diff --git a/src/panels/ICHelperPanel.ts b/src/panels/ICHelperPanel.ts
index 92800d1..c8f2007 100644
--- a/src/panels/ICHelperPanel.ts
+++ b/src/panels/ICHelperPanel.ts
@@ -10,7 +10,6 @@ import {
   handleUserAnswer,
   abortCurrentDialog,
   handlePlanAction,
-  setPendingPlanExecution,
   getCurrentTaskId,
   setLastTaskId,
 } from "../utils/messageHandler";
@@ -282,7 +281,7 @@ export async function showICHelperPanel(
           break;
         // 新增：处理用户回答
         case "submitAnswer":
-          handleUserAnswer(
+          void handleUserAnswer(
             message.askId,
             message.selected,
             message.customInput
@@ -328,27 +327,20 @@ export async function showICHelperPanel(
         // 处理计划操作（只做模式切换，响应已通过 submitAnswer 发送）
         case "planAction":
           if (message.action === "confirm") {
-            // 确认执行：切换到 Agent 模式
+            // 确认执行：切换到 Agent 模式（UI 切换）
             panel.webview.postMessage({
               command: "switchMode",
               mode: "agent",
             });
-            // 获取当前会话的 taskId，用于复用知识图谱数据
-            const taskId = getCurrentTaskId();
-            if (taskId) {
-              // 设置待执行的计划，对话结束后自动执行（复用 taskId）
-              setPendingPlanExecution(
-                panel,
-                message.planTitle || "计划",
-                context.extensionPath,
-                taskId,
-                message.model  // 传递服务等级
-              );
-            } else {
-              console.warn(
-                "[ICHelperPanel] 无法获取当前 taskId，知识图谱数据可能丢失"
-              );
-            }
+            // 注意：不再设置待执行计划；后端 LLM 会在同一对话中自动执行计划
+          } else if (message.action === "modify" || message.action === "cancel") {
+            void handlePlanAction(
+              panel,
+              message.action,
+              message.planTitle || "",
+              context.extensionPath,
+              message.model
+            );
           }
           break;
         // 添加文件上下文 - 显示工作区文件列表
diff --git a/src/services/creditsService.ts b/src/services/creditsService.ts
index d55b7f2..5b55a61 100644
--- a/src/services/creditsService.ts
+++ b/src/services/creditsService.ts
@@ -3,7 +3,11 @@
  * 负责缓存余额、主动查询、发送前检测
  */
 
-import { getCreditBalance } from './apiClient';
+import * as vscode from 'vscode';
+import * as https from 'https';
+import * as http from 'http';
+import { URL } from 'url';
+import { getStrangeLoopApiUrl } from '../config/settings';
 import { getCachedUserInfo } from './userService';
 
 /** 低余额阈值 */
@@ -43,22 +47,41 @@ function isCacheValid(): boolean {
 }
 
 /**
- * 主动查询余额
+ * StrangeLoop 余额响应类型
+ */
+interface StrangeLoopBalanceResponse {
+  userId?: number;
+  availableCredits?: number;
+  totalCredits?: number;
+  error?: string;
+  message?: string;
+}
+
+/**
+ * 主动查询余额（直接调用 StrangeLoop 接口）
  */
 export async function fetchBalance(): Promise<number | null> {
-  const userInfo = getCachedUserInfo();
-  if (!userInfo?.userId) {
-    console.warn('[CreditsService] 无法查询余额：未登录');
-    return null;
-  }
-
   try {
-    const response = await getCreditBalance(userInfo.userId);
-    if (response.success && response.balance !== undefined) {
-      updateCachedBalance(response.balance);
-      return response.balance;
+    // 获取 JWT token
+    const session = await vscode.authentication.getSession('iccoder', [], { silent: true });
+    if (!session?.accessToken) {
+      console.warn('[CreditsService] 无法查询余额：未登录');
+      return null;
+    }
+
+    const token = session.accessToken;
+    console.log('[CreditsService] 开始查询余额，token 长度:', token.length);
+
+    // 直接调用 StrangeLoop 的 /api/credit/balance 接口
+    const response = await callStrangeLoopBalance(token);
+
+    if (response.availableCredits !== undefined) {
+      const balance = response.availableCredits;
+      updateCachedBalance(balance);
+      console.log('[CreditsService] 余额查询成功:', balance);
+      return balance;
     } else {
-      console.warn('[CreditsService] 查询余额失败:', response.error);
+      console.warn('[CreditsService] 查询余额失败:', response.error || response.message);
       return null;
     }
   } catch (error) {
@@ -67,6 +90,72 @@ export async function fetchBalance(): Promise<number | null> {
   }
 }
 
