mcp use ObjectView format default

core/src/main/java/com/taobao/arthas/core/mcp/util/McpObjectVOFilter.java

@@ -4,7 +4,9 @@ import com.alibaba.fastjson2.JSON;
 import com.alibaba.fastjson2.JSONFactory;
 import com.alibaba.fastjson2.JSONWriter;
 import com.alibaba.fastjson2.filter.ValueFilter;
+import com.taobao.arthas.core.GlobalOptions;
 import com.taobao.arthas.core.command.model.ObjectVO;
+import com.taobao.arthas.core.view.ObjectView;
 import com.taobao.arthas.mcp.server.util.JsonParser;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -57,14 +59,39 @@ public class McpObjectVOFilter implements ValueFilter {
                 return "null";
             }
 
-            return objectVO.needExpand() ? drawObjectView(innerObject) : objectToString(innerObject);
+            if (objectVO.needExpand()) {
+                // 根据 GlobalOptions.isUsingJson 配置决定输出格式
+                if (GlobalOptions.isUsingJson) {
+                    return drawJsonView(innerObject);
+                } else {
+                    return drawObjectView(objectVO);
+                }
+            } else {
+                return objectToString(innerObject);
+            }
         } catch (Exception e) {
             logger.warn("Failed to handle ObjectVO: {}", e.getMessage());
             return "{\"error\":\"ObjectVO serialization failed\"}";
         }
     }
 
-    private String drawObjectView(Object object) {
+    /**
+     * 使用 ObjectView 输出对象结构
+     */
+    private String drawObjectView(ObjectVO objectVO) {
+        try {
+            ObjectView objectView = new ObjectView(objectVO);
+            return objectView.draw();
+        } catch (Exception e) {
+            logger.debug("ObjectView serialization failed, using toString: {}", e.getMessage());
+            return objectToString(objectVO.getObject());
+        }
+    }
+
+    /**
+     * 使用 JSON 格式输出对象
+     */
+    private String drawJsonView(Object object) {
         try {
             JSONWriter.Context context = JSONFactory.createWriteContext();
             context.setMaxLevel(4097);