Conciseness

The body is lean with no concept explanations Claude already knows — the constraints are imperative rules ("NO PATTERN SHOPPING", "BUILD SAFETY") and the workflow is terse. It misses anchor 5 because of redundancy: the "When to use this skill" bullet list ("Apply Java design patterns", "Review REST API patterns", ...) repeats the frontmatter description's trigger phrases verbatim, and the "What is covered" list re-caps the same five domains, so a few sections could be trimmed.

Actionability

Concrete, executable guidance is present: exact build commands ("run `./mvnw compile` or `mvn compile` before refactoring and `./mvnw clean verify` or `mvn clean verify` after changes") and exact reference paths to read ("references/123-java-design-patterns.md", etc.), all of which exist on disk. It falls short of anchor 5 because the core advisory steps stay abstract — "Choose the simplest pattern that addresses the design pressure" defers all concrete pattern guidance to the references without an inline example of the expected output shape (e.g., a trade-off table or request/response sketch).

Workflow Clarity

A clear 5-step sequence (identify pressure → select reference → recommend pattern → implement → validate) with explicit validation checkpoints ("BUILD SAFETY" requires compile before/verify after, and step 5 says "Validate the outcome... Run the project build"). It does not reach anchor 5 because there is no error-recovery feedback loop (e.g., what to do when the build fails or the pattern does not fit) and no checklist for the multi-domain selection decision.

Progressive Disclosure

The SKILL.md is a concise overview with well-signaled, one-level-deep references: five topical reference files are listed as markdown links in a dedicated "Reference" section and named again in workflow step 2, all five files exist in references/, and no content that belongs in separate files is inlined. This matches the anchor-5 "clear overview with well-signaled one-level-deep references; easy navigation".

Specificity

The description lists several concrete actions ("select, review, or implement") across five named pattern domains ("classic Java design patterns, REST API patterns, Kafka and event-driven patterns, database and persistence patterns, and cross-cutting integration patterns"), giving comprehensive coverage but the actions themselves are generic verbs rather than concrete outcomes like the anchor-5 example's "fill forms, merge documents, convert pages to images". It exceeds anchor 3 (only 1-2 concrete actions) but does not fully match anchor 5's fully concrete action list.

Completeness

Both questions are answered explicitly: "what" via "select, review, or implement Java design and integration patterns — including [five domains]" and "when" via "Use when you need to... This should trigger for requests such as..." with concrete trigger phrases, exactly matching the anchor-5 example pattern. Not 4 because the "when" is fully explicit and specific, not merely present.

Trigger Term Quality

Explicit natural trigger phrases are present ("Apply Java design patterns; Review REST API patterns; Design Kafka event-driven patterns; Improve database persistence patterns; Add resilient integration patterns") with good keyword coverage (Kafka, REST API, event-driven, persistence). It falls short of anchor 5's "comprehensive coverage of natural terms including synonyms" — common variations users would say such as "refactor", "singleton/factory", "GoF", or "Spring" are missing.

Distinctiveness Conflict Risk

The Java-specific framing ("Java design and integration patterns") carves a clear niche with distinct triggers, but sub-triggers like "Review REST API patterns" and "Improve database persistence patterns" could overlap with generic API-review or database-tuning skills — matching anchor 4's "mostly distinct; minor overlap risk with closely related skills" rather than anchor 5's minimal conflict risk.