[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"skill-hashicorp-refactor-module":3,"mdc--n3jdta-key":34,"related-repo-hashicorp-refactor-module":4466,"related-org-hashicorp-refactor-module":4560},{"slug":4,"name":4,"fn":5,"description":6,"org":7,"tags":11,"stars":22,"repoUrl":23,"updatedAt":24,"license":25,"forks":26,"topics":27,"repo":29,"sourceUrl":32,"mdContent":33},"refactor-module","refactor Terraform configurations into reusable modules","Transform monolithic Terraform configurations into reusable, maintainable modules following HashiCorp's module design principles and community best practices.",{"slug":8,"name":9,"logoUrl":10,"githubOrg":8},"hashicorp","HashiCorp","https:\u002F\u002Fpexgzepcugksgbtrxkhf.supabase.co\u002Fstorage\u002Fv1\u002Fobject\u002Fpublic\u002Forg-logos\u002Fhashicorp.png",[12,16,19],{"name":13,"slug":14,"type":15},"Architecture","architecture","tag",{"name":17,"slug":18,"type":15},"Terraform","terraform",{"name":20,"slug":21,"type":15},"Infrastructure as Code","infrastructure-as-code",728,"https:\u002F\u002Fgithub.com\u002Fhashicorp\u002Fagent-skills","2026-04-06T18:25:20.953737",null,104,[28],"doormat-managed",{"repoUrl":23,"stars":22,"forks":26,"topics":30,"description":31},[28],"A collection of Agent skills and Claude Code plugins for HashiCorp products.","https:\u002F\u002Fgithub.com\u002Fhashicorp\u002Fagent-skills\u002Ftree\u002FHEAD\u002Fterraform\u002Fmodule-generation\u002Fskills\u002Frefactor-module","---\nname: refactor-module\ndescription: Transform monolithic Terraform configurations into reusable, maintainable modules following HashiCorp's module design principles and community best practices.\nmetadata:\n copyright: Copyright IBM Corp. 2026\n version: \"0.0.1\"\n---\n\n# Skill: Refactor Module\n\n## Overview\nThis skill guides AI agents in transforming monolithic Terraform configurations into reusable, maintainable modules following HashiCorp's module design principles and community best practices.\n\n## Capability Statement\nThe agent will analyze existing Terraform code and systematically refactor it into well-structured modules with:\n- Clear interface contracts (variables and outputs)\n- Proper encapsulation and abstraction\n- Versioning and documentation\n- Testing frameworks\n- Migration path for existing state\n\n## Prerequisites\n- Existing Terraform configuration to refactor\n- Understanding of resource dependencies\n- Access to current state file (for migration planning)\n- Knowledge of module registry patterns\n\n## Input Parameters\n\n| Parameter | Type | Required | Description |\n|-----------|------|----------|-------------|\n| `source_directory` | string | Yes | Path to existing Terraform configuration |\n| `module_name` | string | Yes | Name for the new module |\n| `abstraction_level` | string | No | \"simple\", \"intermediate\", \"advanced\" (default: intermediate) |\n| `preserve_state` | boolean | Yes | Whether to maintain state compatibility |\n| `target_registry` | string | No | Target module registry (local, private, public) |\n\n## Execution Steps\n\n### 1. Analysis Phase\n```markdown\n**Identify Refactoring Candidates**\n- Group resources by logical function\n- Identify repeated patterns\n- Map resource dependencies\n- Detect configuration coupling\n- Analyze variable usage patterns\n\n**Complexity Assessment**\n- Count resource relationships\n- Measure variable propagation depth\n- Identify cross-resource references\n- Evaluate state migration complexity\n```\n\n### 2. Module Design\n\n#### Interface Design\n```hcl\n# Define clear input contract\nvariable \"network_config\" {\n description = \"Network configuration parameters\"\n type = object({\n cidr_block = string\n availability_zones = list(string)\n enable_nat = bool\n })\n\n validation {\n condition = can(cidrhost(var.network_config.cidr_block, 0))\n error_message = \"CIDR block must be valid IPv4 CIDR.