def pretty_raw_results(results):
    """
    Convert the list of book results into readable text,
    One line per book.
    """
    lines = []
    for r in results:
        title = r.get('title', 'Unknown')
        author = r.get('author', 'Unknown')
        desc = r.get('desc', '')
        line = f"- {title} — {author} — {desc}"
        lines.append(line)
    return "\n".join(lines)

# to test #

from ai_agent import fetch_openlibrary_by_title_or_subject, pretty_raw_results

res = fetch_openlibrary_by_title_or_subject("Atomic Habits")
print(pretty_raw_results(res))