The oracle.

The clairvoyance test: a question is well defined only if a clairvoyant who knew the future could answer it without asking what you meant (Howard's clarity test)

Answers exactly what is asked and nothing more: a vague question gets a useless true answer, which is how the characters, and the reader, learn to define

Monty Carlo shows a thousand futures; the oracle knows the one that happens but can only say what was precisely asked.

• Definition before decision