aws-cloudformation-elasticache

# AWS CloudFormation ElastiCache ## Overview Use this skill to model ElastiCache infrastructure with CloudFormation without turning `SKILL.md` into a full service manual. Focus on the delivery decisions that matter most: - choosing the right cache topology - placing the cache safely inside a VPC - configuring availability, encryption, and exports for downstream stacks Use the bundled `references/` documents for larger production templates and service-specific detail. ## When to Use Use this skill when: - creating a Redis or Memcached cache tier with CloudFormation - deciding between `AWS::ElastiCache::CacheCluster` and `AWS::ElastiCache::ReplicationGroup` - configuring subnet groups, parameter groups, and security groups for application access - adding snapshots, maintenance windows, encryption, and Multi-AZ behavior - exporting cache endpoints to application or platform stacks - reviewing cache changes for replacement risk, downtime, or operational cost Typical trigger phrases include `cloudformation elasticache`, `redis replication group`, `memcached cluster`, `cache subnet group`, and `export redis endpoint`. ## Instructions ### 1. Choose the cache topology first Use: - `ReplicationGroup` for production Redis-style deployments that need failover, replicas, or sharding - `CacheCluster` for Memcached or simple single-node cache scenarios Do not start with resource YAML before deciding whether the application needs durability, read replicas, cluster mode, or just a...