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Kotlin 2.0+ development specialist covering Ktor, coroutines, Compose Multiplatform, and Kotlin-idiomatic patterns. Use when building Kotlin server apps, Android apps, or multiplatform projects.
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Token-efficient tracking for AI orchestration. CLI-first for status updates (~50 tokens), agent fallback for complex ops (~1KB). Use when: updating task status, querying blockers, creating progress files, validating phases.
AshAi extension guidelines for integrating AI capabilities with Ash Framework. Use when implementing vectorization/embeddings, exposing Ash actions as LLM tools, creating prompt-backed actions, or setting up MCP servers. Covers semantic search, LangChain integration, and structured outputs.
This skill should be used when solving hard questions, complex architectural problems, or debugging issues that benefit from GPT-5 Pro or GPT-5.1 thinking models with large file context. Use when standard Claude analysis needs deeper reasoning or extended context windows.
基于 SOC 职业分类
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| name | moai-lang-kotlin |
| description | Kotlin 2.0+ development specialist covering Ktor, coroutines, Compose Multiplatform, and Kotlin-idiomatic patterns. Use when building Kotlin server apps, Android apps, or multiplatform projects. |
| version | 1.0.0 |
| category | language |
| modularized | false |
| user-invocable | false |
| tags | ["kotlin","ktor","coroutines","compose","android","multiplatform"] |
| context7-libraries | /ktorio/ktor, /jetbrains/compose-multiplatform, /jetbrains/exposed |
| related-skills | moai-lang-java, moai-lang-swift |
| updated | "2025-12-07T00:00:00.000Z" |
| status | active |
Kotlin 2.0+ Expert - K2 compiler, coroutines, Ktor, Compose Multiplatform with Context7 integration.
Auto-Triggers: Kotlin files (.kt, .kts), Gradle Kotlin DSL (build.gradle.kts, settings.gradle.kts)
Core Capabilities:
Coroutines and Flow:
// Structured concurrency with async/await
suspend fun fetchUserWithOrders(userId: Long): UserWithOrders = coroutineScope {
val userDeferred = async { userRepository.findById(userId) }
val ordersDeferred = async { orderRepository.findByUserId(userId) }
UserWithOrders(userDeferred.await(), ordersDeferred.await())
}
// Flow for reactive streams
fun observeUsers(): Flow<User> = flow {
while (true) {
emit(userRepository.findLatest())
delay(1000)
}
}.flowOn(Dispatchers.IO)
Sealed Classes and Value Classes:
sealed interface Result<out T> {
data class Success<T>(val data: T) : Result<T>
data ( exception: Throwable) : Result<>
Loading : Result<>
}
value ( value: ) {
{ require(value > ) { } }
}
value ( value: String) {
{ require(value.contains()) { } }
}
Application Setup:
fun main() {
embeddedServer(Netty, port = 8080, host = "0.0.0.0") {
configureKoin()
configureSecurity()
configureRouting()
configureContentNegotiation()
}.start(wait = true)
}
fun Application.configureKoin() {
install(Koin) { modules(appModule) }
}
val appModule = module {
single<Database> { DatabaseFactory.create() }
single<UserRepository> { UserRepositoryImpl(get()) }
single<UserService> { UserServiceImpl(get()) }
}
fun Application.configureSecurity() {
install(Authentication) {
jwt("auth-jwt") {
realm = "User API"
verifier(JwtConfig.verifier)
validate { credential ->
if (credential.payload.audience.contains("api"))
JWTPrincipal(credential.payload) else null
}
}
}
}
fun Application.configureContentNegotiation() {
install(ContentNegotiation) {
json(Json { prettyPrint = true; ignoreUnknownKeys = true })
}
}
Routing with Authentication:
fun Application.configureRouting() {
val userService by inject<UserService>()
routing {
route("/api/v1") {
post("/auth/register") {
val request = call.receive<CreateUserRequest>()
val user = userService.create(request)
call.respond(HttpStatusCode.Created, user.toDto())
}
authenticate("auth-jwt") {
route("/users") {
get {
val page = call.parameters["page"]?.toIntOrNull() ?: 0
val size = call.parameters["size"]?.toIntOrNull() ?: 20
call.respond(userService.findAll(page, size).map { it.toDto() })
}
get("/{id}") {
val id = call.parameters["id"]?.toLongOrNull()
?: return@get call.respond(HttpStatusCode.BadRequest)
userService.findById(id)?.let { call.respond(it.toDto()) }
?: call.respond(HttpStatusCode.NotFound)
}
}
}
}
}
}
Table and Entity:
object Users : LongIdTable("users") {
val name = varchar("name", 100)
val email = varchar("email", 255).uniqueIndex()
val passwordHash = varchar("password_hash", 255)
val status = enumerationByName<UserStatus>("status", 20)
val createdAt = timestamp("created_at").defaultExpression(CurrentTimestamp())
}
class UserEntity(id: EntityID<Long>) : LongEntity(id) {
companion object : LongEntityClass<UserEntity>(Users)
var name by Users.name
var email by Users.email
var passwordHash by Users.passwordHash
var status by Users.status
var createdAt by Users.createdAt
