As precise and unambiguous as is necessary to communicate your meaning, and no more. Said communication should, relatedly, take into account the assumption that what you are trying to communicate is relevant, and that your conversational partner knows this, and knows that you know this, and that you can therefore leave unstated in the text otherwise vital information if it may be readily surmised by the prior knowledge of your conversational partner and their knowledge that what you are saying is relevant.
I understand that there are competing models, and that this model does not account for all conversation, but I think itās a decent rough sketch of the implicit assumptions we have when communicating: Griceās Maxims of Conversation: The Principles of Effective Communication ā Effectiviology.


