DeepSeek Harness (DSH) plugin that embeds a live iOS Simulator — or a USB-connected iPhone — into a chat conversation. It ships 22 agent tools covering device boot/shutdown, Xcode project builds, UI interaction by accessibility identity, OCR text, list/feed rows, unified logs, processes/backtraces/leaks, and SwiftUI preview hot reload. The live view is served as an MJPEG stream in a sidebar panel that accepts tap/drag input. Transport is loopback-only with HMAC-signed expiring URLs; real-device access uses WebDriverAgent over usbmux. Requires macOS with Xcode and DSH ≥ 0.1.0-rc.6. MIT-licensed. github.com/ZSeven-W/dsh-ios