Use AWS Parameter Store Public Params to Auto-Resolve Lambda Layer ARNs

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Developers who hardcode AWS Lambda layer ARNs risk silently running outdated versions as AWS releases updates without notice. AWS Systems Manager Parameter Store offers public parameters — prefixed with aws/service/ — that always resolve to the latest ARN at deploy time. For the AppConfig Agent Lambda extension, dedicated paths exist for both x86_64 and ARM64 architectures, queryable via a simple AWS CLI command or infrastructure template. Only the ssm:GetParameter IAM permission is needed, and the parameters are readable from any AWS account at no extra cost. This approach eliminates manual ARN tracking across teams and regions, reducing operational drift and maintenance overhead.

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