\"\n }\n}\n\n# Define output contract\noutput \"vpc_id\" {\n description = \"ID of the created VPC\"\n value = aws_vpc.main.id\n}\n\noutput \"private_subnet_ids\" {\n description = \"List of private subnet IDs\"\n value = { for k, v in aws_subnet.private : k => v.id }\n}\n```\n\n#### Encapsulation Strategy\n```markdown\n**What to Include in Module:**\n- Tightly coupled resources (VPC + subnets)\n- Resources with shared lifecycle\n- Configuration with clear boundaries\n\n**What to Keep Separate:**\n- Cross-cutting concerns (monitoring, tagging)\n- Resources with different lifecycles\n- Provider-specific configurations\n```\n\n### 3. Code Transformation\n\n#### Before: Monolithic Configuration\n```hcl\n# main.tf (monolithic)\nresource \"aws_vpc\" \"main\" {\n cidr_block = \"10.0.0.0\u002F16\"\n enable_dns_hostnames = true\n\n tags = {\n Name = \"production-vpc\"\n Environment = \"prod\"\n }\n}\n\nresource \"aws_subnet\" \"public_1\" {\n vpc_id = aws_vpc.main.id\n cidr_block = \"10.0.1.0\u002F24\"\n availability_zone = \"us-east-1a\"\n\n tags = {\n Name = \"public-subnet-1\"\n Type = \"public\"\n }\n}\n\nresource \"aws_subnet\" \"public_2\" {\n vpc_id = aws_vpc.main.id\n cidr_block = \"10.0.2.0\u002F24\"\n availability_zone = \"us-east-1b\"\n\n tags = {\n Name = \"public-subnet-2\"\n Type = \"public\"\n }\n}\n\nresource \"aws_internet_gateway\" \"main\" {\n vpc_id = aws_vpc.main.id\n\n tags = {\n Name = \"production-igw\"\n }\n}\n\n# ... more repetitive subnet and routing resources\n```\n\n#### After: Modular Structure\n```hcl\n# modules\u002Fvpc\u002Fmain.tf\nlocals {\n subnet_count = length(var.availability_zones)\n}\n\nresource \"aws_vpc\" \"main\" {\n cidr_block = var.cidr_block\n enable_dns_hostnames = var.enable_dns_hostnames\n enable_dns_support = var.enable_dns_support\n\n tags = merge(\n var.tags,\n {\n Name = var.name\n }\n )\n}\n\nresource \"aws_subnet\" \"public\" {\n for_each = var.create_public_subnets ? toset(var.availability_zones) : []\n\n vpc_id = aws_vpc.main.id\n cidr_block = cidrsubnet(var.cidr_block, 8, index(var.availability_zones, each.value))\n availability_zone = each.value\n map_public_ip_on_launch = true\n\n tags = merge(\n var.tags,\n {\n Name = \"${var.name}-public-${each.value}\"\n Type = \"public\"\n }\n )\n}\n\nresource \"aws_internet_gateway\" \"main\" {\n count = var.create_public_subnets ? 1 : 0\n vpc_id = aws_vpc.main.id\n\n tags = merge(\n var.tags,\n {\n Name = \"${var.name}-igw\"\n }\n )\n}\n\n# modules\u002Fvpc\u002Fvariables.tf\nvariable \"name\" {\n description = \"Name prefix for all resources\"\n type = string\n}\n\nvariable \"cidr_block\" {\n description = \"CIDR block for the VPC\"\n type = string\n\n validation {\n condition = can(cidrhost(var.cidr_block, 0))\n error_message = \"Must be a valid IPv4 CIDR block.