diff --git a/package.json b/package.json
index 7c3272eeb..fda5a1518 100644
--- a/package.json
+++ b/package.json
@@ -117,7 +117,7 @@
     "babel-plugin-prismjs": "^2.1.0",
     "chai": "^4.1.2",
     "electron": "^22.0.0",
-    "electron-devtools-installer": "^3.2.0",
+    "electron-devtools-installer": "^3.1.1",
     "eslint": "6.5.1",
     "eslint-config-prettier": "^6.11.0",
     "eslint-plugin-prettier": "^3.1.4",
diff --git a/src/background.ts b/src/background.ts
index 0ef172ecf..78ffbab16 100644
--- a/src/background.ts
+++ b/src/background.ts
@@ -2,7 +2,6 @@ import 'reflect-metadata' // Required by TypoORM.
 ;('use strict')
 import { app, protocol, BrowserWindow, ipcMain, shell, Menu } from 'electron'
 import { createProtocol } from 'vue-cli-plugin-electron-builder/lib'
-import installExtension, { VUEJS_DEVTOOLS } from 'electron-devtools-installer'
 import { quitAndRenameLogger } from './utils/logger'
 import { defaultWindowSize, restoreWindowState, saveWindowState } from './utils/windowStateManager'
 import rebuildDatabase from './database/rebuildDatabase'
@@ -43,6 +42,9 @@ protocol.registerSchemesAsPrivileged([{ scheme: 'app', privileges: { secure: tru
 
 const { ConnectionInit, ConnectionDestroy } = useConnection()
 
+// Flag to track if connections have been destroyed
+let connectionsDestroyed = false
+
 function handleIpcMessages() {
   ipcMain.on('setting', (event: Electron.IpcMainEvent, ...args: any[]) => {
     event.sender.send('setting', ...args)
@@ -120,10 +122,16 @@ function handleIpcMessages() {
 function beforeAppQuit() {
   // close all log appender and rename log file with date
   quitAndRenameLogger()
-  // close all SQLite connection
-  ConnectionDestroy()
+
+  // close all SQLite connection - only if not already destroyed
+  if (!connectionsDestroyed) {
+    connectionsDestroyed = true
+    ConnectionDestroy()
+  }
+
   // cleanup MCP connections
   cleanupMCPConnections()
+
   // quit APP
   app.quit()
 }
@@ -246,10 +254,12 @@ async function createWindow() {
 // initialization and is ready to create browser windows.
 // Some APIs can only be used after this event occurs.
 app.on('ready', async () => {
+  // Install Vue Devtools on development mode
   if (isDevelopment && !process.env.IS_TEST) {
-    // Install Vue Devtools
     try {
-      await installExtension(VUEJS_DEVTOOLS)
+      const installExtension = require('electron-devtools-installer').default
+      await installExtension('iaajmlceplecbljialhhkmedjlpdblhp')
+      console.log('Vue Devtools installed successfully')
     } catch (e) {
       console.error('Vue Devtools failed to install:', e)
     }
diff --git a/src/components/ai/Copilot.vue b/src/components/ai/Copilot.vue
index b4670a7af..1285283dc 100644
--- a/src/components/ai/Copilot.vue
+++ b/src/components/ai/Copilot.vue
@@ -205,6 +205,7 @@ export default class Copilot extends Vue {
     const throttledScroll = throttle(() => this.scrollToBottom(), 100)
 
