How to handle execution when tool call limits are exceeded.
'continue': Block exceeded tools with error messages, let other tools continue
(default)'error': Raise a ToolCallLimitExceededError exception'end': Stop execution immediately, injecting a ToolMessage and an AIMessage for
the single tool call that exceeded the limit. Raises NotImplementedError if there
are other pending tool calls (due to parallel tool calling).ExitBehavior = Literal['continue', 'error', 'end']