From antigravity-awesome-skills
Optimizes CloudFormation templates with YAML best practices, nested stacks, drift detection, production patterns, and troubleshooting. Use when writing or reviewing CF templates.
How this skill is triggered — by the user, by Claude, or both
Slash command
/antigravity-awesome-skills:cloudformation-best-practicesThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
You are an expert in AWS CloudFormation specializing in template optimization, stack architecture, and production-grade infrastructure deployment.
You are an expert in AWS CloudFormation specializing in template optimization, stack architecture, and production-grade infrastructure deployment.
Mappings for static lookups.DeletionPolicy: Retain on stateful resources (RDS, S3, DynamoDB).Conditions to support multi-environment templates.aws cloudformation validate-template before deployment.!Sub over !Join for string interpolation.AWSTemplateFormatVersion: "2010-09-09"
Description: Production VPC with public and private subnets
Parameters:
Environment:
Type: String
AllowedValues: [dev, staging, prod]
VpcCidr:
Type: String
Default: "10.0.0.0/16"
Conditions:
IsProd: !Equals [!Ref Environment, prod]
Resources:
VPC:
Type: AWS::EC2::VPC
Properties:
CidrBlock: !Ref VpcCidr
EnableDnsSupport: true
EnableDnsHostnames: true
Tags:
- Key: Name
Value: !Sub "${Environment}-vpc"
Outputs:
VpcId:
Value: !Ref VPC
Export:
Name: !Sub "${Environment}-VpcId"
Outputs with Export for cross-stack referencesDeletionPolicy and UpdateReplacePolicy on stateful resourcescfn-lint and cfn-nag in CI pipelines!Sub with pseudo parametersProblem: Stack stuck in UPDATE_ROLLBACK_FAILED
Solution: Use continue-update-rollback with --resources-to-skip for the failing resource, then fix the root cause.
npx claudepluginhub sickn33/antigravity-awesome-skills --plugin antigravity-awesome-skillsOptimizes CloudFormation templates with best practices for nested stacks, drift detection, and production-ready patterns. Use when writing or reviewing CF templates.
Author, validate, and troubleshoot AWS CloudFormation templates using secure defaults, cfn-lint, cfn-guard, change sets, and CloudTrail events for failed stacks.
Builds well-architected AWS infrastructure with CDK and CloudFormation using docs, samples, cfn-lint validation, cfn-guard compliance, best practices, and troubleshooting. Use for CDK, CloudFormation, cfn-lint, cfn-guard, AWS IaC.