Git Worktree Isolation

Choose and hand off the safest workspace for development without disturbing unrelated user work or creating lifecycle state that the current harness cannot manage. This skill owns workspace selection, isolation, provenance, and a starting baseline. It does not implement the task, finish branches, remove workspaces after handoff, install dependencies by default, or orchestrate agents.

Scope, invariant, and non-goals

Use this skill before mutation when workspace choice can affect user work, task attribution, parallel safety, or the ability to reproduce a failure. A tiny local edit in a clean dedicated branch can legitimately proceed in place.

DETECT BEFORE CREATE.
PREFER OWNED NATIVE ISOLATION.
NEVER FIGHT THE HARNESS OR PROJECT INSTRUCTIONS.