Conciseness

The body is efficient: it assumes Claude knows Hexagonal architecture (no concept tutorials), states a tight scope ("For Spring Boot, Quarkus, or Micronaut runtime wiring, defer to the matching framework skill"), and uses dense bullet constraints. It is not a 5 because the "When to use this skill" section duplicates the six trigger phrases already in the frontmatter description, and the Constraints bullets partially restate the "What is covered" bullets — trimming would tighten it further.

Actionability

Concrete, executable guidance is present: specific commands ("Run `./mvnw compile` or `mvn compile`", "Run `./mvnw clean verify`"), a real reference path to read first, precise dependency rules ("Domain packages must not depend on application, adapter, infrastructure, framework, persistence, web, messaging, or dependency-injection APIs"), and explicit routing targets ("`111-java-maven-dependencies`"). It falls short of 5 because no concrete example of a violation/finding or a sample ArchUnit rule snippet is included in the overview, leaving minor gaps.

Workflow Clarity

The 4-step workflow (read reference and map the codebase → identify ports/adapters/dependency direction → review violations and propose boundary-preserving changes → recommend verification and route out-of-scope work) is a clear sequence, and validation commands exist (MANDATORY compile before changes, "Run `./mvnw clean verify` or `mvn clean verify` before promoting changes") plus explicit edge-case handling ("ask a clarifying question before editing architecture-sensitive code"). It is not a 5 because the validation checkpoints live in the Constraints section rather than being embedded as feedback loops in the workflow steps themselves (no explicit 'if compile fails, fix and re-run' loop).

Progressive Disclosure

The body is a lean ~60-line overview with well-signaled, one-level-deep references: step 1 directs "Read `references/707-technologies-hexagonal-architecture.md`" and a dedicated Reference section links to it. The referenced file exists and is substantive (~417 lines) with no nested references inside it, matching the 5 anchor of a clear overview with appropriately split content and easy navigation.

Specificity

The description lists multiple concrete capabilities ("infrastructure leakage detection", "optional architecture tests", "evidence-backed remediation", "driving and driven adapters", "dependency direction"), matching the comprehensive anchor; however the second-person phrasing "Use when you need framework-agnostic Hexagonal architecture guidance..." incurs the mandated 1-point penalty from an otherwise anchor-5 base, landing at 4. It is not a 3 because the action coverage is far broader than the '1-2 concrete actions' anchor.

Completeness

It explicitly answers both questions: 'what' via the capability list ("ports and adapters boundaries, application core independence, ... infrastructure leakage detection, optional architecture tests, and evidence-backed remediation") and 'when' via "This should trigger for requests such as Review Hexagonal architecture; ..." with concrete trigger phrases. This matches the 5 anchor directly; there is no missing or weakly implied component that would drop it to 4.

Trigger Term Quality

Concrete trigger phrases are enumerated ("Review Hexagonal architecture; Review ports and adapters boundaries; Enforce dependency direction; Add ArchUnit architecture tests; Detect infrastructure leakage in domain code"), giving good natural-keyword coverage. It falls short of the 5 anchor because common user synonyms such as "clean architecture", "onion architecture", "ports & adapters" or "architecture review" phrasing variants are not covered.

Distinctiveness Conflict Risk

The niche is clear ("framework-agnostic Hexagonal architecture guidance for Java projects") with explicit routing away from framework wiring, making it mostly distinct as in the 4 anchor. It is not a 5 because phrases like "Review architecture boundaries" and "Add ArchUnit architecture tests" could plausibly overlap with a generic Java architecture-review or testing skill in the same toolkit (e.g. 111-java-maven-dependencies territory for ArchUnit additions).