diff --git a/apps/web/src/components/ChatComposer.tsx b/apps/web/src/components/ChatComposer.tsx
index 93329aaef..0e21d4e01 100644
--- a/apps/web/src/components/ChatComposer.tsx
+++ b/apps/web/src/components/ChatComposer.tsx
@@ -2426,8 +2426,8 @@ function mcpTemplateMatchesQuery(tpl: McpTemplate, query: string): boolean {
     .includes(q);
 }
 
-function pluginSourceLabel(plugin: InstalledPluginRecord): string {
-  return plugin.sourceKind === 'bundled' ? 'Official' : 'My plugin';
+function pluginSourceLabel(plugin: InstalledPluginRecord, t: TranslateFn): string {
+  return plugin.sourceKind === 'bundled' ? t('chat.mentionPluginOfficial') : t('chat.mentionPluginMine');
 }
 
 function ToolsImportPanel({
@@ -2574,16 +2574,16 @@ function MentionPopover({
   onPickMcp: (server: McpServerConfig) => void;
   onPickConnector: (connector: ConnectorDetail) => void;
 }) {
-  const { locale } = useI18n();
+  const { locale, t } = useI18n();
   const ref = useRef<HTMLDivElement | null>(null);
   const [tab, setTab] = useState<MentionTab>('all');
   const tabs: Array<{ id: MentionTab; label: string }> = [
-    { id: 'all', label: 'All' },
-    { id: 'plugins', label: 'Plugins' },
-    { id: 'skills', label: 'Skills' },
-    { id: 'mcp', label: 'MCP' },
-    { id: 'connectors', label: 'Connectors' },
-    { id: 'files', label: 'Design files' },
+    { id: 'all', label: t('chat.mentionTabAll') },
+    { id: 'plugins', label: t('chat.mentionTabPlugins') },
+    { id: 'skills', label: t('chat.mentionTabSkills') },
+    { id: 'mcp', label: t('chat.mentionTabMcp') },
+    { id: 'connectors', label: t('chat.mentionTabConnectors') },
+    { id: 'files', label: t('chat.mentionTabFiles') },
   ];
   const showPlugins = tab === 'all' || tab === 'plugins';
   const showSkills = tab === 'all' || tab === 'skills';
@@ -2601,7 +2601,7 @@ function MentionPopover({
   }, [connectors, files, plugins, skills, mcpServers, tab]);
   return (
     <div className="mention-popover" data-testid="mention-popover">
-      <div className="mention-tabs" role="tablist" aria-label="Mention surfaces">
+      <div className="mention-tabs" role="tablist" aria-label={t('chat.mentionTabsAria')}>
         {tabs.map((item) => (
           <button
             key={item.id}
@@ -2620,15 +2620,15 @@ function MentionPopover({
         {!hasVisibleResults ? (
           <div className="mention-empty">
             {query ? (
-              <>No results for “{query}”.</>
+              <>{t('chat.mentionNoResults', { query })}</>
             ) : (
-              <>Search plugins, skills, MCP servers, connectors, and Design Files.</>
+              <>{t('chat.mentionSearchPrompt')}</>
             )}
           </div>
         ) : null}
         {showPlugins && plugins.length > 0 ? (
         <>
-          <div className="mention-section-label">Plugins</div>
+          <div className="mention-section-label">{t('chat.mentionSectionPlugins')}</div>
           {plugins.map((p) => (
             <button
               key={`plugin-${p.id}`}
@@ -2645,14 +2645,14 @@ function MentionPopover({
                   {p.manifest?.description ?? p.id}
                 </span>
               </span>
-              <span className="mention-meta">{pluginSourceLabel(p)}</span>
+              <span className="mention-meta">{pluginSourceLabel(p, t)}</span>
             </button>
           ))}
         </>
       ) : null}
         {showSkills && skills.length > 0 ? (
           <>
-            <div className="mention-section-label">Skills</div>
+            <div className="mention-section-label">{t('chat.mentionSectionSkills')}</div>
             {skills.map((skill) => {
               const active = skill.id === currentSkillId;
               return (
@@ -2671,7 +2671,7 @@ function MentionPopover({
                       {localizeSkillDescription(locale, skill) || skill.id}
                     </span>
                   </span>
