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kotlin-mcp-server

MCP Kotlin Server Sample

A sample implementation of an MCP (Model Communication Protocol) server in Kotlin that demonstrates different server configurations and transport methods.

Features

  • Multiple server operation modes:
    • Standard I/O server
    • SSE (Server-Sent Events) server with plain configuration
    • SSE server using Ktor plugin
  • Built-in capabilities for:
    • Prompts management
    • Resources handling
    • Tools integration

Getting Started

Running the Server

To run the server in SSE mode on the port 3001, run:

./gradlew run

Connecting to the Server

For SSE servers (both plain and Ktor plugin versions):

  1. Start the server
  2. Use the MCP inspector to connect to http://localhost:<port>/sse

Server Capabilities

  • Prompts: Supports prompt management with list change notifications
  • Resources: Includes subscription support and list change notifications
  • Tools: Supports tool management with list change notifications

Implementation Details

The server is implemented using:

  • Ktor for HTTP server functionality
  • Kotlin coroutines for asynchronous operations
  • SSE for real-time communication
  • Standard I/O for command-line interface