Conciseness

The body is dense and assumes Claude's competence — the caveats (profiler-overhead artifacts like JSLexer/Hermes, run-to-run variance thresholds, simulator-vs-device) are non-obvious knowledge that earns its tokens — but §5's cause hints ('retain cycles, unclosed resources', 'synchronous I/O, heavy layout passes, lock contention') are mild over-explanation Claude could infer, keeping it at 4 rather than 5.

Actionability

Concrete, executable tool guidance throughout — named tools with specific args ('profiler-stack-query mode=hang_stacks', 'profiler-load mode=load_native session_id=<timestamp> device_id=<UDID>') and explicit investigation chains for hang/CPU/leak — but no example response payloads are shown, a minor gap against the 5 anchor's 'specific examples cover the common cases'.

Workflow Clarity

A clearly ordered Step 0–6 sequence with an explicit validation checkpoint ('Check exportDiagnostics in the response for any export warnings') and a genuine feedback loop (re-profile via profiler-load, compare, report honestly, reconsider on no benefit) — but in-line validation checkpoints are sparse (only one explicit check), so it sits between the 4 and 5 anchors.

Progressive Disclosure

Well-organized into six clearly headed sections with easy navigation and no content that clearly belongs in a separate file; however no bundle files exist and no one-level-deep references are used, and at ~100 lines the <50-line 'well-organized sections can score 5' exception does not apply, so the 5 anchor's reference-split structure is not met.

Specificity

Names the domain and three concrete profiling targets ('CPU hotspots, UI hangs, and memory leaks') plus backends ('xctrace-backed', 'Perfetto/simpleperf'), but the single verb 'profiling' applied across targets is not the 'multiple distinct concrete actions' (e.g. extract/fill/merge/convert) of the 5 anchor.

Completeness

Clearly answers 'what' (native profiling for three target classes, iOS-only with named backends and Android roadmap) and has an explicit 'Use when diagnosing native-level performance issues' trigger; the 5 anchor is not reached because the 'when' is a single consolidated clause rather than several concrete enumerated trigger conditions.

Trigger Term Quality

Natural developer terms are present ('CPU hotspots', 'UI hangs', 'memory leaks', 'diagnosing', 'performance issues', 'native-level'), giving good coverage, but common synonyms a user might say ('jank', 'freeze', 'lag', 'FPS drops') are missing so it falls short of the 5 anchor's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The 'native-level' qualifier plus iOS-only/xctrace scope carves a clear niche with a distinct trigger, but a sibling skill (argent-react-native-profiler, referenced in the body) creates minor overlap risk with JS/React profiling, matching the 4 anchor's 'mostly distinct; minor overlap with closely related skills'.