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$ terraform workspace show
default

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# default ワークスペースを禁止するダミーリソース
resource "null_resource" "forbid_default_workspace" {
  lifecycle {
    precondition {
      condition     = terraform.workspace != "default"
      error_message = "Workspace 'default' is forbidden. Use a named workspace (dev/stg/prod)."
    }
  }
}

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$ terraform plan

╷
│ Error: Workspace 'default' is forbidden. Use a named workspace (dev/stg/prod).
│ 
│   with null_resource.forbid_default_workspace,
│   on main.tf line 1, in resource "null_resource" "forbid_default_workspace":
│    1: resource "null_resource" "forbid_default_workspace" {
│
╵