Serverless Patterns — Advanced

This skill extends serverless-patterns with idempotency, cost modeling, and observability. Load serverless-patterns first.

When to Activate

• Lambda receives duplicate events and needs idempotency (at-least-once delivery)
• Calculating whether Lambda or containers are more cost-effective at current request volume
• Writing CloudWatch Insights queries for cold start analysis, duration percentiles, or error rates

Idempotency

Lambda can be invoked multiple times for the same event (at-least-once delivery). Always design for idempotency.

import { makeHandlerIdempotent } from '@aws-lambda-powertools/idempotency';
import { DynamoDBPersistenceLayer } from '@aws-lambda-powertools/idempotency/dynamodb';