Hi Sarah,
If you look at the Geometry Commands and Topology Commands chapters of the Test Harness User's Guide, you will find a wide range of Draw commands which implement the documented C++ classes.
To give two examples, chamf corresponds to BRepFilletAPI_MakeChamfer and blend to BRepAlgoAPI_Fuse.
By comparing commands and their underlying API files, you should be able to understand the various arguments better.
Best regards,
Commenter-1