Conciseness

The body is five lines with zero padding: every sentence ('Walk down each branch of the design tree, resolving dependencies between decisions one-by-one', 'For each question, provide your recommended answer', 'If a question can be answered by exploring the codebase, explore the codebase instead') is actionable instruction. It assumes Claude's competence and every token earns its place.

Actionability

The guidance is concrete and directive for an instruction-only skill: interrogate each design-tree branch one-by-one, recommend an answer per question, and explore the codebase instead of asking when possible. Minor gaps remain — no question format (one at a time vs. batches) and no explicit definition of what counts as reaching shared understanding — keeping it below fully copy-paste-ready guidance.

Workflow Clarity

The interview loop is coherently sequenced — walk branches in dependency order, resolve one-by-one, provide recommended answers — with an explicit termination condition ('until we reach a shared understanding') and a self-help shortcut (explore the codebase instead of asking). The checkpoint for confirming shared understanding is implicit rather than an explicit step (e.g., 'summarize the agreed plan back and confirm before finishing'), which is the minor gap against anchor 5.

Progressive Disclosure

This is a simple skill well under 50 lines with no need for external references, and the body is fully self-contained and trivially navigable — the per-rubric note allows a 5 here for clear, well-organized simple skills. Headers or reference files would add no value at this size.

Specificity

The description names the domain (plan/design interrogation) with a concrete action — 'Interview the user relentlessly... resolving each branch of the decision tree' — but this is a single action elaborated with mechanism detail rather than several distinct capabilities. It matches anchor 3 (domain plus 1-2 concrete actions) and does not list the multiple specific actions needed for a 4.

Completeness

It explicitly answers both 'what' ('Interview the user relentlessly about a plan or design until reaching shared understanding, resolving each branch of the decision tree') and 'when' with a concrete 'Use when...' clause naming explicit trigger phrases. Both are clearly and explicitly stated, matching anchor 5.

Trigger Term Quality

Natural user phrasing is present — 'stress-test a plan', 'get grilled on their design', 'grill me' — which users would genuinely say. A few natural synonyms are missing (e.g., 'poke holes in my plan', 'challenge my design', 'interrogate my design'), keeping it below the comprehensive coverage of anchor 5.

Distinctiveness Conflict Risk

The adversarial-interview niche with the distinctive 'grill me' trigger is clear and mostly distinct from related planning/review skills. Minor overlap risk remains with generic plan-review or design-critique skills via the 'stress-test a plan' phrasing, so it falls just short of anchor 5's 'clear niche with minimal conflict'.