The body is lean and assumes Claude's competence — it states the 'why not what' principle and immediately grounds it in concrete Good/Bad examples for READMEs, JSDoc, and code comments, with no padded library or format explanations. The minor thematic repetition of 'why not what' across sections is reinforcing a core rule in distinct contexts, so it stays level-3 rather than dropping to the 'could be tightened' level-2 anchor.

Each subsection supplies concrete, executable guidance: realistic Good/Bad markdown and TypeScript/JSDoc examples plus explicit Rules lists (e.g., 'Include @example blocks', 'Comment the why when it's not obvious'). It is not a 2 because the examples are complete and copy-pasteable rather than pseudocode or abstract description.

This is a single-purpose conventions skill with no destructive or batch operations requiring validation checkpoints, so per the simple-skill scoring note an unambiguous, well-sequenced structure scores 3. Each section follows a clear Good → Bad → Rules sequence, so it is not a 2 with implicit checkpoints.

The body is self-contained and well-organized into Folder READMEs, JSDoc Comments, and Code Comments, with a single clearly-signaled one-level reference to a sibling skill (writing-voice). No bundle files exist and there is no nested-reference indirection, matching the level-3 anchor for well-organized skills without deep external references.

Lists multiple specific concrete actions/artifacts — 'In-code documentation, folder READMEs, code comments' — rather than vague language. It is not a 2 because it enumerates several distinct concrete targets instead of naming only a domain and a single action.

It explicitly answers both 'what' (in-code documentation, folder READMEs, code comments) and 'when' via an explicit 'Use when' trigger clause. The presence of the explicit trigger guidance satisfies the level-3 anchor and avoids the cap at 2 for a missing 'Use when' clause.

The 'Use when' clause quotes natural phrases users actually say: 'document this', 'add JSDoc', 'write a README', 'explain this code', 'writing README.md/JSDoc'. Coverage of natural terms is broad, not just jargon, so it exceeds the level-2 'some relevant keywords' anchor.

It occupies a clear niche — writing documentation — with distinct triggers unlikely to fire for unrelated skills. It is not a 2 because the triggers ('add JSDoc', 'write a README', 'document this') are specific enough to avoid meaningful overlap with general code skills.