About Middy MCP
Middy MCP is an MCP server published by fredericbarthelet in the Cloud category: middy middleware for Model Context Protocol server hosting on AWS Lambda.
The repository has 40 stars and 8 forks, with the last commit a year ago. Six months or more without a commit doesn't mean the server is broken, but check the open issues before depending on it in production.
Install
git clone https://github.com/fredericbarthelet/middy-mcpThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
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- ✓README presentThe repository ships documentation.
- ✓License declaredUsable under a stated license.
- ✓Tests presentA test suite exists in the repository.
- ✓Dependencies pinnedA lockfile pins dependency versions.
- ✓No dynamic code executionSource scan found no eval, dynamic Function, or shell execution.
- !Scoped permissionsDoesn't declare a permission scope. Assume it can do anything its process can.
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README
Middy MCP
A Middy middleware for Model Context Protocol (MCP) server integration with AWS Lambda functions.
Description
Middy MCP is a middleware that enables seamless integration between AWS Lambda functions and Model Context Protocol servers. It provides a convenient way to handle MCP requests and responses within your Lambda functions using the Middy middleware framework. It supports requests sent to AWS Lambda from API Gateway (both REST API / v1 and HTTP API / v2) using the Proxy integration, as well as requests sent form an ALB.
Disclaimer: hosting your MCP server this way is only compatible with MCP clients using at least protocol version 2025-03-26.
Install
pnpm install middy-mcp
Requirements
- Node.js >= 18.0.0
- Middy >= 6.0.0
Usage
This middleware can throw HTTP exceptions, so it can be convenient to use it in combination with the @middy/http-error-handler.
Hereafter is an exemple of a minimal Lambda function handler file. Deploy this lambda as a proxy integration on a POST route of your API Gateway and you're good to go.
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";
// Create an MCP server
const server = new McpServer({
name: "Lambda hosted MCP Server",
version: "1.0.0",
});
// Add an addition tool
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());
License
This project is licensed under the MIT License - see the LICENSE file for details.
Contributing
Contributions are welcome! Please feel free to open an issue or to submit a pull request 🚀!
README fetched from the repository yesterday. The original is authoritative.