The ICommandSender interface is used the base of each Entity and also some other types in CraftTweaker.
Each IEntity and IPlayer implements this!

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import crafttweaker.command.ICommandSender;

ZenGetter	Rückgabetyp
ZenGetter displayName	Rückgabetyp string
ZenGetter position	Rückgabetyp IBlockPos
ZenGetter world	Rückgabetyp IWorld
ZenGetter server	Rückgabetyp IServer

Takes a String Returns void (nothing).

ZenScript
 Copy
sender.sendMessage(String text);

Takes an ITextComponent Returns void (nothing).

ZenScript
 Copy
sender.sendRichTextMessage(ITextComponent textComponent);