Total War: Shogun 2 – Creative Assembly released its developer kit for modders to work with, possibly in an attempt to bring positive relations between the developers and the modders, or to make a move to bring attention to the game and follow suit of a lot of developers in the Steam market. The developers pack of tools is called the “Assembly Kit,” and is fully integrated with Steam’s workshop.
It comes with plenty of tools, like some pre-written scripts, database editor, and data packaging. It comes with the game when purchased and can be downloaded through Steam’s Tool section of the console after the game’s installation.
Source: [Total War Center]