AGENTS.md — `shared/` (Compose Multiplatform + KMP)

Nearest guide when editing under shared/. Root AGENTS.md still applies; this file wins for UI/KMP work.

Purpose

shared is the Compose Multiplatform app layer for Android, Windows, and Linux: Compose UI, feature ViewModels, and expect/actual platform bridges. Native transfer work goes through UniFFI VnidropCore (see crates/vnidrop). Apple platforms use the native SwiftUI app under apple/.

Compose skill (required for UI work)

For screens, components, theme, navigation, resources, ViewModel↔UI wiring, lists, animation, accessibility:

Load .codex/skills/compose-skill/SKILL.md.
Follow its workflow and defaults.
Open at most one file under .codex/skills/compose-skill/references/ when the skill’s Quick Routing table says you need deeper guidance.
Do not invent a parallel Compose style guide.

Project policy (overrides generic skill defaults)

Topic	Do this
Architecture	Keep MVVM-style ViewModels: immutable `State`, `StateFlow`, named methods*. Do not force MVI `onEvent` sealed hierarchies unless asked.
Structure	Feature packages under `com.vnidrop.app.feature.*`; thin route/wiring + screen/composables.
Theme	Only `LocalVniDropColors` / `VniDropThemeTokens` (`ui/theme/VniDropTheme.kt`). Brand primary light ≈ `#A855F7` (HSL 271, 91%, 65%).
Strings	CMP composeResources / `Res.string.*` — not Android `R` in `commonMain`.
DI	Follow existing `AppGraph` construction; no unprompted Hilt/Koin migration.
Platform	`androidMain` / `jvmMain` for pickers, SAF, NFC/QR, and desktop integration.
Dependencies	Before adding Jetpack/AndroidX to `commonMain`, verify multiplatform artifacts for all targets.

compose-skill “Existing Project Policy”: adapt to this repo; do not force-migrate.

Commands

From repo root:

make check-shared

Optional:

make test-android-host
make run-desktop
make check-android

CI :shared:jvmTest runs on Linux. Gobley host cargo follows the current host and architecture so local desktop builds embed their matching Rust library.

When Kotlin changes touch UniFFI-generated APIs, rebuild/test with a full jvmTest so Gobley/native pieces stay aligned.

Layout

src/
  commonMain/kotlin/com/vnidrop/app/
    core/                 # models, CoreGateway, FilePicker interfaces
    feature/send|receive|approvals|settings|app/
    ui/                   # theme, components, navigation, feedback, state helpers
  commonMain/composeResources/
  androidMain|jvmMain/
  commonTest|jvmTest|...

Platform file bridging (must preserve)

Android share: open content URIs as FDs; expand folder trees to per-file documents with relative displayName paths before calling Rust (FileSystemService.android.kt / expandShareDirectory).
Android receive: MediaStore Downloads sink and/or SAF tree write sink.
Apple: lives outside this module under apple/; do not add Apple platform behavior back to KMP.
Desktop: filesystem paths; directories may be marked isDirectory for Rust walk.

Never pass a directory as a single Android FD into SourceKind.FILE_DESCRIPTOR.

Code style (Kotlin)

Match existing feature style (imports, naming, state updates via update { }).
Composables render state and invoke callbacks; no business rules in @Composable bodies (network, share creation, ticket parse — ViewModel/core).
Prefer stable list keys from domain IDs.
Comments only for non-obvious platform or concurrency reasons.
Do not hard-code brand colors; use theme tokens.

Testing

Logic: src/commonTest/ (e.g. ViewModel fakes, AppUiModels progress helpers).
Compose/JVM: src/jvmTest/.
Add/adjust tests when changing state machines, progress aggregation, or share/receive eligibility.
Prefer fakes in commonTest support over real UniFFI in pure unit tests.

make test-shared

Anti-patterns

Streaming transfer bytes through Kotlin as the main design
Directory FDs on Android
New DI framework “because best practice”
Loading every compose-skill reference file for a small UI tweak
Android R.string in commonMain

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AGENTS.md — shared/ (Compose Multiplatform + KMP)