Conciseness

The body is mostly efficient — it never explains concepts Claude already knows, and the MUST DO / MUST NOT DO lists are terse. However, the persona paragraph ('You are a principal architect with 15+ years of experience...'), the 'When to Use This Skill' section that duplicates the frontmatter description, and the maintainer/footer lines are padding that could be trimmed. It is not 5 due to these trims; not 3 because the padding is minor relative to the whole.

Actionability

Concrete, usable artifacts: a syntactically complete Mermaid diagram example, a full ADR template with alternatives and consequences, an explicit five-item output checklist, and hard behavioral rules (MUST DO / MUST NOT DO). It is not 5 because early workflow steps remain abstract — 'Gather functional, non-functional, and constraint requirements' and 'Match requirements to architectural patterns' give no concrete mechanism, deferring all detail to the references. It is clearly above 3: the templates are real and copy-paste-ready, not pseudocode.

Workflow Clarity

The Core Workflow is a clear five-step sequence with an explicit upfront checkpoint ('Verify full requirements coverage before proceeding') and an explicit error-recovery feedback loop ('If review fails, return to step 3 with recorded feedback'). This matches the anchor-5 pattern of validation step plus retry loop; anchor 4's example lacks such a feedback loop, so 4 would undersell it. This is not a destructive/batch operation, so the cap does not apply.

Progressive Disclosure

The body is an overview with core templates inline, and all five referenced files (references/architecture-patterns.md, adr-template.md, system-design.md, database-selection.md, nfr-checklist.md) exist in the bundle, are one level deep, and are clearly signaled via a table with explicit 'Load When' conditions. Navigation is trivial; no organization gaps remain, so it fits anchor 5 rather than 4.

Specificity

The description lists multiple concrete actions — 'create architecture diagrams, write Architecture Decision Records (ADRs), evaluate technology trade-offs, design component interactions, and plan for scalability' — plus a second set ('microservices structuring, ADR authoring, scalability planning, and infrastructure pattern selection'), giving comprehensive, non-abstract coverage. It is not 4 because the coverage goes beyond 'minor gaps' into a full inventory of the skill's actions.

Completeness

It explicitly answers both questions: 'what' via 'Invoke to create architecture diagrams, write ADRs, evaluate technology trade-offs...' and 'when' via two explicit trigger clauses ('Use when designing new high-level system architecture, reviewing existing designs...' and 'Use for system design, architecture review, microservices structuring...'). This matches the anchor-5 example structure exactly; it is not 4 because the 'when' clauses are already explicit and concrete, not merely present.

Trigger Term Quality

Good natural keyword coverage: 'system design', 'architecture review', 'microservices', 'scalability', 'ADR', 'infrastructure pattern selection' — phrases a user would plausibly say. It is not 5 because common synonyms like 'tech stack', 'service decomposition', or 'distributed systems' are missing, and some concepts are repeated in two phrasings ('plan for scalability' / 'scalability planning') rather than broadening coverage; it is clearly above 3's 'some relevant keywords'.

Distinctiveness Conflict Risk

The description ends with an explicit boundary — 'distinct from code-level design patterns or database-only design tasks' — carving a clear niche alongside concrete, unambiguous triggers. It is not 4 because overlap risk is actively disclaimed rather than left as a minor unaddressed gap.