Conciseness

The body is lean and directive throughout — e.g. '`pages/xxx.tsx` -> `app/xxx/page.tsx`', '`getStaticPaths` -> `generateStaticParams()`', 'error.tsx -- error boundary (`use client` required)' — with zero padding and no explanation of concepts Claude already knows (no 'what is App Router' prose). It assumes Claude's competence and every token earns its place, matching the anchor 'Lean and efficient; assumes Claude's competence'.

Actionability

Concrete, executable guidance dominates: exact route/file mappings, import-level transformations ('`useRouter` from `next/router` -> `useRouter` + `usePathname` + `useSearchParams` from `next/navigation`'), and runnable validation commands (`npx tsc --noEmit`, `npx next build`, `npx vitest run --passWithNoTests`). This matches 'Mostly executable guidance; concrete code or commands with minor gaps' — the gap being no example of converted output (e.g. a before/after Server Component), with detail deferred to docs/ARCHITECTURE.md sections 5 and 6. Score 5 would require copy-paste-ready examples covering the common conversion cases inline.

Workflow Clarity

The 10 steps form a clear, logical sequence (analyze -> convert routing -> convert data fetching -> determine server/client -> convert imports -> create siblings -> type -> decompose -> validate) ending in an explicit validation step with three concrete commands, which satisfies the validation requirement for this file-rewriting workflow. It falls short of anchor 5 only because there is no feedback loop or error-recovery guidance (e.g. 'if the build fails, fix and re-run'), matching 'Clear sequence with most checkpoints present; minor validation gaps'.

Progressive Disclosure

This is a short, single-purpose skill with a well-organized '## Steps' section and no bundle files to split; per the simple-skill guideline, well-organized sections alone warrant a 5. Its single external pointer is clearly signaled and one level deep ('following `docs/ARCHITECTURE.md` sections 5 and 6', reiterated in step 1), with no nested reference chains.

Specificity

The description names the domain ("a component needs migration to the target architecture or framework version") but states no concrete actions — it never says what the skill actually does (convert routing, convert data fetching, create loading/error siblings). This matches the anchor 'Names the domain but actions are minimal or generic'. A score of 3 would require 1-2 concrete actions to be listed, which are absent; a score of 1 would require pure abstraction with no domain, but 'component migration' is a recognizable domain.

Completeness

Only a 'when' clause is present ('Use when a component needs migration to the target architecture or framework version') with no statement of what the skill does — the migration source (Pages Router), target (App Router), and the operations involved are all omitted. This exactly matches anchor 2's 'only when is present without what' (example: 'Use when working with documents'). Score 3 requires a clear 'what', which is missing; score 1 requires both to be missing or extremely vague, but the 'when' is at least stated.

Trigger Term Quality

It includes some relevant natural keywords ('component', 'migration', 'framework version') that a user would plausibly say, but misses the common variations and synonyms users would actually use for this skill — 'Next.js', 'Pages Router', 'App Router', 'upgrade'. This matches 'Some relevant keywords but missing common variations or synonyms'. Score 4 would require good coverage with only a few natural terms missing, but the most distinctive trigger terms (the framework names) are all absent.

Distinctiveness Conflict Risk

'Component... migration... architecture or framework version' is somewhat specific to code migration, but the phrasing is generic enough to overlap with other migration skills (database migrations, other framework upgrades, refactoring skills). This matches 'Somewhat specific but could still overlap with similar skills'. Score 4 would require mostly distinct triggers, which naming Next.js/App Router would provide but is absent.