YAML 反斜杠修复扩大范围 — 之前只匹配 "D:\..." 格式，现在匹配所有双引号内含反斜杠的字符串。"outputs\session_20260420..." 会被正确转成 "outputs/session_20260420..."，不再导致 YAML 解析失败。这直接解决了第 10-19 轮的死循环。

_process_response 的 analysis_complete 检测已经在上一轮修好了，配合反斜杠修复，YAML 能正确解析出 action: "analysis_complete"，不会再 fallback 到代码执行。

文件选择改为只用最近一次上传的文件 — app.state.last_uploaded_files 记录上传的文件列表，/api/start 优先使用它，不再 glob("uploads/*.csv") 把所有历史文件都拿来分析。

data_analysis_agent.py

@@ -139,7 +139,21 @@ class DataAnalysisAgent:
         """
         try:
             yaml_data = self.llm.parse_yaml_response(response)
-            action = yaml_data.get("action", "generate_code")
+            action = yaml_data.get("action", "")
+
+            # If YAML parsing returned empty/no action, try to detect action from raw text
+            if not action:
+                if "analysis_complete" in response:
+                    action = "analysis_complete"
+                    # Try to extract final_report from raw text
+                    if not yaml_data.get("final_report"):
+                        yaml_data["action"] = "analysis_complete"
+                        yaml_data["final_report"] = ""
+                elif "collect_figures" in response:
+                    action = "collect_figures"
+                    yaml_data["action"] = "collect_figures"
+                else:
+                    action = "generate_code"
 
             print(f"[TARGET] 检测到动作: {action}")
 
@@ -155,6 +169,11 @@ class DataAnalysisAgent:
 
         except Exception as e:
             print(f"[WARN] 解析响应失败: {str(e)}，尝试提取代码并按generate_code处理")
+            # Check if this is actually an analysis_complete or collect_figures response
+            if "analysis_complete" in response:
+                return self._handle_analysis_complete(response, {"final_report": ""})
+            if "collect_figures" in response:
+                return self._handle_collect_figures(response, {"figures_to_collect": []})
             # 即使YAML解析失败，也尝试提取代码
             extracted_code = extract_code_from_response(response)
             if extracted_code: