Conciseness

The body is mostly lean (a timing table, a 5-step workflow, terse anti-patterns) but contains clearly unnecessary padding: Workflow step 1's sub-bullets ('state the selected range in quick-start examples... do not substitute the Medium range') are self-referential authoring instructions that repeat the table, and the 'Canonical response anchors' section spends lines on a single bare term. This fits anchor 3 (mostly efficient but includes some unnecessary content that could be tightened) better than anchor 4's 'minor instances'.

Actionability

Mostly executable guidance: concrete duration ranges, named curves ('Curves.fastOutSlowIn', 'easeInOut'), specific APIs ('onPan', 'interactivePopGesture'), specific properties ('transform', 'opacity'), and complete runnable code in references/implementation.md. Falls short of 5 because steps like 'Verify frame rate in profiler' name no specific tool or command, leaving minor gaps.

Workflow Clarity

The 5-step workflow (choose duration → select curve → animate GPU-friendly properties → wire gestures → verify 60fps) is a clear, well-ordered sequence with a validation checkpoint ('Verify frame rate in profiler — target 60fps with no jank frames'). Missing the error-recovery loop (what to fix when jank is found) keeps it at anchor 4 rather than 5; not 3 because the sequence and a checkpoint are genuinely present.

Progressive Disclosure

Good structure: the body is an overview (timing table, workflow, anti-patterns) with executable code appropriately split into two existing, one-level-deep reference files, both reachable from the body. Minor gaps: the References section lists only animation-patterns.md while implementation.md is linked mid-workflow, and the thin 'Canonical response anchors' section is unclear in purpose, so it sits at anchor 4 rather than 5.

Specificity

The description lists several specific capabilities — 'implementing screen transitions, gesture-driven interactions, shared-element animations, or optimizing animation frame rates' — with concrete coverage areas (timing curves, transitions, gestures, performance). Not a 5 because the 'what' clause leans on the generic verb 'Apply motion design principles' rather than enumerating concrete actions, leaving minor gaps.

Completeness

It explicitly answers both questions: 'what' via 'Apply motion design principles for mobile apps covering timing curves, transitions, gestures, and performance-conscious animations' and 'when' via the concrete 'Use when' clause enumerating triggers and platforms. This matches the anchor 5 example structure closely, and it uses third-person/infinitive voice as required.

Trigger Term Quality

Natural user phrases like 'screen transitions', 'gesture-driven interactions', 'shared-element animations', 'animation frame rates', and platform names 'iOS, Android, or Flutter' are all present. A few natural synonyms are missing (e.g., 'easing', 'animated', 'micro-interactions'), keeping it just below the comprehensive anchor.

Distinctiveness Conflict Risk

The animation-focused niche with platform triggers ('iOS, Android, or Flutter') is clearly distinguishable, but 'optimizing animation frame rates' creates minor overlap risk with closely related performance skills (the body itself links flutter-performance and common-performance-engineering). Not a 5 due to that overlap; not a 3 because animation/transition/gesture triggers are distinctive enough.