About knowledge retrieval design

[wingjson]

Hi, I found an issue with agent retrieval. The retrieval question is being combined with the conversation history. For example, if I ask "hi, how are you?" the retrieval question becomes something like:
hi, how are you?
what's the weather today? (this is the history question)
I think this could impact retrieval accuracy. I believe we should only use the latest question ("hi, how are you?") for retrieval. I've tested it, and in cases where unrelated questions are combined, the retrieval often returns no relevant results. Should we change this behavior, or is it a bug?