Validate AWS resource tags against naming conventions and required-tag policies.
Last verified: May 2026
Output will appear here...AWS resource tags are key-value pairs used for cost allocation, access control, automation, and organizational compliance. Many organizations enforce tagging policies through AWS Organizations SCPs or AWS Config rules that require specific tags like Environment, Owner, and CostCenter on every resource. This validator checks your tags against configurable naming conventions, required-tag policies, and AWS technical constraints — including the 128-character key limit, 256-character value limit, and the aws: reserved prefix restriction — before you create resources and trigger compliance violations.
Your finance team complains that 30% of monthly EC2 spend is showing up as 'untagged' in Cost Explorer despite a strict tagging policy. You audit a sample of untagged instances with the validator and discover that several Auto Scaling Groups were created with tag keys exceeding 128 characters because someone embedded a long deployment ID in the key name. AWS silently dropped the tags during launch. You fix the launch template, update your CI to validate tags before deploy, and recover full cost visibility within a billing cycle.
Tag values that contain commas, equals signs, or special characters get silently truncated by some AWS services even though the API accepts them. If your cost allocation reports show unexpected blank tag values, check whether your tag values contain characters that need escaping in CSV or query string contexts.
AWS Config's required-tags rule checks tag *keys* but not tag *values*. A resource with Environment=foo passes the rule even though 'foo' is meaningless. Pair required-tags with custom Lambda rules that validate values against an allow-list to actually enforce hygiene.
Tags propagate inconsistently across AWS services. EBS volumes attached at instance launch time inherit instance tags only if you set PropagateTagsAtLaunch on the launch template — otherwise they're untagged and invisible to your cost allocation reports until you backfill them.
The validator runs each tag key and value through three layers of checks: first the AWS technical limits (128-character key, 256-character value, allowed character set, no aws: prefix), then your configured naming convention rules (e.g., kebab-case keys, allowed value patterns), and finally any required-tag policies you supply (e.g., Environment, Owner, CostCenter must be present). Each violation includes the specific rule that failed so you can fix it before deployment.
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