Does BookyAI invent details when it writes my story from the interview?

It is built not to, and it shows you. In Interview Mode (version 1.9.18 and later) every instruction to the AI carries the same rule: never invent a fact, a name, a place, a date, a number, a line of dialogue or a feeling that you did not give; a missing detail is asked for, never filled in. Before you accept the passage you see your answers on the left and the passage on the right. Move the mouse over a sentence and the answer it came from lights up. A paler sentence is a link between two moments and adds no fact. BookyAI also compares every name and number in the passage with what you said and with your chapter: one that appears in neither gets a wavy amber line and the note "Not in your answers: check it". If you see one, press "Write again", or accept and correct that sentence in the editor.