     this.abortController = new AbortController()
+    this.$log.info(`[Copilot] AI response stream started with provider: "${this.model}" from "${this.openAIAPIHost}"`)
     const { textStream } = streamText({
       model: getModelProvider({
         model: this.model,
@@ -226,8 +227,6 @@ export default class Copilot extends Vue {
     if (this.shouldProcessMCP) {
       const processedContent = await processMCPCalls(this.responseStreamText)
       responseMessage.content = processedContent
-      // AI TOOL CALL RESULT
-      console.log(processedContent)
     } else {
       responseMessage.content = this.responseStreamText
     }
@@ -372,7 +371,7 @@ export default class Copilot extends Vue {
   }
   @keyframes rightbarPop {
     from {
-      right: -45%;
+      right: -50%;
     }
     to {
       right: 0px;
@@ -382,7 +381,7 @@ export default class Copilot extends Vue {
     box-shadow: -2px 0px 8px 0px var(--color-shadow-leftlist);
     position: fixed;
     right: 0px;
-    width: 45%;
+    width: 50%;
     background: var(--color-bg-normal);
     border-radius: 0;
     top: 0;
diff --git a/src/database/useConnection.ts b/src/database/useConnection.ts
index a2d00a26c..5a43a2260 100644
--- a/src/database/useConnection.ts
+++ b/src/database/useConnection.ts
@@ -20,7 +20,16 @@ const useConnection = () => {
   }
   async function ConnectionDestroy() {
     if (sqlConnection) {
-      await sqlConnection.close()
+      try {
+        if (sqlConnection.isConnected) {
+          await sqlConnection.close()
+        }
+      } catch (error) {
+        console.error('[Database] Error closing database connection:', error)
+        // Gracefully handle errors during connection close
+      } finally {
+        sqlConnection = undefined
+      }
     }
   }
   return {
diff --git a/src/main/ai/mcp/MCPManager.ts b/src/main/ai/mcp/MCPManager.ts
index 1cf7d5407..f4567f86d 100644
--- a/src/main/ai/mcp/MCPManager.ts
+++ b/src/main/ai/mcp/MCPManager.ts
@@ -18,7 +18,7 @@ const activeClients: Map<string, MCPClient> = new Map()
 export function initMCPHandlers(): void {
   // Test connection to a server
   ipcMain.handle('mcp:test-connection', async (_, serverConfig: MCPServer, serverName: string) => {
-    console.log(`Testing connection to MCP server: ${serverName}`)
+    console.log(`[MCP] Testing connection to MCP server: ${serverName}`)
     try {
       const client = new MCPClient()
       const connected = await client.connectToServer(serverConfig)
@@ -60,16 +60,16 @@ export function initMCPHandlers(): void {
 
   // Call a tool on a specific server
   ipcMain.handle('mcp:call-tool', async (_, serverName: string, toolName: string, toolArgs: any) => {
-    console.log(`Calling tool ${toolName} on server ${serverName}`)
+    console.log(`[MCP] Calling tool ${toolName} on server ${serverName}`)
 
     try {
       const client = activeClients.get(serverName)
       if (!client) {
-        // 如果服务器未连接，尝试自动连接
+        // If server is not connected, try to auto-connect
         await autoConnectToServer(serverName)
         const reconnectedClient = activeClients.get(serverName)
         if (!reconnectedClient) {
-          throw new Error(`No active connection to server: ${serverName} and auto-reconnect failed`)
+          throw new Error(`[MCP] No active connection to server: ${serverName} and auto-reconnect failed`)
         }
 
         const result = await reconnectedClient.callTool(toolName, toolArgs)
@@ -80,7 +80,7 @@ export function initMCPHandlers(): void {
       }
 
       if (!client.isConnected()) {
-        throw new Error(`Connection to server ${serverName} has been lost`)
+        throw new Error(`[MCP] Connection to server ${serverName} has been lost`)
       }
 
       const result = await client.callTool(toolName, toolArgs)
@@ -89,7 +89,7 @@ export function initMCPHandlers(): void {
         result,
       }
     } catch (error) {
-      console.error(`Error calling tool ${toolName} on server ${serverName}:`, error)
+      console.error(`[MCP] Error calling tool ${toolName} on server ${serverName}:`, error)
       return {
         success: false,
         message: error instanceof Error ? error.message : String(error),
@@ -99,7 +99,7 @@ export function initMCPHandlers(): void {
 
