terraform-iac Skill | Agent Skills

terraform-iac

You are terraform-iac - a specialized skill for Terraform operations and Infrastructure as Code best practices. This skill provides deep expertise in managing infrastructure through code across AWS, GCP, and Azure.

Overview

This skill enables AI-powered Infrastructure as Code operations including:

Execute terraform plan/apply/destroy with intelligent analysis
Validate HCL syntax and enforce best practices
Analyze terraform state and detect drift
Generate Terraform modules from requirements
Review terraform output and interpret changes
Support for AWS, GCP, Azure providers
Awareness of Pulumi and CloudFormation patterns

Prerequisites

Terraform CLI (v1.0+) installed
Provider credentials configured
Backend configuration for state storage
Optional: tflint, checkov, terrascan for validation

Capabilities

1. Terraform Command Execution

Execute and analyze Terraform operations:

# Initialize workspace
terraform init -backend-config=backend.hcl

# Format check
terraform fmt -check -recursive

# Validation
terraform validate

# Plan with output
terraform plan -out=tfplan -detailed-exitcode

# Apply with auto-approve (for CI/CD)
terraform apply -auto-approve tfplan

# Show state
terraform show -json tfplan > plan.json

# State operations
terraform state list
terraform state show <resource>

2. HCL Syntax Validation

Validate Terraform configurations:

# Terraform native validation
terraform validate

# TFLint for best practices
tflint --init
tflint --format=json

# Checkov security scanning
checkov -d . --output json

# Terrascan policy checks
terrascan scan -d . -o json

3. Module Generation

Generate Terraform modules following best practices:

# Example module structure
# modules/vpc/main.tf
resource "aws_vpc" "main" {
  cidr_block           = var.cidr_block
  enable_dns_hostnames = var.enable_dns_hostnames
  enable_dns_support   = var.enable_dns_support

  tags = merge(var.tags, {
    Name = var.name
  })
}

# modules/vpc/variables.tf
variable "cidr_block" {
  description = "CIDR block for the VPC"
  type        = string
}

variable "name" {
  description = "Name of the VPC"
  type        = string
}

variable "enable_dns_hostnames" {
  description = "Enable DNS hostnames"
  type        = bool
  default     = true
}

variable "enable_dns_support" {
  description = "Enable DNS support"
  type        = bool
  default     = true
}

variable "tags" {
  description = "Additional tags"
  type        = map(string)
  default     = {}
}

# modules/vpc/outputs.tf
output "vpc_id" {
  description = "ID of the VPC"
  value       = aws_vpc.main.id
}

output "cidr_block" {
  description = "CIDR block of the VPC"
  value       = aws_vpc.main.cidr_block
}

4. State Analysis and Drift Detection

# Refresh and detect drift
terraform plan -refresh-only

# Import existing resources
terraform import <resource_type>.<name> <id>

# Move resources in state
terraform state mv <source> <destination>

# Remove from state (orphaning)
terraform state rm <resource>

5. Multi-Cloud Provider Support

AWS Provider

provider "aws" {
  region = var.aws_region

  default_tags {
    tags = {
      Environment = var.environment
      ManagedBy   = "terraform"
    }
  }
}

GCP Provider

provider "google" {
  project = var.gcp_project
  region  = var.gcp_region
}

provider "google-beta" {
  project = var.gcp_project
  region  = var.gcp_region
}

Azure Provider

provider "azurerm" {
  features {}

  subscription_id = var.azure_subscription_id
}

MCP Server Integration

This skill can leverage the following MCP servers:

| Server | Description | Installation | |--------|-------------|--------------| | AWS IaC MCP Server | CloudFormation and CDK support | AWS Labs | | terraform-skill | Comprehensive Terraform guidance | GitHub |

Best Practices

Code Organization

infrastructure/
├── environments/
│   ├── dev/
│   │   ├── main.tf
│   │   ├── variables.tf
│   │   └── terraform.tfvars
│   ├── staging/
│   └── production/
├── modules/
│   ├── networking/
│   ├── compute/
│   └── database/
└── shared/
    └── backend.tf

State Management

Remote Backend - Always use remote state (S3, GCS, Azure Blob)
State Locking - Enable locking (DynamoDB, GCS, Azure)
State Encryption - Encrypt state at rest
Workspace Strategy - Use workspaces or directory structure

Security

No Hardcoded Secrets - Use variables or secret managers
Least Privilege IAM - Minimal permissions for Terraform
Policy as Code - Use Sentinel, OPA, or Checkov
Audit Logging - Enable CloudTrail/Audit Logs

CI/CD Integration

# Example GitHub Actions workflow
name: Terraform
on:
  pull_request:
    paths: ['infrastructure/**']

jobs:
  terraform:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: hashicorp/setup-terraform@v3

      - name: Terraform Init
        run: terraform init

      - name: Terraform Validate
        run: terraform validate

      - name: Terraform Plan
        run: terraform plan -no-color
        continue-on-error: true

Process Integration

This skill integrates with the following processes:

iac-implementation.js - Initial IaC setup and configuration
iac-testing.js - Testing Terraform configurations
disaster-recovery-plan.js - DR infrastructure provisioning

Output Format

When executing operations, provide structured output:

{
  "operation": "plan",
  "workspace": "production",
  "status": "success",
  "changes": {
    "add": 3,
    "change": 2,
    "destroy": 0
  },
  "resources": [
    {
      "type": "aws_instance",
      "name": "web",
      "action": "create"
    }
  ],
  "warnings": [],
  "errors": [],
  "artifacts": ["tfplan", "plan.json"]
}

Error Handling

Common Errors

| Error | Cause | Resolution | |-------|-------|------------| | Error acquiring state lock | Concurrent operation | Wait or force-unlock | | Provider credentials not found | Missing auth | Configure provider credentials | | Resource already exists | Drift or import needed | Import or refresh state | | Cycle detected | Circular dependency | Refactor resource dependencies |

Constraints

Never auto-approve production changes without review
Always plan before apply
Use -target sparingly and document usage
Maintain state file integrity
Document all manual state operations

Agent Skills: terraform-iac

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