tidying-worktrees

name	tidying-worktrees
description	Sweep spent clean worktrees whose branches merged or vanished; preserve dirty or unpushed work.
user-invocable	true
allowed-tools	Bash(node:*), Bash(git worktree:*), Bash(git branch:*), Bash(git fetch:*), Bash(pnpm i:*), Read
model	claude-haiku-4-5
context	fork
metadata	{"internal":true}

tidying-worktrees

Interrupted cascade waves and finished tasks leave spent worktrees scattered across the fleet (chore/wheelhouse-<sha> leftovers, merged feature branches, abandoned ci-cascade-layer trees). Cleaning each by hand is friction. This skill is the fleet-wide, conservative, no-prompt sweep — safe to run unattended.

It is the fleet-wide sibling of managing-worktrees (which prunes the current repo). Both share one removability predicate (decideWorktree in lib/tidy-worktrees.mts); this engine iterates the canonical roster.

When to use

• Periodic care. Run on a /loop so worktree clutter never accumulates.
• Before a cascade wave. Clear interrupted-wave leftovers so a fresh wave starts from a clean fleet.
• After a batch of merges. Reclaim the merged-but-not-deleted branches.

Run it

# Dry-run (default): report what WOULD be removed, mutate nothing.
node .claude/skills/fleet/tidying-worktrees/lib/tidy-worktrees.mts

# Act: remove spent worktrees fleet-wide.
node .claude/skills/fleet/tidying-worktrees/lib/tidy-worktrees.mts --fix

# Restrict to one repo.
node .claude/skills/fleet/tidying-worktrees/lib/tidy-worktrees.mts --fix --repo socket-cli

The engine reads the canonical roster from cascading-fleet/lib/fleet-repos.txt (1 path, 1 reference — never a second roster) and resolves sibling repos under $PROJECTS (default ~/projects).

Periodic, no-prompt operation

For background care, drive it with /loop:

/loop 6h /fleet:tidying-worktrees --fix

Every 6 hours it sweeps the fleet and removes only provably-spent worktrees. Nothing to remove → it says so and exits. It never prompts: the conservative predicate means an unattended --fix can only ever remove worktrees with no work to lose.

Removability contract (conservative by construction)

A non-primary worktree is removed ONLY when its tree is clean AND it has nothing left to land, where "nothing to land" means EITHER:

1. its branch is fully merged into origin/<base> (every commit is already an ancestor — spent), OR
2. its branch is gone from the remote AND the worktree is not ahead of the base — a never-shared local branch with no unpushed commits.

Everything else is kept:

• dirty → may be live work, never auto-removed;
• ahead of base → carries unpushed commits (this guard is load-bearing: a workflow's local-only isolation worktree reads as "branch gone from remote" yet may hold unpushed work — removing it would lose that work);
• on remote with unlanded commits → a real open branch.

Gotchas the engine handles

• Submodule worktrees. git worktree remove refuses a worktree containing submodules even when clean. The engine passes --force only after the clean-tree check, so it clears the submodule guard without discarding work.
• Relink after removal. A git worktree remove can dangle the primary checkout's node_modules symlinks. After a --fix that removed anything, run pnpm i in each affected repo's primary checkout — the engine names them.
• Default branch fallback. Base resolves via git symbolic-ref refs/remotes/origin/HEAD → main → master. Never hard-coded.

Safety contract

1. Parallel Claude sessions / Don't leave the worktree dirty: never removes a dirty or ahead-of-base worktree — only provably-spent ones.
2. Default branch fallback: every base lookup follows main → master.
3. 1 path, 1 reference: the roster + the removability predicate each live in exactly one place; managing-worktrees and this skill share them.