+/**
+ * 调用 StrangeLoop 余额接口
+ */
+async function callStrangeLoopBalance(token: string): Promise<StrangeLoopBalanceResponse> {
+  const urlStr = getStrangeLoopApiUrl('/api/credit/balance');
+  const url = new URL(urlStr);
+
+  const isHttps = url.protocol === 'https:';
+  const httpModule = isHttps ? https : http;
+
+  // 余额查询使用固定短超时，避免阻塞发送前检查
+  const BALANCE_TIMEOUT_MS = 5000;
+
+  const requestOptions: http.RequestOptions = {
+    hostname: url.hostname,
+    port: url.port || (isHttps ? 443 : 80),
+    path: url.pathname + url.search,
+    method: 'GET',
+    headers: {
+      'Content-Type': 'application/json',
+      'Authorization': `Bearer ${token}`
+    },
+    timeout: BALANCE_TIMEOUT_MS
+  };
+
+  return new Promise((resolve, reject) => {
+    const req = httpModule.request(requestOptions, (res) => {
+      let data = '';
+
+      res.on('data', (chunk) => {
+        data += chunk;
+      });
+
+      res.on('end', () => {
+        console.log('[CreditsService] 响应状态码:', res.statusCode);
+        console.log('[CreditsService] 响应内容:', data);
+
+        try {
+          const json = JSON.parse(data);
+          if (res.statusCode && res.statusCode >= 200 && res.statusCode < 300) {
+            resolve(json as StrangeLoopBalanceResponse);
+          } else if (res.statusCode === 401 || res.statusCode === 403) {
+            // 登录过期或无权限
+            resolve({ error: '登录已过期，请重新登录' });
+          } else {
+            resolve({ error: json.error || json.message || json.msg || `HTTP ${res.statusCode}` });
+          }
+        } catch (e) {
+          resolve({ error: `解析响应失败: ${data}` });
+        }
+      });
+    });
+
+    req.on('error', (error) => {
+      reject(error);
+    });
+
+    req.on('timeout', () => {
+      req.destroy();
+      reject(new Error('请求超时'));
+    });
+
+    req.end();
+  });
+}
+
 /**
  * 获取当前余额（优先使用缓存，过期则主动查询）
  */
diff --git a/src/services/dialogService.ts b/src/services/dialogService.ts
index 515fa4b..fab077f 100644
--- a/src/services/dialogService.ts
+++ b/src/services/dialogService.ts
@@ -96,6 +96,7 @@ export class DialogSession {
   private hasCompleted = false;  // 标记是否已收到 complete 事件
   private segments: MessageSegment[] = [];
   private currentTextSegment: MessageSegment | null = null;
+  private completeCallback: ((segments: MessageSegment[]) => void) | null = null;  // 保存完成回调，用于 abort 时触发
 
   constructor(extensionPath: string, existingTaskId?: string) {
     // 支持复用现有 taskId（用于 Plan 模式确认后继续执行）
@@ -337,6 +338,7 @@ export class DialogSession {
     this.accumulatedText = '';
     this.segments = [];
     this.currentTextSegment = null;
+    this.completeCallback = callbacks.onComplete || null;  // 保存完成回调，用于 abort 时触发
 
     const config = getConfig();
 
@@ -458,6 +460,8 @@ export class DialogSession {
         callbacks.onToolComplete?.(data.tool_name, data.result);
         // 实时发送段落更新
         callbacks.onSegmentUpdate?.(this.segments);
+        // 追踪工具执行结果（用于后端重启后恢复）
+        historyManager.trackToolResult(data.tool_name, data.result);
       },
 
       onToolError: (data) => {
@@ -465,6 +469,8 @@ export class DialogSession {
         callbacks.onToolError?.(data.tool_name, data.error);
         // 实时发送段落更新
         callbacks.onSegmentUpdate?.(this.segments);
+        // 追踪工具执行错误（用于后端重启后恢复）
+        historyManager.trackToolResult(data.tool_name, `[错误] ${data.error}`);
       },
 
       onToolConfirm: async (data: ToolConfirmEvent) => {
@@ -842,13 +848,25 @@ export class DialogSession {
    * 中止当前对话
    */
   abort(): void {
+    // 先标记完成，防止 onClose 重复触发
+    const wasActive = this.isActive;
+    this.hasCompleted = true;
+    this.isActive = false;
+
     if (this.sseController) {
       this.sseController.abort();
       this.sseController = null;
     }
-    this.isActive = false;
     userInteractionManager.cancelAll();
 
