Instruments Profiling

**Quick judgement**: This skill is a strong, focused helper for developers profiling native macOS/iOS apps with Instruments and xctrace, especially for Time Profiler and CLI-based workflows. It is best suited for users who already have Xcode tooling installed and want reliable, scriptable profiling and stack exports. **Strengths & value** - Gives precise, ready-to-use xctrace commands for launching and attaching. - Directly addresses the common and subtle issue of profiling the wrong app binary. - Shows how to export raw samples and outlines a path to automated analysis. - Includes practical Time Profiler UI tips to interpret call trees effectively. **Risks / limitations** - Limited to Apple platforms with Xcode Instruments/xctrace; not applicable to other OSes or runtimes. - Focused primarily on Time Profiler; other templates and advanced Instruments features are only indirectly covered. - XML exports can become very large; users must handle downstream processing themselves. **Recommended scenarios** - You need to profile CPU hotspots or startup performance for a macOS or iOS app. - You want deterministic, automated CLI-based profiling (CI, performance baselines, regression analysis). - You are troubleshooting why your trace seems to show the wrong app or no useful samples. - You require stack exports for custom analysis in Python/Rust or for comparison across app versions.