fix(app):

1. Token consumption of the omni model;
2. Token consumption of the cluster includes sub-agents

api/app/core/agent/langchain_agent.py

@@ -254,6 +254,33 @@ class LangChainAgent:
 
         return messages
 
+    @staticmethod
+    def _extract_tokens_from_message(msg) -> int:
+        """从 AIMessage 或类似对象中提取 total_tokens，兼容多种 provider 格式
+
+        支持的格式：
+        - response_metadata.token_usage.total_tokens (OpenAI/ChatOpenAI)
+        - response_metadata.usage.total_tokens (部分 provider)
+        - usage_metadata.total_tokens (LangChain 新版)
+        """
+        total = 0
+        # 1. response_metadata
+        response_meta = getattr(msg, "response_metadata", None)
+        if response_meta and isinstance(response_meta, dict):
+            # 尝试 token_usage 路径
+            token_usage = response_meta.get("token_usage") or response_meta.get("usage", {})
+            if isinstance(token_usage, dict):
+                total = token_usage.get("total_tokens", 0)
+        # 2. usage_metadata（LangChain 新版 AIMessage 属性）
+        if not total:
+            usage_meta = getattr(msg, "usage_metadata", None)
+            if usage_meta:
+                if isinstance(usage_meta, dict):
+                    total = usage_meta.get("total_tokens", 0)
+                else:
+                    total = getattr(usage_meta, "total_tokens", 0)
+        return total or 0
+
     def _build_multimodal_content(self, text: str, files: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
         """
         构建多模态消息内容
@@ -412,8 +439,7 @@ class LangChainAgent:
                     else:
                         content = str(msg.content)
                         logger.debug(f"转换为字符串: {content[:100]}...")
-                    response_meta = msg.response_metadata if hasattr(msg, 'response_metadata') else None
-                    total_tokens = response_meta.get("token_usage", {}).get("total_tokens", 0) if response_meta else 0
+                    total_tokens = self._extract_tokens_from_message(msg)
                     break
 
             logger.info(f"最终提取的内容长度: {len(content)}")
@@ -458,7 +484,7 @@ class LangChainAgent:
             user_rag_memory_id: Optional[str] = None,
             memory_flag: Optional[bool] = True,
             files: Optional[List[Dict[str, Any]]] = None  # 新增：多模态文件
-    ) -> AsyncGenerator[str, None]:
+    ) -> AsyncGenerator[str | int, None]:
         """执行流式对话
 
         Args:
@@ -594,15 +620,13 @@ class LangChainAgent:
 
                 logger.debug(f"Agent 流式完成，共 {chunk_count} 个事件")
                 # 统计token消耗
+                # 统计 token 消耗：优先使用流式过程中捕获的值，回退到最后 event 的 messages
                 output_messages = event.get("data", {}).get("output", {}).get("messages", [])
                 for msg in reversed(output_messages):
                     if isinstance(msg, AIMessage):
-                        response_meta = msg.response_metadata if hasattr(msg, 'response_metadata') else None
-                        total_tokens = response_meta.get("token_usage", {}).get(
-                            "total_tokens",
-                            0
-                        ) if response_meta else 0
-                        yield total_tokens
+                        stream_total_tokens = self._extract_tokens_from_message(msg)
+                        logger.info(f"流式 token 统计: total_tokens={stream_total_tokens}")
+                        yield stream_total_tokens
                         break
                 if memory_flag:
                     await write_long_term(storage_type, end_user_id, message_chat, full_content, user_rag_memory_id,