Part 2: It is therefore called the craftsman’s tool of the Holy One, blessed be He. From the point of view of its esoteric meaning, the Torah is called “plans and registers... as used by a master builder to know how to make the rooms and how to make the openings...” (Bereishit Rabbah, beginning). In other words, the content and esoteric meanings of the words of the Torah explain the “why” of creation: its blueprint and reasons.
But besides this, the actual letters of the Torah are literally the craftsman’s tools with which the work is actually executed. This comes about through the different permutations of letters, as in the case of the various names, which can visibly be seen to bring about an immediate effect either through their very mention or when they are used in other ways (such as in writing in the form of amulets, or in meditation in the form of Yichudim).
Thus everything is contained in the Torah, including both the underlying thoughts and arrangement of creation, which are contained in the esoteric meanings of the words of the Torah, and the execution of these thoughts in actuality through the permutations of its Holy Names.