core-motion

The core-motion skill provides comprehensive access to iOS and watchOS device sensor data through Apple's CoreMotion framework. It enables developers to read raw sensor inputs from accelerometers, gyroscopes, and magnetometers, as well as processed motion data that fuses these sensors into meaningful device orientation and movement information. The skill handles step counting through pedometer APIs, recognizes user activities like walking, running, cycling, and driving, tracks altitude changes, supports AirPods head tracking for spatial audio experiences, and provides specialized features for watchOS including water submersion and depth sensing for diving applications.

Key capabilities include real-time sensor streaming at configurable update intervals, processed device motion with gravity-removed user acceleration and attitude information, fitness tracking through step and distance measurements, automatic activity classification, barometric altitude monitoring, and batched high-frequency motion data for workout analysis. The skill implements proper authorization handling with Info.plist configuration requirements and provides both callback-based and polling patterns for sensor data access. It emphasizes efficient battery usage through appropriate update interval selection and follows best practices like maintaining a single CMMotionManager instance per application.

This skill targets iOS and watchOS developers building fitness applications, navigation tools, games with motion controls, augmented reality experiences, health monitoring apps, and specialized watchOS diving applications. It's particularly valuable for developers who need to implement step counting, activity recognition, motion-based interactions, spatial audio head tracking with AirPods, or any application requiring precise device orientation and movement data. The skill is designed for Swift 6.3 and iOS 26+, providing modern API patterns and comprehensive sensor access.