Basic MCP Server with Bun

This is a minimal MCP server using Bun + TypeScript so you can quickly understand the use case.

What it includes

• echo tool: returns whatever message you send
• sum tool: adds two numbers
• word_count tool: returns character/word/line counts
• hello_prompt prompt: tiny prompt template example

Run locally

bun install
bun run start

For development mode (auto-reload):

bun run dev

Connect in Cursor MCP

Add this to your MCP config (or equivalent JSON):

{
  "mcpServers": {
    "basic-bun-mcp": {
      "command": "bun",
      "args": ["run", "C:/Users/sunda/OneDrive/Documents/mcp-boilerplates/src/index.ts"]
    }
  }
}

If your environment resolves from project root, you can also use:

{
  "mcpServers": {
    "basic-bun-mcp": {
      "command": "bun",
      "args": ["run", "src/index.ts"]
    }
  }
}

Example use

• Call echo with { "message": "Hello MCP" }
• Call sum with { "a": 2, "b": 5 }
• Call word_count with { "text": "Hello\nMCP world" }
• Use hello_prompt with { "name": "Sunda" }