These tools are not official. They are passion projects created by reverse-engineering the game’s data structure. The most famous versions were released by Chinese modding communities (like 3DM or Ali213) and later translated into English by fans.
(full Python script available in supplementary materials).
If you’re a first-time player experiencing the story of Shu, Wei, Wu, or Yuan Shao for the first time, I encourage you to play the game vanilla. The brutal difficulty of acquiring Lu Bu’s 4th weapon (Sky Scorcher) is part of gaming folklore.