-                  <span className="mention-meta">{active ? 'Active' : skill.mode}</span>
+                  <span className="mention-meta">{active ? t('chat.mentionActiveSkill') : skill.mode}</span>
                 </button>
               );
             })}
@@ -2679,7 +2679,7 @@ function MentionPopover({
         ) : null}
         {showMcp && mcpServers.length > 0 ? (
           <>
-            <div className="mention-section-label">MCP</div>
+            <div className="mention-section-label">{t('chat.mentionSectionMcp')}</div>
             {mcpServers.map((server) => (
               <button
                 key={`mcp-${server.id}`}
@@ -2687,7 +2687,7 @@ function MentionPopover({
                 type="button"
                 onMouseDown={(e) => e.preventDefault()}
                 onClick={() => onPickMcp(server)}
-                title={`Use ${server.label || server.id}`}
+                title={t('chat.mentionUseMcpTitle', { name: server.label || server.id })}
               >
                 <Icon name="link" size={12} />
                 <span className="mention-item-body">
@@ -2703,7 +2703,7 @@ function MentionPopover({
         ) : null}
         {showConnectors && connectors.length > 0 ? (
           <>
-            <div className="mention-section-label">Connectors</div>
+            <div className="mention-section-label">{t('chat.mentionSectionConnectors')}</div>
             {connectors.map((connector) => (
               <button
                 key={`connector-${connector.id}`}
@@ -2711,7 +2711,7 @@ function MentionPopover({
                 type="button"
                 onMouseDown={(e) => e.preventDefault()}
                 onClick={() => onPickConnector(connector)}
-                title={`Use ${connector.name}`}
+                title={t('chat.mentionUseConnectorTitle', { name: connector.name })}
               >
                 <Icon name="link" size={12} />
                 <span className="mention-item-body">
@@ -2727,7 +2727,7 @@ function MentionPopover({
         ) : null}
         {showFiles && files.length > 0 ? (
         <>
-          <div className="mention-section-label">Design files</div>
+          <div className="mention-section-label">{t('chat.mentionSectionFiles')}</div>
           {files.map((f) => {
             const key = f.path ?? f.name;
             return (
diff --git a/apps/web/src/i18n/locales/en.ts b/apps/web/src/i18n/locales/en.ts
index 593a40246..20feef751 100644
--- a/apps/web/src/i18n/locales/en.ts
+++ b/apps/web/src/i18n/locales/en.ts
@@ -1470,6 +1470,25 @@ export const en: Dict = {
   'chat.importFolder': 'Link code folder',
   'chat.importSkills': 'Skills and design systems',
   'chat.importProject': 'Reference another project',
+  'chat.mentionTabsAria': 'Mention surfaces',
+  'chat.mentionTabAll': 'All',
+  'chat.mentionTabPlugins': 'Plugins',
+  'chat.mentionTabSkills': 'Skills',
+  'chat.mentionTabMcp': 'MCP',
+  'chat.mentionTabConnectors': 'Connectors',
+  'chat.mentionTabFiles': 'Design files',
+  'chat.mentionNoResults': 'No results for “{query}”.',
+  'chat.mentionSearchPrompt': 'Search plugins, skills, MCP servers, connectors, and Design Files.',
+  'chat.mentionSectionPlugins': 'Plugins',
+  'chat.mentionSectionSkills': 'Skills',
+  'chat.mentionSectionMcp': 'MCP',
+  'chat.mentionSectionConnectors': 'Connectors',
+  'chat.mentionSectionFiles': 'Design files',
+  'chat.mentionActiveSkill': 'Active',
+  'chat.mentionUseMcpTitle': 'Use {name}',
+  'chat.mentionUseConnectorTitle': 'Use {name}',
+  'chat.mentionPluginOfficial': 'Official',
+  'chat.mentionPluginMine': 'My plugin',
   'chat.linkedFolderRemoveAria': 'Remove linked folder {path}',
   'chat.linkedFolderNotFound': 'Folder does not exist',
   'chat.linkedFolderAlready': 'This folder is already linked',
diff --git a/apps/web/src/i18n/locales/zh-CN.ts b/apps/web/src/i18n/locales/zh-CN.ts
index 9819c2ae2..ff74b3ec3 100644
--- a/apps/web/src/i18n/locales/zh-CN.ts
+++ b/apps/web/src/i18n/locales/zh-CN.ts
@@ -1461,6 +1461,25 @@ export const zhCN: Dict = {
   'chat.importFolder': '关联代码目录',
   'chat.importSkills': '技能与设计体系',
   'chat.importProject': '引用其它项目',
+  'chat.mentionTabsAria': '提及来源',
+  'chat.mentionTabAll': '全部',
+  'chat.mentionTabPlugins': '插件',
+  'chat.mentionTabSkills': '技能',
+  'chat.mentionTabMcp': 'MCP',
+  'chat.mentionTabConnectors': '连接器',
+  'chat.mentionTabFiles': '设计文件',
+  'chat.mentionNoResults': '没有找到“{query}”的结果。',
+  'chat.mentionSearchPrompt': '搜索插件、技能、MCP 服务器、连接器和设计文件。',
+  'chat.mentionSectionPlugins': '插件',
+  'chat.mentionSectionSkills': '技能',
+  'chat.mentionSectionMcp': 'MCP',
+  'chat.mentionSectionConnectors': '连接器',
+  'chat.mentionSectionFiles': '设计文件',
+  'chat.mentionActiveSkill': '已启用',
+  'chat.mentionUseMcpTitle': '使用 {name}',
+  'chat.mentionUseConnectorTitle': '使用 {name}',
+  'chat.mentionPluginOfficial': '官方',
+  'chat.mentionPluginMine': '我的插件',
   'chat.linkedFolderRemoveAria': '移除关联文件夹 {path}',
   'chat.linkedFolderNotFound': '文件夹不存在',
   'chat.linkedFolderAlready': '该文件夹已关联',
diff --git a/apps/web/src/i18n/locales/zh-TW.ts b/apps/web/src/i18n/locales/zh-TW.ts
index 106484017..567bf68d9 100644
--- a/apps/web/src/i18n/locales/zh-TW.ts
+++ b/apps/web/src/i18n/locales/zh-TW.ts
@@ -1061,6 +1061,25 @@ export const zhTW: Dict = {
   'chat.importFolder': '關聯程式碼目錄',
   'chat.importSkills': '技能與設計系統',
   'chat.importProject': '引用其它專案',
+  'chat.mentionTabsAria': '提及來源',
+  'chat.mentionTabAll': '全部',
+  'chat.mentionTabPlugins': '外掛',
+  'chat.mentionTabSkills': '技能',
+  'chat.mentionTabMcp': 'MCP',
+  'chat.mentionTabConnectors': '連接器',
+  'chat.mentionTabFiles': '設計檔案',
+  'chat.mentionNoResults': '找不到「{query}」的結果。',
+  'chat.mentionSearchPrompt': '搜尋外掛、技能、MCP 伺服器、連接器和設計檔案。',
+  'chat.mentionSectionPlugins': '外掛',
+  'chat.mentionSectionSkills': '技能',
+  'chat.mentionSectionMcp': 'MCP',
+  'chat.mentionSectionConnectors': '連接器',
+  'chat.mentionSectionFiles': '設計檔案',
+  'chat.mentionActiveSkill': '已啟用',
+  'chat.mentionUseMcpTitle': '使用 {name}',
+  'chat.mentionUseConnectorTitle': '使用 {name}',
+  'chat.mentionPluginOfficial': '官方',
+  'chat.mentionPluginMine': '我的外掛',
   'chat.linkedFolderRemoveAria': '移除關聯資料夾 {path}',
   'chat.linkedFolderNotFound': '資料夾不存在',
   'chat.linkedFolderAlready': '該資料夾已關聯',
diff --git a/apps/web/src/i18n/types.ts b/apps/web/src/i18n/types.ts
index 12d514bfc..ba7c7040b 100644
--- a/apps/web/src/i18n/types.ts
+++ b/apps/web/src/i18n/types.ts
@@ -1781,6 +1781,25 @@ export interface Dict {
   'chat.importFolder': string;
   'chat.importSkills': string;
   'chat.importProject': string;
+  'chat.mentionTabsAria': string;
+  'chat.mentionTabAll': string;
+  'chat.mentionTabPlugins': string;
+  'chat.mentionTabSkills': string;
+  'chat.mentionTabMcp': string;
+  'chat.mentionTabConnectors': string;
+  'chat.mentionTabFiles': string;
+  'chat.mentionNoResults': string;
+  'chat.mentionSearchPrompt': string;
+  'chat.mentionSectionPlugins': string;
+  'chat.mentionSectionSkills': string;
+  'chat.mentionSectionMcp': string;
+  'chat.mentionSectionConnectors': string;
+  'chat.mentionSectionFiles': string;
+  'chat.mentionActiveSkill': string;
+  'chat.mentionUseMcpTitle': string;
+  'chat.mentionUseConnectorTitle': string;
+  'chat.mentionPluginOfficial': string;
+  'chat.mentionPluginMine': string;
   'chat.linkedFolderRemoveAria': string;
   'chat.linkedFolderNotFound': string;
   'chat.linkedFolderAlready': string;
diff --git a/apps/web/tests/components/ChatComposer.context-pickers.test.tsx b/apps/web/tests/components/ChatComposer.context-pickers.test.tsx
index f2f378ebc..192e23557 100644
--- a/apps/web/tests/components/ChatComposer.context-pickers.test.tsx
+++ b/apps/web/tests/components/ChatComposer.context-pickers.test.tsx
@@ -5,6 +5,8 @@ import type { ComponentProps } from 'react';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
 
