Conciseness

The body is dense, prescriptive, and assumes Claude's competence — no basic Git or package-manager explanations — with each section earning most of its tokens. Not 5 because of repetition (references/git_safety.md is pointed to from the entry router, principle 4, Workflow B, and the Git safety section) and some abstract principle prose ('A hook is not a more professional version of a sentence') that could be trimmed.

Actionability

Concrete, verified commands are given for the bundled scripts (`uv run python scripts/check_env.py --repo <repo-root>` with documented exit-code semantics, and the init hook with --dry-run), and specific git commands appear where needed. Not 5 because sanitize_history.sh is described but never invoked with flags, and Workflow C stays at checklist altitude without examples — minor gaps against 'specific examples cover the common cases'.

Workflow Clarity

Workflows A–D are clearly sequenced with explicit validation: A3 mandates capturing evidence, tracing to source, smallest repair, and re-running the failed check (a feedback loop); A4 requires verifying the observable result; the hook gate requires a --dry-run preview and user confirmation before install; destructive Git operations are gated by approval requirements. Matches the anchor 'Clear sequence with explicit validation steps; feedback loops for error recovery'.

Progressive Disclosure

The body is a genuine overview with an entry router, and all detail lives in one-level-deep, clearly signaled references: the four referenced files and three scripts all exist, the git_safety.md anchor links resolve to real headings, cross-links between reference files are sparse and signaled, and a Resources section indexes everything. Matches the score 5 anchor.

Specificity

The description lists multiple concrete action areas — "Diagnoses and repairs repository setup and guarded Git workflows", "environment repair, startup sync, hook auditing, collaborator handoff" — covering all of the skill's modes comprehensively. It fits the anchor 'Lists multiple specific concrete actions; comprehensive coverage' rather than score 4, which would require minor coverage gaps.

Completeness

It explicitly answers both questions: the what ("Diagnoses and repairs repository setup and guarded Git workflows...") and the when ("Use when a repo won't run, a teammate onboards, hook output duplicates, or commit/push/conflict needs guarding") with concrete trigger phrases. Matches the anchor for score 5 exactly; the 'when' clause is explicit, not weakly implied as at score 4.

Trigger Term Quality

Natural user phrasings are present ("a repo won't run", "a teammate onboards", "hook output duplicates", "commit/push/conflict needs guarding"), giving good keyword coverage. Not 5 because common variations users would actually say — 'new machine', 'pull the latest', 'onboarding a new developer' — are absent.

Distinctiveness Conflict Risk

Beyond a clear niche (repo setup and guarded Git workflows for Claude Code/Codex), it adds explicit negative triggers — "Not for lost-commit recovery (use git-safety-net), GitHub ops (use github-ops), or history scrubbing (use github-sensitive-data-cleanup)" — actively routing away sibling skills. Minimal conflict risk; matches the score 5 anchor.