diff --git a/renderer/src/components/main-panel/tool/auto-detector.vue b/renderer/src/components/main-panel/tool/auto-detector.vue
index 26af4b7..1e9f578 100644
--- a/renderer/src/components/main-panel/tool/auto-detector.vue
+++ b/renderer/src/components/main-panel/tool/auto-detector.vue
@@ -12,8 +12,8 @@
         	<Diagram />
 		</el-scrollbar>
         <transition name="main-fade" mode="out-in">
-            <div class="caption" v-show="context.caption.value">
-                {{ context.caption }}
+            <div class="caption" v-show="showCaption">
+                {{ caption }}
             </div>
         </transition>
     </el-dialog>
@@ -23,13 +23,27 @@
 </template>
 
 <script setup lang="ts">
-import { provide, ref } from 'vue';
+import { nextTick, provide, ref } from 'vue';
 import Diagram from './diagram.vue';
 const showDiagram = ref(true);
 
+const caption = ref('');
+const showCaption = ref(false);
+
 const context = {
     reset: () => {},
-    caption: ref('')
+	setCaption: (text: string) => {
+		caption.value = text;
+		if (caption.value) {
+			nextTick(() => {
+				showCaption.value = true;
+			});
+		} else {
+			nextTick(() => {
+				showCaption.value = false;
+			});
+		}
+	}
 };
 
 provide('context', context);
diff --git a/renderer/src/components/main-panel/tool/diagram.ts b/renderer/src/components/main-panel/tool/diagram.ts
new file mode 100644
index 0000000..bcd620f
--- /dev/null
+++ b/renderer/src/components/main-panel/tool/diagram.ts
@@ -0,0 +1,141 @@
+import type { ElkNode } from 'elkjs/lib/elk-api';
+
+export interface Edge {
+	id: string;
+	sources: string[];
+	targets: string[];
+	section?: any; // { startPoint: { x, y }, endPoint: { x, 
+}
+
+export type Node = ElkNode & {
+	[key: string]: any;
+};
+
+export interface DiagramState {
+	nodes: Node[];
+	edges: Edge[];
+	selectedNodeId: string | null;
+	[key: string]: any;
+}
+
+export interface CanConnectResult {
+	canConnect: boolean;
+	reason?: string;
+}
+
+/**
+ * @description 判断两个节点是否可以连接
+ */
+export function invalidConnectionDetector(state: DiagramState, d: Node): CanConnectResult {
+	const from = state.selectedNodeId;
+    const to = d.id;
+
+	if (!from) {
+		return { canConnect: false, reason: '未选择起始节点' };
+	}
+
+	if (from === to) {
+        return { canConnect: false, reason: '不能连接到自身' };
+    }
+
+	// 建立邻接表
+	const adjacencyList: Record<string, Set<string>> = {};
+	state.edges.forEach(edge => {
+		const src = edge.sources[0];
+		const tgt = edge.targets[0];
+		if (!adjacencyList[src]) {
+			adjacencyList[src] = new Set();
+		}
+		adjacencyList[src].add(tgt);
+	});
+	
+	// DFS 检测是否存在
+	function hasPath(current: string, target: string, visited: Set<string>): boolean {
+		if (current === target) return true;
+		visited.add(current);
+		const neighbors = adjacencyList[current] || new Set();
+		for (const neighbor of neighbors) {
+			if (!visited.has(neighbor)) {
+				if (hasPath(neighbor, target, visited)) {
+					return true;
+				}
+			}
+		}
+		return false;
+	}
+
+	if (hasPath(to, from, new Set())) {
+		return { canConnect: false, reason: '连接会形成环路' };
+	}
+	
+	if (hasPath(from, to, new Set())) {
+		return { canConnect: false, reason: '这是一个重复的连接' };
+	}
+
+	return {
+		canConnect: true
+	}
+}
+
+
+// export async function generateAIMockData(params: any) {
+//     if (!currentTool.value?.inputSchema) return;
+//     aiMockLoading.value = true;
+//     try {
+//         const loop = new TaskLoop({ maxEpochs: 1 });
+//         const usePrompt = prompt || `please call the tool ${currentTool.value.name} to make some test`;
+//         const chatStorage = {
+//             messages: [],
+//             settings: {
+//                 temperature: 0.6,
+//                 systemPrompt: '',
+//                 enableTools: [{
+//                     name: currentTool.value.name,
+//                     description: currentTool.value.description,
+//                     inputSchema: currentTool.value.inputSchema,
+//                     enabled: true
+//                 }],
+//                 enableWebSearch: false,
+//                 contextLength: 5,
+//                 enableXmlWrapper: enableXmlWrapper.value,
+//                 parallelToolCalls: false
+//             }
+//         } as ChatStorage;
+
+//         loop.setMaxEpochs(1);
+
+//         let aiMockJson: any = undefined;
+
+//         loop.registerOnToolCall(toolCall => {
+//             console.log(toolCall);
+            
+//             if (toolCall.function?.name === currentTool.value?.name) {
+//                 try {
+//                     const toolArgs = JSON.parse(toolCall.function?.arguments || '{}');
+//                     aiMockJson = toolArgs;
+//                 } catch (e) {
+//                     ElMessage.error('AI 生成的 JSON 解析错误');
+//                 }
+//             } else {
+//                 ElMessage.error('AI 调用了未知的工具');
+//             }
+//             loop.abort();
+//             return toolCall;
+//         });
+
+//         loop.registerOnError(error => {
+//             ElMessage.error(error + '');
+//         });
+
+//         await loop.start(chatStorage, usePrompt);
+
+//         if (aiMockJson && typeof aiMockJson === 'object') {
+//             Object.keys(aiMockJson).forEach(key => {
+//                 tabStorage.formData[key] = aiMockJson[key];
+//             });
+//             formRef.value?.clearValidate?.();
+//         }
+//     } finally {
+//         aiMockLoading.value = false;
+//     }
+// };
\ No newline at end of file
diff --git a/renderer/src/components/main-panel/tool/diagram.vue b/renderer/src/components/main-panel/tool/diagram.vue
index f60a4b7..dbc7554 100644
--- a/renderer/src/components/main-panel/tool/diagram.vue
+++ b/renderer/src/components/main-panel/tool/diagram.vue
@@ -7,17 +7,15 @@
 <script setup lang="ts">
 import { ref, onMounted, nextTick, reactive, inject } from 'vue';
 import * as d3 from 'd3';
-import ELK, { type ElkNode } from 'elkjs/lib/elk.bundled.js';
+import ELK from 'elkjs/lib/elk.bundled.js';
 import { mcpClientAdapter } from '@/views/connect/core';
+import { invalidConnectionDetector, type Edge, type Node } from './diagram';
+import { ElMessage } from 'element-plus';
 
