calculator

A Model Context Protocol (MCP) server built with mcp-framework.

Quick Start

# Install dependencies
npm install

# Build the project
npm run build

Project Structure

calculator/
├── src/
│   ├── tools/        # MCP Tools
│   │   └── ExampleTool.ts
│   └── index.ts      # Server entry point
├── package.json
└── tsconfig.json

Adding Components

The project comes with an example tool in src/tools/ExampleTool.ts. You can add more tools using the CLI:

# Add a new tool
mcp add tool my-tool

# Example tools you might create:
mcp add tool data-processor
mcp add tool api-client
mcp add tool file-handler

Tool Development

Example tool structure:

import { MCPTool } from "mcp-framework";
import { z } from "zod";

interface MyToolInput {
  message: string;
}

class MyTool extends MCPTool {
  name = "my_tool";
  description = "Describes what your tool does";

  schema = {
    message: {
      type: z.string(),
      description: "Description of this input parameter",
    },
  };

  async execute(input: MyToolInput) {
    // Your tool logic here
    return `Processed: ${input.message}`;
  }
}

export default MyTool;

Publishing to npm

1. Update your package.json:

   • Ensure name is unique and follows npm naming conventions
   • Set appropriate version
   • Add description, author, license, etc.
   • Check bin points to the correct entry file

2. Build and test locally:

   npm run build
   npm link
   calculator  # Test your CLI locally

3. Login to npm (create account if necessary):

   npm login

4. Publish your package:

   npm publish

After publishing, users can add it to their claude desktop client (read below) or run it with npx

## Using with Claude Desktop

### Installing via Smithery

To install Calculator for Claude Desktop automatically via [Smithery](https://smithery.ai/server/@QuantGeekDev/mcp-add-sse):

```bash
npx -y @smithery/cli install @QuantGeekDev/mcp-add-sse --client claude

Local Development

Add this configuration to your Claude Desktop config file:

MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "calculator": {
      "command": "node",
      "args":["/absolute/path/to/calculator/dist/index.js"]
    }
  }
}

After Publishing

Add this configuration to your Claude Desktop config file:

MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "calculator": {
      "command": "npx",
      "args": ["calculator"]
    }
  }
}

Building and Testing

1. Make changes to your tools
2. Run npm run build to compile
3. The server will automatically load your tools on startup

Learn More

• MCP Framework Github
• MCP Framework Docs