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

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.

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