Advice needed: Chat history with custom agents using DelegatingAIAgent

[Dazfl]

I'm looking for some advice regarding chat history and calling sub-agents from a custom agent.

If I have a custom agent define using the DelegatingAIAgent, that makes a call to a sub-agent ...

internal sealed MyAgent(AIAgent innerAgent) : DelegatingAIAgent(innerAgent)
{
   ...
   public override asyn Task<AgentResponseUpdate> RunCoreStreamingAsync(IEnumerable<ChatMessage> messages, ...)
   {
      ...
      var subAgentResponse = await subAgent.RunAsync(query);
      ...
   }
}

... and if there is some back and forth with a user (clarifying questions, etc), what is the best way for the subAgent to keep track of the conversation?

• Is it as simple as sending the full chat history (IEnumerable<ChatMessage>) to the subAgent?
• Should the subAgent have chat memory configured and then I just pass in the last message?
• Would OpenAI Responses be better here instead of Chat Completions?

I know this is probably a case of 'there is no one solution', but I'm just interested to see how others have handled this scenario.