Conciseness

The body is dense prescriptive rules with no padding or explanation of concepts Claude already knows; every line carries non-obvious guidance such as "an unbounded backdrop filter can process far more of the scene than the visible surface" and "Do not place an independent live blur or shader behind every scrolling row".

Actionability

Guidance names specific APIs (`BackdropFilter`, `ImageFiltered`, `CustomPainter`, `FragmentProgram`) and concrete inspection steps ("inspect its `pubspec`/lockfile entry, source usage, theme contract, supported targets, and fallback"), but includes no executable snippet or command (e.g., a golden-test or profile-mode command), sitting just below the copy-paste-ready anchor 5.

Workflow Clarity

A clear Preflight → decision ladder → invariants → Verification sequence exists with a decision-reversal checkpoint ("what evidence would reverse that choice") and detailed verification criteria, but there is no explicit validate → fix → retry loop when verification fails, matching anchor 4 rather than 5.

Progressive Disclosure

Two condition-triggered references ("Read [iOS effect translation](references/ios-effect-translation.md) when a SwiftUI, Liquid Glass... reference must be reproduced") point to real, one-level-deep files with no nested references; core guidance stays inline and specialized detail is split appropriately — the anchor-5 structure.

Specificity

The description enumerates concrete capabilities ("frosted or liquid glass, backdrop blur, refraction, shaders, custom painting, glow, masks, and effect fallbacks") but offers only two action verbs ("Implement or review"), leaving minor coverage gaps relative to the comprehensive multi-action anchor 5.

Completeness

Explicitly answers both: what ("Implement or review advanced Flutter visual rendering such as...") and when ("Use when the request explicitly needs a nontrivial visual effect"), matching the anchor-5 pattern of clear what plus concrete trigger guidance.

Trigger Term Quality

Strong natural phrases users would say — "liquid glass", "backdrop blur", "shaders", "glow", "frosted" — but common synonyms such as "glassmorphism" are absent, matching anchor 4 (good coverage, a few natural terms missing) rather than the synonym-complete anchor 5.

Distinctiveness Conflict Risk

It carves a clear niche and actively routes adjacent domains away ("route art direction, ordinary styling, animation timing, and evidence-based performance diagnosis to their dedicated skills"), giving minimal conflict risk as the anchor-5 example requires.