Conciseness

The body is mostly efficient operational guidance, but several sections restate knowledge Claude already has or duplicate the reference: 'Suggest Specific Refactorings' catalogs patterns like 'Strategy, Decorator, Command, Facade' and 'Replace conditionals with polymorphism', and the 'Resources' section merely lists what references/rules.md contains ('Detailed explanation of each rule / Rationale and benefits...'). This matches 'mostly efficient but includes some unnecessary explanation or could be tightened' (3); it is not severely padded (2) nor free of over-explanation (4).

Actionability

Guidance is fully executable: precise counting rules with runnable Ruby examples ('def method(a, *rest) # 2 parameters - OK'), a copy-paste-ready RuboCop YAML config, explicit thresholds for priority tiers ('Classes over 200 lines', 'Methods with 5 parameters'), and a concrete load instruction ('Read references/rules.md'). Specific examples cover the common cases, matching the score-5 anchor.

Workflow Clarity

The five-step Code Review Workflow is clearly sequenced, and the three Usage Patterns give concrete numbered procedures with '4. Verify that tests still pass' as a checkpoint. It falls short of the score-5 anchor because validation appears only in the refactoring pattern — the review patterns have no verify/feedback step — matching 'clear sequence with most checkpoints present; minor validation gaps'.

Progressive Disclosure

The single bundle file references/rules.md exists and is clearly signaled at one level of depth ('Read references/rules.md' appears in both the workflow and Pattern 3), with the body organized into scannable sections. It does not reach 5 because content that also lives in the reference (rule details, refactoring strategies, when-to-break guidance per the Resources list) is substantially inlined, so the split is good but not minimal.

Specificity

The description lists multiple concrete, parameterized capabilities — 'classes under 100 lines, methods under 5 lines, no more than 4 parameters, and controllers instantiate only one object' — comprehensively covering all four rules with specific thresholds. It is not vague fluff; every claim is explicit, matching the 'comprehensive coverage' anchor rather than the score-4 anchor which implies gaps.

Completeness

It explicitly answers both questions: 'what' is the application of the four rules with concrete thresholds, and 'when' via the explicit clause 'Use when users mention "Sandi Metz", "code quality", "refactoring", or when reviewing Ruby code for maintainability.' This matches the score-5 anchor (clear what AND when with concrete trigger phrases); the score-4 anchor requires a weaker or less explicit 'when', which does not apply here.

Trigger Term Quality

Good keyword coverage with natural phrases users would say: 'code review', 'refactoring', 'code quality', 'Sandi Metz', 'Ruby codebases', 'maintainability'. A few natural terms are missing — 'POODR', 'code smells', and the '.rb' extension appear in the body but not the description — so it falls between the good (4) and comprehensive (5) anchors, closer to 4.

Distinctiveness Conflict Risk

The 'Sandi Metz' naming and Ruby scoping give it a clear niche with distinct triggers, but generic phrases like 'code review' and 'refactoring' create minor overlap risk with general code-review/refactoring skills before the Ruby qualifier is reached. It fits 'mostly distinct; minor overlap risk with closely related skills' (4) rather than the minimal-conflict anchor (5).