SDK stands for Software Development Kit.
When I read that I assume it gives me the possibility to program TC. But that is not the case. You need an extra tool to create a program, macro or however you will name that.
In former times there was vba included (that was a SDK in my eyes). That was fast and efficient. But that is long ago.
Now you can use e.g. AutoIT – that is public domain. Or VB, C++ ….
So in my eyes TC offers only a programmers interface.