The HashiCorp platform team automates their HCP Terraform workspace setup and onboarding process using a custom module, the TFE provider, and good requirements gathering. They create an onboarding module that generates workspaces for a new application team with reusable code, documentation, and automated tests. The module uses variables to capture team-specific requirements, including environment names, admin teams, user teams, and application IDs. It also includes validation rules to ensure the environment landscape is correct. The platform team reviews their objectives, including getting the team up and running quickly and creating a reusable onboarding pattern. They ask questions about the team's environment landscape, permissions, and workspace naming conventions. After gathering requirements, they create a Terraform module with input variables for environment names, admin teams, user teams, and application IDs. The module generates workspaces based on these inputs and includes outputs for workspace IDs, admin team IDs, and user team IDs. The platform team also writes automated tests to validate the environment landscape and workspace name formatting. They publish their module in a private registry and provide documentation and examples for users. Potential enhancements include introducing HCP Terraform projects, configuring workspace notifications, using dynamic provider credentials, and implementing module lifecycle management.