terraform-module-library Skill for Claude Code: Reusable Terraform Modules

• A folder tree of modules by cloud

  Lays out terraform-modules/ with aws, azure, gcp and oci folders and modules such as vpc, eks, rds, s3, vnet, aks, gke, cloud-sql, vcn and oke.

  Write · Module structure

• The files every module has

  main.tf, variables.tf, outputs.tf, versions.tf, README.md, an examples/complete folder and a Terratest file in tests/.

  Write · Standard module pattern

• Full main.tf, variables.tf and outputs.tf for a VPC

  A VPC with private subnets and an optional internet gateway, a CIDR validation block and outputs for VPC ID, subnet IDs and CIDR.

  AWS VPC module example

• Ten rules for modules

  Semantic versioning, documented variables, examples, validation blocks, outputs, pinned provider versions, locals, count or for_each, Terratest and consistent tags.

  Best practices

• Wire a VPC module into an RDS module

  Shows module blocks that pass module.vpc outputs to a PostgreSQL RDS module.

  Module composition

• A Go test that applies and destroys the example

  Runs terraform.InitAndApply on examples/complete, checks the vpc_id output and destroys the resources afterwards.

  Runs code · Testing with Terratest

• AWS patterns

  VPC, EKS, RDS, S3, ALB, Lambda and security group modules, plus best practices.

  references/aws-modules.md

• OCI patterns

  VCN, OKE, Autonomous Database, Object Storage and load balancer modules, plus best practices.

  references/oci-modules.md

Watch out for

• The test example creates and destroys real cloud resources

  The Testing section calls terraform.InitAndApply and a deferred Destroy. Run tests in a sandbox cloud account with limited permissions.

• Claude writes many files under your project

  The standard pattern adds main.tf, variables.tf, outputs.tf, examples and tests per module. Review the diff and run terraform plan before any apply.