dsh-app-native

A general-purpose coding agent handed a mobile native codebase tends to make the same category of mistake: porting Objective-C to Swift as a side effect, dropping a jar into build.gradle, hand-editing a .pbxproj or merged manifest. Each step feels reasonable in isolation; together they are a production incident. dsh-app-native is an agent preset for DeepSeek Harness that fixes exactly this. The agent first detects which platform the workspace belongs to—iOS, Android, or HarmonyOS—then adopts that platform's discipline for language choices, build pipeline, and verification loop instead of applying one generic prompt across all three.

The persona rules are concrete per platform. On iOS it forbids ObjC-to-Swift porting, requires real compiler feedback from clangd or sourcekit-lsp, and drives UI through the simulator while confirming every action with expect_text assertions. On Android it mandates matching the module's existing language, building with the project's own Gradle wrapper, and sourcing runtime evidence from the adb install, am start, and logcat device loop. On HarmonyOS it insists on version-classified official API sources, runs arkts_check then build_project as the verification gate, and uses the hdc-bridge observe, locate, act, verify cycle on device. Across all three, a shared floor holds: no new dependency, permission, entitlement, or build configuration without asking, and never touching vendored or generated artifacts.

It is aimed at engineers who already work day-to-day in dsh on native iOS, Android, or HarmonyOS codebases and want the agent to think like a platform team member rather than a generic coder. After install the preset lands in your local $DSH_HOME directory and is selectable from any new session in any profile. The tool set is byte-identical to the standard shipped preset; only the persona block differs. Platform-specific companion tools are separate optional plugins. Without them the preset still runs; the corresponding capabilities are simply absent.