MCP TypeScript Boilerplate

A starting point for building MCP servers with the official @modelcontextprotocol/sdk, no wrapper framework. Extracted from a working, published server (mcp-abuseipdb).

Layers

src/
  config.ts           env loading + validation — API key, base URL, timeout
  client.ts            generic fetch wrapper — no domain knowledge, rarely needs changes
  apiClient.ts          adds this API's auth header + error unwrapping, on top of client.ts
  endpoints/            one file per API endpoint you call — HTTP shape only
    example.ts
  tools/
    types.ts           the Tool interface every tool file implements
    example.ts          one tool: schema + handler, calls into endpoints/
    index.ts             tool registry — tools[] array
  server.ts             wires the tool registry into an McpServer instance
  index.ts               entrypoint: loadConfig() → createServer() → connect stdio transport

Adapting this to a new service

1. src/config.ts — rename API_KEY to <SERVICE>_API_KEY, set the real BASE_URL
2. src/apiClient.ts — match the target API's auth scheme (header name, Bearer vs custom) and error response shape
3. src/endpoints/ — one function per endpoint, delete example.ts
4. src/tools/ — one tool per file (schema + result formatting), delete example.ts, register real tools in tools/index.ts
5. package.json — rename, update bin, description, repo URLs

Build

npm install
cp .env.example .env   # fill in API_KEY
npm run build
npm start

Design notes

• client.ts has zero domain knowledge — it should not need to change between projects
• apiClient.ts is the only layer that knows about auth and this API's error format
• endpoints/ returns typed data, tools/ formats that data as MCP content — don't blend the two
• stdio transport, so this works with Claude Desktop, Claude Code, and any other MCP-compatible client without extra setup