An agent sandbox mounts every .git/worktrees/<id> read-only, so git worktree remove unregisters the worktree and then fails with EBUSY; container-owned files fail with EACCES. The worktree rules now forbid removal inside the sandbox and hand the operator the ownership count, chown and removal command in one message. A dirty worktree is a candidate only when all its changed and untracked content is preserved at a branch tip, and an untagged image with RepoDigests counts as a medium-risk digest pull. Both files were trimmed so the skill text does not grow. 🎯 Fix: 92 % 💥 Break: 2 % 💸 Cost: 100 % ⏱️ Time: 100 % 🛡️ Security: 100 % 🏆 Score: 90 🚦 Gate: ✅ 90/5, cost and time <= 100, security 100 % Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Worktrees
Inventory
Per worktree: size (du -sh), dirty state, whether its branch is pushed and
whether its HEAD is in an integration line (the default branch and every
branch the project merges features into; ask the operator or the project's
memory). With pkgmgr, pkgmgr branch gc --json --sizes --merged-into <line> (one per line) measures it all; merged-clean items go to the
kvb-git-branch-gc skill.
Clean and in a line: medium, its ignored files (node_modules, build output,
evidence) are lost. Dirty: a candidate only when every changed, staged and
untracked file is a blob at some branch tip and a detached HEAD is reachable
from another ref; else it is unique work and stays.
Removal
The way it was made: a slot worktree through the project's teardown target
(e.g. make worktree-down), a sidetree through git worktree remove,
--force only for a dirty one cleared above. Never in an agent sandbox: its
read-only .git/worktrees/<id> mounts make git unregister and then fail with
Device or resource busy, container-owned files with Permission denied.
Hand the operator in one message, per worktree, its count of find <wt> -not -user "$USER" -prune | wc -l, sudo chown -R "$USER": <wt> where it is not
0, then the removal command.