Mostly efficient and focused, but the getEpoch example recurs three times (Problem, Solution, Real Example), a createService BAD/GOOD pair reiterates the same point, and sections like "Arrow Functions Don't Work" re-explain `this`-binding basics Claude already knows, so it could be tightened.

Provides fully executable before/after TypeScript snippets, a real `head-doc.ts` excerpt, and concrete BAD/GOOD patterns that are copy-paste ready with specific `this.method()` guidance.

This is a single, unambiguous refactor whose Decision Rule explicitly separates "move in" from "keep separate" conditions; per the simple-skill note a clear single action with explicit criteria scores 3, and no destructive/batch operation requires validation checkpoints.

The body is organized into clear, signaled sections with one-level-deep references in a References section ("See [Closures Are Better Privacy Than Keywords]..."); no bundle files are present, and the external article links are appropriately signaled rather than nested.

Names one concrete action ("Method shorthand in return objects for JSDoc preservation") but does not list multiple distinct actions, so it sits at the 'names domain and some actions' anchor rather than the multiple-actions anchor.

Clearly states both what it does and when to use it via an explicit "Use when factory functions have internal helpers that should expose docs, or hovering over returned methods shows no JSDoc" trigger, matching the both-what-and-when anchor.

Covers natural terms a TypeScript user would actually say — "JSDoc", "factory functions", "internal helpers", and "hovering over returned methods shows no JSDoc" — giving good trigger coverage.

Occupies a narrow, specific niche (JSDoc preservation via method shorthand) with a distinct trigger unlikely to fire for unrelated skills; the related factory-function-composition skill targets a different concern.