+    // 如果之前是活跃状态，触发完成回调以结束 Promise
+    if (wasActive && this.completeCallback) {
+      this.finalizeTextSegment();
+      console.log('[DialogSession] abort 触发完成回调');
+      this.completeCallback(this.segments);
+      this.completeCallback = null;
+    }
+
     // 通知后端停止处理
     stopDialog(this.taskId).catch(err => {
       console.warn('[DialogSession] 停止对话请求失败:', err);
diff --git a/src/utils/chatHistoryManager.ts b/src/utils/chatHistoryManager.ts
index 9f702d4..f36ce07 100644
--- a/src/utils/chatHistoryManager.ts
+++ b/src/utils/chatHistoryManager.ts
@@ -715,6 +715,10 @@ export class ChatHistoryManager {
 
     if (!projectPath) {
       console.error('[ChatHistoryManager] 无法保存压缩数据：projectPath 为空');
+      // 通知用户压缩数据保存失败
+      vscode.window.showWarningMessage(
+        '对话历史压缩数据保存失败：无法确定项目路径。后端重启后可能无法恢复完整对话历史。'
+      );
       return;
     }
 
@@ -731,6 +735,19 @@ export class ChatHistoryManager {
       // 文件不存在，使用空数组
     }
 
+    // 版本检查：防止旧版本覆盖新版本（从尾部扫描，与加载逻辑一致）
+    let existingSummary: CompactionSummaryMessage | null = null;
+    for (let i = messages.length - 1; i >= 0; i--) {
+      if (messages[i].type === MessageType.COMPACTION_SUMMARY) {
+        existingSummary = messages[i] as CompactionSummaryMessage;
+        break;
+      }
+    }
+    if (existingSummary && existingSummary.version >= compacted.version) {
+      console.log(`[ChatHistoryManager] 跳过旧版本压缩数据: 现有版本=${existingSummary.version}, 新版本=${compacted.version}`);
+      return;
+    }
+
     // 创建压缩摘要消息
     const summaryMessage: CompactionSummaryMessage = {
       type: MessageType.COMPACTION_SUMMARY,
@@ -893,4 +910,14 @@ export class ChatHistoryManager {
       content: text
     });
   }
+
+  /**
+   * 追踪新消息（工具执行结果）
+   */
+  public trackToolResult(toolName: string, result: string): void {
+    this.newMessagesSinceCompaction.push({
+      type: 'TOOL_RESULT',
+      content: `[${toolName}] ${result}`
+    });
+  }
 }
diff --git a/src/utils/messageHandler.ts b/src/utils/messageHandler.ts
index 2d0c5da..b0ee6b1 100644
--- a/src/utils/messageHandler.ts
+++ b/src/utils/messageHandler.ts
@@ -31,29 +31,6 @@ let currentSession: DialogSession | null = null;
 /** 最后一个活跃的 taskId（用于压缩等操作） */
 let lastTaskId: string | null = null;
 
-/** 待执行的计划（Plan 模式确认后自动执行） */
-let pendingPlanExecution: {
-  panel: vscode.WebviewPanel;
-  planTitle: string;
-  extensionPath: string;
-  taskId: string; // 保存 taskId 以便复用
-  serviceTier?: ServiceTier; // 保存服务等级
-} | null = null;
-
-/**
- * 设置待执行的计划（由 ICHelperPanel 调用）
- */
-export function setPendingPlanExecution(
-  panel: vscode.WebviewPanel,
-  planTitle: string,
-  extensionPath: string,
-  taskId: string,
-  serviceTier?: ServiceTier
-): void {
-  pendingPlanExecution = { panel, planTitle, extensionPath, taskId, serviceTier };
-  console.log("[MessageHandler] 设置待执行计划:", planTitle, "taskId:", taskId, "serviceTier:", serviceTier);
-}
-
 /**
  * 处理用户消息
  */
@@ -159,13 +136,11 @@ async function handleUserMessageWithBackend(
   // 优先使用 reuseTaskId，其次使用 historyManager 的 taskId
   const taskIdToUse = reuseTaskId || historyManager.getCurrentTaskId();
 
