Lambda

This covers the essentials for working with AWS Lambda: creating functions, configuring triggers from S3/SQS/Kinesis, managing layers, and debugging invocations. The cold start optimization section is practical, especially the tip about initializing connections outside the handler to reuse them across invocations. Good reference for event source mappings and the differences between synchronous, asynchronous, and poll-based invocations. The troubleshooting section addresses real pain points like VPC latency and memory errors. One thing to note is that Lambda's pricing model really does favor smaller, focused functions over monoliths, so the guidance on right-sizing memory and timeout settings can directly impact your AWS bill.

skills.sh installs: 178
GitHub stars: 1.2K
last updated: Aug 21, 2026

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Install

$ npx -y skills add itsmostafa/aws-agent-skills --skill lambda --agent claude-code

Installs into .claude/skills of the current project.

Files

AWS Lambda

AWS Lambda runs code without provisioning servers. You pay only for compute time consumed. Lambda automatically scales from a few requests per day to thousands per second.

Core Concepts
Common Patterns
CLI Reference
Best Practices
Troubleshooting
References

Core Concepts

Function

Your code packaged with configuration. Includes runtime, handler, memory, timeout, and IAM role.

Invocation Types

Type	Description	Use Case
Synchronous	Caller waits for response	API Gateway, direct invoke
Asynchronous	Fire and forget	S3, SNS, EventBridge
Poll-based	Lambda polls source	SQS, Kinesis, DynamoDB Streams