fix(agent): 修复中间件无法载入知识库工具

src/agents/common/middlewares/runtime_config_middleware.py

@@ -85,9 +85,14 @@ class RuntimeConfigMiddleware(AgentMiddleware):
             existing_tools = list(request.tools or [])
             merged_tools = []
             for t_bind in existing_tools:
-                if t_bind in enabled_tools or t_bind not in self.tools:
+                # (1) 已启用的工具保留
+                # (2) 非本中间件管理的工具保留
+                if t_bind.name in [t.name for t in enabled_tools] or \
+                     t_bind.name not in [t.name for t in self.tools]:
                     merged_tools.append(t_bind)
             overrides["tools"] = merged_tools
+            logger.debug(f"RuntimeConfigMiddleware selected tools: {[t.name for t in merged_tools]}")
+
 
         # 3. 系统提示词覆盖（可选）
         if self.enable_system_prompt_override:
@@ -115,8 +120,6 @@ class RuntimeConfigMiddleware(AgentMiddleware):
             for tool_name in tools:
                 if tool_name in tools_map:
                     selected_tools.append(tools_map[tool_name])
-                else:
-                    logger.warning(f"Tool '{tool_name}' not found in available tools. {tools_map.keys()=}")
 
         # 2. 知识库工具
         knowledges = getattr(context, self.knowledges_context_name, None)