cdk-serverless-mcp-server/
├── __tests__/                              # Jest tests
├── bin/                                    # CDK entry point
├── cdk-serverless-mcp-server.ts                # CDK app
├── lib/                                    # CDK stack
│   └── cdk-serverless-mcp-server-stack.ts      # CDK stack
├── src/                                    # Source code
│   └── index.mjs                               # MCP server handler
├── .gitignore                              # Git ignore file
├── cdk.json                                # CDK Project config
├── package.json                            # Project dependencies
├── package-lock.json                       # Project lock file
├── README.md                               # This documentation file

npm install

npm install -g aws-cdk

npm run test

import middy from "@middy/core";
import httpErrorHandler from "@middy/http-error-handler";
import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { z } from "zod";
import mcpMiddleware from "middy-mcp";

const server = new McpServer({
  name: "Lambda hosted MCP Server",
  version: "1.0.0",
});

server.tool("add", { a: z.number(), b: z.number() }, async ({ a, b }) => ({
  content: [{ type: "text", text: String(a + b) }],
}));

export const handler = middy()
  .use(mcpMiddleware({ server }))
  .use(httpErrorHandler());

npm run layer-dependencies-install # install dependencies for the layer

cdk bootstrap
cdk deploy

curl --location 'http://your-endpoint/dev/mcp' \
--header 'content-type: application/json' \
--header 'accept: application/json' \
--header 'jsonrpc: 2.0' \
--data '{
  "jsonrpc": "2.0",
  "method": "tools/list",
  "id": 1
}'

curl --location 'http://your-endpoint/dev/mcp' \
--header 'content-type: application/json' \
--header 'accept: application/json' \
--header 'jsonrpc: 2.0' \
--data '{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "add",
    "arguments": {
      "a": 5,
      "b": 3
    }
  }
}'