Conciseness

The body is dense with domain-specific API detail and assumes SwiftUI competence, with no padding explaining known concepts. Minor trimmable redundancy remains — transition-style guidance is repeated across Workflow, Core API Summary, Common Mistakes, and the Review Checklist, and prose commentary follows some examples — fitting the 4 anchor (efficient, minor instances that could be trimmed) better than the lean-everything-earns-its-place bar of 5.

Actionability

Six complete, copy-paste-ready Swift examples cover the common cases (availability-gated glass button, GlassEffectContainer grouping, matchedGeometry morphing, glassEffectUnion, tinted icon control, clear-glass contrast treatment), backed by real API signatures and modifier/button-style tables. This matches the 5 anchor (fully executable, covers common cases); it is clearly not 4 since no example is pseudocode or incomplete.

Workflow Clarity

Three request-matched paths with clear numbered sequences, and the review path includes an explicit feedback loop ("Restore the same UI fixture and rerun the checklist after each correction") plus a comprehensive checklist. However, the implement and improve paths end without any verification step (e.g. checking the pre-iOS 26 fallback renders), matching the 4 anchor (most checkpoints present, minor validation gaps) rather than 5.

Progressive Disclosure

The body is a well-organized overview (Contents TOC, Workflow, API summary, examples, mistakes, checklist) with key examples inline, while the bulk lives in a real one-level-deep bundle file references/liquid-glass.md (462 lines) that exists and is clearly signaled three times ("See references/liquid-glass.md for the full API reference with additional examples"). This matches the 5 anchor: clear overview, well-signaled single-level references, easy navigation.

Specificity

"Implement or review SwiftUI Liquid Glass for iOS 26+" names two concrete actions, and the enumeration "glass effects and containers, controls, toolbars, tab bars, morphing transitions, tinting, scroll edges, background extension, and availability fallbacks" comprehensively covers the domain's capability areas. It is not a 4 because coverage has no noticeable gaps.

Completeness

Both 'what' ("Implement or review SwiftUI Liquid Glass for iOS 26+, including...") and 'when' ("Use when adopting the Liquid Glass visual system") are explicitly present, but the when-clause is circular — it restates the skill's topic rather than naming concrete trigger situations. It matches the 4 anchor ('when' could be more explicit or specific), not 5, which demands concrete trigger phrases.

Trigger Term Quality

Good natural-keyword coverage ("SwiftUI Liquid Glass", "glass effects", "morphing transitions", "tinting", "iOS 26+", "tab bars") that users would plausibly say, but a few natural variants are missing (e.g. "glass button", "translucent", "frosted"). This fits the 4 anchor (good coverage, a few terms missing) rather than 5, which requires synonym-level comprehensiveness.

Distinctiveness Conflict Risk

"SwiftUI Liquid Glass for iOS 26+" carves out a clear niche with distinct, highly specific triggers (Liquid Glass, iOS 26, glassEffect) and minimal overlap risk with any other skill. No neighboring anchor fits better.