MCP Kotlin Server Sample

What is MCP Kotlin Server Sample?

MCP Kotlin Server Sample is a sample implementation of an MCP (Model Communication Protocol) server in Kotlin. It demonstrates different server configurations and transport methods for both JVM and WASM targets. It is intended for developers learning or prototyping MCP server implementations in Kotlin.

How to use MCP Kotlin Server Sample?

Run the server on JVM with ./gradlew runJvm (defaults to SSE mode with Ktor plugin on port 3001). Run on WASM (Node.js) with ./gradlew wasmJsNodeDevelopmentRun. Connect using the MCP inspector to http://localhost:<port>/sse.

Key features of MCP Kotlin Server Sample

• Supports Standard I/O, plain SSE, and Ktor plugin SSE transports
• Available on JVM and Kotlin/WASM (Node.js)
• Built-in capabilities for Prompts, Resources, and Tools
• Prompts include list change notifications
• Resources support subscriptions and list change notifications
• Tools include list change notifications

Use cases of MCP Kotlin Server Sample

• Learning how to build an MCP server in Kotlin
• Testing MCP client interactions with different transport modes
• Prototyping multiplatform MCP server configurations
• Demonstrating SSE and stdio server implementations

FAQ from MCP Kotlin Server Sample

What runtimes are supported by MCP Kotlin Server Sample?

JVM and Kotlin/WASM on Node.js.

How do I start the server?

On JVM: ./gradlew runJvm. On WASM: ./gradlew wasmJsNodeDevelopmentRun.

What transport methods are available?

Standard I/O (JVM only), SSE with plain configuration (JVM, WASM), and SSE using Ktor plugin (JVM, WASM).

What is the default port for the SSE server?

Port 3001.

How can I connect to the running server?

Use the MCP inspector and connect to http://localhost:<port>/sse.