Conciseness

The core guidance (key insights, application tables, diagnostic) is dense, but there is padding: a three-paragraph "About the Authors" section covering biographies Claude already knows, Amazon affiliate-tagged "Further Reading" links, verbatim duplication ("Focus on what will not change" appears in both sections 1 and 5), and "Why it works" paragraphs that partly restate the core concept. Matches 'Mostly efficient but includes some unnecessary explanation or could be tightened' — not 2 because the tables and insights carry real, mostly non-redundant content.

Actionability

For an instruction-only skill the guidance is copy-paste ready: a 0-10 scoring rubric with defined bands and the instruction "Always provide the current score and specific improvements needed to reach 10/10", a Quick Diagnostic table with explicit if-no actions, and concrete examples ("Map 'user invites teammate' as: Settings → Invite form → Email sent → Accept link → Dashboard"; "ship a CSV export that covers 90% of use cases") covering the common cases. Matches the 5 anchor adapted for instruction skills.

Workflow Clarity

The framework stages are clearly sequenced (shaping → betting → building, sections 1-5) and the Quick Diagnostic provides a checklist, matching 'Clear sequence with most checkpoints present; minor validation gaps'. Not 5 because there is no explicit end-to-end procedure for the reviewer tying diagnostic → scoring → recommendations together; not 3 because sequence and checkpoints are clearly present.

Progressive Disclosure

A clear overview with well-signaled one-level-deep references: a Table of Contents, every section ends with a "See: [references/...]" link, and a Reference Files section lists all 7 bundle files (verified to exist, with no nested links inside them) with one-line descriptions. Matches the 5 anchor exactly.

Specificity

"Build lean, opinionated products" plus "Covers shaping, betting, building, and the art of saying no" names the domain and several specific capabilities, matching the anchor 'Lists several specific actions; minor gaps in coverage'. Not 3 (only 1-2 concrete actions) because shaping, betting, and building are distinct named capabilities; not 5 because the actions are method-stage names rather than a comprehensive set of concrete operations — the review/scoring task the body supports is not stated.

Completeness

Explicitly answers what ("Build lean, opinionated products using the 37signals philosophy... Covers shaping, betting, building") and when ("Use when the user mentions..."; "Also trigger when...") with concrete trigger phrases, exactly matching the 5 anchor. A 4 would require the 'when' to be less explicit or specific, which it is not.

Trigger Term Quality

Fourteen quoted natural trigger phrases ("Getting Real", "Shape Up", "betting table", "breadboarding", "fat marker sketch", "build less", "underdo the competition") plus behavioral triggers ("cutting scope to ship faster", "avoiding long-term roadmaps", "eliminating meetings") give comprehensive coverage of natural terms and synonyms. Clearly the top anchor; no common variation is missing.

Distinctiveness Conflict Risk

A clear niche (37signals/Shape Up method) with brand-name triggers unlikely to appear for other skills, and explicit disambiguation ("For MVP validation, see lean-startup. For design sprints, see design-sprint.") redirects the closest overlapping cases. Minimal conflict risk, matching the 5 anchor.