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	반환 타입
ZenGetter displayName	반환 타입 string
ZenGetter position	반환 타입 IBlockPos
ZenGetter world	반환 타입 IWorld
ZenGetter server	반환 타입 IServer

Takes a String Returns void (nothing).

ZenScript
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sender.sendMessage(String text);

Takes an ITextComponent Returns void (nothing).

ZenScript
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sender.sendRichTextMessage(ITextComponent textComponent);