重构：移除对 debug_info 的依赖，只使用新的结构化状态字段

backend/app/main_graph/nodes/fast_paths.py

@@ -44,9 +44,6 @@ async def fast_chitchat_node(state: MainGraphState, config: Optional[RunnableCon
     # 标记快速路径成功，但不设置 final_result，让 llm_call 生成回答
     state.success = True
     state.current_phase = "llm_call"
-    state.debug_info["fast_chitchat_success"] = True
-    
-    # 更新新的结构化字段
     state.fast_path.chitchat_success = True
 
     # 发送完成事件
@@ -168,7 +165,7 @@ async def _generate_fast_answer(state: MainGraphState, query: str) -> MainGraphS
         state.final_result = full_content
         state.success = True
         state.current_phase = "finalizing"
-        state.debug_info["fast_rag_success"] = True
+        state.fast_path.rag_success = True
         return state
 
     except Exception as e:
@@ -181,8 +178,8 @@ async def fast_tool_node(state: MainGraphState, config: Optional[RunnableConfig]
     """快速工具节点"""
     state.current_phase = "fast_tool"
 
-    decision = state.debug_info.get("hybrid_decision", {})
+    decision = state.hybrid_router.decision
-    suggested_tools = decision.get("suggested_tools", [])
+    suggested_tools = decision.suggested_tools if (decision and hasattr(decision, 'suggested_tools')) else []
     info(f"[Fast Tool] 开始处理，建议工具: {suggested_tools}")
 
     await dispatch_custom_event("fast_path_start", {"path": "fast_tool", "suggested_tools": suggested_tools}, config)
@@ -197,16 +194,23 @@ async def fast_tool_node(state: MainGraphState, config: Optional[RunnableConfig]
     return _mark_fast_path_failed(state, "快速工具调用暂未完善")
 
 
+# ========== 条件路由函数 ==========
+def check_fast_path_success(state: MainGraphState) -> str:
+    """检查快速路径是否成功 - 使用新的结构化字段"""
+    if state.fast_path.failed:
+        info("[Fast Path Check] 快速路径失败，升级到 React 循环")
+        return "escalate"
+    
+    info("[Fast Path Check] 快速路径成功，进入 llm_call")
+    return "llm_call"
+
+
 # ========== 公共函数 ==========
 def _mark_fast_path_failed(state: MainGraphState, reason: str = "") -> MainGraphState:
-    """标记快速路径失败，准备升级到 React 循环"""
+    """标记快速路径失败，准备升级到 React 循环 - 使用新的结构化字段"""
-    state.debug_info["fast_path_failed"] = True
-    state.debug_info["fast_path_fail_reason"] = reason
-    state.success = False
-    
-    # 更新新的结构化字段
     state.fast_path.failed = True
     state.fast_path.fail_reason = reason
+    state.success = False
     
     info(f"[Fast Path] 标记失败，准备升级: {reason}")
     return state
@@ -217,5 +221,6 @@ __all__ = [
     "fast_chitchat_node",
     "fast_rag_node",
     "fast_tool_node",
+    "check_fast_path_success",
     "_mark_fast_path_failed",
 ]

backend/app/main_graph/nodes/hybrid_router.py

@@ -187,17 +187,7 @@ async def hybrid_router_node(state: MainGraphState, config: Optional[RunnableCon
         info("[Hybrid Router] 规则未命中，使用 LLM 分类")
         decision = await _classify_with_llm(query)
 
-    # 3. 更新状态（同时更新旧的 debug_info 和新的结构化字段）
+    # 步骤3: 更新状态 - 只使用新的结构化字段
-    state.debug_info["hybrid_decision"] = {
-        "intent": decision.intent,
-        "confidence": decision.confidence,
-        "path": decision.path,
-        "reasoning": decision.reasoning,
-        "suggested_tools": decision.suggested_tools
-    }
-    state.debug_info["hybrid_start_time"] = datetime.now().isoformat()
-    
-    # 更新新的结构化字段
     state.hybrid_router.decision = decision
     state.hybrid_router.start_time = datetime.now().isoformat()
 
@@ -221,9 +211,11 @@ async def hybrid_router_node(state: MainGraphState, config: Optional[RunnableCon
 
