Mostly efficient operational prose with concrete commands, but includes unnecessary explanation — the upstream-issue citations ('anthropics/claude-code#27881 and #39886'), rationale sentences ('the single most common cause of transient worktree add failures'), and the multi-line worked example. Not a 3 because not every token earns its place; not a 1 because there is no padding with concepts Claude already knows.

Fully executable guidance — real git commands ('git -C "$REPO" worktree add … -b', 'show-ref --verify --quiet'), exact slug-sanitization rules, copy-paste bash blocks, and precise AskUserQuestion wording. Not a 2 because commands are complete and runnable rather than pseudocode.

Clearly sequenced Steps 0–7 with sub-steps, explicit validation checkpoints (preflight, worktree-creation verification against 'git worktree list'), and a retry feedback loop (prune → re-add → spawn or mark failed). Not a 2 because validation and error-recovery loops are explicit, not implicit.

Overview keeps orchestration inline while detailed procedures are split into one-level-deep, well-signaled references ('Read … preflight-validation.md and follow its procedure', 'Read the worker instructions template from … worker-instructions.md'), both of which exist as substantial files. Not a 2 because references are clearly signaled and not nested stub chains.

Lists multiple concrete actions — 'spawn parallel worktree-isolated background agents to implement multiple pending features simultaneously', 'Each worker runs as a full independent session with all tools', and 'requires pending plans in .arness/plans/'. Not a 2 because it goes beyond naming a domain to enumerating specific operational actions.

Explicitly answers both: what ('spawn parallel worktree-isolated background agents…') and when ('This skill should be used when the user says…'). Not capped at 2 because an explicit 'should be used when' trigger clause is present.

Provides ~11 trigger phrases users would naturally say — 'batch implement', 'implement all', 'implement everything', 'parallel implement', 'implement in parallel', 'launch batch workers'. Not a 2 because coverage of natural phrasings is broad, not just a single keyword.

Clear niche — parallel worktree-isolated batch orchestration — with batch/parallel-specific triggers unlikely to fire for single-feature implement skills. Not a 2 because the parallel/worktree framing is dominant and distinct, despite 'implement all'/'implement everything' being mildly generic.