Conciseness

Much of the body adds genuine domain calibration (thresholds, timelines, regulatory citations), but several sections restate concepts Claude already knows — the 6M fishbone categories, the enumerated Western Electric rules, Cp/Cpk definitions, and Juran's COQ categories — plus role-scene padding ('You are a senior quality engineer with 15+ years...'). Not 2: it is not heavily padded; most content carries decision data Claude would not reliably recall. Not 4: the foundational-knowledge restatements are recurring enough that the document could be cut by a third without losing guidance value.

Actionability

Guidance is concrete and directly usable: specific thresholds ('If rework cost exceeds 60% of replacement cost, scrap'), sequenced disposition logic ('the first path that applies governs'), RCA method budgets, message templates with subject-line formats, and a bad-vs-good CAPA example ('Add torque verification step at Station 12 with calibrated torque wrench (±2%)... effective by 2025-04-15'). Not 5: the communication templates are explicitly 'brief' skeletons with an 'adapt them... before using' caveat rather than fully worked, copy-paste-ready examples. Not 3: for an instruction-only skill, the guidance is specific and executable, not vague direction.

Workflow Clarity

The 'How It Works' section gives a clear 6-step lifecycle (detect → contain → classify → investigate → dispose → verify), the CAPA section builds in explicit validation checkpoints (verification vs. validation of effectiveness, containment before RCA), and there are feedback loops for error recovery — 'If recurrence occurs, the CAPA is not effective — reopen and re-investigate. Do not close and open a new CAPA.' Not 4: checklists, escalation timelines, and recurrence-driven recovery are all explicit, matching the top anchor.

Progressive Disclosure

There are no bundle files (no references/, scripts/, or assets/) and no pointers to any — the entire knowledge base, including pure reference material (Regulatory Frameworks citations, Cost of Quality percentages, Performance Indicators tables, the 5-level supplier escalation ladder), is inlined in a ~240-line SKILL.md. Not 4: content that clearly belongs in separate reference files is inline with no one-level-deep links. Not 2: the body is well-structured with clear, navigable section headers, so it is not an unstructured wall of text.

Specificity

The description lists multiple specific concrete actions — 'NCR lifecycle and disposition, 5-Why/Ishikawa/fault-tree/8D root cause analysis, CAPA systems, SPC interpretation, AQL sampling, and supplier quality audits' — with comprehensive coverage of the domain. Not 4: there are no meaningful coverage gaps; every named capability is a distinct, concrete action rather than a generic category.

Completeness

It explicitly answers both 'what' (a full capability inventory with regulatory scope: 'Quality control and non-conformance management for regulated manufacturing (FDA 21 CFR 820, IATF 16949, AS9100)') and 'when' (a dedicated 'Use when...' clause with five concrete trigger phrases). Not 4: the when-clause is specific and multi-triggered, not merely present.

Trigger Term Quality

The 'Use when' clause uses natural phrases users would actually say ('investigating non-conformances, performing root cause analysis, managing CAPAs, interpreting SPC data, or handling supplier quality issues') and includes both acronyms and spelled-out variants (NCR, CAPA, SPC, AQL, non-conformances). Not 4: synonym and variation coverage is thorough, matching the comprehensive anchor.

Distinctiveness Conflict Risk

The regulated-manufacturing framing with named standards (FDA 21 CFR 820, IATF 16949, AS9100) carves out a clear niche, and the trigger phrases (non-conformances, CAPAs, SCARs, SPC) are domain-specific. Not 4: minimal overlap risk — these triggers would not plausibly fire a general manufacturing, coding, or documentation skill.