The ~240-line body is rich in specialized reference material but padded with explanatory prose ('SPC separates signal from noise. Misinterpreting charts causes more problems than not charting at all') and a role-play intro ('You are a senior quality engineer with 15+ years...') that could be trimmed; it is mostly efficient but not lean enough for the top anchor, and not a 1 because the bulk is genuine domain expertise rather than concepts Claude already knows.

Guidance is concrete and copy-paste ready: sequenced disposition logic, specific thresholds ('Cpk ≥ 1.33', 'AQL 1.0-2.5'), named templates with subject-line formats, and a concrete good/bad CAPA example ('Add torque verification step at Station 12 with calibrated torque wrench (±2%)...'), matching the fully-executable/specific-examples anchor; absence of code is acceptable for an instruction-only skill.

Multi-step processes are clearly sequenced ('How It Works' 1–6, NCR Lifecycle, NCR Disposition Decision Logic 'the first path that applies governs') with explicit validation checkpoints and a feedback loop — CAPA Effectiveness Verification requires monitoring data, recurrence check, and states 'If recurrence occurs... reopen and re-investigate', satisfying the explicit-validation/error-recovery anchor.

The body is a single monolithic SKILL.md with no bundle files or external references; it is well-organized with clear headers and tables (above the wall-of-text 1) but for a skill this large, substantial content (regulatory frameworks, templates, SPC detail) could be split into one-level-deep reference files, so it falls short of the well-signaled-reference 3.

Lists multiple specific concrete actions: 'non-conformance investigation, root cause analysis, corrective action, and supplier quality management' plus 'NCR lifecycle management, CAPA systems, SPC interpretation, and audit methodology', matching the multi-action anchor rather than the vague (1) or partial (2) levels.

It explicitly answers both 'what' ('Codified expertise for... Includes NCR lifecycle management, CAPA systems...') and 'when' with an explicit 'Use when investigating non-conformances...' trigger clause, satisfying the both-what-and-when anchor; not 2 because the trigger is explicit rather than implied.

The 'Use when' clause surfaces natural domain terms a quality engineer would actually say — 'non-conformances, performing root cause analysis, managing CAPAs, interpreting SPC data, or handling supplier quality issues' — giving good coverage of common variations, above the partial-keyword (2) anchor.

The regulated-manufacturing quality/non-conformance niche with specific triggers (NCR, CAPA, SPC, supplier quality) is clearly distinct and unlikely to fire for unrelated skills; not 2 because the triggers are narrow and specialized rather than broadly overlapping.