How to custom the event is_final_response() method

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Is your feature request related to a specific problem?

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when i develop a custom agent, i want to continue the agent and added some user defined prompts into llm message history,
So is there anyway can used by developers to change the behavior of this method? some custom agents may have their own logic to check wether the agent should be end or not.

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i want this asap.

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