MCPKit
MCPKit is a TypeScript library that lets you build MCP servers using decorators. Instead of manually wiring up handlers and schemas, you just decorate your methods and let the library handle the rest.
What is MCPKit?
MCPKit is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to mcpkit is a typescript library that lets you build mcp servers using decorators. instead of manually wiring up handlers and schemas, you just decorate your methods and let the library handle the rest.
MCPKit is a TypeScript library that lets you build MCP servers using decorators. Instead of manually wiring up handlers and schemas, you just decorate your methods and let the library handle the rest.
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- MCPKit is a TypeScript library that lets you build MCP serve
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx mcpkitConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use MCPKit
MCPKit is a TypeScript library that simplifies building MCP servers by providing a decorator-style API built on top of Zod for schema validation. Instead of manually wiring up transport handlers and JSON Schema definitions, you define tools with defineTool(), configure the server with defineServer(), and let MCPKit handle schema generation, input validation, and error wrapping automatically. It supports stdio and HTTP streaming transports, built-in logging, and comes with a CLI for scaffolding, hot-reload development, and inspection.
Prerequisites
- Node.js 18+ installed
- npm or npx available
- TypeScript knowledge (the library is TypeScript-first)
- Zod installed as a peer dependency
- An MCP-compatible client (Claude Desktop, Claude Code) to test your server
Scaffold a new MCP server project
Use the mcpkit CLI to generate a new project with the correct structure and dependencies pre-configured.
npx mcpkit create my-server
cd my-serverInstall dependencies
Install MCPKit and Zod into an existing project, or if using the scaffold the dependencies are already included.
npm install mcpkit zodDefine a tool
Use defineTool() with a Zod input schema. MCPKit automatically converts the Zod schema to JSON Schema and validates inputs at runtime.
import { defineTool, defineServer } from 'mcpkit';
import { z } from 'zod';
const greetTool = defineTool({
name: 'greet',
description: 'Greet a user by name',
input: z.object({ name: z.string() }),
handler: ({ name }) => `Hello, ${name}!`
});Create and start the server
Use defineServer() to configure the MCP server with your tools, then call .start() to listen on stdio.
const server = defineServer({
name: 'my-server',
version: '1.0.0',
tools: [greetTool]
});
server.start();Run with hot reload during development
Use the mcpkit dev command to run your server with automatic restart on file changes.
npx mcpkit devBuild and register with Claude Desktop
Compile your server and add it to your Claude Desktop MCP config pointing to the compiled output.
npx mcpkit buildMCPKit Examples
Client configuration
Example Claude Desktop config for a compiled MCPKit server. Replace the path with your actual project's dist/index.js.
{
"mcpServers": {
"my-server": {
"command": "node",
"args": ["/absolute/path/to/my-server/dist/index.js"]
}
}
}Prompts to try
Once your MCPKit server is running, test it with prompts that invoke your defined tools.
- "Use the greet tool to say hello to Alice"
- "Inspect my server with 'npx mcpkit inspect' to list all registered tools"
- "Run 'npx mcpkit dev' and make changes to a tool handler to see hot reload in action"
- "Add onEvent logging to the server using consoleLogger() from mcpkit"
- "Create a new tool that fetches weather data using a Zod schema for city and units inputs"Troubleshooting MCPKit
TypeScript compilation errors when defining tools
Ensure both mcpkit and zod are installed ('npm install mcpkit zod'). MCPKit requires Zod as a peer dependency. Check that your tsconfig.json has 'strict: true' and 'moduleResolution: bundler' or 'node16'.
Server starts but Claude Desktop shows no tools
Verify the path in args points to the compiled dist/index.js, not the TypeScript source. Run 'npx mcpkit build' first and confirm the dist/ directory is created. Also check that server.start() is called at the end of your entry file.
Hot reload with mcpkit dev does not pick up changes
Ensure you are editing files within the src/ directory. The dev command watches the source directory. If you restructured the project, check that the watch glob in your mcpkit configuration covers your source paths.
Frequently Asked Questions about MCPKit
What is MCPKit?
MCPKit is a Model Context Protocol (MCP) server that mcpkit is a typescript library that lets you build mcp servers using decorators. instead of manually wiring up handlers and schemas, you just decorate your methods and let the library handle the rest. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install MCPKit?
Follow the installation instructions on the MCPKit GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with MCPKit?
MCPKit works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is MCPKit free to use?
Yes, MCPKit is open source and available under the MIT License license. You can use it freely in both personal and commercial projects.
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