Conciseness

The body is efficient — a decision table for wrapper selection, terse one-line rationales, and complete code with no tutorial padding. A few lines restate knowledge Claude already has (e.g., "LazyVStack and LazyHStack create views only when visible", "Never perform I/O, network calls, or heavy computation inside body"), which keeps it just below the lean-everywhere anchor 5.

Actionability

Every section provides complete, executable Swift code — a full @Observable view model, consuming view, environment injection, type-safe NavigationStack router, ViewModifier, Equatable view, and #Preview macros with mocks — covering the common cases copy-paste ready. The wrapper-selection table and anti-patterns list give concrete decision guidance.

Workflow Clarity

"When to Activate" opens with clear applicability conditions and each pattern section is unambiguous and self-contained (selection table → model → consumer → injection). It is a reference-style skill with no risky sequential workflow, so no validation checkpoints are needed, but there is also no explicit sequencing or decision flow tying sections together, keeping it below anchor 5.

Progressive Disclosure

The body is well organized with clear section headers (State Management, View Composition, Navigation, Performance, Previews, Anti-Patterns) and ends with explicitly signaled cross-skill references ("See skill: swift-actor-persistence"). There are no bundle files to split into, and the ~250-line inline content is appropriately sized for a patterns overview, but a few deep-dive sections (e.g., performance) could live in reference files to slim the overview.

Specificity

The description lists several concrete capability areas — "state management with @Observable", "view composition", "navigation", "performance optimization" — with only minor gaps (e.g., previews, environment injection). It falls just below anchor 5 because these are topic nouns rather than the fully action-verb enumeration ("Extract text and tables... fill forms...") the top anchor expects.

Completeness

It explicitly answers both what ("SwiftUI architecture patterns, state management with @Observable, view composition, navigation, performance optimization...") and when with a concrete trigger clause ("Use when building or reviewing SwiftUI views, @Observable state, navigation, or render performance").

Trigger Term Quality

Natural user phrases like "building or reviewing SwiftUI views", "@Observable state", "navigation", and "render performance" give good keyword coverage. A few natural synonyms are missing (e.g., "iOS app UI", "Swift UI" spacing variant, "list performance"), so it does not reach anchor 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

"SwiftUI" plus "@Observable" and "render performance" carve out a clear niche distinct from adjacent Swift skills (e.g., the referenced swift-actor-persistence and swift-protocol-di-testing), with minimal risk of triggering for the wrong skill.