Conciseness

The body is lean: terse bullet directives plus code, with no explanations of concepts Claude already knows (it never explains what Spring Security or CSRF is). Not 5 because at ~270 lines some sections could be tightened or split out (the full RateLimitFilter and CORS config code), and the "When to Activate" section partially repeats the description; not 3 because nothing is padded or over-explained.

Actionability

Nine-plus sections supply complete, copy-paste-ready Java and YAML (JwtAuthFilter, @PreAuthorize controllers, Bean Validation DTOs, parameterized queries, BCrypt bean, security-headers/CORS config, Bucket4j filter), with BAD/GOOD contrasts that make the guidance directly executable. The few thinner sections (Logging/PII, File Uploads) still give concrete, specific directives, so the common cases are fully covered.

Workflow Clarity

The structure is coherent — activation triggers, topic-by-topic sections, then a "Checklist Before Release" acting as a validation checkpoint — and the closing principle ("Deny by default, validate inputs, least privilege") anchors priorities. Not 5 because there is no explicit sequenced workflow (e.g., a step-by-step review order) and the checklist has no feedback loop for items that fail.

Progressive Disclosure

The single SKILL.md is well organized into clearly headed, self-contained topic sections that are easy to navigate, and no bundle files exist to reference. Not 5 because at 273 lines the whole skill is monolithic — bulkier material like the full rate-limiting filter implementation would fit a references file — and not 3 because the section structure is clean and nothing is buried.

Specificity

The description enumerates several concrete capability areas — "authn/authz, validation, CSRF, secrets, headers, rate limiting, and dependency security" — with only minor gaps. It stays below 5 because it names security topic areas as a noun phrase rather than multiple concrete actions (no verbs like 'Review' or 'Implement'), and above 3 because it lists seven specific topics rather than 1-2.

Completeness

The 'what' is clear (Spring Security best practices across seven named areas) but there is no 'when' — no "Use when..." clause or equivalent trigger guidance, which caps completeness at 3 per the rubric guideline. Not 4 because the 'when' is entirely absent rather than merely under-specified.

Trigger Term Quality

Good natural keyword coverage: "Spring Security", "CSRF", "validation", "secrets", "rate limiting", "Java Spring Boot" are phrases users would actually say. Not 5 because common variations and synonyms are missing — no "JWT", "OAuth2", "login", "authentication/authorization" spelled out ("authn/authz" is insider jargon a user is less likely to type).

Distinctiveness Conflict Risk

It carves out a clear niche — "Spring Security best practices ... in Java Spring Boot services" — with distinct, specific triggers (CSRF, rate limiting, dependency security) that virtually no other skill would claim. Minimal conflict risk; clearly matches the 5 anchor.