 import { ChatComposer } from '../../src/components/ChatComposer';
+import { I18nProvider } from '../../src/i18n';
+import type { Locale } from '../../src/i18n/types';
 
 const COMMUNITY_PLUGIN = {
   id: 'community-deck',
@@ -115,8 +117,11 @@ let plugins = [COMMUNITY_PLUGIN, USER_PLUGIN];
 let skills = [SKILL];
 let servers = [MCP_SERVER];
 
-function renderComposer(overrides: Partial<ComponentProps<typeof ChatComposer>> = {}) {
-  return render(
+function renderComposer(
+  overrides: Partial<ComponentProps<typeof ChatComposer>> = {},
+  options: { locale?: Locale } = {},
+) {
+  const tree = (
     <ChatComposer
       projectId="project-1"
       projectFiles={[]}
@@ -127,7 +132,19 @@ function renderComposer(overrides: Partial<ComponentProps<typeof ChatComposer>>
       onOpenMcpSettings={vi.fn()}
       skills={skills}
       {...overrides}
-    />,
+    />
+  );
+
+  if (options.locale) {
+    return render(
+      <I18nProvider initial={options.locale}>
+        {tree}
+      </I18nProvider>,
+    );
+  }
+
+  return render(
+    tree,
   );
 }
 
@@ -196,6 +213,33 @@ describe('ChatComposer context pickers', () => {
     expect(screen.getByText('Search plugins, skills, MCP servers, connectors, and Design Files.')).toBeTruthy();
   });
 
+  it('localizes @ panel tabs and empty states in Chinese mode', async () => {
+    plugins = [];
+    skills = [];
+    servers = [];
+    renderComposer({}, { locale: 'zh-CN' });
+    const input = screen.getByTestId('chat-composer-input') as HTMLTextAreaElement;
+
+    fireEvent.change(input, {
+      target: { value: '@', selectionStart: 1 },
+    });
+
+    expect(screen.getByRole('tab', { name: '全部' })).toBeTruthy();
+    expect(screen.getByRole('tab', { name: '插件' })).toBeTruthy();
+    expect(screen.getByRole('tab', { name: '技能' })).toBeTruthy();
+    expect(screen.getByRole('tab', { name: 'MCP' })).toBeTruthy();
+    expect(screen.getByRole('tab', { name: '连接器' })).toBeTruthy();
+    expect(screen.getByRole('tab', { name: '设计文件' })).toBeTruthy();
+    expect(screen.getByText('搜索插件、技能、MCP 服务器、连接器和设计文件。')).toBeTruthy();
+
+    fireEvent.change(input, {
+      target: { value: '@missing', selectionStart: 8 },
+    });
+
+    expect(screen.getByText('没有找到“missing”的结果。')).toBeTruthy();
+    expect(screen.queryByText('No results for “missing”.')).toBeNull();
+  });
+
   it('selects an MCP server from @ search and keeps the inline token visible', async () => {
     renderComposer();
     const input = screen.getByTestId('chat-composer-input') as HTMLTextAreaElement;