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Terraform Infrastructure as Code Review Checklist

Review Terraform or OpenTofu changes with a security, reliability, and cost lens before infrastructure hits production.

Prompt Template

You are a senior platform engineer reviewing an infrastructure-as-code pull request. Audit the following Terraform or OpenTofu changes before they are applied.

**Cloud provider:** [AWS / GCP / Azure / multi-cloud]
**Environment:** [dev / staging / production]
**Purpose of this change:** [what infra is being added or modified]
**Constraints:** [security policies, budget limits, compliance, uptime goals]

**Terraform/OpenTofu code:**
```hcl
[paste .tf files or plan output here]
```

**Current pain points or worries:** [e.g., drift, over-permissioned IAM, high cost, risky destroy actions]

Please review for:
1. **Security** — IAM least privilege, secret handling, network exposure, encryption, public access
2. **Reliability** — deletion risk, missing backups, single points of failure, rollback safety
3. **Cost** — expensive defaults, always-on resources, unnecessary overprovisioning
4. **Maintainability** — naming, module structure, variables, tagging, reuse, documentation
5. **Operational readiness** — monitoring, alerts, logs, lifecycle policies, runbooks
6. **Plan safety** — highlight any `destroy`, replacement, or state risk

Format the output as:
- 🔴 Critical risk
- 🟡 Recommended improvement
- 🟢 Good practice already present

For each issue include the affected resource, why it matters, and a concrete code-level fix. End with a merge recommendation: Safe to apply / Apply after fixes / Do not apply.

Example Output

Terraform Review Summary

🔴 Critical risk

**Resource:** `aws_s3_bucket.customer_exports`

Bucket versioning is disabled and the bucket stores customer export files. A mistaken overwrite or delete would be irreversible.

Fix:

resource "aws_s3_bucket_versioning" "customer_exports" {

bucket = aws_s3_bucket.customer_exports.id

versioning_configuration {

status = "Enabled"

}

}

🟡 Recommended improvement

**Resource:** `aws_instance.app`

The instance type is `m6i.2xlarge` in staging with no autoscaling attached. This likely overprovisions compute and increases monthly cost.

**Suggestion:** right-size to `m6i.large` for staging or move to an autoscaling group with min/max bounds.

🟢 Good practice already present

`kms_key_id` is explicitly set on the RDS instance and tags are consistent across resources.

Merge recommendation

**Apply after fixes**. The plan is mostly solid, but versioning and staging overprovisioning should be addressed first.

Tips for Best Results

  • 💡Paste the Terraform plan output along with the code, the plan often reveals replacements you might miss in the source
  • 💡Mention whether the change is for production, review standards should be stricter for prod than for dev sandboxes
  • 💡Ask the AI to produce a rollback checklist if the plan includes resource replacement or deletion
  • 💡Include your tagging and IAM conventions so the review catches policy violations, not just syntax issues

Try it with

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