Worked on the hashicorp/terraform-provider-hcp repository to deprecate and disable the starter_small tier for HCP Vault clusters, ensuring compliance with product lifecycle changes. Implemented validation logic in Go and Terraform to prevent selection of the deprecated tier, producing clear errors to avoid misconfigurations and unsupported deployments. Updated Markdown documentation to communicate the deprecation, outline usage constraints, and provide migration guidance for users. Focused on codifying deprecation rules within resource validation to improve maintainability and governance of the provider. The work emphasized stability and policy compliance, with no major bugs addressed during this period, centering efforts on feature deprecation and documentation.