Implements AWS Lambda functions and event-driven serverless architectures with best practices.
npx skills add https://github.com/Dazlarus/karl-code --skill serverless-dazlarus
Please help me install this Agent Skill. Skill: serverless Source: https://github.com/Dazlarus/karl-code/tree/main/.agents/skills/serverless Command: npx skills add https://github.com/Dazlarus/karl-code --skill serverless-dazlarus
High-intent search queries and answers about installing and using this skill.
Define a lambda_handler function accepting event and context parameters, validate input, process the event, and return a response dict with statusCode and body. Keep the function idempotent and stateless, and read configuration from environment variables.
Iterate over event['Records'], parse each record's body as JSON, and process messages individually with per-record error handling. Return failed message IDs so SQS can retry only the failures instead of the entire batch.
Include Access-Control-Allow-Origin, Access-Control-Allow-Headers, and Access-Control-Allow-Methods headers in every response. Also handle the OPTIONS preflight request by returning a 200 response with the same CORS headers.
Avoid Lambda for long-running processes, constant high-volume workloads, and simple API endpoints where containers or EC2 are more cost-effective. Lambda suits event-driven, intermittent workloads with variable traffic.
Catch ClientError exceptions and inspect the error code. Return 429 for ProvisionedThroughputExceededException, 404 for ResourceNotFoundException, and 500 for unexpected errors, with logging at appropriate levels.
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