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A brief is a shared starting point.
A useful brief gives a conversation somewhere to begin. It does not need to contain every answer. It needs to show what is already known and what still needs a decision.
Start with the purpose. Describe the thing you are trying to make or change and who will use it. A specific sentence is easier to discuss than a list of broad ambitions.
Put the constraints on the page.
Record the intended date, the materials you have and any practical limits. If a detail is uncertain, write that down. An honest gap is more useful than an invented answer.
Next, name the decisions that matter. Who approves the words? Who supplies the images? Who will arrange production? A brief becomes useful when responsibilities are visible.
Keep a record of the next step.
After the conversation, write what was agreed and what remains open. Keep the record short enough for everyone involved to read. Return to it when the scope changes.
The same method works for a small workshop, a printed guide or an event detail: begin with the purpose, make the constraints visible and agree the next action.