easy-mcp

EasyMCP is usable but in beta. Please report any issues you encounter.

EasyMCP is the simplest way to create Model Context Protocol (MCP) servers in TypeScript.

It hides the plumbing, formatting, and other boilerplate definitions behind simple declarations.

Easy MCP allows you to define the bare minimum of what you need to get started. Or you can define more complex resources, templates, tools, and prompts.

Features

• Simple Express-like API: EasyMCP provides a high-level, intuitive API. Define Tools, Prompts, Resources, Resource Templates, and Roots with calls similar to defining endpoints in ExpressJS. Every possible parameter that could be optional is optional and hidden unless you need it.
• Experimental Decorators API: Automagically infers tool, prompt, and resource arguments. No input schema definition required!
• Context Object: Access MCP capabilities like logging and progress reporting through a context object in your tools.
• Great Type Safety: Better DX and fewer runtime errors.

Beta Limitations

• No support for MCP sampling, yet
• No support for SSE, yet
• No resource update notifications, yet
• Prompts technically accept inputs, but the Typescript SDK suggests they can't. So this functionality feels unfinished.

Installation

To install EasyMCP, run the following command in your project directory:

bun install

Quick Start with (Experimental) Decorators API

Also see examples/express-decorators.ts or run bun start:decorators

EasyMCP's decorator API is dead simple and infers types and input configuration automatically.

But it's experimental and may change or have not-yet-discovered problems.

import EasyMCP from "./lib/EasyMCP";
import { Tool, Resource, Prompt } from "./lib/experimental/decorators";

class MyMCP extends EasyMCP {

  @Resource("greeting/{name}")
  getGreeting(name: string) {
    return `Hello, ${name}!`;
  }

  @Prompt()
  greetingPrompt(name: string) {
    return `Generate a greeting for ${name}.`;
  }

  @Tool()
  greet(name: string, optionalContextFromServer: Context) {
    optionalContextFromServer.info(`Greeting ${name}`);
    return `Hello, ${name}!`;
  }
}

const mcp = new MyMCP({ version: "1.0.0" });

Complex Example with Decorators API

See examples/express-express.ts or run bun start:express

import EasyMCP from "./lib/EasyMCP";
import { Prompt } from "./lib/decorators/Prompt";
import { Resource } from "./lib/decorators/Resource";
import { Root } from "./lib/decorators/Root";
import { Tool } from "./lib/decorators/Tool";

@Root("/my-sample-dir/photos")
@Root("/my-root-dir", { name: "My laptop's root directory" }) // Optionally you can name the root
class ZachsMCP extends EasyMCP {
  /**
  You can declare a Tool with zero configuration. Relevant types and plumbing will be inferred and handled.

  By default, the name of the Tool will be the name of the method.
  */
  @Tool()
  simpleFunc(nickname: string, height: number) {
    return `${nickname} of ${height} height`;
  }

  /**
   * You can enhance a tool with optional data like a description.

   Due to limitations in Typescript, if you want the Tool to serialize certain inputs as optional to the Client, you need to provide an optionals list.
   */
  @Tool({
    description: "An optional description",
    optionals: ["active", "items", "age"],
  })
  middleFunc(name: string, active?: string, items?: string[], age?: number) {
    return `exampleFunc called: name ${name}, active ${active}, items ${items}, age ${age}`;
  }

  /**
   * You can also provide a schema for the input arguments of a tool, if you want full control.
   */
  @Tool({
    description: "A function with various parameter types",
    parameters: [
      {
        name: "date",
        type: "string",
        optional: false,
      },
      {
        name: "season",
        type: "string",
        optional: false,
      },
      {


... [View full README on GitHub](https://github.com/zcaceres/easy-mcp#readme)