What does "Check my chapters" on the Mystery board tell me?

From version 1.9.22, "Check my chapters" (in the Codex, Mystery tab) reads your written chapters against the saved board, one AI request per chapter. For each chapter it reports: "Planted" for a clue that is really there, with the sentence that plants it; "Not found" for a planned clue the chapter left out; "Gives the truth away too early" for a passage that makes the reader suspect the culprit before the reveal, with the quote and why; and "Not in the plan" for a clue the chapter added on its own, which "Add to the board" keeps. Save the board before you run it. You can press Stop at any time.