MCP Server Template

MCP Server Template

A TypeScript-based boilerplate for building Model Context Protocol (MCP) servers using the official SDK and Zod. It provides a structured foundation with a decoupled architecture to simplify the creation and registration of custom MCP tools.

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MCP Server Template

Template TypeScript para criacao de servidores MCP (Model Context Protocol) usando o SDK oficial @modelcontextprotocol/sdk.

Copie este repositorio como ponto de partida para qualquer novo servidor MCP. A estrutura ja esta pronta com contrato de tool, adaptador de registro e uma tool de exemplo.


Estrutura

.
├── src/
│   ├── core/
│   │   └── protocols/
│   │       └── McpTool.ts       # Interface base para todas as tools
│   ├── adapters/
│   │   └── registerMcpTools.ts  # Registra tools no McpServer
│   ├── tools/
│   │   └── HealthTool.ts        # Tool de exemplo (health check)
│   └── main.ts                  # Bootstrap do servidor (stdio)
├── claude_desktop_config.example.json
├── package.json
└── tsconfig.json

Decisoes de arquitetura

core/protocols/McpTool.ts

Contrato que toda tool deve implementar. Desacopla as tools do SDK, tornando cada uma independente e testavel.

export interface McpTool<
  TInput extends Record<string, unknown> = Record<string, unknown>,
> {
  name: string;
  description: string;
  inputSchema: McpInputSchema; // Record<string, z.ZodTypeAny>
  execute(input: TInput): Promise<string>;
}

adapters/registerMcpTools.ts

Unico ponto que conhece o McpServer. Itera sobre as tools e faz o bind via server.registerTool, mantendo o resto do codigo desacoplado do SDK.

tools/

Cada tool e uma classe que implementa McpTool. O inputSchema usa tipos Zod para que o SDK valide e documente os parametros automaticamente.

main.ts

Bootstrap do processo. Instancia o servidor, registra as tools e conecta o transporte stdio.

Regra importante: nunca use console.log — o canal stdout e reservado para o protocolo MCP. Use sempre console.error para logs.


Rodando localmente

npm install
npm run dev

Scripts

Comando Descricao
npm run dev Modo desenvolvimento com hot reload (tsx)
npm run build Compila TypeScript para build/
npm run start Executa o servidor compilado
npm run typecheck Valida tipos sem emitir arquivos

Como usar este template

1. Copie o repositorio

cp -r mcp-server-template ../meu-novo-mcp
cd ../meu-novo-mcp
npm install

2. Compile e execute

npm run build
node build/main.js

3. Configure o cliente MCP

Use claude_desktop_config.example.json como base:

{
  "mcpServers": {
    "meu-novo-mcp": {
      "command": "node",
      "args": ["/caminho/absoluto/para/meu-novo-mcp/build/main.js"]
    }
  }
}

Como adicionar uma nova tool

1. Crie a classe da tool em src/tools/

// src/tools/MinhaFerramenta.ts
import { z } from "zod";
import { McpTool } from "../core/protocols/McpTool.js";

export class MinhaFerramenta implements McpTool<{ mensagem: string }> {
  name = "minha_ferramenta";
  description = "Descricao do que esta tool faz.";

  inputSchema = {
    mensagem: z.string().describe("Texto de entrada"),
  };

  async execute(input: { mensagem: string }): Promise<string> {
    return JSON.stringify({ resultado: input.mensagem.toUpperCase() });
  }
}

2. Registre em src/main.ts

import { MinhaFerramenta } from "./tools/MinhaFerramenta.js";

registerMcpTools(server, [new HealthTool(), new MinhaFerramenta()]);

Dependencias

Pacote Finalidade
@modelcontextprotocol/sdk SDK oficial para criacao de servidores MCP
zod Validacao e tipagem dos inputs das tools
tsx Execucao de TypeScript sem build (dev)
typescript Compilador TypeScript

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