diff --git a/src/components/AppSwitcher.tsx b/src/components/AppSwitcher.tsx
index c09cc46..5c21cd5 100644
--- a/src/components/AppSwitcher.tsx
+++ b/src/components/AppSwitcher.tsx
@@ -26,8 +26,8 @@ export function AppSwitcher({ activeApp, onSwitch }: AppSwitcherProps) {
         <ClaudeIcon
           size={16}
           className={
-            activeApp === "claude" 
-              ? "text-[#D97757] dark:text-[#D97757] transition-colors duration-200" 
+            activeApp === "claude"
+              ? "text-[#D97757] dark:text-[#D97757] transition-colors duration-200"
               : "text-gray-500 dark:text-gray-400 group-hover:text-[#D97757] dark:group-hover:text-[#D97757] transition-colors duration-200"
           }
         />
diff --git a/src/components/JsonEditor.tsx b/src/components/JsonEditor.tsx
index bdd1c16..65868e3 100644
--- a/src/components/JsonEditor.tsx
+++ b/src/components/JsonEditor.tsx
@@ -62,7 +62,7 @@ const JsonEditor: React.FC<JsonEditorProps> = ({
 
         return diagnostics;
       }),
-    [showValidation]
+    [showValidation],
   );
 
   useEffect(() => {
diff --git a/src/components/ProviderForm.tsx b/src/components/ProviderForm.tsx
index ed04869..9045e78 100644
--- a/src/components/ProviderForm.tsx
+++ b/src/components/ProviderForm.tsx
@@ -128,25 +128,26 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
   const [settingsConfigError, setSettingsConfigError] = useState("");
   // 用于跟踪是否正在通过通用配置更新
   const isUpdatingFromCommonConfig = useRef(false);
-  
+
   // Codex 通用配置状态
   const [useCodexCommonConfig, setUseCodexCommonConfig] = useState(false);
-  const [codexCommonConfigSnippet, setCodexCommonConfigSnippetState] = useState<string>(() => {
-    if (typeof window === "undefined") {
-      return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
-    }
-    try {
-      const stored = window.localStorage.getItem(
-        CODEX_COMMON_CONFIG_STORAGE_KEY,
-      );
-      if (stored && stored.trim()) {
-        return stored;
+  const [codexCommonConfigSnippet, setCodexCommonConfigSnippetState] =
+    useState<string>(() => {
+      if (typeof window === "undefined") {
+        return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
       }
-    } catch {
-      // ignore localStorage 读取失败
-    }
-    return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
-  });
+      try {
+        const stored = window.localStorage.getItem(
+          CODEX_COMMON_CONFIG_STORAGE_KEY,
+        );
+        if (stored && stored.trim()) {
+          return stored;
+        }
+      } catch {
+        // ignore localStorage 读取失败
+      }
+      return DEFAULT_CODEX_COMMON_CONFIG_SNIPPET;
+    });
   const [codexCommonConfigError, setCodexCommonConfigError] = useState("");
   const isUpdatingFromCodexCommonConfig = useRef(false);
   // -1 表示自定义，null 表示未选择，>= 0 表示预设索引
@@ -217,7 +218,11 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
   useEffect(() => {
     if (initialData) {
       if (!isCodex) {
-        const configString = JSON.stringify(initialData.settingsConfig, null, 2);
+        const configString = JSON.stringify(
+          initialData.settingsConfig,
+          null,
+          2,
+        );
         const hasCommon = hasCommonConfigSnippet(
           configString,
           commonConfigSnippet,
@@ -235,7 +240,9 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
           };
           if (config.env) {
             setClaudeModel(config.env.ANTHROPIC_MODEL || "");
-            setClaudeSmallFastModel(config.env.ANTHROPIC_SMALL_FAST_MODEL || "");
+            setClaudeSmallFastModel(
+              config.env.ANTHROPIC_SMALL_FAST_MODEL || "",
+            );
             setBaseUrl(config.env.ANTHROPIC_BASE_URL || ""); // 初始化基础 URL
 
             // 初始化 Kimi 模型选择
@@ -254,7 +261,13 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
         setUseCodexCommonConfig(hasCommon);
       }
     }
-  }, [initialData, commonConfigSnippet, codexCommonConfigSnippet, isCodex, codexConfig]);
+  }, [
+    initialData,
+    commonConfigSnippet,
+    codexCommonConfigSnippet,
+    isCodex,
+    codexConfig,
+  ]);
 
   // 当选择预设变化时，同步类别
   useEffect(() => {
@@ -497,7 +510,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
         isUpdatingFromCommonConfig.current = false;
       }, 0);
     }
-    
+
     // 保存通用配置到 localStorage
     if (!validationError && typeof window !== "undefined") {
       try {
@@ -529,10 +542,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
     setBaseUrl(""); // 清空基础 URL
 
     // 同步通用配置状态
-    const hasCommon = hasCommonConfigSnippet(
-      configString,
-      commonConfigSnippet,
-    );
+    const hasCommon = hasCommonConfigSnippet(configString, commonConfigSnippet);
     setUseCommonConfig(hasCommon);
     setCommonConfigError("");
 
@@ -643,10 +653,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
     updateSettingsConfigValue(configString);
 
     // 同步通用配置开关
-    const hasCommon = hasCommonConfigSnippet(
-      configString,
-      commonConfigSnippet,
-    );
+    const hasCommon = hasCommonConfigSnippet(configString, commonConfigSnippet);
     setUseCommonConfig(hasCommon);
   };
 
@@ -681,11 +688,12 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
 
   // Codex: 处理通用配置开关
   const handleCodexCommonConfigToggle = (checked: boolean) => {
-    const { updatedConfig, error: snippetError } = updateTomlCommonConfigSnippet(
-      codexConfig,
-      codexCommonConfigSnippet,
-      checked,
-    );
+    const { updatedConfig, error: snippetError } =
+      updateTomlCommonConfigSnippet(
+        codexConfig,
+        codexCommonConfigSnippet,
+        checked,
+      );
 
