Choose the right purpose for the message
Decide whether the message is meant to inform, apologize, ask, support, or close a practical loop. For a message about how to tell your parents you failed an important exam, use this factual base: lead with the confirmed event, what it changes, who already knows, and any practical next step.
Use detail that helps a decision
Include the smallest set of details that lets the recipient understand the impact and choose a response. Say what support or decision is needed now and make clear when no response is required. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Know what the message cannot achieve
Do not hide the central fact behind a long preface, speculate, or offer reassurance you cannot support. For death, abuse, medical emergencies, legal danger, or immediate safety risk, use qualified and urgent support first. The message can offer clarity, but it cannot guarantee forgiveness, agreement, attention, or renewed contact.