Conciseness

The body is efficient: every section is a one-line lead-in plus executable code, with no explanations of what Apple Pay is or how the framework works, and the constraint is stated once as a blockquote. Minor trim opportunities keep it at 4 rather than 5 — the Contents TOC duplicates the section headers, the 'Targets Swift 6.4 / iOS 26+' version pin is time-sensitive information not placed in a deprecation/old-patterns section, and the HIG sentence slightly over-explains.

Actionability

Fully executable, copy-paste-ready Swift for the common cases: availability check (`canMakePayments(usingNetworks:capabilities:)`), official buttons in both SwiftUI and UIKit, a complete `PKPaymentRequest` builder, the full `PKPaymentAuthorizationControllerDelegate` flow with do/catch, and `PKPass`/`PKAddPassesViewController` handling. The only stand-in is `PaymentGateway.charge(token:)`, which is explicitly commented as the user's processor (e.g. Stripe, Adyen) and is necessarily environment-specific, so it does not reduce coverage of the common cases.

Workflow Clarity

The sections form a clear setup → availability → button → request → authorize → passes sequence, with real checkpoints: the availability guard before rendering, the `containsPass` dedup check, do/catch error recovery that calls `completion` in all paths, and an explicit Review Checklist. It sits at 4 rather than 5 because the end-to-end order is implied by section arrangement and the Contents list rather than stated as an explicit ordered workflow, and there is no validate-and-retry loop for the payment-sheet flow itself; the operations here are not destructive/batch, so no cap applies.

Progressive Disclosure

Core patterns are inline and appropriately sized (~150 lines), while extended patterns are split into a single real, well-signaled, one-level-deep reference — 'Extended patterns (recurring/deferred payments, coupon codes, pass updates): references/wallet-passes.md' — which exists (304 lines, its own TOC, no further nested file references). Bundle structure is exactly SKILL.md + references/, matching the 5 anchor ('clear overview with well-signaled one-level-deep references; content appropriately split; easy navigation').

Specificity

The description lists several concrete capability areas — 'payment buttons and requests, authorization, merchant and shipping fields, pass creation or updates, Add to Wallet flows' — all anchored to the concrete PassKit domain. It falls short of the 5 anchor because the items are noun-phrase topic areas rather than fully verb-driven actions (compare 'Extract text and tables from PDF files, fill forms, merge documents'), and a few capabilities (e.g., coupon codes, pass updates via push) surface only in the reference file; it is clearly above the 3 anchor's '1-2 concrete actions'.

Completeness

It explicitly answers both questions: 'what' via 'Integrate Apple Pay and Wallet passes with PassKit' and 'when' via an explicit 'Use for ...' clause with concrete trigger contexts ('eligible physical-goods, service, donation, or recurring-payment checkout'). This matches the 5 anchor ('clearly and explicitly answers both what AND when with concrete trigger phrases') and exceeds the 4 anchor, where the 'when' would be less specific.

Trigger Term Quality

Good natural-keyword coverage: 'Apple Pay', 'Wallet passes', 'payment buttons', 'Add to Wallet', 'checkout', 'donation', 'PassKit' — phrases users would naturally say when needing this skill. A few natural terms are missing (e.g., 'Apple Wallet', '.pkpass', 'recurring billing'), so it fits the 4 anchor ('good keyword coverage; a few natural terms missing') rather than the 5 anchor's comprehensive synonym/extension coverage.

Distinctiveness Conflict Risk

'Apple Pay', 'Wallet passes', and 'PassKit' form a clear niche with distinct triggers and minimal overlap risk with other payment-related skills. No generic phrasing that would fire for unrelated skills, matching the 5 anchor ('clear niche with distinct triggers; minimal conflict risk').