导入方式修改

backend/app/agent/agent_service.py

@@ -7,6 +7,9 @@ import json
 import asyncio
 from typing import AsyncGenerator, Dict, Any, Optional, Tuple
 
+# LangGraph 序列化器（修复 checkpoint 反序列化警告）
+from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+
 # 本地模块
 from ..model_services import get_cached_chat_services
 from ..main_graph.main_graph_builder import build_react_main_graph
@@ -18,6 +21,23 @@ from ..logger import debug, info, warning, error
 from ..main_graph.state import MainGraphState, CurrentAction
 
 
+# ========== 自定义类型序列化器 ==========
+def create_serde() -> JsonPlusSerializer:
+    """创建带自定义类型注册的序列化器"""
+    from backend.app.core.intent import ReasoningAction, RetrievalConfig, ReasoningResult
+
+    return JsonPlusSerializer(
+        allowed_msgpack_modules=[
+            ("app.core.intent", "ReasoningAction"),
+            ("app.core.intent", "RetrievalConfig"),
+            ("app.core.intent", "ReasoningResult"),
+            ("app.main_graph.state", "CurrentAction"),
+            ("app.main_graph.state", "ErrorSeverity"),
+            ("app.main_graph.state", "ErrorRecord"),
+        ]
+    )
+
+
 class AIAgentService:
     def __init__(self, checkpointer):
         self.checkpointer = checkpointer
@@ -55,6 +75,7 @@ class AIAgentService:
             tools=self.tools,
             mem0_client=self.mem0_client
         )
+        # 注意：serde 已在创建 checkpointer 时传入，这里只需传入 checkpointer
         self.graph = graph_builder.compile(checkpointer=self.checkpointer)
         info(f"✅ 单图初始化完成")
         

backend/app/agent/history.py

@@ -4,7 +4,7 @@
 """
 
 from typing import List, Dict, Any
-from app.logger import error # 保持兼容，或者替换为 logger
+from ..logger import error # 保持兼容，或者替换为 logger
 
 class ThreadHistoryService:
     """线程历史查询服务"""