Kotlin SDK

repositories {
    mavenCentral()
}

dependencies {
    implementation("io.modelcontextprotocol:kotlin-sdk:0.4.0")
    // Add a Ktor engine — required, not included transitively
    implementation("io.ktor:ktor-client-cio:3.1.3")
    implementation("io.ktor:ktor-server-netty:3.1.3")
}

import io.modelcontextprotocol.kotlin.sdk.*

val server = Server(
    serverInfo = Implementation(name = "my-server", version = "1.0.0"),
    options = ServerOptions(
        capabilities = ServerCapabilities(
            tools = ServerCapabilities.Tools(listChanged = true)
        )
    )
)

server.addTool(
    name = "greet",
    description = "Returns a greeting for the given name"
) { request ->
    val name = request.arguments["name"]?.jsonPrimitive?.content ?: "World"
    CallToolResult(content = listOf(TextContent("Hello, $name!")))
}

import io.ktor.server.cio.*
import io.ktor.server.engine.*
import io.modelcontextprotocol.kotlin.sdk.server.*

embeddedServer(CIO, port = 3000) {
    mcpStreamableHttp { server }
}.start(wait = true)

import io.modelcontextprotocol.kotlin.sdk.server.*

server.runStdio()

import io.ktor.client.*
import io.ktor.client.plugins.sse.*
import io.modelcontextprotocol.kotlin.sdk.client.*

val httpClient = HttpClient { install(SSE) }
val client = Client(clientInfo = Implementation(name = "my-client", version = "1.0.0"))
val transport = StreamableHttpClientTransport(client = httpClient, url = "http://localhost:3000/mcp")
client.connect(transport)
val tools = client.listTools()?.tools ?: emptyList()
println(tools.map { it.name })

npx -y @modelcontextprotocol/inspector