 const svgContainer = ref<HTMLDivElement | null>(null);
 let prevNodes: any[] = [];
 let prevEdges: any[] = [];
 
-type Node = ElkNode & {
-    [key: string]: any;
-};
-
 const state = reactive({
     nodes: [] as any[],
     edges: [] as any[],
@@ -63,16 +61,11 @@ const recomputeLayout = async () => {
 
 const drawDiagram = async () => {
     const tools = await getAllTools();
-    
-    state.nodes = tools.map((tool, i) => ({
-        id: tool.name,
-        width: 160,
-        height: 48,
-        labels: [{ text: tool.name || 'Tool' }]
-    }));
 
     // 默认按照链表进行串联
-    const edges = [];
+    const nodes = [] as Node[];
+    const edges = [] as Edge[];
+
     for (let i = 0; i < tools.length - 1; ++ i) {
         const prev = tools[i];
         const next = tools[i + 1];
@@ -83,7 +76,17 @@ const drawDiagram = async () => {
         })
     }
 
+	for (const tool of tools) {
+		nodes.push({
+			id: tool.name,
+			width: 160,
+			height: 48,
+			labels: [{ text: tool.name || 'Tool' }]
+		});
+	}
+
     state.edges = edges;
+	state.nodes = nodes;
 
     // 重新计算布局
     await recomputeLayout();
@@ -96,7 +99,14 @@ function renderSvg() {
     const prevNodeMap = new Map(prevNodes.map(n => [n.id, n]));
     const prevEdgeMap = new Map(prevEdges.map(e => [e.id, e]));
 
-    const width = Math.max(...state.nodes.map(n => (n.x || 0) + (n.width || 160)), 400) + 60;
+    // 计算所有节点的最小x和最大x
+    const xs = state.nodes.map(n => (n.x || 0));
+    const minX = Math.min(...xs);
+    const maxX = Math.max(...xs.map((x, i) => x + (state.nodes[i].width || 160)));
+    const contentWidth = maxX - minX;
+    const svgWidth = Math.max(contentWidth + 120, 400); // 120为两侧留白
+    const offsetX = (svgWidth - contentWidth) / 2 - minX;	
+
     const height = Math.max(...state.nodes.map(n => (n.y || 0) + (n.height || 48)), 300) + 60;
 
