Conciseness

The body is efficient — terse bullets plus focused code with BAD/GOOD contrasts, and it never re-teaches concepts Claude already knows (e.g., no 'what is CSRF' padding). It is not 5 because of minor trimmable boilerplate: the full constructor-injection in JwtAuthFilter and two complete filter classes add lines beyond the security point being made.

Actionability

Most sections provide concrete, executable Java (JWT filter, @PreAuthorize guards, validated DTO records, parameterized queries, PasswordEncoder bean, CORS source, Bucket4j filter) covering the common cases. It is not 5 because the `http.csrf(...)`/`http.headers(...)` snippets are fragments without the surrounding SecurityFilterChain context, and Dependency Security, Logging/PII, and File Uploads are bullet-only with no specific commands (e.g., an OWASP Dependency Check Maven invocation).

Workflow Clarity

This is a topic-organized reference rather than a multi-step procedure, and the closing 'Checklist Before Release' serves as an explicit verification checkpoint across all topic areas. It is not 5 because there is no guidance on sequencing or applying the material during a task (e.g., a review order or how to triage findings), leaving the workflow implicit; no destructive/batch cap applies.

Progressive Disclosure

The single file has clear section headers and good organization, but at ~270 lines everything is inlined with no bundle files or references at all. Complete filter implementations (JwtAuthFilter, RateLimitFilter) and per-topic deep dives are candidates for one-level-deep reference files that would keep SKILL.md a lean overview, which is exactly what the anchor-3 example (inline content that could be in a separate file) describes.

Specificity

The description enumerates seven concrete security areas ("authn/authz, validation, CSRF, secrets, headers, rate limiting, and dependency security"), which is noticeably above the '1-2 concrete actions' anchor. It falls short of 5 because the items are topic nouns rather than specific actions — no verbs state what the skill actually does with these areas.

Completeness

The 'what' is clear and specific (Spring Security best practices across enumerated areas), but there is no 'Use when...' clause or equivalent explicit trigger guidance in the description, which caps completeness at 3. It is not 2 because the 'what' is far from vague, and not 4 because 'in Java Spring Boot services' only weakly implies the 'when'.

Trigger Term Quality

Natural domain keywords are present ("Spring Security", "CSRF", "rate limiting", "secrets", "Java Spring Boot"), giving good keyword coverage. It is not 5 because common natural terms are missing or abbreviated: 'authn/authz' is jargon rather than 'authentication/authorization', and 'JWT', 'OAuth2', and 'CORS' (covered in the body) are absent.

Distinctiveness Conflict Risk

"Spring Security ... in Java Spring Boot services" carves out a clear niche with distinct triggers (Spring, Java, security-specific terms), making it unlikely to fire for non-Spring or non-security skills. Minor overlap risk with a generic Java-security skill does not materially change this.