diff --git a/mcp_server.py b/mcp_server.py
index 81f95e68..26b0f61d 100644
--- a/mcp_server.py
+++ b/mcp_server.py
@@ -2634,9 +2634,13 @@ class MCPAgentIntegrated:
             # 收集成功的结果
             successful_results = [r for r in step_results if r.status == "success"]
 
+            # 初始化 final_summary
+            final_summary = ""
+
             if not successful_results:
+                final_summary = "很抱歉，所有步骤都执行失败，无法生成分析报告。"
                 yield self._format_sse("summary", {
-                    "content": "很抱歉，所有步骤都执行失败，无法生成分析报告。",
+                    "content": final_summary,
                     "metadata": {
                         "total_steps": len(plan.steps),
                         "successful_steps": 0,