\"\n }\n}\n\nvariable \"availability_zones\" {\n description = \"List of availability zones\"\n type = list(string)\n}\n\nvariable \"create_public_subnets\" {\n description = \"Whether to create public subnets\"\n type = bool\n default = true\n}\n\nvariable \"enable_dns_hostnames\" {\n description = \"Enable DNS hostnames in the VPC\"\n type = bool\n default = true\n}\n\nvariable \"enable_dns_support\" {\n description = \"Enable DNS support in the VPC\"\n type = bool\n default = true\n}\n\nvariable \"tags\" {\n description = \"Tags to apply to all resources\"\n type = map(string)\n default = {}\n}\n\n# modules\u002Fvpc\u002Foutputs.tf\noutput \"vpc_id\" {\n description = \"ID of the VPC\"\n value = aws_vpc.main.id\n}\n\noutput \"vpc_cidr_block\" {\n description = \"CIDR block of the VPC\"\n value = aws_vpc.main.cidr_block\n}\n\noutput \"public_subnet_ids\" {\n description = \"Map of availability zones to public subnet IDs\"\n value = { for k, v in aws_subnet.public : k => v.id }\n}\n\noutput \"internet_gateway_id\" {\n description = \"ID of the internet gateway\"\n value = try(aws_internet_gateway.main[0].id, null)\n}\n\n# Root configuration using module\nmodule \"vpc\" {\n source = \".\u002Fmodules\u002Fvpc\"\n\n name = \"production\"\n cidr_block = \"10.0.0.0\u002F16\"\n availability_zones = [\"us-east-1a\", \"us-east-1b\", \"us-east-1c\"]\n\n tags = {\n Environment = \"production\"\n ManagedBy = \"Terraform\"\n }\n}\n```\n\n### 4. State Migration\n\n#### Generate Migration Plan\n```hcl\n# migration.tf\n# Use moved blocks for state refactoring (Terraform 1.1+)\n\nmoved {\n from = aws_vpc.main\n to = module.vpc.aws_vpc.main\n}\n\nmoved {\n from = aws_subnet.public_1\n to = module.vpc.aws_subnet.public[\"us-east-1a\"]\n}\n\nmoved {\n from = aws_subnet.public_2\n to = module.vpc.aws_subnet.public[\"us-east-1b\"]\n}\n\nmoved {\n from = aws_internet_gateway.main\n to = module.vpc.aws_internet_gateway.main[0]\n}\n```\n\n#### Manual State Migration (Pre-1.1)\n```bash\n# Generate state migration commands\nterraform state mv aws_vpc.main module.vpc.aws_vpc.main\nterraform state mv aws_subnet.public_1 'module.vpc.aws_subnet.public[\"us-east-1a\"]'\nterraform state mv aws_subnet.public_2 'module.vpc.aws_subnet.public[\"us-east-1b\"]'\nterraform state mv aws_internet_gateway.main 'module.vpc.aws_internet_gateway.main[0]'\n```\n\n### 5. Module Documentation\n\n```markdown\n# VPC Module\n\n## Overview\nCreates a VPC with configurable public and private subnets across multiple availability zones.\n\n## Features\n- Multi-AZ subnet deployment\n- Optional NAT gateway configuration\n- VPC Flow Logs integration\n- Customizable CIDR allocation\n\n## Usage\n\n\\`\\`\\`hcl\nmodule \"vpc\" {\n source = \".\u002Fmodules\u002Fvpc\"\n\n name = \"my-vpc\"\n cidr_block = \"10.0.0.0\u002F16\"\n availability_zones = [\"us-east-1a\", \"us-east-1b\"]\n\n create_public_subnets = true\n create_private_subnets = true\n enable_nat_gateway = true\n\n tags = {\n Environment = \"production\"\n }\n}\n\\`\\`\\`\n\n## Requirements\n\n| Name | Version |\n|------|---------|\n| terraform | >= 1.5.0 |\n| aws | ~> 5.0 |\n\n## Inputs\n\n| Name | Description | Type | Default | Required |\n|------|-------------|------|---------|----------|\n| name | Name prefix for resources | `string` | n\u002Fa | yes |\n| cidr_block | VPC CIDR block | `string` | n\u002Fa | yes |\n| availability_zones | List of AZs | `list(string)` | n\u002Fa | yes |\n\n## Outputs\n\n| Name | Description |\n|------|-------------|\n| vpc_id | VPC identifier |\n| public_subnet_ids | Map of public subnet IDs |\n| private_subnet_ids | Map of private subnet IDs |\n\n## Examples\n\nSee [examples\u002F](.\u002Fexamples\u002F) directory for complete usage examples.\n```\n\n### 6. Testing\n\nUse skill terraform-test\n\n**Test File**: A `.tftest.hcl` or `.tftest.json` file containing test configuration and run blocks that validate your Terraform configuration.\n\n**Test Block**: Optional configuration block that defines test-wide settings (available since Terraform 1.6.0).\n\n**Run Block**: Defines a single test scenario with optional variables, provider configurations, and assertions. Each test file requires at least one run block.\n\n**Assert Block**: Contains conditions that must evaluate to true for the test to pass. Failed assertions cause the test to fail.\n\n**Mock Provider**: Simulates provider behavior without creating real infrastructure (available since Terraform 1.7.0).\n\n**Test Modes**: Tests run in apply mode (default, creates real infrastructure) or plan mode (validates logic without creating resources).\n\n#### File Structure\n\nTerraform test files use the `.tftest.hcl` or `.tftest.json` extension and are typically organized in a `tests\u002F` directory. Use clear naming conventions to distinguish between unit tests (plan mode) and integration tests (apply mode):\n\n```\nmy-module\u002F\n├── main.tf\n├── variables.tf\n├── outputs.tf\n└── tests\u002F\n ├── unit_test.tftest.hcl # Unit test (plan mode)\n └── integration_test.tftest.hcl # Integration test (apply mode - creates real resources)\n```\n\n## Refactoring Patterns\n\n### Pattern 1: Resource Grouping\nExtract related resources into cohesive modules:\n- Networking (VPC, Subnets, Route Tables)\n- Compute (ASG, Launch Templates, Load Balancers)\n- Data (RDS, ElastiCache, S3)\n\n### Pattern 2: Configuration Layering\n```hcl\n# Base module with defaults\nmodule \"vpc_base\" {\n source = \".\u002Fmodules\u002Fvpc-base\"\n # Minimal required inputs\n}\n\n# Environment-specific wrapper\nmodule \"vpc_prod\" {\n source = \".\u002Fmodules\u002Fvpc-production\"\n # Inherits from base, adds prod-specific config\n}\n```\n\n### Pattern 3: Composition\n```hcl\n# Small, focused modules\nmodule \"vpc\" {\n source = \".\u002Fmodules\u002Fvpc\"\n}\n\nmodule \"security_groups\" {\n source = \".\u002Fmodules\u002Fsecurity-groups\"\n vpc_id = module.vpc.vpc_id\n}\n\nmodule \"application\" {\n source = \".\u002Fmodules\u002Fapplication\"\n vpc_id = module.vpc.vpc_id\n subnet_ids = module.vpc.private_subnet_ids\n sg_ids = module.security_groups.app_sg_ids\n}\n```\n\n## Common Pitfalls\n\n### 1. Over-Abstraction\n```hcl\n# ❌ Don't create overly generic modules\nvariable \"resources\" {\n type = map(map(any)) # Too flexible, hard to validate\n}\n\n# ✅ Do use specific, typed interfaces\nvariable \"database_config\" {\n type = object({\n engine = string\n instance_class = string\n })\n}\n```\n\n### 2. Tight Coupling\n```hcl\n# ❌ Don't couple modules through direct references\n# module A\noutput \"instance_id\" { value = aws_instance.app.id }\n\n# module B (in same config)\nresource \"aws_eip\" \"app\" {\n instance = module.a.instance_id # Tight coupling\n}\n\n# ✅ Do pass dependencies through root module\nmodule \"compute\" {\n source = \".\u002Fmodules\u002Fcompute\"\n}\n\nresource \"aws_eip\" \"app\" {\n instance = module.compute.instance_id\n}\n```\n\n### 3. State Migration Errors\nAlways test migration in non-production first:\n```bash\n# Create plan to verify no changes after migration\nterraform plan -out=migration.tfplan\n\n# Review carefully\nterraform show migration.tfplan\n\n# Apply only if plan shows no changes\nterraform apply migration.tfplan\n```\n\n## Version Control Strategy\n\n```hcl\n# Use semantic versioning for modules\nmodule \"vpc\" {\n source = \"git::https:\u002F\u002Fgithub.com\u002Forg\u002Fterraform-modules.git\u002F\u002Fvpc?ref=v1.2.0\"\n version = \"~> 1.2\"\n}\n\n# Pin to specific versions in production\n# Use version ranges in development\n```\n\n## Success Criteria\n\n- [ ] Module has single, well-defined responsibility\n- [ ] All variables have descriptions and types\n- [ ] Validation rules prevent invalid configurations\n- [ ] Outputs provide sufficient information for consumers\n- [ ] Documentation includes usage examples\n- [ ] Tests verify module behavior\n- [ ] State migration completed without resource recreation\n- [ ] No plan differences after refactoring\n\n## Related Skills\n- [Terraform code generation](https:\u002F\u002Fraw.githubusercontent.com\u002Fhashicorp\u002Fagent-skills\u002Frefs\u002Fheads\u002Fmain\u002Fterraform\u002Fcode-generation\u002Fskills\u002Fterraform-style-guide\u002FSKILL.md) - Style guide for the new Terraform Module\n- [Azure Verified Modules](https:\u002F\u002Fraw.githubusercontent.com\u002Fhashicorp\u002Fagent-skills\u002Frefs\u002Fheads\u002Fmain\u002Fterraform\u002Fcode-generation\u002Fskills\u002Fazure-verified-modules\u002FSKILL.md) - Recommended module specifications for Azure\n\n## Resources\n- [Terraform Module Development](https:\u002F\u002Fdeveloper.hashicorp.com\u002Fterraform\u002Flanguage\u002Fmodules\u002Fdevelop)\n- [Module Best Practices](https:\u002F\u002Fdeveloper.hashicorp.com\u002Fterraform\u002Fcloud-docs\u002Fregistry\u002Fdesign)\n\n## Revision History\n\n| Version | Date | Changes |\n|---------|------|---------|\n| 1.0.0 | 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Structure",{"type":43,"tag":322,"props":1214,"children":1216},{"className":517,"code":1215,"language":519,"meta":327,"style":327},"# modules\u002Fvpc\u002Fmain.tf\nlocals {\n subnet_count = length(var.availability_zones)\n}\n\nresource \"aws_vpc\" \"main\" {\n cidr_block = var.cidr_block\n enable_dns_hostnames = var.enable_dns_hostnames\n enable_dns_support = var.enable_dns_support\n\n tags = merge(\n var.tags,\n {\n Name = var.name\n }\n )\n}\n\nresource \"aws_subnet\" \"public\" {\n for_each = var.create_public_subnets ? toset(var.availability_zones) : []\n\n vpc_id = aws_vpc.main.id\n cidr_block = cidrsubnet(var.cidr_block, 8, index(var.availability_zones, each.value))\n availability_zone = each.value\n map_public_ip_on_launch = true\n\n tags = merge(\n var.tags,\n {\n Name = \"${var.name}-public-${each.value}\"\n Type = \"public\"\n }\n )\n}\n\nresource \"aws_internet_gateway\" \"main\" {\n count = var.create_public_subnets ? 1 : 0\n vpc_id = aws_vpc.main.id\n\n tags = merge(\n var.tags,\n {\n Name = \"${var.name}-igw\"\n }\n )\n}\n\n# modules\u002Fvpc\u002Fvariables.tf\nvariable \"name\" {\n description = \"Name prefix for all resources\"\n type = string\n}\n\nvariable \"cidr_block\" {\n description = \"CIDR block for the VPC\"\n type = string\n\n validation {\n condition = can(cidrhost(var.cidr_block, 0))\n error_message = \"Must be a valid IPv4 CIDR block.\"\n }\n}\n\nvariable \"availability_zones\" {\n description = \"List of availability zones\"\n type = list(string)\n}\n\nvariable \"create_public_subnets\" {\n description = \"Whether to create public subnets\"\n type = bool\n default = true\n}\n\nvariable \"enable_dns_hostnames\" {\n description = \"Enable DNS hostnames in the VPC\"\n type = bool\n default = true\n}\n\nvariable \"enable_dns_support\" {\n description = \"Enable DNS support in the VPC\"\n type = bool\n default = true\n}\n\nvariable \"tags\" {\n description = \"Tags to apply to all resources\"\n type = map(string)\n default = {}\n}\n\n# 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