 # ========== 条件路由函数 ==========
 def route_from_hybrid_decision(state: MainGraphState) -> str:
-    """从混合路由决策获取下一步节点"""
+    """从混合路由决策获取下一步节点 - 使用新的结构化字段"""
-    decision = state.debug_info.get("hybrid_decision", {})
+    decision = state.hybrid_router.decision
-    return decision.get("path", "react_loop")
+    if decision and hasattr(decision, 'path'):
+        return decision.path
+    return "react_loop"
 
 
 def check_fast_path_success(state: MainGraphState) -> str:

backend/app/main_graph/nodes/rag_nodes.py

@@ -48,8 +48,8 @@ async def _rag_retrieve_core(state: MainGraphState, pipeline) -> MainGraphState:
     """执行 RAG 检索的核心逻辑"""
     retrieval_query = state.user_query
 
-    # 优先使用推理结果中的优化查询
+    # 优先使用推理结果中的优化查询 - 从新的结构化字段获取
-    reasoning_result = state.debug_info.get("reasoning_result")
+    reasoning_result = state.react_reasoning.reasoning_result
     if reasoning_result and hasattr(reasoning_result, "retrieval_config"):
         cfg = reasoning_result.retrieval_config
         if cfg and cfg.retrieval_query:
@@ -67,8 +67,7 @@ async def _rag_retrieve_core(state: MainGraphState, pipeline) -> MainGraphState:
     state.rag_docs = documents  # 保存文档用于置信度评估
     state.rag_retrieved = bool(documents)  # 有文档才算检索成功
     state.rag_attempts = getattr(state, 'rag_attempts', 0) + 1
-    state.debug_info["rag_source"] = "pipeline"
+    # 移除对 debug_info 的依赖，不再保存 rag_scores
-    state.debug_info["rag_scores"] = pipeline.last_scores  # 保存分数信息
 
     return state
 
@@ -148,16 +147,7 @@ async def _evaluate_rag_confidence(state: MainGraphState) -> float:
 
 
 def _get_embedding_similarity(state: MainGraphState) -> float:
-    """从 rag_scores 或 rag_docs 中获取向量相似度分数"""
+    """从 rag_docs 中获取向量相似度分数（不再从 debug_info 获取）"""
-    # 优先从 pipeline 提供的分数中获取
-    rag_scores = state.debug_info.get("rag_scores", [])
-    if rag_scores:
-        scores = [s.get("embedding_score", 0.0) for s in rag_scores]
-        if scores:
-            # 归一化到 0-1
-            normalized = [min(s / 10.0, 1.0) if s > 1.0 else s for s in scores]
-            return max(normalized)
-
     # 降级：从 rag_docs 中获取
     rag_docs = getattr(state, "rag_docs", [])
     scores = []
@@ -176,13 +166,7 @@ def _get_embedding_similarity(state: MainGraphState) -> float:
 
 
 def _get_rerank_score(state: MainGraphState) -> float:
-    """从 rag_scores 或 rag_docs 中获取重排序分数"""
+    """从 rag_docs 中获取重排序分数（不再从 debug_info 获取）"""
-    # 优先从 pipeline 提供的分数中获取
-    rag_scores = state.debug_info.get("rag_scores", [])
-    if rag_scores:
-        scores = [s.get("rerank_score", 0.0) for s in rag_scores]
-        return max(scores) if scores else 0.0
-
     # 降级：从 rag_docs 中获取
     rag_docs = getattr(state, "rag_docs", [])
     scores = []

backend/app/main_graph/nodes/reasoning.py

@@ -47,22 +47,14 @@ async def react_reason_node(state: MainGraphState, config: Optional[RunnableConf
         "timestamp": datetime.now().isoformat()
     })
 
-    # 步骤4: 更新调试信息（同时更新旧的 debug_info 和新的结构化字段）
+    # 步骤3: 更新状态 - 只使用新的结构化字段
-    state.debug_info["last_reasoning"] = {
-        "action": result.action.name,
-        "confidence": result.confidence,
-        "reasoning": result.reasoning
-    }
-    state.debug_info["reasoning_result"] = result
-    state.last_action = result.action.name
-    
-    # 更新新的结构化字段
     state.react_reasoning.last_reasoning = {
         "action": result.action.name,
         "confidence": result.confidence,
         "reasoning": result.reasoning
     }
     state.react_reasoning.reasoning_result = result
+    state.last_action = result.action.name
 
     # 步骤5: 发送推理事件
     await dispatch_custom_event(