The ~1044-line body re-implements standard patterns Claude already knows (Express/Fastify setup, JWT/bcrypt auth, pg pool config, error classes) and adds a 15-item best-practices list, so it is actionable but far longer than necessary; not a 1 because it is mostly executable code rather than prose explaining known concepts.

Code blocks are complete, typed, and copy-paste ready (full controller/service/repository layers, middleware, transaction with rollback), matching the fully-executable anchor.

Content is organized into topical sections but presents a pattern catalog rather than a sequenced workflow with validation checkpoints, so it sits at the "steps listed but checkpoints missing/implicit" level.

Everything lives inline in a single monolithic file with no references/, scripts/, or assets/ bundles and no one-level-deep reference split — the classic monolithic-wall-of-text anchor; the lone "See javascript-testing-patterns skill" line does not decompose this skill's own content.

Names concrete actions across the domain — "middleware patterns, error handling, authentication, database integration, and API design best practices" — matching the multi-action anchor rather than the single-domain anchor at 2.

Explicitly answers both what (build Node.js backend services with middleware/auth/db patterns) and when ("Use when creating Node.js servers, REST APIs, GraphQL backends, or microservices architectures"), satisfying the explicit-trigger anchor.

Natural user phrasing is well covered: "Node.js servers, REST APIs, GraphQL backends, or microservices architectures" — terms a user would actually say, not technical jargon.

The Express/Fastify + Node.js backend framing carves a clear niche with distinct triggers unlikely to fire for unrelated skills; it is not a 2 because the framework-specific, server-side scope is sharply bounded.