Conciseness

The effectiveFrom table, event timeline, and pitfalls are dense with every token earning its place; the one padded zone is ~45 lines of standard `@supabase/ssr` boilerplate helper code plus explanation of what the service-role client does, which the skill itself marks as optional ("if your project already has equivalent helpers, use those instead"). Not 3 — only one trimmable section; not 5 — that section is genuine over-explanation of library setup Claude already knows.

Actionability

The full Server Action is nearly copy-paste ready with auth, ownership check, `paused` branching, error mapping, revalidation, and a slim DTO, plus env vars and a 7-step verification checklist. Two minor gaps keep it below 5: `getPaddleInstance` is imported but never shown, and `undoCancelSubscription` abbreviates its auth/ownership steps as "Run the same auth and ownership checks" rather than being standalone.

Workflow Clarity

Numbered steps inside the action (authenticate → verify ownership → cancel → revalidate → DTO → error handling), a clear 3-stage webhook event timeline with the warning "Don't depend on which arrives first", feedback loops for recoverable errors (409 lock → "Try again after it renews"), and an explicit verification checklist including negative tests (logged-out and forged `subscriptionId`). This is a destructive operation and validation is emphatically present.

Progressive Disclosure

Single-level structure with well-organized sections and clearly signaled cross-skill pointers (`subscription-sync`, `webhooks`, `customer-portal`) plus a Related docs list. Not 5: the ~50-line Supabase client setup and the Retain/portal alternative details are inlined in SKILL.md when they could live in a reference file.

Specificity

Names the domain ("Cancel a Paddle subscription from a Next.js Server Action") and enumerates several concrete sub-tasks ("auth, ownership check", "safe `effectiveFrom` default", "revalidation", "the `canceled` vs `scheduledChange` distinction"). Not 5 because coverage has a minor gap — the skill also implements undoing a scheduled cancellation, which the description omits.

Completeness

The "what" is explicit and detailed, but there is no "Use when..." clause or equivalent trigger guidance; the judging guidelines cap completeness at 3 for a missing explicit trigger.

Trigger Term Quality

"Cancel a Paddle subscription", "Next.js Server Action", and "revalidation" are natural phrases a user would say. Not 5: common synonyms like "unsubscribe" or "end/stop subscription" are missing.

Distinctiveness Conflict Risk

"Paddle subscription", "Next.js Server Action", and the `canceled` vs `scheduledChange` framing form a clear niche with distinct triggers; minimal overlap risk with adjacent Paddle skills (webhooks, subscription-sync).