Instruments

Build a small agentic SwiftUI feature, profile it with the Foundation Models Instrument, and use the trace to fix prompt bloat, repeated tool calls, latency, and unsafe debugging data.

Build a field-performance loop with MetricKit reports from real devices, app-state grouping, JSON ingestion, and Instruments traces that reproduce and verify the fix.

Use Instruments' SwiftUI instrument to connect an expensive body update back to the state mutation that caused it, then fix the view instead of guessing.