Conciseness

The body is ~540 lines that re-teach classic GoF patterns (Builder, Factory, Strategy, Observer, Decorator, Adapter) with full code — concepts and boilerplate (repeated Spring constructor-injection blocks in every class) Claude already knows — and the "Quick Reference: When to Use What" table (lines 15-27) duplicates the "Pattern Selection Guide" table (lines 520-531). This fits 'Mostly efficient but includes some unnecessary explanation or could be tightened'; it is above score 2 because prose is sparse and mostly code, but below 4 due to the duplicated table and boilerplate.

Actionability

Every pattern ships a complete, executable Java example (e.g., Builder lines 36-78, Outbox lines 285-357, CQRS command/query services lines 424-508), copy-paste ready. Minor gaps keep it below 5: several snippets reference undefined classes (EmailNotification, NotificationSender, SugarDecorator, PaymentService), and the Saga example mixes in-process ApplicationEventPublisher with @KafkaListener without showing the event wiring between them.

Workflow Clarity

This is a lookup/reference skill with no destructive or batch operations, so no validation cap applies. Pattern selection is well-guided via the decision table, "When to use CQRS" / "When NOT to use" bullets, and the anti-patterns table with better approaches. It sits at 4 rather than 5 because the two near-identical selection tables introduce mild ambiguity, and there is no guidance for proceeding after pattern selection (e.g., tradeoff checks like the idempotency note buried in the anti-patterns table).

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent) and everything is inlined in one ~540-line monolith; the under-50-lines exception for scoring 5 does not apply. The ~200 lines of enterprise patterns (Outbox, Saga, CQRS) clearly belong in a references/ file, matching 'Some structure but could be better organized; content that should be separate is inline'. It is above 2 because section headers (Creational/Behavioral/Structural/Enterprise) and the quick-reference table give real navigational structure.

Specificity

"Design patterns with Java examples - classic (Factory, Builder, Strategy, Observer, Decorator, Adapter) and enterprise/microservices (Saga, Outbox, CQRS)" enumerates nine concrete patterns across two explicit categories, comprehensively covering what the skill contains. This matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage' rather than score 4, which would require noticeable coverage gaps.

Completeness

The what is explicit and enumerated (classic and enterprise pattern lists) and the when is an explicit "Use when..." clause with three concrete trigger phrases. This matches the anchor 'Clearly and explicitly answers both what AND when with concrete trigger phrases'; it is not score 4 because the when-clause is already explicit and specific, not merely present-but-improvable.

Trigger Term Quality

The trigger clause "Use when user asks about patterns, designing extensible components, or distributed transaction strategies" includes natural phrases users would say, plus "microservices" in the what-clause. Common variations like "design patterns" as a trigger phrase, "coupling", "GoF", or "event-driven" are missing, matching 'Good keyword coverage; a few natural terms missing' rather than the comprehensive-synonym anchor at 5.

Distinctiveness Conflict Risk

Java-specific examples plus named patterns (Saga, Outbox, CQRS) establish a clear niche with minimal conflict risk. Minor overlap remains: the bare trigger "asks about patterns" could fire for non-Java or non-design-pattern queries (regex patterns, other languages), matching 'Mostly distinct; minor overlap risk with closely related skills' rather than the minimal-conflict anchor at 5.