Conciseness

The body is rule-dense with short code blocks, tables, and no explanations of concepts Claude already knows. Minor trimmable padding exists: the "When to Use" section appears twice (once after BFRI and again at the end with the boilerplate line "This skill is applicable to execute the workflow or actions described in the overview."), plus a low-value "Skill Status" section. Not 5 because of these duplications and filler; not 3 because the bulk is lean and every section carries rules.

Actionability

Concrete TypeScript examples cover route delegation, BaseController pattern, Sentry capture, unifiedConfig import, Zod parsing, constructor DI, asyncErrorWrapper usage, plus a canonical directory tree and naming table. Not 5 because the examples are not copy-paste ready — BaseController, asyncErrorWrapper, and @/config/unifiedConfig are referenced but never defined; not 3 because nearly all guidance is executable code rather than pseudocode or high-level hints.

Workflow Clarity

A workable sequence exists: BFRI feasibility assessment (with an interpretation table that gates action, e.g., "Redesign before coding" for BFRI < 0) → implementation under the doctrine → the final Operator Validation Checklist ("[ ] BFRI ≥ 3 ... [ ] No anti-patterns present"). Not 5 because there is no explicit feedback/re-assessment loop (e.g., re-score BFRI after refactoring) and the sequence is implicit across topic sections; not 3 because both a pre-implementation gate and a final validation checkpoint are present.

Progressive Disclosure

A single ~340-line SKILL.md with no references/, scripts/, or assets/ bundle files; sections are headed and navigable, but everything lives inline. Organizational flaws are visible: section numbering jumps from 1 to 3, "When to Use" is duplicated, and the undefined helper implementations (BaseController, asyncErrorWrapper, unifiedConfig) that would naturally live in reference files are simply absent. Not 4 because there are no references at all and the SKILL.md carries the full load; not 2 because the sections are clearly headed and the file is easy to navigate.

Specificity

The 'what' portion ("You are a senior backend engineer operating production-grade services under strict architectural and reliability constraints") names the domain but states no concrete capability actions — a persona statement rather than a list of what the skill does, matching anchor 2. The rubric's judging guidelines mandate a 1-point specificity penalty for second-person voice ("You are a senior backend engineer..."), reducing it to 1.

Completeness

The 'when' is explicit and specific, but the 'what' is only a vague persona — it never states capabilities (e.g., enforcing layered architecture, Zod validation, Sentry capture, unified config). Falls between anchor 3 (weak half of what/when) and anchor 4 (both solidly present); the persona-style 'what' keeps it at 3. Not 2 because an explicit 'Use when...' clause is clearly present.

Trigger Term Quality

"Use when routes, controllers, services, repositories, express middleware, or prisma database access" provides good natural keyword coverage a backend developer would actually say. Not 5 because common variations are missing ("API", "endpoints", "Node.js", "REST", "backend"); not 3 because coverage goes well beyond 'some relevant keywords'.

Distinctiveness Conflict Risk

"express middleware" and "prisma database access" carve a clear Node.js/Prisma backend niche with distinct triggers, mostly distinguishable from adjacent skills (e.g., frontend-dev-guidelines). Not 5 because "routes, controllers, services" are generic layered-architecture terms that could overlap with other backend-framework skills; not 3 because the niche is clearly defined.