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armanzeroeight
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template-validator

Validate AWS CloudFormation templates for syntax, security, and best practices.

29|7|Updated Oct 13, 2025
Search Tags:#linting#security#aws#validation#cloudformation#iac
One-click install
npx skills add https://github.com/armanzeroeight/fastagent-plugins --skill template-validator
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: template-validator
Source: https://github.com/armanzeroeight/fastagent-plugins/tree/main/plugins/cloudformation-toolkit/skills/template-validator
Command: npx skills add https://github.com/armanzeroeight/fastagent-plugins --skill template-validator

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires cfn-lint, cfn-nag, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps ensure your AWS CloudFormation templates are syntactically correct, secure, and adhere to best practices before deployment, preventing costly errors and security vulnerabilities.

Core Features & Use Cases

  • Syntax Validation: Checks for valid YAML/JSON, correct resource types, and intrinsic function usage.
  • Security Auditing: Identifies overly permissive IAM policies, insecure security group configurations, and other security risks.
  • Best Practice Checks: Enforces naming conventions, proper use of tags, and dependency management.
  • Use Case: Before deploying a new VPC, use this Skill to validate the CloudFormation template, ensuring all security groups are correctly configured and IAM roles follow the principle of least privilege.

Quick Start

Use the template-validator skill to validate the CloudFormation template file named 'template.yaml'.

Frequently Asked Questions about template-validator

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate a CloudFormation template before deploying to AWS?▼

CloudFormation templates are validated for syntax, security vulnerabilities, and best practices using AWS CLI and cfn-lint. This process checks YAML/JSON structure, resource types, and intrinsic functions to prevent deployment errors.

Can cfn-lint check for security vulnerabilities in IAM policies?▼

Security auditing identifies overly permissive IAM policies and insecure security group configurations within CloudFormation templates. This ensures infrastructure adheres to security principles before deployment.

What does CloudFormation best practice validation look for?▼

Best practice validation enforces naming conventions, proper tag usage, and dependency management in CloudFormation templates. It ensures infrastructure as code adheres to established operational standards.

Do I need AWS CLI to run pre-deployment checks on infrastructure as code?▼

Validating CloudFormation templates requires AWS CLI and cfn-lint to perform syntax and security checks. Knowledge of AWS services, CloudFormation syntax, and security principles is required to interpret the validation results.

What is the best way to lint CloudFormation YAML for syntax errors?▼

Using cfn-lint to check CloudFormation YAML for valid syntax, correct resource types, and intrinsic function usage is the best approach. This catches structural issues before they reach your AWS environment.

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