from typing import Union, List, Dict, Any, Sequence, Callable, Tuple

Context_T = Dict[str, Any]
Message_T = Union[str, Dict[str, Any], List[Dict[str, Any]]]
Expression_T = Union[str, Sequence[str], Callable]
CommandName_T = Tuple[str, ...]
CommandArgs_T = Dict[str, Any]
State_T = Dict[str, Any]