AWS Lambda durable functions

Build resilient multi-step applications and AI workflows that can execute for up to 1 year while maintaining reliable progress despite interruptions.

Onboarding

Step 1: Validate Prerequisites

Before using AWS Lambda durable functions, verify:

1. AWS CLI is installed (2.33.22 or higher) and configured:

   aws --version
   aws sts get-caller-identity
   

2. Runtime environment is ready:

   • For TypeScript/JavaScript: Node.js 22+ (node --version)
   • For Python: Python 3.11+ (python --version. Note that currently only Lambda runtime environments 3.13+ come with the Durable Execution SDK pre-installed. 3.11 is the min supported Python version by the Durable SDK itself, however, you could use OCI to bring your own container image with your own Python runtime + Durable SDK.)

3. Deployment capability exists (one of):

   • AWS SAM CLI (sam --version) 1.153.1 or higher
   • AWS CDK (cdk --version) v2.237.1 or higher
   • Direct Lambda deployment access

Step 2: Select language and IaC framework

Language Selection

Default: TypeScript

Override syntax:

• "use Python" → Generate Python code
• "use JavaScript" → Generate JavaScript code

When not specified, ALWAYS use TypeScript

IaC framework selection

Default: CDK

Override syntax:

• "use CloudFormation" → Generate YAML templates
• "use SAM" → Generate YAML templates

When not specified, ALWAYS use CDK

Error Scenarios

Unsupported Language

• List detected language
• State: "Durable Execution SDK is not yet available for [framework]"
• Suggest supported languages as alternatives

Unsupported IaC Framework

• List detected framework
• State: "[framework] might not support Lambda durable functions yet"
• Suggest supported frameworks as alternatives

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