Building a Serverless MCP Server with AWS Lambda and Bedrock

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The Model Context Protocol (MCP) is a new specification that enables external systems to pass contextual data to AI models efficiently. A serverless approach using AWS Lambda and Amazon Bedrock provides a scalable and cost-effective way to deploy MCP servers for AI model interactions.

Setting Up an MCP Server with AWS SAM

Using the Serverless Application Model (SAM), you can quickly deploy an MCP server. Below is a step-by-step guide based on Davide De Sio’s minimal serverless MCP server setup.

Prerequisites

  • AWS Account
  • AWS SAM CLI installed (pip install aws-sam-cli)
  • Basic knowledge of YAML for IaC

SAM Template for MCP Server

AWSTemplateFormatVersion: '2010-09-09' 
Transform: AWS::Serverless-2016-10-31 
Resources: 
MCPLambdaFunction: 
Type: AWS::Serverless::Function 
Properties: 
CodeUri: mcp_lambda/ 
Handler: app.lambda_handler 
Runtime: python3.9 
Events: 
ApiEvent: 
Type: Api 
Properties: 
Path: /mcp 
Method: POST

Lambda Function Code (Python)

import json

def lambda_handler(event, context): 
 Parse MCP request 
mcp_data = json.loads(event['body'])

Process context and interact with Amazon Bedrock 
response = { 
"statusCode": 200, 
"body": json.dumps({"message": "MCP request processed", "data": mcp_data}) 
} 
return response

Deploying the MCP Server

1. Initialize SAM project:

sam init --name mcp-server

2. Build and deploy:

sam build 
sam deploy --guided

3. Test the endpoint using `curl`:

curl -X POST https://YOUR_API_ENDPOINT/mcp -d '{"context": "sample_data"}'

You Should Know:

  • Amazon Bedrock Integration: Use the `boto3` SDK to call Bedrock models: 
    import boto3 </li>
</ul>

bedrock = boto3.client('bedrock') 
response = bedrock.invoke_model(modelId='anthropic.claude-v2', body=json.dumps(mcp_data))

    – Logging & Monitoring: Enable AWS CloudWatch for debugging: 

    aws logs tail /aws/lambda/MCPLambdaFunction --follow

    – Security Best Practices:
    – Restrict IAM policies to least privilege.
    – Use AWS WAF to protect API endpoints.

    What Undercode Say:

    Deploying an MCP server using AWS Lambda and SAM simplifies AI model integration while maintaining scalability. Key takeaways:
    – Serverless reduces operational overhead—no server management needed.
    – IaC ensures reproducibility—SAM templates make deployments consistent.
    – Monitor performance with CloudWatch and optimize Lambda memory settings.

    For further reading, check the original MCP server guide.

    Expected Output:

    A fully deployed MCP server processing AI context via AWS Lambda, integrated with Amazon Bedrock for scalable AI model interactions.

    References:

    Reported By: Darryl Ruggles – Hackers Feeds
    Extra Hub: Undercode MoN
    Basic Verification: Pass ✅

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