argent-native-profiler

1. Tools and platforms

• native-profiler-start → native-profiler-stop → native-profiler-analyze: record, export, and report.
• profiler-stack-query: drill into the analyzed data (hang stacks, function callers, thread breakdown, leaks).
• profiler-load: reload an earlier session from disk.

iOS (Instruments via xctrace): simulator only; a physical iPhone is not supported. Needs full Xcode (xcrun xctrace version). Reports CPU hotspots, UI hangs and memory leaks.

Android (Perfetto): emulator or physical device. Reports CPU hotspots and UI hangs (with jank reasons and the main thread's blocking function), plus an RSS-growth signal for memory pressure: treat it as a hint to confirm, not a confirmed leak. The app must be debuggable or declare <profileable android:shell="true"/> in its manifest, or no perf_sample callstacks are captured.

argent-react-native-profiler starts native profiling alongside React profiling by default; this skill's workflow and investigation patterns apply in both cases.

2. Workflow

Complete all steps in order; do not break mid-flow.