! cue notool
! stdout .
cmp stderr cmd_baddisplay.out

-- cmd_baddisplay.out --
command "notool" is not defined
Ensure commands are defined in a "_tool.cue" file.
Run 'cue help' to show available commands.
-- task.cue --
package home
message: "Hello world!"

command: notool: {
	task: display: {
		kind: "print"
		text: 42
	}
}