The description lists numerous specific concrete actions and concepts: HTTP methods, resource URIs, status codes, DTOs, versioning, deprecation/sunset headers, content negotiation, pagination/sorting/filtering, Bean Validation, idempotency, ETag concurrency, HTTP caching, error handling, security, contract-first OpenAPI, controller advice, and problem details. This is highly specific and comprehensive.

Clearly answers both 'what' (design, review, or improve REST APIs with Spring Boot across a comprehensive list of concerns) and 'when' ('Use when you need to design, review, or improve REST APIs with Spring Boot' plus explicit trigger examples like 'Review Java code for Spring Boot REST API'). The 'Use when' clause is present and explicit.

Includes strong natural keywords users would say: 'REST API', 'Spring Boot', 'Java code', 'best practices', 'HTTP methods', 'status codes', 'pagination', 'OpenAPI', 'error handling', 'security'. The explicit trigger examples ('Review Java code for Spring Boot REST API', 'Apply best practices for Spring Boot REST API in Java code') cover common user phrasings well.

The description is highly specific to Spring Boot REST API design and review, with a clear niche combining Java, Spring Boot, and REST API best practices. The detailed enumeration of specific concerns (ETag concurrency, vendor media types, Bean Validation, OpenAPI Generator) makes it very unlikely to conflict with other skills.

The 'What is covered' section is essentially a table of contents that duplicates the description and adds little actionable value. The constraints and workflow sections are reasonably lean, but the bullet list of topics is verbose for what amounts to a pointer to a reference file.

The skill provides concrete build commands (./mvnw compile, mvn clean verify) and a clear workflow, but lacks any executable code examples, specific Spring Boot configuration snippets, or copy-paste-ready patterns. All concrete guidance is deferred to the reference file.

The workflow is clearly sequenced (read reference → gather scope → apply changes → verify), includes explicit validation checkpoints (compile before, verify after), has a stop condition on compilation failure, and addresses edge cases with clarifying-question guidance.

The skill correctly references a single external file (references/302-frameworks-spring-boot-rest.md) for detailed rules and examples, which is good one-level-deep disclosure. However, the bundle file was not provided, so we cannot confirm the reference exists, and the inline topic list is lengthy content that could be better organized or omitted since it's covered in the reference.