# Using git worktrees > Use when feature work needs a workspace isolated from the current one. 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 ## Facts - Type: Agent skill - Discipline: Engineering - Author: Jesse Vincent (https://github.com/obra) - Upstream: https://github.com/obra/superpowers/tree/main/skills/using-git-worktrees - Source file: https://raw.githubusercontent.com/obra/superpowers/main/skills/using-git-worktrees/SKILL.md (6813 bytes, sha256:8cfb86f121269e8f7f12361e6795c4f6738828340e28964c9229d365666c9edd) - Licence: MIT - Upstream copy last changed: 2026-09-17 - Status: listed, not yet ruled on by the curator ## Use it I want to use the Using git worktrees skill by Jesse Vincent. This is what it does, in the author's own words: 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 Download the whole folder at https://github.com/obra/superpowers/tree/main/skills/using-git-worktrees, SKILL.md and every file beside it, into your skills directory: ~/.claude/skills/using-git-worktrees/ for Claude Code, ~/.agents/skills/using-git-worktrees/ for Codex, ~/.cursor/skills/using-git-worktrees/ for Cursor. Get it from the author's repo, not from startupskills.dev. Then tell me the path you installed it to and how to invoke it. Nothing here is vendored: install from the author's repo, not from this site. A verbatim copy of the author's file follows for reading, under the licence reproduced after it; the current file is in the author's repo. ## Links - Page: https://startupskills.dev/obra/using-git-worktrees - Author: https://startupskills.dev/obra - Index: https://startupskills.dev/llms.txt ## The file itself --- 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 2 (Project Setup). Do NOT create another worktree. Report with branch state: - On a branch: "Already in isolated workspace at `` on branch ``." - Detached HEAD: "Already in isolated workspace at `` (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. Has the user already indicated their worktree preference in your instructions? If not, ask for consent before creating a worktree: > "Would you like me to set up an isolated worktree? It protects your current branch from changes." Honor any existing declared preference without asking. If the user declines consent, work in place and skip to Step 2. ## Step 1: Create Isolated Workspace **You have two mechanisms. Try them in this order.** ### 1a. Native Worktree Tools (preferred) The user has asked for an isolated workspace (Step 0 consent). Do you already have a way to create a worktree? It might be a tool with a name like `EnterWorktree`, `WorktreeCreate`, a `/worktree` command, or a `--worktree` flag. If you do, use it and skip to Step 2. 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. Only proceed to Step 1b if you have no native worktree tool available. ### 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. Explicit user preference always beats observed filesystem state. 1. **Check your instructions for a declared worktree directory preference.** If the user has already specified one, use it without asking. 2. **Check for an existing project-local worktree directory:** ```bash ls -d .worktrees 2>/dev/null # Preferred (hidden) ls -d worktrees 2>/dev/null # Alternative ``` If found, use it. If both exist, `.worktrees` wins. 3. **If there is no other guidance available**, default to `.worktrees/` at the project root. #### 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. #### Create the Worktree ```bash # Determine path based on chosen location path="$LOCATION/$BRANCH_NAME" git worktree add "$path" -b "$BRANCH_NAME" cd "$path" ``` **Sandbox fallback:** If `git worktree add` fails with a permission error (sandbox denial), tell the user the sandbox blocked worktree creation and you're working in the current directory instead. Then run setup and baseline tests in place. ## Step 2: 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 3: 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 Tests passing ( tests, 0 failures) Ready to implement ``` ## 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/` | | 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 | ## Common Rationalizations | Excuse | Reality | |--------|---------| | "I'm obviously not in a worktree — no need to check" | Run Step 0. Harness-created isolation and submodules both fool eyeballing; the detection commands settle it. | | "`git worktree add` is quicker than hunting for a native tool" | A native tool (e.g. `EnterWorktree`) owns placement, branching, and cleanup. Bypassing it is the #1 mistake — it creates phantom state your harness can't see or manage. | | "The worktree directory is surely ignored already" | Run `git check-ignore`. An unignored worktree directory commits the whole tree into the repo. | | "Any directory name works" | Explicit instructions beat an existing project-local directory, which beats the `.worktrees/` default. | | "The workspace is fresh — baseline tests can wait" | A dirty baseline makes every later failure ambiguous. Run the tests now; proceeding past failures is your human partner's call. | ## Licence of the file above The file above is https://raw.githubusercontent.com/obra/superpowers/main/skills/using-git-worktrees/SKILL.md, by Jesse Vincent, reproduced without changes. - Source: https://github.com/obra/superpowers/tree/main/skills/using-git-worktrees - Copyright: Copyright (c) 2025 Jesse Vincent - Licence: MIT, https://raw.githubusercontent.com/obra/superpowers/main/LICENSE The repo's licence file, verbatim from https://raw.githubusercontent.com/obra/superpowers/main/LICENSE: MIT License Copyright (c) 2025 Jesse Vincent Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.