CTS allows you to inspect your configuration before applying any change and to run in once mode, meaning that you can verify the changes are correctly applied in a test run before running it in unsupervised daemon mode.
To learn more on these options check the [Consul-Terraform-Sync Run Modes and Status Inspection](https://learn.hashicorp.com/tutorials/consul/consul-terraform-sync-run-and-inspect?utm_source=docs) tutorial.