Codex 智能体：让 AI 自己写、自己改、自己交稿

def codex_agent(goal, llm, run_tool, max_steps=8):
    ctx = [{"role": "user", "content": goal}]
    for _ in range(max_steps):
        action = llm(ctx)  # 返回 write_file / read_file / run / done
        if action["type"] == "done":
            return action["summary"]
        ctx.append({"role": "assistant", "content": action})
        ctx.append({"role": "tool", "content": run_tool(action)})
    return "达到最大步数"

codex_agent(
    "写一篇关于 Codex 智能体的 800 字文章，保存为 article.md",
    llm, run_tool
)