One-sentence world
The world is: [ONE SENTENCE THAT ESTABLISHES SETTING + STAKES]. Example: "It's 2am, we've been arguing about whether to move in together for three hours, and neither of us has said what we actually want." Start in media res.
Why this works
Establishing setting AND stakes in one sentence gives the model everything it needs without bloating context. Most users overwrite the world and underwrite the stakes.