b if you have confirmed you have NO native worktree/isolation tool.**

### 1b. Git Worktree Fallback

**Only use this if Step 1a does not apply** — you have no native worktree tool available. Create a worktree manually using git.

#### Directory Selection

Follow this priority order:

1. **Check existing directories:**
   ```bash
   ls -d .worktrees 2>/dev/null     # Preferred (hidden)
   ls -d worktrees 2>/dev/null      # Alternative
   ```
   If found, use that directory. If both exist, `.worktrees` wins.

2. **Check for existing global directory:**
   ```bash
   project=$(basename "$(git rev-parse --show-toplevel)")
   ls -d ~/.config/superpowers/worktrees/$project 2>/dev/null
   ```
   If found, use it (backward compatibility with legacy global path).

3. **Check your project's agent instruction file** (CLAUDE.md, GEMINI.md, AGENTS.md, .cursorrules, or equivalent) for a worktree directory preference. If specified, use it without asking.

4. **Default to `.worktrees/`.**

#### Safety Verification (project-local directories only)

**MUST verify directory is ignored before creating worktree:**

```bash
git check-ignore -q .worktrees 2>/dev/null || git check-ignore -q worktrees 2>/dev/null
```

**If NOT ignored:** Add to .gitignore, commit the change, then proceed.

**Why critical:** Prevents accidentally committing worktree contents to repository.

Global directories (`~/.config/superpowers/worktrees/`) need no verification.

#### Create the Worktree

```bash
project=$(basename "$(git rev-parse --show-toplevel)")

# Determine path based on chosen location
# For project-local: path="$LOCATION/$BRANCH_NAME"
# For global: path="~/.config/superpowers/worktrees/$project/$BRANCH_NAME"

git worktree add "$path" -b "$BRANCH_NAME"
cd "$path"
```

**Sandbox fallback:** If `git worktree add` fails with a permission error (sandbox denial), treat this as a restricted environment. Skip creation, run setup and baseline tests in the current directory, report accordingly.

## Step 3: Project Setup

Auto-detect and run appropriate setup:

```bash
# Node.js
if [ -f package.json ]; then npm install; fi

# Rust
if [ -f Cargo.toml ]; then cargo build; fi

# Python
if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
if [ -f pyproject.toml ]; then poetry install; fi

# Go
if [ -f go.mod ]; then go mod download; fi
```

## Step 4: Verify Clean Baseline

Run tests to ensure workspace starts clean:

```bash
# Use project-appropriate command
npm test / cargo test / pytest / go test ./...
```

**If tests fail:** Report failures, ask whether to proceed or investigate.

**If tests pass:** Report ready.

### Report

```
Worktree ready at <full-path>
Tests passing (<N> tests, 0 failures)
Ready to implement <feature-name>
```

## Quick Reference

| Situation | Action |
|-----------|--------|
| Already in linked worktree | Skip creation (Step 0) |
| In a submodule | Treat as normal repo (Step 0 guard) |
| Native worktree tool available | Use it (Step 1a) |
| No native tool | Git worktree fallback (Step 1b) |
| `.worktrees/` exists | Use it (verify ignored) |
| `worktrees/` exists | Use it (verify ignored) |
| Both exist | Use `.worktrees/` |
| Neither exists | Check instruction file, then default `.worktrees/` |
| Global path exists | Use it (backward compat) |
| Directory not ignored | Add to .gitignore + commit |
| Permission error on create | Sandbox fallback, work in place |
| Tests fail during baseline | Report failures + ask |
| No package.json/Cargo.toml | Skip dependency install |
| Plan touches multiple repos | Create a worktree in each repo (same Step 0→1a→1b flow, matching branch names) |

## Common Mistakes

### Fighting the harness

- **Problem:** Using `git worktree add` when the platform already provides isolation
- **Fix:** Step 0 detects existing isolation. Step 1a defers to native tools.

### Skipping detection

- **Problem:** Creating a nested worktree inside an existing one
- **Fix:** Always run Step 0 before creating anything

### Skipping ignore verification

- **Problem:** Worktree contents get tracked, pollute git status
- **Fix:** Always use `git check-ignore` before creating project-local worktree

### Assuming directory location

- **Problem:** Creates inconsistency, violates project conventions
- **Fix:** Follow priority: existing > global legacy > instruction file > default

### Proceeding with failing tests

- **Problem:** Can't distinguish new bugs from pre-existing issues
- **Fix:** Report failures, get explicit permission to proceed

## Red Flags

**Never:**
- Create a worktree when Step 0 detects existing isolation
- Use `git worktree add` when you have a native worktree tool (e.g., `EnterWorktree`). This is the #1 mistake — if you have it, use it.
- Skip Step 1a by jumping straight to Step 1b's git commands
- Create worktree without verifying it's ignored (project-local)
- Skip baseline test verification
- Proceed with failing tests without asking

**Always:**
- Run Step 0 detection first
- Prefer native tools over git fallback
- Follow directory priority: existing > global legacy > instruction file > default
- Verify directory is ignored for project-local
- Auto-detect and run project setup
- Verify clean test baseline

## Integration

**Called by:**
- **subagent-driven-development** - Ensures isolated workspace (creates one or verifies existing)
- **executing-plans** - Ensures isolated workspace (creates one or verifies existing)
- Any skill needing isolated workspace

**Pairs with:**
- **finishing-a-development-branch** - REQUIRED for cleanup after work complete