diff --git a/mateclaw-server/src/main/java/vip/mate/tool/guard/service/ToolGuardRuleService.java b/mateclaw-server/src/main/java/vip/mate/tool/guard/service/ToolGuardRuleService.java
index 340124b4..9dfdbe4b 100644
--- a/mateclaw-server/src/main/java/vip/mate/tool/guard/service/ToolGuardRuleService.java
+++ b/mateclaw-server/src/main/java/vip/mate/tool/guard/service/ToolGuardRuleService.java
@@ -64,6 +64,10 @@ public class ToolGuardRuleService {
      * 新增自定义规则
      */
     public ToolGuardRuleEntity createRule(ToolGuardRuleEntity rule) {
+        if (rule == null || rule.getRuleId() == null || rule.getRuleId().isBlank()) {
+            throw new IllegalArgumentException("Rule ID is required");
+        }
+        rule.setRuleId(rule.getRuleId().trim());
         rule.setBuiltin(false);
         ruleMapper.insert(rule);
         ruleRegistry.reload();
diff --git a/mateclaw-ui/src/i18n/locales/en-US.ts b/mateclaw-ui/src/i18n/locales/en-US.ts
index c09c1172..8cb9907f 100644
--- a/mateclaw-ui/src/i18n/locales/en-US.ts
+++ b/mateclaw-ui/src/i18n/locales/en-US.ts
@@ -1340,6 +1340,10 @@ export default {
         remediation: 'Remediation',
         priority: 'Priority',
       },
+      messages: {
+        ruleIdRequired: 'Rule ID is required',
+        saveFailed: 'Failed to save rule',
+      },
     },
     fileGuard: {
       title: 'File Guard',
diff --git a/mateclaw-ui/src/i18n/locales/zh-CN.ts b/mateclaw-ui/src/i18n/locales/zh-CN.ts
index 3e461d7b..86a55099 100644
--- a/mateclaw-ui/src/i18n/locales/zh-CN.ts
+++ b/mateclaw-ui/src/i18n/locales/zh-CN.ts
@@ -1238,6 +1238,10 @@ export default {
         remediation: '修复建议',
         priority: '优先级',
       },
+      messages: {
+        ruleIdRequired: '规则 ID 不能为空',
+        saveFailed: '保存规则失败',
+      },
     },
     fileGuard: {
       title: '文件防护',
diff --git a/mateclaw-ui/src/views/Security/ToolGuard/index.vue b/mateclaw-ui/src/views/Security/ToolGuard/index.vue
index 1361f7a7..d64d7996 100644
--- a/mateclaw-ui/src/views/Security/ToolGuard/index.vue
+++ b/mateclaw-ui/src/views/Security/ToolGuard/index.vue
@@ -146,8 +146,13 @@
           <div class="modal-body">
             <div class="form-grid">
               <div class="form-group" v-if="!editingRule">
-                <label>{{ t('security.toolGuard.fields.ruleId') }}</label>
-                <input v-model="ruleForm.ruleId" class="form-input" placeholder="CUSTOM_RULE_001" />
+                <label>{{ t('security.toolGuard.fields.ruleId') }} <span class="required">*</span></label>
+                <input
+                  v-model.trim="ruleForm.ruleId"
+                  class="form-input"
+                  placeholder="CUSTOM_RULE_001"
+                  required
+                />
               </div>
               <div class="form-group">
                 <label>{{ t('security.toolGuard.fields.name') }}</label>
@@ -215,6 +220,7 @@
 <script setup lang="ts">
 import { ref, reactive, onMounted } from 'vue'
 import { useI18n } from 'vue-i18n'
+import { ElMessage } from 'element-plus'
 import { securityApi } from '@/api'
 import { parseJsonArray } from '../composables/helpers'
 import type { GuardRule } from '@/types'
@@ -350,6 +356,11 @@ function openEditRuleModal(rule: GuardRule) {
 }
 
 async function saveRule() {
+  if (!editingRule.value && !ruleForm.ruleId.trim()) {
+    ElMessage.error(t('security.toolGuard.messages.ruleIdRequired'))
+    return
+  }
+
   try {
     if (editingRule.value) {
       await securityApi.updateRule(editingRule.value.ruleId, ruleForm)
@@ -358,8 +369,8 @@ async function saveRule() {
     }
     showRuleModal.value = false
     loadRules()
-  } catch {
-    // ignore
+  } catch (e: any) {
+    ElMessage.error(e?.msg || e?.message || t('security.toolGuard.messages.saveFailed'))
   }
 }
 
@@ -398,6 +409,7 @@ onMounted(async () => {
 .subsection-title { font-size: 16px; font-weight: 600; color: var(--mc-text-primary); margin: 0 0 12px; }
 
 .rule-name { font-weight: 500; }
+.required { color: var(--mc-danger, #ef4444); }
 .rule-pattern {
   font-family: 'SF Mono', 'Fira Code', monospace;
   font-size: 11px;