Conciseness

The body is information-dense with no filler explaining concepts Claude already knows, but the "only 2xx counts as delivered / one non-2xx for the whole catch" rationale is repeated four times (delivery contract, Step 3 prose, Step 3 code comments, and two Common pitfalls bullets), and the two long general MCP/CLI conventions blockquotes are inlined material not specific to webhooks. Mostly efficient, but could be tightened — anchor 3 rather than 4, whose 'minor instances of over-explanation' understates the repetition.

Actionability

Fully executable throughout: complete copy-paste-ready route.ts, SDK helper, process-webhook.ts, guarded UPSERT SQL, event-ledger table and transaction code, MCP execute snippets with exact method paths, and CLI commands with --jq/--json flags down to specific error codes (409 notification_setting_cannot_be_duplicate, exit code 5 = 403). Common cases are covered concretely.

Workflow Clarity

Prerequisites then Steps 1–6 are clearly sequenced, and the "Verify the integration" section provides explicit validation checkpoints with a genuine feedback loop: run a simulation, confirm the 200, deliberately tamper with the secret, confirm the non-2xx failed delivery, restore and replay to confirm recovery — plus a real-flow end-to-end check. This is not a destructive/batch operation, so no cap applies.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), and the single SKILL.md is well-sectioned with clearly signaled one-level-deep pointers to sibling skills (subscription-sync, sandbox-testing, checkout-web, catalog-setup) and a Related docs list. The gap from 5 is the inlined general MCP/CLI conventions material that would fit a separate reference file.

Specificity

"Receive and verify Paddle webhooks in a Next.js Route Handler — signature verification, idempotency, retry semantics, and local testing" names the exact stack and several concrete capability areas. It stops short of anchor 5's multiple distinct action verbs (it is essentially one action plus topic nouns), but is well above anchor 3's single-action level.

Completeness

The "what" is clear and concrete (receive/verify Paddle webhooks in a Next.js Route Handler, with signature verification, idempotency, retries, local testing), but there is no "Use when..." clause or equivalent explicit trigger guidance, which caps completeness at 3 per the rubric guideline.

Trigger Term Quality

Natural phrases a user would actually say are present: "Paddle webhooks", "verify", "Next.js Route Handler", "signature verification", "local testing". A few natural variations are missing (e.g. "webhook endpoint", "Paddle notifications"), keeping it below anchor 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

"Paddle webhooks" plus "Next.js Route Handler" carves out a clear niche with distinct triggers; only a Paddle-specific Next.js webhook task would match, so conflict risk with other skills is minimal.