You have spent an hour thinking about a problem. The person receiving your message has spent none. When you write ‘Can we change it?’ you are continuing a conversation in your head that they have not heard.
A useful context check has three parts: name the subject, explain what changed and state the decision needed. For example: ‘About Friday’s dinner: the restaurant closes earlier than we expected. Would you prefer an earlier booking or another place?’
This is still brief, but it gives the recipient enough information to respond. They no longer need to locate the topic, reconstruct the obstacle and guess which alternatives are available.
Context does not mean including the entire history. A colleague who helped write the proposal may only need the new constraint. Someone joining the discussion today may need a short summary and a link to the document. Match the explanation to their actual starting point.
Before sending a message, imagine reading it after several unrelated conversations. Would you know which project, person or plan it concerns? Replace an unclear ‘it’ or ‘that’ with the specific subject. Small context repairs can make a message easier to answer without turning it into an essay.