bun-fun

Simple local stdio MCP server example compiled with Bun

Install dependencies

Build executable

Add to Claude Desktop

Executable:

Development:

Windows

• Config: %APPDATA%\Claude\claude_desktop_config.json

• Executable: C:\\path\\to\\bun-fun\\mcp-server.exe

• Development: C:\\path\\to\\bun-fun\\index.ts

macOS

• Config: ~/Library/Application Support/Claude/claude_desktop_config.json

• Executable: /path/to/bun-fun/mcp-server

• Development: /path/to/bun-fun/index.ts

Add to Claude Code

CLI

Executable:

Development:

Windows

• Executable: C:\\path\\to\\bun-fun\\mcp-server.exe

• Development: C:\\path\\to\\bun-fun\\index.ts

macOS/Linux

• Executable: /path/to/bun-fun/mcp-server

• Development: /path/to/bun-fun/index.ts

From Claude Desktop

To-do

• IDE examples

Available MCP Tools

This server provides the following MCP tools:

get_current_time

Returns the current time in ISO format.

Parameters: None

Example response: 2025-09-20T15:30:45.123Z

echo

Echoes back the provided message.

Parameters:

• message (string, required): The message to echo back

Example:

• Input: { "message": "Hello, world!" }

• Output: Echo: Hello, world!

add_numbers

Adds two numbers together.

Parameters:

• a (number, required): First number

• b (number, required): Second number

Example:

• Input: { "a": 5, "b": 3 }

• Output: 5 + 3 = 8