Install

$ npm i -g git-wisp    # aliased to wisp

How wisp works

There have been many attempts to nail a DX for parallel work in the agentic coding era. Most are thin wrappers over git worktree. Instead, this tool introduces a new paradigm: the wisp.

A wisp is a worktree in an isolated subshell that is pruned-on-close.

Here's how it works (key points in bold).

• You open a Git branch with wisp open <branch> or create a new one with wisp new <branch>.
• An ephemeral worktree is created for this branch (in .git/wisp/worktrees) and opened in a fresh subshell.
• You are now in an fresh checkout of your repo that is isolated on disk. Make changes with your agent/editor of choice and commit them.
• You close the subshell with wisp close. The associated worktree is auto-pruned.
• Your changes still exist on the associated branch, as Git commits/branches are shared among all worktrees. The worktree is destroyed—but your commits aren't.

Features

This approach has some nice properties.

• 🖥️ Tab-local checkouts — Normally a git checkout/git switch changes your active branch for all terminals. With wisps, you can functionality open branches in the current tab only.
• 🌳 Full isolation — Each wisp is isolated on disk, so the changes you make don't interfere anything else you're doing.
• 🙅‍♂️ Never stash again — You can wisp open a branch even with uncommitted changes. When you exit the subshell, things will be exactly the same as they were. ☕️
• 🪾 Consistent with branch semantics — As with regular git switch, wisp close won't let you close the subshell if you have unstaged/uncommitted changes. This is a feature, not a bug! Regular worktrees make it easy to lose your work in a forgotten corner of your file system.
• 🤖 Agent-ready — Spin up parallel wisps so multiple agents can work simultaneously without conflicts.

Quickstart

This section is entirely linear and self-contained. Try running all these commands in order to get a feel for how wisp works. First, install wisp.

$ npm i -g git-wisp

Then clone a repo (any repo works):

$ git clone [email protected]:colinhacks/zod.git
$ cd zod

After cloning, the main branch is checked out. Let's say we want to start work on a new feature:

$ wisp new feat-1

✓ feat-1 (from main)
Opened branch in ephemeral subshell at .git/wisp/worktrees/zod@feat-1
Type 'wisp close' to return.

You're now in a wisp. Check where you are:

$ pwd
/Users/colinmcd94/Documents/repos/zod/.git/wisp/worktrees/zod@feat-1

$ git branch --show-current
feat-1

Now let's make some changes. (You can also open the repo in an IDE, start an agent run, etc.)

$ touch a.txt

Now let's try to close the wisp.

$ wisp close
⚠ Uncommitted changes found. Commit, stash, or reset your changes first.
  Or use --force/-f to discard changes
    wisp close -f

We aren't able to close because we have uncommitted changes. Let's commit them.

$ git add -A && git commit -am "Add a.txt"

Now we can try closing again. Since our changes can be fast-forwarded from the base branch, wisp offers to auto-merge the changes.

$ wisp close
✓ Back in main
  Pruned worktree. Your changes are still in the 'feat-1' branch.
  To merge your changes:
    git merge feat-1

  Auto-merge? (y/n/never) y

✓ Merged 'feat-1' into 'main'

CLI

wisp v0.x.y - Human- and agent-friendly Git multitasking

Usage: wisp <command> [options]

Commands:
  new [branch]    Create a branch and open it [--from <branch>]
  open <branch>   Open a branch in a wisp
  close           Exit current wisp
  ls              List orphaned worktrees
  status          Show current branch
  rm <branch>     Remove a branch's worktree
  config          Show or create config file

Options:
  --help, -h      Show help
  --version, -v   Show version

List orphaned worktrees

Normally the worktree will be auto-pruned when you close its associated wisp. If a worktree is left behind for some reason, you can list them with wisp ls.

$ wisp ls
┌────────┬───────────┬───────────────┐
│ branch │ status    │ created       │
├────────┼───────────┼───────────────┤
│ main * │ clean     │ -             │
│ feat-1 │ 1 changed │ 5 minutes ago │
└────────┴───────────┴───────────────┘

Open a branch in a wisp

You can open any existing Git branch in a wisp.

$ wisp open feat-1

✓ feat-1 (existing worktree)
Type 'wisp close' to return.

Show current branch status

$ wisp status
branch:    main (root)
worktree:  /path/to/zod
status:    clean

Remove a worktree

Remove the worktree for a branch (the branch itself is kept):

$ wisp rm feat-1

✓ Pruned worktree for feat-1

Closing a wisp

This closes the current wisp and auto-prunes the associated worktree. Your changes survive in your branch commits.

$ wisp close
✓ Back in main
  Pruned worktree. Your changes are still in the 'feat-1' branch.
  To merge your changes:
    git merge feat-1

  Auto-merge? (y/n/never) y

✓ Merged 'feat-1' into 'main'

If the branch hasn't been pushed to a remote, you'll be prompted to auto-merge:

• y — merge into base branch
• n — skip (branch is kept, merge manually later)
• never — permanently disable auto-merge prompt

That command will fail if you have unstaged/uncommited changes. Use the --force/-f flag to force close the wisp; this will discard uncommitted changes.

$ wisp close --force

Print or create a wisp.toml

To print or create a config file:

$ wisp config

✓ Config file: /path/to/repo/.git/wisp.toml

────────────────────────────────────────────────────────────
setup = "npm install"
────────────────────────────────────────────────────────────

If no config exists, you'll be prompted to create one.

$ wisp config

No config file found.

Where would you like to create one?
  1. .git/wisp.toml (local only, not committed)
  2. wisp.toml (project root, can be committed)

Choice (1/2): 1

✓ Created /path/to/repo/.git/wisp.toml

wisp.toml

You can configure wisp with a wisp.toml file. This is useful for running setup scripts when opening a wisp (e.g., npm install).

wisp looks for config files in the following order:

| Path | Description | |------|-------------| | .git/wisp.toml | Local only, not committed (highest precedence) | | wisp.toml | Project root, can be committed |

# setup script executed in subshell after initialization
setup = "npm install && cp {{ repo_path }}/.env {{ worktree_path }}/.env"

The following variable substitutions are supported in setup.

| Variable | Description | Example | |----------|-------------|---------| | {{ branch }} | Branch name | feature/auth | | {{ repo_path }} | Absolute path to main repo | /path/to/repo | | {{ worktree_path }} | Absolute path to worktree | /path/to/repo/.git/wisp/worktrees/repo@feat |