Conciseness

The body is lean and dense — every section (适用范围, 工作流程, 架构边界, 输出契约, 验证) carries non-obvious domain-specific constraints, with no padding and no explanation of concepts Claude already knows. This matches anchor 5 ('lean and efficient; assumes Claude's competence; every token earns its place'); anchor 4 would require over-explanation that could be trimmed, and none is present.

Actionability

Commands are copy-paste ready ('python3 scripts/validate_repo.py --strict', 'python3 scripts/sync_skills.py --destination "<destination>" --profile core --check'), the output contract enumerates exact report fields and the PASS/PARTIAL/BLOCKED vocabulary, and a concrete fallback path ('包内 scripts/audit.py') is specified for when no validator exists. This matches anchor 5 (fully executable, specific coverage of the common cases); it is above anchor 4 because there are no minor gaps in the primary workflows.

Workflow Clarity

The 6-step workflow has a clear sequence with explicit validation checkpoints: strict validation up front, read-only '--check' before any write, '--apply' only on explicit user request, and a mandatory second '--check' after apply. This is precisely the anchor-5 pattern (explicit validation steps, feedback loops, verification checklist), and the destructive/batch cap of 3 does not apply because validation is thoroughly present — including the rule that old stdout or a single apply is never accepted as success evidence.

Progressive Disclosure

The skill is under 50 lines with well-organized sections and no need for external reference files; the only bundle file (scripts/audit.py) is correctly positioned as a portable fallback rather than inlined detail, so content is appropriately split. Per the rubric's simple-skill guidance this scores 5 with well-organized sections; there are no multi-level or buried references.

Specificity

The description lists multiple concrete actions — '检查包结构、manifest 和元数据' (check package structure, manifest and metadata), '识别私有或运行时文件' (identify private or runtime files), '审查目录组织' (review directory organization), '显式同步到其他设备' (explicitly sync to other devices) — comprehensive coverage of the skill's capabilities. Anchor 5 matches: multiple specific concrete actions with no gaps; it is not the level below (4) because coverage is complete rather than having minor gaps.

Completeness

Both 'what' (audit, verify, and safely sync Codex Skill repositories, with enumerated sub-actions) and 'when' ('用于维护 Skill 备份仓库、检查 Skill 是否完整、准备发布，或比较源仓库与已安装 Skill 目录') are explicitly and concretely answered with trigger phrases. This matches the anchor-5 example structure exactly; anchor 4 would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

Natural trigger phrases are present and well-chosen: '维护 Skill 备份仓库' (maintain skill backup repo), '检查 Skill 是否完整' (check if a skill is complete), '准备发布' (prepare for release), '比较源仓库与已安装 Skill 目录' (compare source repo vs installed skills). It falls at anchor 4 (good keyword coverage, a few natural terms missing): it lacks synonyms and concrete artifact names users might say, such as 'skills.json', 'audit skill repo', or 'sync skills between machines', which would be needed for anchor 5.

Distinctiveness Conflict Risk

It occupies a clear niche — structural auditing and device sync of Codex Skill repositories — with distinct triggers (skill backup repo, release preparation, installed-vs-source diff). It explicitly scopes away behavior quality (delegated to 'skill-quality-gate' in the body), minimizing overlap risk; anchor 5's 'clear niche with distinct triggers' fits better than anchor 4's 'minor overlap risk with closely related skills'.