Conciseness

Lean bullet-driven body that assumes Claude's competence; it does not explain what SwiftUI or profiling is, and every section earns its tokens.

Actionability

Gives concrete, specific guidance — named smells (invalidation storms, unstable identity in ForEach, GeometryReader layout thrash) and concrete fixes (downsample images, narrow state scope, move heavy work out of body); as an instruction-only skill this meets the executable-guidance bar.

Workflow Clarity

A clear six-step sequence (Intake → Code-First Review → Profile → Analyze → Remediate → Verify) with an explicit feedback loop in Verify (re-run capture, compare with baseline) and decision checkpoints gating when to profile.

Progressive Disclosure

SKILL.md is a concise overview pointing to well-signaled one-level-deep references; all referenced files (code-smells.md, profiling-intake.md, report-template.md, plus the four Apple/WWDC docs) exist under references/ and are clearly listed in a References section.

Specificity

Lists multiple concrete actions and specific symptoms: "Audit SwiftUI runtime performance from code first" plus diagnosing "slow rendering, janky scrolling, expensive updates" — concrete rather than abstract.

Completeness

Explicitly answers both what ("Audit SwiftUI runtime performance from code first") and when ("Use when diagnosing slow rendering, janky scrolling, expensive updates, or profiling needs").

Trigger Term Quality

Includes natural terms users would say ("slow rendering", "janky scrolling", "profiling", "performance") with good coverage of common phrasings.

Distinctiveness Conflict Risk

Clearly niched to SwiftUI runtime performance auditing with distinct triggers that are unlikely to overlap with general-purpose skills.