I feel like a broken record about this, but I’ve found the games that have tried this so far kind of frustrating because it’s not clear what they’re translating your input into or why it wasn’t understood in its original form, so although with traditional parsers my take has always been “If you can tell me I can’t read the book because I’m not holding it, you can (and should) make me try taking the book first instead,” I do see in this case why Draconis would suggest having it tell the player what syntax to use instead. I would at least want a “didn’t understand X, trying Y” sort of message when it translates a command.