   // Disconnect from a server
   ipcMain.handle('mcp:disconnect', async (_, serverName: string) => {
-    console.log(`Disconnecting from MCP server: ${serverName}`)
+    console.log(`[MCP] Disconnecting from MCP server: ${serverName}`)
 
     try {
       const client = activeClients.get(serverName)
@@ -116,7 +116,7 @@ export function initMCPHandlers(): void {
         message: `No active connection to server: ${serverName}`,
       }
     } catch (error) {
-      console.error(`Error disconnecting from MCP server: ${serverName}`, error)
+      console.error(`[MCP] Error disconnecting from MCP server: ${serverName}`, error)
       return {
         success: false,
         message: error instanceof Error ? error.message : String(error),
@@ -124,32 +124,32 @@ export function initMCPHandlers(): void {
     }
   })
 
-  // 自动连接已启用的 MCP 服务器
+  // Auto-connect to enabled MCP servers
   autoConnectToEnabledServers()
 }
 
 /**
- * 自动连接到启用的 MCP 服务器
+ * Automatically connect to enabled MCP servers
  */
 async function autoConnectToEnabledServers(): Promise<void> {
-  console.log('Checking for enabled MCP servers to auto-connect')
+  console.log('[MCP] Checking for enabled MCP servers to auto-connect')
 
   try {
-    // 从本地存储中读取 MCP 配置
+    // Read MCP configuration from local storage
     const Store = require('electron-store')
     const store = new Store()
 
-    // 检查 MCP 是否启用
+    // Check if MCP is enabled
     const mcpEnabled = store.get('mcpEnabled')
     if (mcpEnabled !== 'true') {
-      console.log('MCP is not enabled, skipping auto-connect')
+      console.log('[MCP] MCP is not enabled, skipping auto-connect')
       return
     }
 
-    // 获取 MCP 配置
+    // Get MCP configuration
     const mcpConfigStr = store.get('mcpConfig')
     if (!mcpConfigStr) {
-      console.log('No MCP configuration found, skipping auto-connect')
+      console.log('[MCP] No MCP configuration found, skipping auto-connect')
       return
     }
 
@@ -157,16 +157,16 @@ async function autoConnectToEnabledServers(): Promise<void> {
     try {
       mcpConfig = JSON.parse(mcpConfigStr)
     } catch (err) {
-      console.error('Failed to parse MCP configuration:', err)
+      console.error('[MCP] Failed to parse MCP configuration:', err)
       return
     }
 
     if (!mcpConfig.mcpServers) {
-      console.log('No MCP servers configured, skipping auto-connect')
+      console.log('[MCP] No MCP servers configured, skipping auto-connect')
       return
     }
 
-    // 连接所有启用的服务器
+    // Connect to all enabled servers
     for (const [serverName, serverConfig] of Object.entries(mcpConfig.mcpServers)) {
       const serverEnabled = store.get(`mcpServerEnabled:${serverName}`)
       if (serverEnabled === 'true') {
@@ -174,23 +174,23 @@ async function autoConnectToEnabledServers(): Promise<void> {
       }
     }
 
-    console.log(`Auto-connected to ${activeClients.size} MCP servers`)
+    console.log(`[MCP] Auto-connected to ${activeClients.size} MCP servers`)
   } catch (error) {
-    console.error('Error during MCP auto-connect:', error)
+    console.error('[MCP] Error during MCP auto-connect:', error)
   }
 }
 
 /**
- * 自动连接到指定的 MCP 服务器
+ * Automatically connect to a specific MCP server
  *
- * @param serverName 服务器名称
- * @param serverConfig 服务器配置（可选）
+ * @param serverName Server name
+ * @param serverConfig Server configuration (optional)
  */
 async function autoConnectToServer(serverName: string, serverConfig?: MCPServer): Promise<boolean> {
-  console.log(`Auto-connecting to MCP server: ${serverName}`)
+  console.log(`[MCP] Auto-connecting to MCP server: ${serverName}`)
 
   try {
-    // 如果没有提供服务器配置，从存储中获取
+    // If server configuration is not provided, get it from storage
     if (!serverConfig) {
       const Store = require('electron-store')
       const store = new Store()
@@ -205,35 +205,35 @@ async function autoConnectToServer(serverName: string, serverConfig?: MCPServer)
         serverConfig = mcpConfig.mcpServers[serverName] as MCPServer
 
         if (!serverConfig) {
-          console.error(`Server configuration for ${serverName} not found`)
+          console.error(`[MCP] Server configuration for ${serverName} not found`)
           return false
         }
       } catch (err) {
-        console.error('Failed to parse MCP configuration:', err)
+        console.error('[MCP] Failed to parse MCP configuration:', err)
         return false
       }
     }
 
-    // 检查是否已经有连接
+    // Check if connection already exists
     if (activeClients.has(serverName)) {
       const existingClient = activeClients.get(serverName)
       if (existingClient && existingClient.isConnected()) {
-        console.log(`Server ${serverName} is already connected`)
+        console.log(`[MCP] Server ${serverName} is already connected`)
         return true
       }
 
-      // 如果存在但断开连接，先清理
+      // If exists but disconnected, clean up first
       if (existingClient) {
         try {
           await existingClient.disconnect()
         } catch (err) {
-          console.error(`Error disconnecting existing client for ${serverName}:`, err)
+          console.error(`[MCP] Error disconnecting existing client for ${serverName}:`, err)
         }
         activeClients.delete(serverName)
       }
     }
 
-    // 创建并连接新客户端
+    // Create and connect new client
     const client = new MCPClient()
     const connected = await client.connectToServer(serverConfig)
 
@@ -245,11 +245,11 @@ async function autoConnectToServer(serverName: string, serverConfig?: MCPServer)
       activeClients.set(serverName, client)
       return true
     } else {
-      console.error(`Failed to connect to MCP server: ${serverName}`)
+      console.error(`[MCP] Failed to connect to MCP server: ${serverName}`)
       return false
     }
   } catch (error) {
-    console.error(`Error auto-connecting to MCP server ${serverName}:`, error)
+    console.error(`[MCP] Error auto-connecting to MCP server ${serverName}:`, error)
     return false
   }
 }
@@ -258,14 +258,14 @@ async function autoConnectToServer(serverName: string, serverConfig?: MCPServer)
  * Clean up all active connections
  */
 export async function cleanupMCPConnections(): Promise<void> {
-  console.log(`Cleaning up ${activeClients.size} MCP connections`)
+  console.log(`[MCP] Cleaning up ${activeClients.size} MCP connections`)
 
   for (const [name, client] of activeClients.entries()) {
     try {
       await client.disconnect()
-      console.log(`Disconnected from MCP server: ${name}`)
+      console.log(`[MCP] Disconnected from MCP server: ${name}`)
     } catch (error) {
-      console.error(`Error disconnecting from MCP server: ${name}`, error)
+      console.error(`[MCP] Error disconnecting from MCP server: ${name}`, error)
     }
   }
 
diff --git a/yarn.lock b/yarn.lock
index 7ec834f45..5695ad33f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5282,10 +5282,10 @@ electron-builder@23.6.0, electron-builder@^22.2.0:
     simple-update-notifier "^1.0.7"
     yargs "^17.5.1"
 
-electron-devtools-installer@^3.2.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/electron-devtools-installer/-/electron-devtools-installer-3.2.0.tgz#acc48d24eb7033fe5af284a19667e73b78d406d0"
-  integrity sha512-t3UczsYugm4OAbqvdImMCImIMVdFzJAHgbwHpkl5jmfu1izVgUcP/mnrPqJIpEeCK1uZGpt+yHgWEN+9EwoYhQ==
+electron-devtools-installer@^3.1.1:
+  version "3.2.1"
+  resolved "https://registry.yarnpkg.com/electron-devtools-installer/-/electron-devtools-installer-3.2.1.tgz#338a0ada7b4232ee42cd88fe5cf305c6be95cfe9"
+  integrity sha512-FaCi+oDCOBTw0gJUsuw5dXW32b2Ekh5jO8lI1NRCQigo3azh2VogsIi0eelMVrP1+LkN/bewyH3Xoo1USjO0eQ==
   dependencies:
     rimraf "^3.0.2"
     semver "^7.2.1"