main.tf

resource "null_resource" "echo" {
  triggers = {
    x = var.primary_configuration.x
    y = var.primary_configuration.y
    z = var.primary_configuration.z
  }

  provisioner "local-exec" {
    command = <<EOS
echo x=${var.primary_configuration.x} y=${var.primary_configuration.y} z=${var.primary_configuration.z}
EOS
  }
}

variables.tf

variable "primary_configuration" {
  type = object({
    x = number
    y = number
    z = number
  })
}