Conciseness

The body is lean and fully instructional — every line directs action ('NO try/catch', 'pure functions', 'mirrors API exactly (snake_case)') with no explanations of concepts Claude already knows. Even the parenthetical '(available in both server and client in SvelteKit)' conveys project-specific knowledge, matching the anchor where every token earns its place.

Actionability

Concrete file paths ('types/[resource].types.ts', 'adapters/[resource]-adapter.ts'), a copy-paste validation command ('npx svelte-check --tsconfig ./tsconfig.json'), and specific questions to ask the user make this mostly executable. It falls short of fully executable because the actual content patterns for each artifact are delegated to docs/ARCHITECTURE.md rather than shown or templated.

Workflow Clarity

A clear 5-step sequence with an explicit creation order (a through d) and a validation checkpoint ('Validate: npx svelte-check --tsconfig ./tsconfig.json'). It does not reach 5 because there is no explicit error-recovery loop (e.g., 'if svelte-check fails, fix and re-run') after the validation step.

Progressive Disclosure

The skill is under 50 lines with no bundle files, organized under a clear '## Steps' section, and its single external reference is clearly signaled and one level deep ('docs/ARCHITECTURE.md sections 4.1 (Services), 4.2 (Adapters), 4.3 (Types)'). Per the simple-skill guidance, well-organized short content with no need for external references merits the top score.

Specificity

The phrase 'creates types, contracts, adapter, and service layer' lists four concrete deliverables that comprehensively cover the skill's data-layer scope, matching the anchor for multiple specific concrete actions with comprehensive coverage. It is not a 4 because there are no meaningful gaps in the coverage of what the skill produces.

Completeness

It explicitly answers both questions: 'Use when adding API integration to a module' provides a concrete trigger phrase, and 'creates types, contracts, adapter, and service layer' states exactly what it does. This matches the anchor requiring both what and when with concrete trigger phrases, so it exceeds the 4 anchor whose 'when' is less specific.

Trigger Term Quality

'adding API integration to a module' is a phrase a user would naturally say, and 'service layer', 'adapter', and 'types' add relevant keywords, but common variations like 'endpoint', 'connect to an API', or 'fetch data' are missing. This falls between the 'some relevant keywords' (3) and 'good keyword coverage' (4) anchors, noticeably above the midpoint.

Distinctiveness Conflict Risk

The four-artifact output list (types, contracts, adapter, service layer) carves a distinct scaffolding niche, but the trigger 'adding API integration to a module' could overlap with generic API-consumption skills. This matches 'mostly distinct; minor overlap risk with closely related skills' rather than the minimal-conflict anchor 5.