now that we have this, add a tab or button called "context" or "control context" that allows shows you all the previous set of messages sent in the chat(smaller/summary of each because there might be long context) users should be able to either negate context, add context, add all above, etc

I love the context button! just make it not be like check boxes but each message highlights on hover and you can hover for different options in the top left with a check for add to context, x for remove from context, etc