Conciseness

The body is dense and imperative with almost no filler ('没有数字的"问题"是感觉。', '改动落地 ≠ 已生效。'), but the '与经典方法论的关系' table (DMAIC/丰田/PDCA mapping) explains frameworks Claude already knows, and the 约定层 point is repeated across steps 2, 5, and the core-principles section. Efficient overall with minor trimmable over-explanation; not 5, but well above the padded verbosity of anchor 3.

Actionability

For an instruction-only, domain-agnostic methodology the guidance is maximally concrete: judgment questions ('约束存在吗？存在但没执行吗？为什么没执行——是不知道、忘了、还是没法强制？'), decision tables with criteria, session-aware gate rules ('决策方在场→必须展示并等待确认…高风险改动仍须停下等待人工确认'), and a literal copy-paste 输出契约 template. Per the rubric's scoring note, absence of code in an instruction-only skill is not penalized when guidance is this actionable.

Workflow Clarity

Nine explicitly numbered steps (0–9) with validation checkpoints at every risky point: the step-6 decision gate, step-7 '跑完相关检查…全部通过才算实施完成', the step-8 三件套 (物证/加载/行为), and an explicit error-recovery loop ('若未改进，回到第 2 步重新找根因') plus the 输出契约 checklist. This matches the top anchor's clear sequence + explicit validation + feedback loops + checklist.

Progressive Disclosure

Sections are clearly organized, but the body is a ~160-line monolith and its only external pointer is broken: '相关示例见 `examples/`' refers to a path that does not exist in the bundle (no examples/, references/, scripts/, or assets/ directories are present). The classic-methodology comparison table and empirical case notes are inlined content that could live in a separate file. Not anchor 4 because the sole reference is dangling and content that should be separate is inline; not anchor 2 because structure and signaling are otherwise good.

Specificity

The description lists ~10 concrete, named actions ('量化基线→全量列问题→根因分类→结构性方案→借鉴同类方案→归纳取舍→…→实施→验证生效→度量闭环') plus measurable principles ('优化必须可度量'), giving comprehensive coverage of the skill's behavior. It does not fit anchor 4 because there is no identifiable gap in the action coverage for its domain-agnostic methodology scope.

Completeness

It explicitly answers what (the full nine-stage pipeline plus core principles), when ('用于用户要求"优化"…等任何领域的系统性改进…时'), and when-not ('不用于单点小修复…不用于只读审查不出方案的场景'). Both what and when are explicit with concrete trigger phrases, matching the top anchor; anchor 4 would require the 'when' to be less specific.

Trigger Term Quality

Natural user phrasings are quoted verbatim — '优化''改进''复盘''为什么反复出问题''效率低/成本高/质量差/总是复发' and '接手反复失败的任务' — covering synonyms and colloquial variations a user would actually say. Not anchor 4: no common variant of these trigger phrases is obviously missing.

Distinctiveness Conflict Risk

It carves a clear niche (systematic, quantified problem-solving across domains) and explicitly rules out the adjacent cases by name ('不用于单点小修复（用 minimal-implementation）；不用于只读审查不出方案的场景'). Minimal conflict risk; not anchor 4, which would require only minor overlap risk rather than explicit demarcation.