Lean and dense: no generic git concepts are explained, every section delivers commands or decision rules, and tokens go only to non-obvious harness-specific gotchas. It assumes Claude's git competence throughout.

Executable, copy-paste-ready commands throughout (the awk audit pipeline, `git merge-base --is-ancestor`, `git worktree remove`, `git branch -d/-D`, `git worktree prune`) with explicit per-condition decision rules in the 'Decide per worktree' block.

Clear audit -> classify -> decide -> reap sequence with explicit validation checkpoints and feedback loops ('Re-run the audit', 'Never reap on a self-reported it's merged', final-checks checklist), well above the destructive-operation bar that would cap at 2.

The body is self-contained and well-organized into focused sections with no bundle files (references/scripts/assets are absent); for a single-purpose skill under 50 effective lines, well-organized sections earn the top anchor per the simple-skills note.

Multiple concrete actions are named ('Reap merged git worktrees and branches', 'removing an orphaned or detached worktree', 'deciding whether a worktree is safe to delete'), spanning reaping, removal, and the decision procedure.

It answers 'what' (reap merged worktrees and branches safely) and 'when' explicitly via the 'Use when...' clause, and additionally scopes out non-use ('Not for creating branches or authoring commits').

Natural phrases users would say are well covered: 'worktrees pile up', 'after a branch merges', 'cleaning up `git worktree list`', 'orphaned or detached worktree', 'safe to delete'.

The niche is distinct (worktree/branch reaping across four named harnesses) and the negative scope ('Not for creating branches or authoring commits (use the git skill)') sharply separates it from the related git skill.