Conciseness

At ~388 lines the body is mostly operational tables rather than padded prose (no explaining of concepts Claude already knows), but several sections could be tightened or trimmed — e.g., the Phase 0 file-to-stack detection list ('package.json → Node.js', 'Makefile → C/C++') largely restates what Claude can infer, and the three full example optimized prompts run ~100 lines combined. This sits at 'mostly efficient but includes some unnecessary explanation or could be tightened' (3) rather than the 'minor instances' of score 4.

Actionability

Guidance is fully executable for an instruction-only skill: a numbered 6-phase pipeline, concrete classification tables (intent signal words, scope heuristics, component mappings), a checkbox checklist for missing context, an exact output format with per-intent quick patterns, and three complete worked examples showing the actual optimized prompt output. This matches the copy-paste-ready, common-cases-covered score-5 anchor.

Workflow Clarity

The pipeline is explicitly sequenced (Phase 0-5) with clear handoffs (tech stack from Phase 0 feeds Phase 3/4), an explicit clarification gate ('If 3+ critical items are missing, ask up to 3 clarification questions'), a checklist for Phase 4, and a guardrail path for the 'just do it' refusal case. These feedback loops and checklists match the score-5 anchor; the skill is advisory (non-destructive), so the destructive-operation cap does not apply.

Progressive Disclosure

There are no bundle files at all (no references/, scripts/, assets/), and the body inlines large lookup catalogs that clearly belong in separate reference files — the two Phase 3 ECC component-matching tables, the tech-stack skills/agents table, and the quick-pattern table together span ~80 lines. Section structure is good, but the score-3 anchor ('content that should be separate is inline') fits better than score 4, since no detail is offloaded to navigable one-level-deep references.

Specificity

The description enumerates multiple concrete actions — 'Analyze draft prompts, detect intent and missing context, match ECC commands, skills, and agents, and output a ready-to-paste optimized prompt with diagnosis and rationale' — plus the explicit behavioral constraint 'advisory only, never executes the task'. Coverage is comprehensive and phrased in third person, matching the score-5 anchor; nothing above exists and score 4's 'minor gaps in coverage' does not apply.

Completeness

Both 'what' (the full analyze → detect → match → output pipeline with diagnosis and rationale) and 'when' (explicit 'Use when the user says...' clause with concrete trigger phrases) are clearly stated, with an additional 'not for' boundary clause. This directly matches the score-5 anchor; the missing-when cap of 3 does not apply.

Trigger Term Quality

Natural trigger phrases are covered in both English ('optimize prompt', 'improve my prompt', 'rewrite this prompt', 'help me prompt') and Chinese synonyms (优化prompt, 改进prompt, 怎么写prompt, 帮我优化这个指令), matching real user phrasing. This exceeds the score-4 anchor ('a few natural terms missing') and matches the comprehensive-synonyms pattern of the score-5 anchor.

Distinctiveness Conflict Risk

The niche is distinct (prompt optimization, not execution) and the explicit negative trigger 'not for requests to optimize code or performance' prevents the most likely mis-trigger against refactoring/performance skills. Clear niche with distinct triggers and minimal conflict risk matches the score-5 anchor; score 4's 'minor overlap risk with closely related skills' is not warranted given the boundary clause.