diff --git a/src/components/ProviderForm/CodexConfigEditor.tsx b/src/components/ProviderForm/CodexConfigEditor.tsx
index 17f6201..eae23be 100644
--- a/src/components/ProviderForm/CodexConfigEditor.tsx
+++ b/src/components/ProviderForm/CodexConfigEditor.tsx
@@ -33,15 +33,17 @@ interface CodexConfigEditorProps {
 
   authError: string;
 
-  isCustomMode?: boolean; // 新增：是否为自定义模式
+  configError: string; // config.toml 错误提示
 
-  onWebsiteUrlChange?: (url: string) => void; // 新增：更新网址回调
+  isCustomMode?: boolean; // 是否为自定义模式
 
-  isTemplateModalOpen?: boolean; // 新增：模态框状态
+  onWebsiteUrlChange?: (url: string) => void; // 更新网址回调
 
-  setIsTemplateModalOpen?: (open: boolean) => void; // 新增：设置模态框状态
+  isTemplateModalOpen?: boolean; // 模态框状态
 
-  onNameChange?: (name: string) => void; // 新增：更新供应商名称回调
+  setIsTemplateModalOpen?: (open: boolean) => void; // 设置模态框状态
+
+  onNameChange?: (name: string) => void; // 更新供应商名称回调
 }
 
 const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
@@ -67,6 +69,8 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
 
   authError,
 
+  configError,
+
   onWebsiteUrlChange,
 
   onNameChange,
@@ -324,6 +328,10 @@ const CodexConfigEditor: React.FC<CodexConfigEditorProps> = ({
           data-enable-grammarly="false"
         />
 
+        {configError && (
+          <p className="text-xs text-red-500 dark:text-red-400">{configError}</p>
+        )}
+
         <p className="text-xs text-gray-500 dark:text-gray-400">
           {t("codexConfig.configTomlHint")}
         </p>
diff --git a/src/components/providers/forms/ProviderForm.tsx b/src/components/providers/forms/ProviderForm.tsx
index 89aa87d..c02d7a2 100644
--- a/src/components/providers/forms/ProviderForm.tsx
+++ b/src/components/providers/forms/ProviderForm.tsx
@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useState } from "react";
+import { useEffect, useMemo, useState, useCallback } from "react";
 import { useForm } from "react-hook-form";
 import { zodResolver } from "@hookform/resolvers/zod";
 import { useTranslation } from "react-i18next";
@@ -32,6 +32,7 @@ import {
   useCommonConfigSnippet,
   useCodexCommonConfig,
   useSpeedTestEndpoints,
+  useCodexTomlValidation,
 } from "./hooks";
 
 const CLAUDE_DEFAULT_CONFIG = JSON.stringify({ env: {}, config: {} }, null, 2);
@@ -149,10 +150,19 @@ export function ProviderForm({
     setCodexAuth,
     handleCodexApiKeyChange,
     handleCodexBaseUrlChange,
-    handleCodexConfigChange,
+    handleCodexConfigChange: originalHandleCodexConfigChange,
     resetCodexConfig,
   } = useCodexConfigState({ initialData });
 
+  // 使用 Codex TOML 校验 hook (仅 Codex 模式)
+  const { configError: codexConfigError, debouncedValidate } = useCodexTomlValidation();
+
+  // 包装 handleCodexConfigChange，添加实时校验
+  const handleCodexConfigChange = useCallback((value: string) => {
+    originalHandleCodexConfigChange(value);
+    debouncedValidate(value);
+  }, [originalHandleCodexConfigChange, debouncedValidate]);
+
   const [isCodexEndpointModalOpen, setIsCodexEndpointModalOpen] =
     useState(false);
   const [isCodexTemplateModalOpen, setIsCodexTemplateModalOpen] =
@@ -511,6 +521,7 @@ export function ProviderForm({
             onCommonConfigSnippetChange={handleCodexCommonConfigSnippetChange}
             commonConfigError={codexCommonConfigError}
             authError={codexAuthError}
+            configError={codexConfigError}
             isCustomMode={selectedPresetId === "custom"}
             onWebsiteUrlChange={(url) => form.setValue("websiteUrl", url)}
             onNameChange={(name) => form.setValue("name", name)}
diff --git a/src/components/providers/forms/hooks/index.ts b/src/components/providers/forms/hooks/index.ts
index 09ea653..f1024ca 100644
--- a/src/components/providers/forms/hooks/index.ts
+++ b/src/components/providers/forms/hooks/index.ts
@@ -10,3 +10,4 @@ export { useTemplateValues } from "./useTemplateValues";
 export { useCommonConfigSnippet } from "./useCommonConfigSnippet";
 export { useCodexCommonConfig } from "./useCodexCommonConfig";
 export { useSpeedTestEndpoints } from "./useSpeedTestEndpoints";
+export { useCodexTomlValidation } from "./useCodexTomlValidation";
diff --git a/src/components/providers/forms/hooks/useCodexTomlValidation.ts b/src/components/providers/forms/hooks/useCodexTomlValidation.ts
new file mode 100644
index 0000000..49289d4
--- /dev/null
+++ b/src/components/providers/forms/hooks/useCodexTomlValidation.ts
@@ -0,0 +1,75 @@
+import { useState, useCallback, useEffect, useRef } from 'react';
+import TOML from 'smol-toml';
+
+/**
+ * Codex config.toml 格式校验 Hook
+ * 使用 smol-toml 进行实时 TOML 语法校验（带 debounce）
+ */
+export function useCodexTomlValidation() {
+  const [configError, setConfigError] = useState('');
+  const debounceTimerRef = useRef<NodeJS.Timeout | null>(null);
+
+  /**
+   * 校验 TOML 格式
+   * @param tomlText - 待校验的 TOML 文本
+   * @returns 是否校验通过
+   */
+  const validateToml = useCallback((tomlText: string): boolean => {
+    // 空字符串视为合法（允许为空）
+    if (!tomlText.trim()) {
+      setConfigError('');
+      return true;
+    }
+
+    try {
+      TOML.parse(tomlText);
+      setConfigError('');
+      return true;
+    } catch (error) {
+      const errorMessage = error instanceof Error
+        ? error.message
+        : 'TOML 格式错误';
+      setConfigError(errorMessage);
+      return false;
+    }
+  }, []);
+
+  /**
+   * 带 debounce 的校验函数（500ms 延迟）
+   * @param tomlText - 待校验的 TOML 文本
+   */
+  const debouncedValidate = useCallback((tomlText: string) => {
+    // 清除之前的定时器
+    if (debounceTimerRef.current) {
+      clearTimeout(debounceTimerRef.current);
+    }
+
+    // 设置新的定时器
+    debounceTimerRef.current = setTimeout(() => {
+      validateToml(tomlText);
+    }, 500);
+  }, [validateToml]);
+
+  /**
+   * 清空错误信息
+   */
+  const clearError = useCallback(() => {
+    setConfigError('');
+  }, []);
+
+  // 清理定时器
+  useEffect(() => {
+    return () => {
+      if (debounceTimerRef.current) {
+        clearTimeout(debounceTimerRef.current);
+      }
+    };
+  }, []);
+
+  return {
+    configError,
+    validateToml,
+    debouncedValidate,
+    clearError,
+  };
+}