Conciseness

The body is dense with instructions Claude does not already know (CLI commands, category slugs, provider-selection rules) and teaches no background concepts, matching 'efficient; minor instances of over-explanation that could be trimmed'. It is not a 5 because the install-before-build principle is stated three times (intro, MUST FOLLOW, the sequence header) and the intro's rhetorical emphasis ('throwaway work you will rip out') is padded relative to a lean directive.

Actionability

Guidance is fully executable: exact commands with flags ('vercel integration add <name> --no-claim', 'vercel env pull --yes', 'open <name>', 'resource claim', CI flags '--yes', '--format=json', '--no-claim'), documented aliases, and even a failure-recovery path (run the printed 'npx skills add …' command, never re-run add). Anchor 5 requires copy-paste-ready commands covering the common cases, which this meets; it is not a 4 because there are no pseudocode or missing-flag gaps.

Workflow Clarity

The sequence (categorize → discover → install → build) is explicit and ordered, with a decision checklist (MUST FOLLOW) and concrete checkpoints: 'If it needs the user's account or a dashboard/browser step → STOP and ask them to complete it, then continue', plus a feedback loop for the failed-skill-install case ('never re-run vercel integration add … have the user run only that'). This matches the 5 anchor (clear sequence, explicit validation/checkpoints, error-recovery loop, checklist); it is not a 4 because the stop-and-ask and recovery checkpoints are explicit rather than implied.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), so this scores on structure alone: the body is compact (~75 lines), split into clearly headed sections (MUST FOLLOW, The sequence, Category map, Reference, Cross-References, Official Documentation), with external doc links clearly signaled and cross-references to sibling skills in a consistent '⤳ skill:' format. Nothing is inlined that belongs in a separate file — the 20-line category map is core decision material — and all referenced paths/links are real and one level deep.

Specificity

Concrete actions are named in third person — 'discovering, installing, and managing third-party integrations via the `vercel integration` CLI' — plus an enumerated capability list (commerce, payments, observability/monitoring, messaging/email, search, CMS). It falls between anchors 4 and 5: several specific actions with the tool named, but 'managing' stays generic and coverage of the full CLI surface is not comprehensive.

Completeness

It explicitly answers both: the 'what' ('Vercel Marketplace expert guidance — discovering, installing, and managing third-party integrations via the `vercel integration` CLI') and the 'when' with a concrete 'Use when building any app that needs an external capability without a dedicated skill — commerce (...), payments (...), observability/monitoring, messaging/email, search, or CMS — or when discovering, installing, or managing integrations.' This mirrors the 5-anchor exemplar structure; it is not a 4 because the 'when' clause is explicit and enumerates concrete triggers rather than being loosely worded.

Trigger Term Quality

Natural user phrasings are present with synonyms — 'stores, storefronts, selling products', 'checkout, subscriptions, billing', 'messaging/email', 'CMS' — and the CLI name itself is a trigger. A few natural terms are missing (no provider names like Stripe/Shopify, no 'shopping cart', 'blog', 'forms'), so it matches 'good keyword coverage; a few natural terms missing' rather than comprehensive.

Distinctiveness Conflict Risk

It carves a clear niche (Vercel Marketplace / third-party integrations) and explicitly disambiguates against sibling skills with 'without a dedicated skill', keeping storage/auth/AI out of scope. Trigger phrases (commerce via marketplace, vercel integration CLI) are distinct from generic tooling skills, so conflict risk is minimal.