1.2 ReAct 循环与上下文消融实验

// ── 最小 TypeScript ReAct 循环驱动实现 ──
import OpenAI from "openai";
 
async function runAgent(userPrompt: string, tools: any[]) {
  const client = new OpenAI();
  const messages: any[] = [
    { role: "system", content: "You are an autonomous assistant." },
    { role: "user", content: userPrompt }
  ];
 
  let iterations = 0;
  const MAX_ITERATIONS = 10; // 必须设置硬上限熔断！
 
  while (iterations++ < MAX_ITERATIONS) {
    const res = await client.chat.completions.create({
      model: "gpt-4o",
      messages,
      tools
    });
 
    const assistantMsg = res.choices[0].message;
    messages.push(assistantMsg); // 必须原样塞回轨迹
 
    // 终止条件：若模型未发起工具调用，说明已得出最终答案
    if (!assistantMsg.tool_calls || assistantMsg.tool_calls.length === 0) {
      console.log("任务完成:", assistantMsg.content);
      return assistantMsg.content;
    }
 
    // 遍历执行工具调用（可并行执行）
    for (const call of assistantMsg.tool_calls) {
      const output = await executeLocalTool(call.function.name, call.function.arguments);
      messages.push({
        role: "tool",
        tool_call_id: call.id, // 核心信物，必须精准对应
        content: JSON.stringify(output)
      });
    }
  }
 
  throw new Error("超过最大循环迭代次数，触发安全熔断！");
}