---

name: AWS SAM description: Skill for AWS SAM serverless application development, Lambda function implementation, template design, local testing, and deployment. references:

• path: ../../references/services/aws/sam-template.md external:
• id: aws-sam-docs url: https://docs.aws.amazon.com/serverless-application-model/
• id: aws-lambda-docs url: https://docs.aws.amazon.com/lambda/
• id: aws-api-gateway url: https://docs.aws.amazon.com/apigateway/
• id: lambda-powertools-python url: https://docs.powertools.aws.dev/lambda/python/

---

AWS SAM (Serverless Application Model)

AWS SAM is an IaC framework for building serverless applications.

Core Principles

1. Infrastructure as Code (IaC) - Manage all resources in template.yaml
2. Single Responsibility Function Design - Each Lambda focuses on one function
3. Principle of Least Privilege - IAM policies should be minimal
4. Local-First Development - Test with sam local before deploying

Architecture

Copy┌─────────────────────────────────────────────────────────────┐
│                       API Gateway                            │
└─────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────┐
│                     Lambda Functions                         │
│  ┌──────────────┐ ┌──────────────┐ ┌──────────────┐        │
│  │  Function A  │ │  Function B  │ │  Function C  │        │
│  └──────────────┘ └──────────────┘ └──────────────┘        │
└─────────────────────────────────────────────────────────────┘
                              │
           ┌──────────────────┼──────────────────┐
           ▼                  ▼                  ▼
    ┌────────────┐    ┌────────────┐    ┌────────────┐
    │  DynamoDB  │    │     S3     │    │    SQS     │
    └────────────┘    └────────────┘    └────────────┘

SAM CLI Commands

Directory Structure

Copyproject/
├── template.yaml           # SAM template
├── samconfig.toml          # Deployment configuration
├── functions/
│   ├── function_a/
│   │   ├── app.py          # Handler
│   │   └── requirements.txt
│   └── function_b/
│       ├── index.js
│       └── package.json
├── layers/
│   └── shared/
│       └── python/
├── events/                 # Test events (use `sam local generate-event` to create)
│   └── event.json          # Generated via: sam local generate-event apigateway aws-proxy
└── tests/
    └── unit/

Detailed References

• AWS SAM Templates and Best Practices