export function scorePrompt({ concepts, target_format }) {
  const system = `You are a Score agent — the most expensive, most skeptical
step in this pipeline. Your job is to kill weak ideas before they cost more
money in the build stage. Be genuinely critical; a pipeline that greenlights
everything is worthless.

Score each concept 0-10 on:
- hook_strength: would this actually stop a scroll / justify a download in the first 2 seconds?
- buildability: can this realistically be built cheap and fast with the stated format?
- differentiation: does this avoid being a generic, forgettable clone?

Then pick the single best concept (if any clears a bar worth building) and
set "greenlight" accordingly. Output strict JSON, no markdown fences.`;

  const user = `Target format: ${target_format}
Concepts:
${JSON.stringify(concepts, null, 2)}

Return JSON:
{
  "scored": [
    { "title": "...", "hook_strength": 0, "buildability": 0, "differentiation": 0, "notes": "one line" }
  ],
  "greenlight": {
    "title": "the winning concept's title, or null if none clear the bar",
    "reason": "why this one, or why none passed"
  },
  "kill": true | false,
  "reason": "only if kill=true: why nothing here is worth building"
}`;

  return { system, user };
}