     if (snippetError) {
       setCodexCommonConfigError(snippetError);
@@ -753,10 +761,7 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
     // 保存 Codex 通用配置到 localStorage
     if (typeof window !== "undefined") {
       try {
-        window.localStorage.setItem(
-          CODEX_COMMON_CONFIG_STORAGE_KEY,
-          value,
-        );
+        window.localStorage.setItem(CODEX_COMMON_CONFIG_STORAGE_KEY, value);
       } catch {
         // ignore localStorage 写入失败
       }
@@ -1177,7 +1182,9 @@ const ProviderForm: React.FC<ProviderFormProps> = ({
                 useCommonConfig={useCodexCommonConfig}
                 onCommonConfigToggle={handleCodexCommonConfigToggle}
                 commonConfigSnippet={codexCommonConfigSnippet}
-                onCommonConfigSnippetChange={handleCodexCommonConfigSnippetChange}
+                onCommonConfigSnippetChange={
+                  handleCodexCommonConfigSnippetChange
+                }
                 commonConfigError={codexCommonConfigError}
                 authError={codexAuthError}
               />
diff --git a/src/components/ProviderForm/ClaudeConfigEditor.tsx b/src/components/ProviderForm/ClaudeConfigEditor.tsx
index 2b75e6d..03aa98b 100644
--- a/src/components/ProviderForm/ClaudeConfigEditor.tsx
+++ b/src/components/ProviderForm/ClaudeConfigEditor.tsx
@@ -60,7 +60,7 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
   // 支持按下 ESC 关闭弹窗
   useEffect(() => {
     if (!isCommonConfigModalOpen) return;
-    
+
     const onKeyDown = (e: KeyboardEvent) => {
       if (e.key === "Escape") {
         e.preventDefault();
@@ -120,15 +120,13 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
         rows={12}
       />
       {configError && (
-        <p className="text-xs text-red-500 dark:text-red-400">
-          {configError}
-        </p>
+        <p className="text-xs text-red-500 dark:text-red-400">{configError}</p>
       )}
       <p className="text-xs text-gray-500 dark:text-gray-400">
         完整的 Claude Code settings.json 配置内容
       </p>
       {isCommonConfigModalOpen && (
-        <div 
+        <div
           className="fixed inset-0 z-50 flex items-center justify-center"
           onMouseDown={(e) => {
             if (e.target === e.currentTarget) closeModal();
@@ -136,7 +134,7 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
         >
           {/* Backdrop - 统一背景样式 */}
           <div className="absolute inset-0 bg-black/50 dark:bg-black/70 backdrop-blur-sm" />
-          
+
           {/* Modal - 统一窗口样式 */}
           <div className="relative bg-white dark:bg-gray-900 rounded-xl shadow-lg max-w-2xl w-full mx-4 max-h-[90vh] overflow-hidden flex flex-col">
             {/* Header - 统一标题栏样式 */}
@@ -153,7 +151,7 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
                 <X size={18} />
               </button>
             </div>
-            
+
             {/* Content - 统一内容区域样式 */}
             <div className="flex-1 overflow-auto p-6 space-y-4">
               <p className="text-sm text-gray-500 dark:text-gray-400">
@@ -171,7 +169,7 @@ const ClaudeConfigEditor: React.FC<ClaudeConfigEditorProps> = ({
                 </p>
               )}
             </div>
-            
+
             {/* Footer - 统一底部按钮样式 */}
             <div className="flex items-center justify-end gap-3 p-6 border-t border-gray-200 dark:border-gray-800 bg-gray-100 dark:bg-gray-800">
               <button
diff --git a/src/components/ProviderForm/CodexConfigEditor.tsx b/src/components/ProviderForm/CodexConfigEditor.tsx
index ebd6eee..69b0ed9 100644
--- a/src/components/ProviderForm/CodexConfigEditor.tsx
+++ b/src/components/ProviderForm/CodexConfigEditor.tsx
@@ -39,7 +39,7 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
   // 支持按下 ESC 关闭弹窗
   useEffect(() => {
     if (!isCommonConfigModalOpen) return;
-    
+
     const onKeyDown = (e: KeyboardEvent) => {
       if (e.key === "Escape") {
         e.preventDefault();
@@ -97,9 +97,7 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
           data-enable-grammarly="false"
         />
         {authError && (
-          <p className="text-xs text-red-500 dark:text-red-400">
-            {authError}
-          </p>
+          <p className="text-xs text-red-500 dark:text-red-400">{authError}</p>
         )}
         <p className="text-xs text-gray-500 dark:text-gray-400">
           Codex auth.json 配置内容
@@ -161,7 +159,7 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
       </div>
 
       {isCommonConfigModalOpen && (
-        <div 
+        <div
           className="fixed inset-0 z-50 flex items-center justify-center"
           onMouseDown={(e) => {
             if (e.target === e.currentTarget) closeModal();
@@ -169,7 +167,7 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
         >
           {/* Backdrop - 统一背景样式 */}
           <div className="absolute inset-0 bg-black/50 dark:bg-black/70 backdrop-blur-sm" />
-          
+
           {/* Modal - 统一窗口样式 */}
           <div className="relative bg-white dark:bg-gray-900 rounded-xl shadow-lg max-w-2xl w-full mx-4 max-h-[90vh] overflow-hidden flex flex-col">
             {/* Header - 统一标题栏样式 */}
@@ -186,7 +184,7 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
                 <X size={18} />
               </button>
             </div>
-            
+
             {/* Content - 统一内容区域样式 */}
             <div className="flex-1 overflow-auto p-6 space-y-4">
               <p className="text-sm text-gray-500 dark:text-gray-400">
@@ -194,7 +192,9 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
               </p>
               <textarea
                 value={commonConfigSnippet}
-                onChange={(e) => handleCommonConfigSnippetChange(e.target.value)}
+                onChange={(e) =>
+                  handleCommonConfigSnippetChange(e.target.value)
+                }
                 placeholder={`# Common Codex config
 # Add your common TOML configuration here`}
                 rows={12}
@@ -215,7 +215,7 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
                 </p>
               )}
             </div>
-            
+
             {/* Footer - 统一底部按钮样式 */}
             <div className="flex items-center justify-end gap-3 p-6 border-t border-gray-200 dark:border-gray-800 bg-gray-100 dark:bg-gray-800">
               <button
diff --git a/src/utils/errorUtils.ts b/src/utils/errorUtils.ts
index 9938952..43cb23c 100644
--- a/src/utils/errorUtils.ts
+++ b/src/utils/errorUtils.ts
@@ -35,4 +35,4 @@ export const extractErrorMessage = (error: unknown): string => {
   }
 
   return "";
-};
\ No newline at end of file
+};
diff --git a/src/utils/providerConfigUtils.ts b/src/utils/providerConfigUtils.ts
index aa5e284..930969f 100644
--- a/src/utils/providerConfigUtils.ts
+++ b/src/utils/providerConfigUtils.ts
@@ -22,7 +22,10 @@ const deepMerge = (
   return target;
 };
 
-const deepRemove = (target: Record<string, any>, source: Record<string, any>) => {
+const deepRemove = (
+  target: Record<string, any>,
+  source: Record<string, any>,
+) => {
   Object.entries(source).forEach(([key, value]) => {
     if (!(key in target)) return;
 
@@ -59,7 +62,7 @@ const isSubset = (target: any, source: any): boolean => {
 const deepClone = <T>(obj: T): T => {
   if (obj === null || typeof obj !== "object") return obj;
   if (obj instanceof Date) return new Date(obj.getTime()) as T;
-  if (obj instanceof Array) return obj.map(item => deepClone(item)) as T;
+  if (obj instanceof Array) return obj.map((item) => deepClone(item)) as T;
   if (obj instanceof Object) {
     const clonedObj = {} as T;
     for (const key in obj) {
@@ -78,7 +81,10 @@ export interface UpdateCommonConfigResult {
 }
 
 // 验证JSON配置格式
-export const validateJsonConfig = (value: string, fieldName: string = "配置"): string => {
+export const validateJsonConfig = (
+  value: string,
+  fieldName: string = "配置",
+): string => {
   if (!value.trim()) {
     return "";
   }
@@ -123,7 +129,7 @@ export const updateCommonConfigSnippet = (
       error: snippetError,
     };
   }
-  
+
   const snippet = JSON.parse(snippetString) as Record<string, any>;
 
   if (enabled) {
@@ -205,14 +211,14 @@ export const setApiKeyInConfig = (
 
 // ========== TOML Config Utilities ==========
 
-const COMMON_CONFIG_MARKER_START = "# === COMMON CONFIG START ===";
-const COMMON_CONFIG_MARKER_END = "# === COMMON CONFIG END ===";
-
 export interface UpdateTomlCommonConfigResult {
   updatedConfig: string;
   error?: string;
 }
 
+// 保存之前的通用配置片段，用于替换操作
+let previousCommonSnippet = "";
+
 // 将通用配置片段写入/移除 TOML 配置
 export const updateTomlCommonConfigSnippet = (
   tomlString: string,
@@ -220,71 +226,64 @@ export const updateTomlCommonConfigSnippet = (
   enabled: boolean,
 ): UpdateTomlCommonConfigResult => {
   if (!snippetString.trim()) {
-    // 如果片段为空，移除已存在的通用配置部分
-    const cleaned = removeTomlCommonConfig(tomlString);
+    // 如果片段为空，直接返回原始配置
     return {
-      updatedConfig: cleaned,
+      updatedConfig: tomlString,
     };
   }
 
   if (enabled) {
     // 添加通用配置
-    const withoutOld = removeTomlCommonConfig(tomlString);
-    const commonSection = `\n${COMMON_CONFIG_MARKER_START}\n${snippetString}\n${COMMON_CONFIG_MARKER_END}\n`;
+    // 先移除旧的通用配置（如果有）
+    let updatedConfig = tomlString;
+    if (previousCommonSnippet && tomlString.includes(previousCommonSnippet)) {
+      updatedConfig = tomlString.replace(previousCommonSnippet, "");
+    }
+
+    // 在文件末尾添加新的通用配置
+    // 确保有适当的换行
+    const needsNewline = updatedConfig && !updatedConfig.endsWith("\n");
+    updatedConfig =
+      updatedConfig + (needsNewline ? "\n\n" : "\n") + snippetString;
+
+    // 保存当前通用配置片段
+    previousCommonSnippet = snippetString;
+
     return {
-      updatedConfig: withoutOld + commonSection,
+      updatedConfig: updatedConfig.trim() + "\n",
     };
   } else {
     // 移除通用配置
-    const cleaned = removeTomlCommonConfig(tomlString);
+    if (tomlString.includes(snippetString)) {
+      const updatedConfig = tomlString.replace(snippetString, "");
+      // 清理多余的空行
+      const cleaned = updatedConfig.replace(/\n{3,}/g, "\n\n").trim();
+
+      // 清空保存的状态
+      previousCommonSnippet = "";
+
+      return {
+        updatedConfig: cleaned ? cleaned + "\n" : "",
+      };
+    }
     return {
-      updatedConfig: cleaned,
+      updatedConfig: tomlString,
     };
   }
 };
 
-// 从 TOML 中移除通用配置部分
-const removeTomlCommonConfig = (tomlString: string): string => {
-  const startIdx = tomlString.indexOf(COMMON_CONFIG_MARKER_START);
-  const endIdx = tomlString.indexOf(COMMON_CONFIG_MARKER_END);
-  
-  if (startIdx === -1 || endIdx === -1) {
-    return tomlString;
-  }
-  
-  // 找到标记前的换行符（如果有）
-  let realStartIdx = startIdx;
-  if (startIdx > 0 && tomlString[startIdx - 1] === '\n') {
-    realStartIdx = startIdx - 1;
-  }
-  
-  // 找到标记后的换行符（如果有）
-  let realEndIdx = endIdx + COMMON_CONFIG_MARKER_END.length;
-  if (realEndIdx < tomlString.length && tomlString[realEndIdx] === '\n') {
-    realEndIdx = realEndIdx + 1;
-  }
-  
-  return tomlString.slice(0, realStartIdx) + tomlString.slice(realEndIdx);
-};
-
 // 检查 TOML 配置是否已包含通用配置片段
 export const hasTomlCommonConfigSnippet = (
   tomlString: string,
   snippetString: string,
 ): boolean => {
   if (!snippetString.trim()) return false;
-  
-  const startIdx = tomlString.indexOf(COMMON_CONFIG_MARKER_START);
-  const endIdx = tomlString.indexOf(COMMON_CONFIG_MARKER_END);
-  
-  if (startIdx === -1 || endIdx === -1 || startIdx >= endIdx) {
-    return false;
-  }
-  
-  // 提取标记之间的内容
-  const existingSnippet = tomlString
-    .slice(startIdx + COMMON_CONFIG_MARKER_START.length, endIdx)
-    .trim();
-  
-  return existingSnippet === snippetString.trim();
+
+  // 简单检查配置是否包含片段内容
+  // 去除空白字符后比较，避免格式差异影响
+  const normalizeWhitespace = (str: string) => str.replace(/\s+/g, " ").trim();
+
+  return normalizeWhitespace(tomlString).includes(
+    normalizeWhitespace(snippetString),
+  );
 };