Conciseness

The ~35-line body is lean and instructional throughout — exact file paths, terse hard rules ("Service: **NO try/catch**, **NO .map()/.filter()/new Date()**"), and zero padding or explanation of concepts Claude already knows. Every token earns its place, matching the 5 anchor.

Actionability

Guidance is concrete and executable: exact filenames with conventions ("types/[resource].types.ts -- mirrors API exactly (snake_case)"), a runnable validation command ("npx tsc --noEmit"), and specific user questions with an example ("e.g. /v4/marketplace"). It falls short of 5 because the actual code shape (function signatures, file structure) is delegated to the external docs/ARCHITECTURE.md rather than shown or templated.

Workflow Clarity

A clear 5-step sequence with an interactive checkpoint (step 2 asks the user) and an explicit validation step ("5. Validate: npx tsc --noEmit"), plus strict creation ordering (a-d). It does not reach 5 because there is no error-recovery feedback loop saying what to do when tsc fails, and it is above 3 because validation is present rather than absent or implicit.

Progressive Disclosure

The skill is under 50 lines, well organized with a Steps section, and its only reference — "Read docs/ARCHITECTURE.md sections 4.1 (Services), 4.2 (Adapters), 4.3 (Types)" — is clearly signaled and one level deep. Per the rubric's simple-skill guideline, this scores 5 with just well-organized sections.

Specificity

"creates types, contracts, adapter, and service layer" lists four concrete deliverables, matching the anchor for several specific actions with minor gaps in coverage. It falls short of 5 because it omits what the integration actually covers (e.g., CRUD operations, HTTP details, validation), and exceeds 3 because it names far more than 1-2 actions.

Completeness

It explicitly answers both questions: "Use when adding API integration to a module" is a concrete when-clause and "creates types, contracts, adapter, and service layer" is a concrete what. The score-4 anchor's weakness ("'when' could be more explicit or specific") does not apply, so it matches the 5 anchor.

Trigger Term Quality

"adding API integration to a module" is a natural trigger phrase, but "contracts" and "adapter" are project jargon rather than user-natural terms, and common variations (endpoint, REST client, connect to an API) are absent — matching the anchor for some relevant keywords with missing variations. It is below 4 because natural keyword coverage is thin beyond the single "API integration" phrase.

Distinctiveness Conflict Risk

The four-artifact data-layer niche ("types, contracts, adapter, and service layer") is mostly distinct with only minor overlap risk against generic API-integration skills. It is not 5 because the trigger phrase "API integration" is fairly broad on its own.