-  // 创建或复用会话
-  if (!currentSession || !currentSession.active) {
-    currentSession = dialogManager.createSession(extensionPath, taskIdToUse || undefined);
-    // 保存 taskId 用于后续操作（如压缩）
-    lastTaskId = currentSession.getTaskId();
-    console.log("[MessageHandler] 创建会话: taskId=", lastTaskId, "来源=", taskIdToUse ? "historyManager" : "新生成");
-  }
+  // 创建会话（dialogManager 会自动处理旧会话的中止）
+  currentSession = dialogManager.createSession(extensionPath, taskIdToUse || undefined);
+  // 保存 taskId 用于后续操作（如压缩）
+  lastTaskId = currentSession.getTaskId();
+  console.log("[MessageHandler] 创建会话: taskId=", lastTaskId, "来源=", taskIdToUse ? "historyManager" : "新生成");
 
   // 显示状态栏
   panel.webview.postMessage({
@@ -246,43 +221,6 @@ async function handleUserMessageWithBackend(
             console.warn("保存AI响应历史失败:", error);
           }
 
-          // 检查是否有待执行的计划（Plan 模式确认后自动执行）
-          if (pendingPlanExecution) {
-            const {
-              panel: execPanel,
-              planTitle,
-              extensionPath: execPath,
-              taskId: reuseTaskId,
-              serviceTier: savedServiceTier,
-            } = pendingPlanExecution;
-            pendingPlanExecution = null;
-            console.log(
-              "[MessageHandler] 自动执行计划:",
-              planTitle,
-              "复用 taskId:",
-              reuseTaskId,
-              "serviceTier:",
-              savedServiceTier
-            );
-
-            // 延迟一小段时间确保当前对话完全结束
-            setTimeout(async () => {
-              try {
-                // 复用 taskId 创建新会话，确保知识图谱数据不丢失
-                await handleUserMessageWithBackend(
-                  execPanel,
-                  `请按照刚才的计划执行：${planTitle}`,
-                  execPath,
-                  "agent",
-                  reuseTaskId, // 复用 Plan 模式的 taskId
-                  savedServiceTier // 传递保存的服务等级
-                );
-              } catch (err) {
-                console.error("[MessageHandler] 自动执行计划失败:", err);
-              }
-            }, 500);
-          }
-
           resolve();
         },
 
diff --git a/src/views/conversationHistoryBar.ts b/src/views/conversationHistoryBar.ts
index 1e8cde0..80e5785 100644
--- a/src/views/conversationHistoryBar.ts
+++ b/src/views/conversationHistoryBar.ts
@@ -303,6 +303,7 @@ export function getConversationHistoryBarScript(): string {
     let totalHistory = 0;
     let hasMoreHistory = false;
     let isLoadingHistory = false;
+    let currentLoadRequestId = 0;  // 请求 ID，用于防止并发加载
     const HISTORY_PAGE_SIZE = 10;
     const MAX_HISTORY_ITEMS = 100;
 
@@ -346,11 +347,15 @@ export function getConversationHistoryBarScript(): string {
         return;
       }
 
+      // 生成新的请求 ID，用于防止并发加载
+      const requestId = ++currentLoadRequestId;
+
       isLoadingHistory = true;
       vscode.postMessage({
         command: 'loadConversationHistory',
         offset: currentOffset,
-        limit: HISTORY_PAGE_SIZE
+        limit: HISTORY_PAGE_SIZE,
+        requestId: requestId
       });
     }
 
@@ -362,11 +367,19 @@ export function getConversationHistoryBarScript(): string {
         return;
       }
 
-      // 追加新数据
-      conversationHistory = conversationHistory.concat(data.items);
+      // 追加新数据（去重）
+      const existingIds = new Set(conversationHistory.map(item => item.id));
+      const newItems = [];
+      for (const item of data.items) {
+        if (!existingIds.has(item.id)) {
+          existingIds.add(item.id);
+          newItems.push(item);
+        }
+      }
+      conversationHistory = conversationHistory.concat(newItems);
       totalHistory = data.total;
       hasMoreHistory = data.hasMore;
-      currentOffset += data.items.length;
+      currentOffset = conversationHistory.length;
 
       const historyList = document.getElementById('historyList');
       if (!historyList) {
@@ -454,9 +467,10 @@ export function getConversationHistoryBarScript(): string {
       });
     }
 
-    // 监听下拉菜单滚动事件
+    // 监听下拉菜单滚动事件（防止重复注册）
     const historyDropdownMenu = document.getElementById('historyDropdownMenu');
-    if (historyDropdownMenu) {
+    if (historyDropdownMenu && !historyDropdownMenu._scrollListenerAdded) {
+      historyDropdownMenu._scrollListenerAdded = true;
       historyDropdownMenu.addEventListener('scroll', () => {
         const menu = historyDropdownMenu;
         const scrollTop = menu.scrollTop;