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MCP Lambda Server

by markvp
npmGitHub
TypeScript
MIT License
112
9
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Integrations

  • Provides infrastructure for hosting MCP servers as AWS Lambda functions with streaming capabilities via Server-Sent Events (SSE), supporting Function URLs but not API Gateway or Application Load Balancer.

  • Runs MCP servers on Node.js runtime, which is officially supported for Lambda response streaming needed for the SSE transport functionality.

  • Offers TypeScript support for developing MCP servers with type definitions and interfaces to enhance development experience.

MCP Lambda Server

A Node.js package that provides MCP (Model Context Protocol) server infrastructure for AWS Lambda functions with SSE support.

Features

  • Adapts the MCP TypeScript SDK to work with AWS Lambda
  • Supports Server-Sent Events (SSE) through Lambda response streaming
  • Handles CORS and HTTP method validation
  • TypeScript support

Important Notes

  • Lambda response streaming only works with Function URLs. It does not work with API Gateway or Application Load Balancer.
  • Only Node.js runtime is officially supported for response streaming.

Installation

npm install @markvp/mcp-lambda-layer

Usage

Create your Lambda function and import the package:

import { MCPHandlerFactory } from '@markvp/mcp-lambda-layer'; import { z } from 'zod'; // Create MCP handler factory with your configuration const factory = new MCPHandlerFactory({ tools: { summarize: { params: { text: z.string(), }, handler: async ({ text }) => { // Your implementation here - could be any service/model/API const summary = await yourSummarizeImplementation(text); return { content: [{ type: 'text', text: summary }], }; }, }, }, prompts: { generate: { description: 'Generate content based on a prompt', handler: async extra => { // Your implementation here - could be any service/model/API const result = await yourGenerateImplementation(extra.prompt); return { content: [{ type: 'text', text: result }], }; }, }, }, }); // Export the handler directly export const handler = factory.getHandler();

Required Lambda Configuration

  • Runtime: Node.js 18.x or later
  • Handler: index.handler
  • Memory: 128 MB minimum (adjust based on your needs)
  • Timeout: 120 seconds recommended
  • Function URL: Required and must have response streaming enabled
  • API Gateway/ALB: Not supported with streaming

Package Contents

This package provides:

  • MCP Server implementation with SSE transport
  • Protocol handling (JSON-RPC)
  • Streaming response support
  • Type definitions and interfaces

Your Lambda function provides:

  • Tool and prompt implementations
  • Business logic
  • Any necessary API clients or services
  • Configuration

License

MIT

This server cannot be installed

-
security - not tested
A
license - permissive license
-
quality - not tested

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

A Node.js package providing Model Context Protocol server infrastructure for AWS Lambda functions with streaming response capabilities through Server-Sent Events.

  1. Features
    1. Important Notes
      1. Installation
        1. Usage
          1. Required Lambda Configuration
          2. Package Contents
        2. License

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