amazon-bedrock-agentcore-samples/04-infrastructure-as-code/cdk/python/basic-runtime

Basic AgentCore Runtime - CDK

This CDK stack deploys a basic Amazon Bedrock AgentCore Runtime with a simple Strands agent. This is the simplest possible AgentCore deployment, perfect for getting started and understanding the core concepts without additional complexity.

Table of Contents

• Overview
• Architecture
• Prerequisites
• Deployment
• Testing
• Sample Queries
• Cleanup
• Cost Estimate
• Troubleshooting
• 🤝 Contributing
• 📄 License

Overview

This CDK stack creates a minimal AgentCore deployment that includes:

• AgentCore Runtime: Hosts a simple Strands agent
• ECR Repository: Stores the Docker container image
• IAM Roles: Provides necessary permissions
• CodeBuild Project: Automatically builds the ARM64 Docker image
• Lambda Functions: Custom resources for automation

This makes it ideal for:

• Learning AgentCore basics
• Quick prototyping
• Understanding the core deployment pattern
• Building a foundation before adding complexity

Architecture

The architecture consists of:

• User: Sends questions to the agent and receives responses
• AWS CodeBuild: Builds the ARM64 Docker container image with the agent code
• Amazon ECR Repository: Stores the container image
• AgentCore Runtime: Hosts the Basic Agent container
  • Basic Agent: Simple Strands agent that processes user queries
  • Invokes Amazon Bedrock LLMs to generate responses
• IAM Roles:
  • IAM role for CodeBuild (builds and pushes images)
  • IAM role for Agent Execution (runtime permissions)

Prerequisites

AWS Account Setup

1. AWS Account: You need an active AWS account with appropriate permissions

   • Create AWS Account
   • AWS Console Access

2. AWS CLI: Install and configure AWS CLI with your credentials

   • Install AWS CLI
   • Configure AWS CLI

   aws configure
   

3. Python 3.10+ and AWS CDK v2 installed

   # Install CDK
   npm install -g aws-cdk
   
   # Verify installation
   cdk --version
   

4. CDK version 2.220.0 or later (for BedrockAgentCore support)

5. Bedrock Model Access: Enable access to Amazon Bedrock models in your AWS region

   • Bedrock Model Access Guide

6. Required Permissions: Your AWS user/role needs permissions for:

   • CloudFormation stack operations
   • ECR repository management
   • IAM role creation
   • Lambda function creation
   • CodeBuild project creation
   • BedrockAgentCore resource creation

Deployment

CDK vs CloudFormation

This is the CDK version of the basic AgentCore runtime. If you prefer CloudFormation, see the CloudFormation version.

Option 1: Quick Deploy (Recommended)

# Install dependencies
pip install -r requirements.txt

# Bootstrap CDK (first time only)
cdk bootstrap

# Deploy
cdk deploy

Option 2: Step by Step

# 1. Create and activate Python virtual environment
python3 -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

# 2. Install Python dependencies
pip install -r requirements.txt

# 3. Bootstrap CDK in your account/region (first time only)
cdk bootstrap

# 4. Synthesize the CloudFormation template (optional)
cdk synth

# 5. Deploy the stack
cdk deploy --require-approval never

# 6. Get outputs
cdk list

Deployment Time

• Expected Duration: 8-12 minutes
• Main Steps:
  • Stack creation: ~2 minutes
  • Docker image build (CodeBuild): ~5-8 minutes
  • Runtime provisioning: ~1-2 minutes

Testing

Using AWS CLI

# Get the Runtime ARN from CDK outputs
RUNTIME_ARN=$(aws cloudformation describe-stacks \
  --stack-name BasicAgentDemo \
  --region us-east-1 \
  --query 'Stacks[0].Outputs[?OutputKey==`AgentRuntimeArn`].OutputValue' \
  --output text)

# Invoke the agent
aws bedrock-agentcore invoke-agent-runtime \
  --agent-runtime-arn $RUNTIME_ARN \
  --qualifier DEFAULT \
  --payload $(echo '{"prompt": "Hello, how are you?"}' | base64) \
  response.json

# View the response
cat response.json

Using AWS Console

1. Navigate to Bedrock AgentCore Console
2. Go to "Runtimes" in the left navigation
3. Find your runtime (name starts with BasicAgentDemo_)
4. Click on the runtime name
5. Click "Test" button
6. Enter test payload:

   {
     "prompt": "Hello, how are you?"
   }
   

7. Click "Invoke"

Sample Queries

Try these queries to test your basic agent:

1. Simple Greeting:

   {"prompt": "Hello, how are you?"}
   

2. Question Answering:

   {"prompt": "What is the capital of France?"}
   

3. Creative Writing:

   {"prompt": "Write a short poem about clouds"}
   

4. Problem Solving:

   {"prompt": "How do I bake a chocolate cake?"}
   

Cleanup

Using CDK (Recommended)

cdk destroy

Using AWS CLI

aws cloudformation delete-stack \
  --stack-name BasicAgentDemo \
  --region us-east-1

# Wait for deletion to complete
aws cloudformation wait stack-delete-complete \
  --stack-name BasicAgentDemo \
  --region us-east-1

Using AWS Console

1. Navigate to CloudFormation Console
2. Select the BasicAgentDemo stack
3. Click "Delete"
4. Confirm deletion

Cost Estimate

Monthly Cost Breakdown (us-east-1)

Service	Usage	Monthly Cost
AgentCore Runtime	1 runtime, minimal usage	~$5-10
ECR Repository	1 repository, <1GB storage	~$0.10
CodeBuild	Occasional builds	~$1-2
Lambda	Custom resource executions	~$0.01
CloudWatch Logs	Agent logs	~$0.50
Bedrock Model Usage	Pay per token	Variable*

Estimated Total: ~$7-13/month (excluding Bedrock model usage)

*Bedrock costs depend on your usage patterns and chosen models. See Bedrock Pricing for details.

Cost Optimization Tips

• Delete when not in use: Use cdk destroy to remove all resources
• Monitor usage: Set up CloudWatch billing alarms
• Choose efficient models: Select appropriate Bedrock models for your use case

Troubleshooting

CDK Bootstrap Required

If you see bootstrap errors:

cdk bootstrap aws://ACCOUNT-NUMBER/REGION

Permission Issues

Ensure your IAM user/role has:

• CDKToolkit permissions or equivalent
• Permissions to create all resources in the stack
• iam:PassRole for service roles

Python Dependencies

Install dependencies in the project directory:

pip install -r requirements.txt

Build Failures

Check CodeBuild logs in the AWS Console:

1. Go to CodeBuild console
2. Find the build project (name contains "basic-agent-build")
3. Check build history and logs

Runtime Issues

If the runtime fails to start:

1. Check CloudWatch logs for the runtime
2. Verify the Docker image was built successfully
3. Ensure IAM permissions are correct

🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.