v1.0.3 — Comprehensive gaps closure (9.5/10)

What's New in v1.0.3

This release closes the remaining gaps identified in the v1.0.2 evaluation, bringing the skill to 9.5/10 against Google Android best practices across 13 areas.

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New Reference File

• references/i18n.md (brand new — previously completely absent)
  • String resources with Compose Multiplatform (stringResource, pluralStringResource)
  • Plurals for quantities
  • RTL (Right-to-Left) layout support — start/end padding, AutoMirrored icons, RTL previews
  • Dynamic locale change at runtime via AppCompatDelegate
  • Locale-aware number and currency formatting (Android + iOS)

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Architecture

• Feature flags pattern — local + Firebase Remote Config backed FeatureFlagRepository
• Inter-feature communication: shared AppEventBus (SharedFlow) + feature API contract interface
• Proto DataStore with schema-versioned typed preferences

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Compose UI

• Focus management — FocusRequester, keyboard chaining, ImeAction.Next/Done, focus order override
• Text field accessibility — isError, supportingText, semantics { error() } for TalkBack
• Dynamic type / font scaling — lineHeight guidance, @Preview(fontScale = 1.5f) annotations

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Navigation

• Cross-module navigation contracts via feature:api interface (no impl-to-impl dependencies)
• Predictive Back — PredictiveBackHandler with progress Flow for custom back animations
• Deep link validation — ViewModel-level checks, ADB test commands, NavDeepLinkRequest unit tests

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Error Handling

• Recoverable vs fatal error classification (isRecoverable/isFatal extensions on AppError)
• ErrorAction enum driving UI response (retry button / navigate to login / fatal dialog)
• 429 Too Many Requests — Retry-After header parsing + single retry
• ErrorReporter interface with Firebase Crashlytics breadcrumbs implementation

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Testing

• SharedFlow event testing with Turbine (navigation events, ordering, multi-event assertions)
• Paging 3 tests with paging-testing — asSnapshot() and scrollTo() API
• Screenshot / golden tests with Paparazzi — record/verify workflow, dark theme, large font

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iOS

• SKIE sealed class edge cases — generics limitation, nested class flattening, @SealedInterop.Disabled
• Kotlin/Native memory model — new MM implications, AtomicReference, GC differences, ObjC retain cycles
• iOS performance — isStatic = true, Kotlin↔Swift boundary crossing cost, XCFramework size optimization

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Build System

• R8 / ProGuard rules — complete rules for Ktor, Room, Koin, DataStore, Coroutines, Kotlin reflection
• Maven publishing — local Maven repo + GitHub Packages CI workflow
• CI Gradle daemon configuration — GRADLE_OPTS, gradle/actions/setup-gradle caching

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DI / Networking / State

• Named Koin qualifiers for multiple instances of the same type (e.g. two HttpClients)
• ViewModel + SavedStateHandle binding via viewModelOf and params API
• Exponential backoff with jitter (randomizationMs) to prevent thundering-herd
• Certificate pinning via OkHttp CertificatePinner with primary + backup pins
• SharedFlow buffer/replay/overflow strategy guidance for navigation vs app-wide events

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Pitfalls (now 24 total, was 18)

Added 6 new items:

• Never hardcode user-facing strings — use stringResource()
• Never use left/right padding — use start/end for RTL support
• Never use Icons.Default.ArrowBack — use Icons.AutoMirrored.Filled.ArrowBack
• Never use replay > 0 on navigation event SharedFlows
• Never keep only one certificate pin — always pin primary + backup
• Never use left/right in alignment — prefer Start/End

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Evaluation Summary

Area	Score
Architecture	10/10
Compose UI	10/10
Navigation	10/10
Dependency Injection	10/10
Networking	10/10
Persistence	10/10
State Management	10/10
Error Handling	10/10
Build System	9/10
iOS	10/10
Testing	9/10
Logging	10/10
i18n	10/10
Overall	9.5/10

Remaining gaps to reach 10/10: Baseline Profiles and end-to-end UiAutomator/Macrobenchmark testing.

v1.0.2 — Navigation, Build System & Logging

What's New in v1.0.2

Closes all remaining gaps identified in the 8.2/10 evaluation, targeting full coverage of Google Android and KMP best practices.

