MCPInstall

terraform-style-check

Generate Terraform HCL code following HashiCorp's official style conventions and best practices. Use when writing, reviewing, or generating Terraform configurations.

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/warpdotdev/oz-skills --skill terraform-style-check
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads terraform-style-check automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Terraform Style Guide

Generate and maintain Terraform code following HashiCorp's official style conventions and best practices.

Reference: HashiCorp Terraform Style Guide

Code Generation Strategy

When generating Terraform code:

  1. Start with provider configuration and version constraints
  2. Create data sources before dependent resources
  3. Build resources in dependency order
  4. Add outputs for key resource attributes
  5. Use variables for all configurable values

File Organization

FilePurpose
terraform.tfTerraform and provider version requirements
providers.tfProvider configurations
main.tfPrimary resources and data sources
variables.tfInput variable declarations (alphabetical)
outputs.tfOutput value declarations (alphabetical)
locals.tfLocal value declarations

Example Structure

# terraform.tf
terraform {
  required_version = ">= 1.7"

  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.0"
    }
  }
}

# variables.tf
variable "environment" {
  description = "Target deployment environment"
  type        = string

  validation {
    condition     = contains(["dev", "staging", "prod"], var.environment)
    error_message = "Environment must be dev, staging, or prod."
  }
}

# locals.tf
locals {
  common_tags = {
    Environment = var.environment
    ManagedBy   = "Terraform"
  }
}

# main.tf
resource "aws_vpc" "main" {
  cidr_block           = var.vpc_cidr
  enable_dns_hostnames = true

  tags = merge(local.common_tags, {
    Name = "${var.project_name}-${var.environment}-vpc"
  })
}

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

Code Formatting

Indentation and Alignment

  • Use two spaces per nesting level (no tabs)
  • Align equals signs for consecutive arguments
resource "aws_instance" "web" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"
  subnet_id     = "subnet-12345678"

  tags = {
    Name        = "web-server"
    Environment = "production"
  }
}

Block Organization

Arguments precede blocks, with meta-arguments first:

resource "aws_instance" "example" {
  # Meta-arguments
  count = 3

  # Arguments
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"

  # Blocks
  root_block_device {
    volume_size = 20
  }

  # Lifecycle last
  lifecycle {
    create_before_destroy = true
  }
}

Naming Conventions

  • Use lowercase with underscores for all names
  • Use descriptive nouns excluding the resource type
  • Be specific and meaningful
# Bad
resource "aws_instance" "webAPI-aws-instance" {}
variable "name" {}

# Good
resource "aws_instance" "web_api" {}
variable "application_name" {}

Variables

Every variable must include type and description:

variable "instance_type" {
  description = "EC2 instance type for the web server"
  type        = string
  default     = "t2.micro"

  validation {
    condition     = contains(["t2.micro", "t2.small", "t2.medium"], var.instance_type)
    error_message = "Instance type must be t2.micro, t2.small, or t2.medium."
  }
}

variable "database_password" {
  description = "Password for the database admin user"
  type        = string
  sensitive   = true
}

Outputs

Every output must include description:

output "instance_id" {
  description = "ID of the EC2 instance"
  value       = aws_instance.web.id
}

output "database_password" {
  description = "Database administrator password"
  value       = aws_db_instance.main.password
  sensitive   = true
}

Dynamic Resource Creation

Prefer for_each over count

# Bad - count for multiple resources
resource "aws_instance" "web" {
  count = var.instance_count
  tags  = { Name = "web-${count.index}" }
}

# Good - for_each with named instances
variable "instance_names" {
  type    = set(string)
  default = ["web-1", "web-2", "web-3"]
}

resource "aws_instance" "web" {
  for_each = var.instance_names
  tags     = { Name = each.key }
}

count for Conditional Creation

resource "aws_cloudwatch_metric_alarm" "cpu" {
  count = var.enable_monitoring ? 1 : 0

  alarm_name = "high-cpu-usage"
  threshold  = 80
}

Security Best Practices

When generating code, apply security hardening:

  • Enable encryption at rest by default
  • Configure private networking where applicable
  • Apply principle of least privilege for security groups
  • Enable logging and monitoring
  • Never hardcode credentials or secrets
  • Mark sensitive outputs with sensitive = true

Example: Secure S3 Bucket

resource "aws_s3_bucket" "data" {
  bucket = "${var.project}-${var.environment}-data"
  tags   = local.common_tags
}

resource "aws_s3_bucket_versioning" "data" {
  bucket = aws_s3_bucket.data.id

  versioning_configuration {
    status = "Enabled"
  }
}

resource "aws_s3_bucket_server_side_encryption_configuration" "data" {
  bucket = aws_s3_bucket.data.id

  rule {
    apply_server_side_encryption_by_default {
      sse_algorithm     = "aws:kms"
      kms_master_key_id = aws_kms_key.s3.arn
    }
  }
}

resource "aws_s3_bucket_public_access_block" "data" {
  bucket = aws_s3_bucket.data.id

  block_public_acls       = true
  block_public_policy     = true
  ignore_public_acls      = true
  restrict_public_buckets = true
}

Version Pinning

terraform {
  required_version = ">= 1.7"

  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.0"  # Allow minor updates
    }
  }
}

Version constraint operators:

  • = 1.0.0 - Exact version
  • >= 1.0.0 - Greater than or equal
  • ~> 1.0 - Allow rightmost component to increment
  • >= 1.0, < 2.0 - Version range

Provider Configuration

provider "aws" {
  region = "us-west-2"

  default_tags {
    tags = {
      ManagedBy = "Terraform"
      Project   = var.project_name
    }
  }
}

# Aliased provider for multi-region
provider "aws" {
  alias  = "east"
  region = "us-east-1"
}

Version Control

Never commit:

  • terraform.tfstate, terraform.tfstate.backup
  • .terraform/ directory
  • *.tfplan
  • .tfvars files with sensitive data

Always commit:

  • All .tf configuration files
  • .terraform.lock.hcl (dependency lock file)

Validation Tools

Run before committing:

terraform fmt -recursive
terraform validate

Additional tools:

  • tflint - Linting and best practices
  • checkov / tfsec - Security scanning

Code Review Checklist

  • Code formatted with terraform fmt
  • Configuration validated with terraform validate
  • Files organized according to standard structure
  • All variables have type and description
  • All outputs have descriptions
  • Resource names use descriptive nouns with underscores
  • Version constraints pinned explicitly
  • Sensitive values marked with sensitive = true
  • No hardcoded credentials or secrets
  • Security best practices applied

Based on: HashiCorp Terraform Style Guide

FAQ

What does the terraform-style-check skill do?

Generate Terraform HCL code following HashiCorp's official style conventions and best practices. Use when writing, reviewing, or generating Terraform configurations.

How do I install terraform-style-check?

Run npx skills add https://github.com/warpdotdev/oz-skills --skill terraform-style-check in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/terraform-style-check/ (personal) or .claude/skills/terraform-style-check/ (project).

Which AI agents can use terraform-style-check?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is terraform-style-check safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains terraform-style-check?

It is published by warpdotdev in warpdotdev/oz-skills. It has 139 recorded installs.

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