diff --git a/.gitignore b/.gitignore
index e9c7a38..7ad9179 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,3 +56,4 @@ backend/xingbang_output/
 backend/xingbang_evolution/
 backend/diag_single_agent.py
 backend/run_full_workflow.py
+backend/verify_offline.py
diff --git a/backend/xingbang/agents.py b/backend/xingbang/agents.py
index 2edecb2..df17504 100644
--- a/backend/xingbang/agents.py
+++ b/backend/xingbang/agents.py
@@ -114,8 +114,27 @@ class XingbangAgent:
             "system": self.spec.system_prompt[:500],
             "task": task[:300],
         })
-        result = await agent.ainvoke({"messages": messages})
-        final = self._extract_text(result)
+        import asyncio
+        max_retries = 4
+        backoff = 5  # 初始等待秒
+        last_err = None
+        for attempt in range(max_retries):
+            try:
+                result = await agent.ainvoke({"messages": messages})
+                final = self._extract_text(result)
+                break
+            except Exception as e:  # noqa
+                last_err = e
+                msg = str(e)
+                # 仅对 503/限流 重试
+                if "503" in msg or "overloaded" in msg or "429" in msg:
+                    if attempt < max_retries - 1:
+                        await asyncio.sleep(backoff * (2 ** attempt))
+                        continue
+                else:
+                    raise  # 非限流错误立即失败
+        else:
+            raise RuntimeError(f"网关过载重试后仍失败: {last_err}")
         # 保存产出到文件
         file_path = None
         if self._output_dir: