Terragrunt Validator

What it does

The terragrunt-validator skill enables AI agents to programmatically validate Terragrunt configuration files before deployment. It ensures infrastructure-as-code integrity by checking for syntax errors, missing dependencies, and incorrect variable references within your Terraform ecosystem.

When to use it

• Before applying terragrunt init or terragrunt apply in CI/CD pipelines to catch errors early.
• During code reviews to automatically verify that new modules adhere to organizational standards.
• When refactoring existing infrastructure to ensure no broken links or invalid outputs are introduced.
• To integrate into automated testing suites that require strict compliance with Terraform best practices.

Key capabilities

• Validates .terragrunt.hcl files for syntax and structural correctness.
• Checks for missing remote state configurations and output dependencies.
• Detects undefined variables and incorrect input parameter mappings.
• Reports specific line numbers and error messages for failed validations.

Example prompts

• "Validate my entire Terragrunt workspace at /projects/infrastructure and list all configuration errors found."
• "Run a validation check on the aws-vpc module to ensure all required inputs are defined in the parent directory."
• "Scan these .terragrunt.hcl files for missing dependency_blocks that could cause runtime failures during apply."

Tips & gotchas

Ensure your Terragrunt version matches the one used in your target environment, as validation rules may vary between versions. Always run this skill in a clean working directory to avoid caching issues affecting dependency resolution.