fun toModel() = User(id.value, name, email, passwordHash, status, createdAt)
}
Repository with Coroutines:
class UserRepositoryImpl(private val database: Database) : UserRepository {
override suspend fun findById(id: Long): User? = dbQuery {
UserEntity.findById(id)?.toModel()
}
override suspend fun save(user: User): User = dbQuery {
UserEntity.new {
name = user.name
email = user.email
passwordHash = user.passwordHash
status = user.status
}.toModel()
}
private suspend fun <T> dbQuery(block: suspend () -> T): T =
newSuspendedTransaction(Dispatchers.IO, database) { block() }
}
WebFlux Controller:
@RestController
@RequestMapping("/api/users")
class UserController(private val userService: UserService) {
@GetMapping
suspend fun listUsers(
@RequestParam(defaultValue = "0") page: Int,
@RequestParam(defaultValue = "20") size: Int
): Flow<UserDto> = userService.findAll(page, size).map { it.toDto() }
@GetMapping("/{id}")
suspend fun getUser(@PathVariable id: Long): ResponseEntity<UserDto> =
userService.findById(id)?.let { ResponseEntity.ok(it.toDto()) }
?: ResponseEntity.notFound().build()
@PostMapping
suspend fun createUser(@Valid @RequestBody request: CreateUserRequest): ResponseEntity<UserDto> {
val user = userService.create(request)
return ResponseEntity.created(URI.create("/api/users/${user.id}")).body(user.toDto())
}
}
Shared UI Component:
@Composable
fun UserListScreen(viewModel: UserListViewModel, onUserClick: (Long) -> Unit) {
val uiState by viewModel.uiState.collectAsState()
when (val state = uiState) {
is UiState.Loading -> LoadingIndicator()
is UiState.Success -> UserList(state.users, onUserClick)
is UiState.Error -> ErrorMessage(state.message, onRetry = viewModel::retry)
}
}
@Composable
fun UserCard(user: User, onClick: () -> Unit) {
Card(
modifier = Modifier.fillMaxWidth().clickable(onClick = onClick),
elevation = CardDefaults.cardElevation(4.dp)
) {
Row(modifier = Modifier.padding(16.dp)) {
AsyncImage(model = user.avatarUrl, contentDescription = user.name,
modifier = Modifier.size(48.dp).clip(CircleShape))
Spacer(Modifier.width(16.dp))
Column {
Text(user.name, style = MaterialTheme.typography.titleMedium)
Text(user.email, style = MaterialTheme.typography.bodySmall)
}
}
}
}
class UserServiceTest {
private val userRepository = mockk<UserRepository>()
private val userService = UserService(userRepository)
@Test
fun `should fetch user concurrently`() = runTest {
val testUser = User(1L, "John", "john@example.com")
coEvery { userRepository.findById(1L) } coAnswers { delay(100); testUser }
val result = userService.findById(1L)
assertThat(result).isEqualTo(testUser)
}
@Test
fun `should handle Flow emissions`() = runTest {
val users = listOf(User(1L, "John", "john@example.com"))
coEvery { userRepository.findAllAsFlow() } returns users.asFlow()
userService.streamUsers().toList().also { result ->
assertThat(result).hasSize(1)
}
}
}
plugins {
kotlin("jvm") version "2.0.20"
kotlin("plugin.serialization") version "2.0.20"
id("io.ktor.plugin") version "3.0.0"
}
kotlin { jvmToolchain(21) }
dependencies {
implementation("io.ktor:ktor-server-core-jvm")
implementation("io.ktor:ktor-server-netty-jvm")
implementation("io.ktor:ktor-server-content-negotiation-jvm")
implementation("io.ktor:ktor-server-auth-jwt-jvm")
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.9.0")
implementation("org.jetbrains.exposed:exposed-core:0.55.0")
implementation("org.jetbrains.exposed:exposed-dao:0.55.0")
implementation("org.postgresql:postgresql:42.7.3")
testImplementation("io.mockk:mockk:1.13.12")
testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.9.0")
testImplementation("app.cash.turbine:turbine:1.1.0")
}
Library mappings for latest documentation:
/ktorio/ktor - Ktor 3.0 server/client documentation/jetbrains/exposed - Exposed SQL framework/JetBrains/kotlin - Kotlin 2.0 language reference/Kotlin/kotlinx.coroutines - Coroutines library/jetbrains/compose-multiplatform - Compose Multiplatform/arrow-kt/arrow - Arrow functional programmingUsage:
docs = await mcp__context7__get_library_docs(
context7CompatibleLibraryID="/ktorio/ktor",
topic="routing authentication jwt",
tokens=8000
)
Use Kotlin When:
Consider Alternatives When:
moai-lang-java - Java interoperability and Spring Boot patternsmoai-domain-backend - REST API, GraphQL, microservices architecturemoai-domain-database - JPA, Exposed, R2DBC patternsmoai-quality-testing - JUnit 5, MockK, TestContainers integrationmoai-infra-docker - JVM container optimizationK2 Compiler: Add kotlin.experimental.tryK2=true to gradle.properties; clear .gradle for rebuild
Coroutines: Avoid runBlocking in suspend contexts; use Dispatchers.IO for blocking operations
Ktor: Ensure ContentNegotiation installed; check JWT verifier configuration; verify routing hierarchy
Exposed: Ensure all DB operations in transaction; be aware of entity loading outside transaction
For comprehensive reference materials:
Last Updated: 2025-12-07 Status: Production Ready (v1.0.0)