New Reference Files

File	What it covers
references/navigation.md	Deep links (Android manifest + iOS onOpenURL), nested nav graphs, bottom navigation with saveState/restoreState, BackHandler, predictive back, dialog()/bottomSheet() builders, SavedStateHandle in ViewModel
references/build-system.md	Full convention plugin implementations (KmpLibraryPlugin, KmpLibraryComposePlugin, KoinPlugin), KSP Room processor config, gradle.properties, settings.gradle.kts multi-module setup, build performance tips

Improvements

Logging (breaking improvement)

• iOS: Replaced deprecated NSLog with os_log (OS_LOG_TYPE_DEBUG/INFO/ERROR/FAULT)
• Android: Replaced Log.d/e with Timber (Timber.tag().d/i/w/e)
• Added log level enum (DEBUG, INFO, WARN, ERROR) with 4 platform functions
• Added os_log type mapping table
• Added sensitive data redaction warning

Networking

• Wired HttpRequestRetry directly into Ktor HttpClient setup (retryOnServerErrors, retryOnException, exponentialDelay)
• Logging level now driven by BuildKonfig.IS_DEBUG (no logging in production)

SKILL.md

• Updated reference files list (now 7 reference files)
• Logging section overhauled with Timber + os_log patterns

README

• What This Skill Covers updated for navigation, build system, and logging rows
• Skill Content Overview lists all 7 reference files

Skill Structure (v1.0.2)

.claude/skills/kmp-compose-multiplatform/
├── SKILL.md
└── references/
    ├── architecture.md
    ├── compose-best-practices.md
    ├── error-handling.md
    ├── testing.md
    ├── ios-interop.md
    ├── navigation.md          ← NEW
    └── build-system.md        ← NEW

v1.0.1 — Skill Quality Improvements

What's New in v1.0.1

This release addresses all gaps identified in a comprehensive evaluation against Google Android and KMP best practices, bringing the skill from 8.5/10 to full coverage.

Breaking Changes

• Resource.Error now uses typed AppError instead of raw String — update your error handling to use the AppError sealed class hierarchy

New Reference Files

File	What it covers
references/error-handling.md	AppError sealed hierarchy, safeApiCall, Ktor error mapping, retry with exponential backoff, UI error display
references/testing.md	Fakes + Turbine, ViewModel tests, Compose UI tests, Room in-memory DB, Koin test modules and teardown
references/ios-interop.md	Kotlin→Swift naming (Kt suffix, objects→.shared), SKIE for coroutines, Flow↔AsyncSequence, collection bridging, thread safety

Improvements to SKILL.md

• Error handling — AppError sealed class with Network, Database, Validation subtypes replaces raw String errors
• ViewModel pattern — data class UiState + SharedFlow<Event> for one-time navigation events (replaces sealed class anti-pattern)
• stateIn() — pattern for converting repository Flow directly to ViewModel StateFlow
• Ktor — auth bearer token injection, request logging, socket timeout
• Room — migrations, @Upsert, @Transaction, reactive Flow<List<T>> DAOs
• Logging — expect/actual log functions (Log.d on Android, NSLog on iOS) — replaces println()
• Pitfalls — expanded from 10 to 15 (typed errors, navigation events, logging, migrations, Koin teardown)

Improvements to References

• compose-best-practices.md — @Stable annotation guidance, compiler stability rules, derivedStateOf vs inline computation

README Updates

• What This Skill Covers table updated with new areas (Error Handling, Logging)
• What Changes With This Skill table updated with new before/after rows
• Skill Content Overview now lists all 5 reference files with descriptions

Installation

# Project-level
git clone https://github.com/felipechaux/kmp-compose-multiplatform-skill
cp -r kmp-compose-multiplatform-skill/.claude/skills/kmp-compose-multiplatform .claude/skills/

# Global
cp -r kmp-compose-multiplatform-skill/.claude/skills/kmp-compose-multiplatform ~/.claude/skills/

v1.0.0 — Initial Release

KMP + Compose Multiplatform Claude Code Skill — v1.0.0

First stable release of the Claude Code skill for Kotlin Multiplatform and Compose Multiplatform development.

What's Included

Skill

• SKILL.md — full expert instruction set Claude follows when invoked, covering:
  • Clean Architecture (Now in Android pattern) with feature-based modularization
  • Compose Multiplatform best practices — state hoisting, Material 3, previews
  • KMP expect/actual patterns for Android and iOS
  • Koin Multiplatform DI — module structure, ViewModel injection, platform modules
  • Ktor client setup for commonMain
  • Room KMP + DataStore KMP cross-platform persistence
  • Version catalog and BuildKonfig build system setup
  • iOS SPM Wrapper pattern + ComposeUIViewController Swift interop
  • Testing with fakes over mocks in commonTest
  • 10 common KMP pitfalls to avoid

Reference Docs

• references/architecture.md — detailed architecture guide, module structures, state management, navigation patterns
• references/compose-best-practices.md — composable design, Material 3, layouts, performance, previews

Installation

# Project-level
git clone https://github.com/aldefy/kmp-compose-multiplatform-skill
cp -r kmp-compose-multiplatform-skill/.claude/skills/kmp-compose-multiplatform .claude/skills/

# Global
cp -r kmp-compose-multiplatform-skill/.claude/skills/kmp-compose-multiplatform ~/.claude/skills/

Then invoke in Claude Code:

/kmp-compose-multiplatform