Elysia MCP Starter

A starter template for building MCP (Model Context Protocol) servers using Elysia and Bun runtime.

This starter template is based on the elysia-mcp plugin, which provides comprehensive ElysiaJS integration for the Model Context Protocol with HTTP transport support.

Purpose

This repository provides a foundation for creating MCP servers that can be used with LLM clients like Claude Desktop, Cody, or other MCP-compatible applications. It demonstrates how to implement:

• Tools: Functions that can be called by LLMs (e.g., calculator)

• Prompts: Reusable prompt templates

• Resources: Dynamic data sources that can be accessed by LLMs

Related MCP server: MCP Server Template

Directory Structure

elysia-mcp-starter/
├── src/
│   ├── index.ts          # Main application entry point
│   ├── tools/            # MCP tools (functions callable by LLMs)
│   │   └── calculate.ts  # Example calculator tool
│   ├── prompts/          # MCP prompt templates
│   │   └── hello.ts      # Example greeting prompt
│   └── resources/        # MCP resources (dynamic data sources)
│       └── news.ts       # Example news resource
├── package.json          # Project dependencies and scripts
├── tsconfig.json         # TypeScript configuration
└── README.md            # This file

Getting Started

Option 1: Using Bun Create (Recommended)

# Create a new project from the starter template
bun create https://github.com/kerlos/elysia-mcp-starter my-mcp-project

# Navigate to the project
cd my-mcp-project

# Install dependencies
bun install

# Start development server
bun run dev

Option 2: Clone Repository

1. Clone or use this template:

   git clone https://github.com/kerlos/elysia-mcp-starter.git
   cd elysia-mcp-starter

2. Install dependencies:

   bun install

3. Start the development server:

   bun run dev

The MCP server will be available at:

• Server: http://localhost:3000

• MCP endpoint: http://localhost:3000/mcp

Development

• Development server: bun run dev (with auto-reload)

• Production server: bun run start

• Inspect MCP server: bun run inspect (opens MCP inspector)

Adding New Components

Tools

Add new tools in src/tools/ and register them in src/index.ts:

import { registerYourTool } from './tools/your-tool';
// ... in setupServer:
registerYourTool(server);

Prompts

Add new prompts in src/prompts/ and register them in src/index.ts:

import { registerYourPrompt } from './prompts/your-prompt';
// ... in setupServer:
registerYourPrompt(server);

Resources

Add new resources in src/resources/ and register them in src/index.ts:

import { registerYourResource } from './resources/your-resource';
// ... in setupServer:
registerYourResource(server);

Using with LLM Clients

Configure your MCP-compatible client to connect to http://localhost:3000/mcp to access the tools, prompts, and resources provided by this server.

MCP Client Configuration

Add the following configuration to your MCP client's configuration file:

For Claude Desktop (

{
  "mcpServers": {
    "elysia-mcp-starter": {
      "type": "http",
      "url": "http://localhost:3000/mcp"
    }
  }
}

For Cursor (

{
  "mcpServers": {
    "elysia-mcp-starter": {
      "type": "http",
      "url": "http://localhost:3000/mcp"
    }
  }
}

For Cody (VS Code settings):

{
  "cody.experimental.mcp.servers": {
    "elysia-mcp-starter": {
      "type": "http",
      "url": "http://localhost:3000/mcp"
    }
  }
}

Replace "elysia-mcp-starter" with your preferred server name and update the URL if you're running on a different port.

License

This project is licensed under the MIT License - see the LICENSE file for details.