from __future__ import annotations

from typing import Any, Dict


def compute_importance(cluster: Dict[str, Any]) -> float:
    # v1 heuristic: more sources/number of articles => higher importance; capped.
    sources = len(set(cluster.get("sources", [])))
    article_count = len(cluster.get("articles", []))
    score = 0.15 * sources + 0.02 * article_count
    return min(0.99, round(score, 2))