Conciseness

The body is mostly lean and directive, but "When to use this skill" duplicates the five trigger phrases already in the description, and "Scope: Apply recommendations based on the reference rules and good/bad examples" adds little — minor trimming opportunities rather than real padding, matching the 'efficient; minor instances that could be trimmed' anchor.

Actionability

Concrete commands are present ("Run `./mvnw compile` or `mvn compile`", "Run `./mvnw clean verify` or `mvn clean verify`") plus an explicit reference path to read, but workflow steps 2-3 remain high-level ("Identify requested outcomes, constraints, and the minimum safe set of changes", "following the reference patterns and project conventions") — mostly executable with minor gaps.

Workflow Clarity

A clear four-step sequence (read reference/assess context, gather scope, apply changes, run verification and report) with explicit checkpoints (MANDATORY compile before, SAFETY stop on failure, VERIFY after). It falls short of the 5 anchor because failure handling is only "stop immediately" with no fix-and-retry feedback loop.

Progressive Disclosure

The body is a concise overview and all detail is correctly pushed to references/403-frameworks-quarkus-validation.md (a real, one-level-deep, self-contained 296-line file with no nested .md references), which is clearly signaled both in the Constraints ("BEFORE APPLYING: Read the reference") and in a dedicated Reference section with a proper markdown link — a clear overview with well-signaled one-level-deep references.

Specificity

The description lists multiple concrete capabilities ("Bean Validation on JAX-RS resources, @Valid on parameters and CDI beans, constraint groups, @ConfigMapping validation, custom constraints, nested DTO validation, and ExceptionMapper-based error mapping") with comprehensive coverage matching the top anchor, but the rubric's explicit penalty for second-person voice ("Use when you need to design...") reduces it by one point from 5.

Completeness

It explicitly answers both what ("design, review, or improve validation in Quarkus applications" with an enumerated capability list) and when ("Use when you need to... This should trigger for requests such as..."), matching the anchor for clear and explicit what AND when with concrete trigger phrases.

Trigger Term Quality

"This should trigger for requests such as Add validation support in Quarkus; Review Quarkus validation rules; Improve request validation in Quarkus REST APIs; Add custom validation constraints in Quarkus; Validate Quarkus @ConfigMapping properties" gives comprehensive, natural phrasings a user would actually say, plus technical terms like Bean Validation and @Valid.

Distinctiveness Conflict Risk

Every capability and trigger is Quarkus-scoped (Quarkus, JAX-RS resources, @ConfigMapping, Quarkus REST APIs), creating a clear niche with minimal overlap risk against generic Bean Validation or REST skills; "Part of Plinth Toolkit" additionally situates it within its toolkit.