Conciseness

The body is lean and skill-specific — whois commands, registrar URLs, search query templates, and a recommendation format with almost no conceptual filler. A few lines tell Claude things it already knows ("Make them memorable and brandable", "Common suffixes: app, io, hq, ly...") and the 16-line worked example table could be trimmed, so it fits 'Efficient; minor instances of over-explanation that could be trimmed' rather than the perfectly lean 5.

Actionability

Guidance is copy-paste ready throughout: an executable whois pipeline with grep patterns, concrete registrar search URLs, exact WebSearch query strings, specific twitter/reddit script invocations with flags, and a fully specified recommendation output template. This matches 'Fully executable; copy-paste ready code or commands; specific examples cover the common cases'.

Workflow Clarity

The four-step sequence is explicit, and Step 1 contains real validation checkpoints: "Always check availability before presenting domains", "Only present domains that are confirmed AVAILABLE", "Mark any uncertain domains with '(unverified)'", "wait for confirmation before proceeding", plus three fallback availability methods (whois → browser → bulk check) that serve as error recovery. This matches the anchor 'Clear sequence with explicit validation steps; feedback loops for error recovery'.

Progressive Disclosure

SKILL.md stays an overview (workflow, key commands, essential caveats) while bulk detail is correctly pushed one level deep into references/registrars.md ("Detailed registrar comparison") and references/spaceship-api.md ("Spaceship API for automated domain operations") — both verified to exist and to match their labels. Structure matches 'Clear overview with well-signaled one-level-deep references; content appropriately split; easy navigation'.

Specificity

The description lists four concrete, distinct actions — "Search domains, compare prices, find promo codes, get purchase recommendations" — which comprehensively cover the skill's workflow (idea generation, price comparison, promo hunting, recommendation) with no vague filler. It matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage'; score 4 would require minor coverage gaps, but none are evident.

Completeness

Both halves are explicit: the what is the four-action opening sentence, and the when is a full "Use when user wants to buy a domain, check domain prices, find domain deals, compare registrars, or search for .ai/.com domains" clause with concrete triggers. This matches the anchor 'Clearly and explicitly answers both what AND when with concrete trigger phrases'.

Trigger Term Quality

Natural user phrases like "buy a domain", "check domain prices", "find domain deals", "compare registrars" and the specific ".ai/.com domains" give good keyword coverage. A few natural synonyms are missing (e.g., "register a domain", "domain name search", "TLD"), so it fits 'Good keyword coverage; a few natural terms missing' rather than the comprehensive 5.

Distinctiveness Conflict Risk

The domain-purchasing niche is clear and the triggers ("buy a domain", "compare registrars", ".ai/.com domains") are distinct from generic search or shopping skills, so conflict risk is minimal. It fits 'Clear niche with distinct triggers; minimal conflict risk'; the adjacent 4 anchor would require noticeable overlap with a closely related skill, which is not the case.