DemoDesk MCP · a tiny MCP server you can read in 2 minutes

A pretend SaaS called DemoDesk, with 8 demo customers (made-up people, no real data, no API keys). The MCP server gives Claude 3 read-only tools:

Run it

git clone https://github.com/sushmareshamwala/mcp-demo && cd mcp-demo
npm install
npm test          # starts the server like Claude would and calls all 3 tools

Related MCP server: CSM Intelligence MCP Server

Connect it to Claude Code

claude mcp add demodesk -- node /full/path/to/mcp-demo/index.js

Open Claude Code, type /mcp to see demodesk connected, then ask: "How many people signed up this week?"

Connect it to Claude Desktop

Settings → Developer → Edit Config, add:

{
  "mcpServers": {
    "demodesk": { "command": "node", "args": ["/full/path/to/mcp-demo/index.js"] }
  }
}

Restart Claude Desktop.

How it works (the whole idea)

1. index.js creates an MCP server and registers 3 tools with server.registerTool(name, { description, inputSchema }, handler).

2. Claude reads each tool's description and decides when to call it.

3. The server runs the handler and sends back text. Claude turns it into a plain-words answer.

To make your own SaaS's MCP server: replace data.js with calls to your real API or database, and keep every tool small and clearly described. Start read-only.

Built with the official TypeScript SDK @modelcontextprotocol/sdk (v1.31). MIT licence.