     // 不再全量清空，只清空 svg 元素
@@ -105,11 +115,11 @@ function renderSvg() {
         svg = d3
             .select(svgContainer.value)
             .append('svg')
-            .attr('width', width)
+            .attr('width', svgWidth)
             .attr('height', height)
             .style('user-select', 'none') as any;
     } else {
-        svg.attr('width', width).attr('height', height);
+        svg.attr('width', svgWidth).attr('height', height);
         svg.selectAll('defs').remove();
     }
 
@@ -128,6 +138,16 @@ function renderSvg() {
         .attr('d', 'M 0 0 L 8 4 L 0 8 z')
         .attr('fill', 'var(--main-color)');
 
+    // 1. 创建/获取 main group
+    let mainGroup = svg.select('g.main-group');
+    if (mainGroup.empty()) {
+        mainGroup = svg.append('g').attr('class', 'main-group') as any;
+    }
+    mainGroup
+		.transition()
+		.duration(600)
+		.attr('transform', `translate(${offsetX}, 0)`);
+
     // Draw edges with enter animation
     const allSections: { id: string, section: any }[] = [];
     (state.edges || []).forEach(edge => {
@@ -140,7 +160,7 @@ function renderSvg() {
         });
     });
 
-    const edgeSelection = svg.selectAll<SVGLineElement, any>('.edge')
+    const edgeSelection = mainGroup.selectAll<SVGLineElement, any>('.edge')
         .data(allSections, d => d.id);
 
     edgeSelection.exit().remove();
@@ -198,7 +218,7 @@ function renderSvg() {
         .attr('opacity', 1);
 
     // --- 节点动画部分 ---
-    const nodeGroup = svg.selectAll<SVGGElement, any>('.node')
+    const nodeGroup = mainGroup.selectAll<SVGGElement, any>('.node')
         .data(state.nodes, d => d.id);
 
     nodeGroup.exit().remove();
@@ -219,16 +239,18 @@ function renderSvg() {
         .on('mousedown', null)
         .on('mouseup', function (event, d) {
             event.stopPropagation();
-            if (state.selectedNodeId && state.selectedNodeId !== d.id) {
-                // 检查是否已存在这条连线
-                const exists = state.edges.some(
-                    e =>
-                        Array.isArray(e.sources) &&
-                        Array.isArray(e.targets) &&
-                        e.sources[0] === state.selectedNodeId &&
-                        e.targets[0] === d.id
-                );
-                if (!exists) {
+            if (state.selectedNodeId) {
+				
+				const { canConnect, reason } = invalidConnectionDetector(state, d);
+
+				console.log(reason);
+				
+
+				if (reason) {
+					ElMessage.warning(reason);
+				}
+
+                if (canConnect) {
                     state.edges.push({
                         id: `e${state.selectedNodeId}_${d.id}_${Date.now()}`,
                         sources: [state.selectedNodeId],
@@ -241,12 +263,12 @@ function renderSvg() {
                     state.selectedNodeId = null;
                     renderSvg();
                 }
-                context.caption.value = '';
+                context.setCaption('');
 
             } else {
                 state.selectedNodeId = d.id;
                 renderSvg();
-                context.caption.value = '选择另一个节点以构建顺序';
+                context.setCaption('选择另一个节点以定义测试拓扑');
             }
             state.draggingNodeId = null;
         })
@@ -315,7 +337,7 @@ function renderSvg() {
                 .attr('stroke', 'var(--main-color)')
                 .attr('stroke-width', 4.5);
 
-            context.caption.value = '点击边以删除';
+            context.setCaption('点击边以删除');
             
         })
         .on('mouseout', function () {
@@ -325,8 +347,7 @@ function renderSvg() {
                 .attr('stroke', 'var(--main-color)')
                 .attr('stroke-width', 2.5);
         
-            context.caption.value = '';
-        
+            context.setCaption('');
         })
         .on('click', function (event, d) {
             // 只删除当前 edge
diff --git a/renderer/src/components/main-panel/tool/tool-executor.vue b/renderer/src/components/main-panel/tool/tool-executor.vue
index d121ae8..58cdb8d 100644
--- a/renderer/src/components/main-panel/tool/tool-executor.vue
+++ b/renderer/src/components/main-panel/tool/tool-executor.vue
@@ -233,6 +233,7 @@ const generateAIMockData = async (prompt?: string) => {
         aiMockLoading.value = false;
     }
 };
+
 const generateMockData = async () => {
     if (!currentTool.value?.inputSchema) return;
     mockLoading.value = true;