Each tag is a simple label consisting of a customer-defined key and an optional value that can make it easier to manage, search for, and filter resources. IAM policies also support tag-based conditions, enabling you to constrain IAM permissions based on specific tags or tag values. For example, you can tag your repositories to ensure only selected groups of users have access based on those tags.
These features are provided at no additional cost. To learn more about AWS CodeCommit and tagging, see the documentation. See AWS Tagging Strategies for general best practices for using tags with AWS resources.