Lean, assumes Claude's competence, and avoids explaining known concepts; the no-tools constraint is restated across the objective and behavior sections, but for a sub-50-line skill this reinforces a load-bearing rule rather than padding.

Provides concrete, copy-ready guidance — exact fallback prompts ('What did you want to know?' and 'I'd need to [read X / run Y / look up Z]...') plus good/bad usage examples — so the instruction-only direction is unambiguous and executable.

The single action is unambiguous and sequenced (parse the /btw argument; if none, ask; if unanswerable from context, give the fallback template), which the rubric allows to score 3 for simple single-task skills.

Content is split into clear, well-labeled sections (objective, behavior, quick_start, examples) with no need for external references; per the simple-skills note this is sufficient for a 3.

Names concrete actions and constraints ('Answers from existing conversation context only — no tool calls, no file reads, single concise response'), which would rate 3, but the description uses second-person voice ('your current work', 'you need'), which the rubric penalizes by reducing specificity by 1.

Explicitly answers both what it does ('Answers from existing conversation context only — no tool calls') and when to use it ('Use when you need a fast answer from what is already in this session'), with an explicit 'Use when' trigger.

Natural phrases a user would actually say are well covered — 'quick side question', 'fast answer', 'current work', and 'main task' — matching the good-coverage anchor.

A clear niche — context-only side-question answering with explicit tool exclusion ('no tool calls, no file reads') — makes it unlikely to fire for the wrong skill.