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worktree

Use when work needs an isolated git worktree: new work, an existing ref, a gated feature workspace, a manifest-tracked loop run, or a candidate patch captured without touching the current checkout (`capture-isolated-patch`). Not for plain branches: use create-branch. Not for remote, credential, publish, deploy, or irreversible changes.

.devin/skills/worktree/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# Worktree isolation

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A new isolated worktree or branch is requested, an existing ref or PR needs isolation, feature work needs a gated workspace with setup and baseline tests (feature-gate mode), a run needs a manifest-tracked worktree (loop-run mode), or a candidate patch must be captured from an ephemeral worktree without touching the current checkout (`capture-isolated-patch` mode). |
| Authority | Reversible local: writes only the worktree directory, `.worktrees/` or `.loop-worktrees/` entries, a gitignore entry, symlinked hooks, manifest bookkeeping, or (`capture-isolated-patch` mode) a fresh temporary worktree and binary-safe patch under its parent temporary directory; rollback is removing the worktree and reverting those entries. Capture-isolated-patch mode never writes the original checkout. Loop-run mode never passes `--force` to `git worktree remove`. No remote mutation. |
| Side effect | Local write: creates or attaches an isolated git worktree and reports its exact path and status. Feature-gate mode also runs setup and the baseline test suite. Loop-run mode also maintains a status manifest under `.loop-worktrees/`. Capture-isolated-patch mode runs the command in an ephemeral worktree, captures stdout/stderr/exit code, and writes and returns a binary-safe patch file path or preserves the worktree on extraction failure. |
| Done | `new-work` and `isolate-existing-ref` modes have an isolated workspace the harness can see and manage, with no phantom state. `feature-gate` adds a green baseline suite or surfaces a failure. `loop-run` adds a manifest where every worktree has a legal status and no removal used `--force`. `capture-isolated-patch` writes and returns a binary-safe patch file path and command results, removes its temporary worktree after successful extraction, or preserves it and reports extraction failure; the original checkout is unchanged either way. |

## Inputs

1. Mode (required): one of `new-work`, `isolate-existing-ref`, `feature-gate`, `loop-run`, `capture-isolated-patch`. Default `new-work` when no ref is named and no gate, lifecycle, or patch capture is requested.