how to set qa_template for chat engine

How can I force OpenAiAgent to always use query engine tool

Thanks for the suggestion. But unfortunately GPTVectorStoreIndex will not return correct response (it actually give something like "The context doesn't contain information about ...")

which kwargs can be used with load_index_from_storage?

Where did prepend_messages go?

What is the best way to construct index from emails? I would like to create an email bot that's capable of answering as a person

I need help with prompt engineering. How can I make the engine to answer the general questions like "How is your day" which clearly is not covered in the context provided, like a human would answer?

how can I force an agent created with create_llama_chat_agent to use only the context information?