diff --git a/apps/web/src/components/RoutinesSection.tsx b/apps/web/src/components/RoutinesSection.tsx
index bcfd0325d..acff5c500 100644
--- a/apps/web/src/components/RoutinesSection.tsx
+++ b/apps/web/src/components/RoutinesSection.tsx
@@ -174,14 +174,56 @@ function formatRunTimestamp(ts: number): string {
   });
 }
 
-function runFailureReason(run: {
-  status: RoutineRun['status'];
-  error?: string | null;
-  summary?: string | null;
-} | null | undefined): string | null {
+// Maps known daemon-surfaced failure message prefixes onto i18n keys, so
+// users running the app in a non-English locale see a translated reason
+// instead of the raw English string the daemon ships to web (see e.g.
+// `apps/daemon/src/server.ts` `createSseErrorPayload` callsites). We match
+// on a stable prefix rather than the full string so any trailing context
+// the daemon may append (e.g. `: <provider detail>`) is preserved verbatim
+// after the localized prefix — losing it would hide debugging context the
+// caller may rely on. Anything not in this list passes through untouched —
+// untranslated failures continue to surface so behavior never regresses,
+// they just stay in English until a matching i18n key is added here.
+// Each entry is the *full current daemon message* (copied verbatim from
+// the corresponding `createSseErrorPayload` call) paired with the i18n
+// key that translates it. We match on full-string prefix so the current
+// contract resolves to `t(key)` exactly; if the daemon later appends
+// extra context (e.g. `: <provider detail>`), the extra text is
+// preserved as a suffix on the translated message rather than dropped.
+const KNOWN_DAEMON_ERROR_PREFIXES: ReadonlyArray<readonly [string, keyof Dict]> = [
+  [
+    // Source: apps/daemon/src/server.ts `AGENT_EXECUTION_FAILED` payload.
+    'Agent completed without producing any output. The model or provider may have returned an empty response — check the agent logs for upstream errors.',
+    'routines.error.agentEmptyOutput',
+  ],
+];
+
+function localizeRoutineError(t: TranslateFn, raw: string): string {
+  for (const [prefix, key] of KNOWN_DAEMON_ERROR_PREFIXES) {
+    if (raw.startsWith(prefix)) {
+      // Preserve any suffix the daemon may have appended (e.g. provider
+      // detail after the known prefix). When the daemon emits exactly
+      // the prefix string today, `suffix` is empty and the result is
+      // just `t(key)`; nothing changes for the current contract.
+      const suffix = raw.slice(prefix.length);
+      return `${t(key)}${suffix}`;
+    }
+  }
+  return raw;
+}
+
+function runFailureReason(
+  t: TranslateFn,
+  run: {
+    status: RoutineRun['status'];
+    error?: string | null;
+    summary?: string | null;
+  } | null | undefined,
+): string | null {
   if (!run || run.status !== 'failed') return null;
   const reason = (run.error || run.summary || '').trim();
-  return reason || null;
+  if (!reason) return null;
+  return localizeRoutineError(t, reason);
 }
 
 type FormState = {
@@ -414,7 +456,7 @@ function RunHistory({
   return (
     <ul className="routines-history">
       {runs.map((r) => {
-        const failureReason = runFailureReason(r);
+        const failureReason = runFailureReason(t, r);
         return (
           <li key={r.id} className="routines-history-row">
             <StatusPill status={r.status} t={t} />
@@ -763,7 +805,7 @@ export function RoutinesSection({ onClose }: RoutinesSectionProps) {
                 : t('routines.targetCreate');
             const isBusy = busyId === r.id;
             const isExpanded = expandedId === r.id;
-            const failureReason = runFailureReason(r.lastRun);
+            const failureReason = runFailureReason(t, r.lastRun);
             return (
               <li key={r.id} className={`routines-card routines-item${r.enabled ? '' : ' is-disabled'}`}>
                 <div className="routines-item-head">
diff --git a/apps/web/src/i18n/locales/en.ts b/apps/web/src/i18n/locales/en.ts
index f2cd3cd78..ca04f8e51 100644
--- a/apps/web/src/i18n/locales/en.ts
+++ b/apps/web/src/i18n/locales/en.ts
@@ -967,6 +967,8 @@ export const en: Dict = {
     'Delete this automation? Past runs and their projects are kept.',
   'routines.errorPickProject':
     'Pick a project to reuse, or switch to “Create new each run”',
+  'routines.error.agentEmptyOutput':
+    'Agent completed without producing any output. The model or provider may have returned an empty response — check the agent logs for upstream errors.',
   'entry.helpAria': 'Help',
   'entry.helpMenuAria': 'Help menu',
   'entry.helpGetHelp': 'Get help on GitHub',
diff --git a/apps/web/src/i18n/locales/zh-CN.ts b/apps/web/src/i18n/locales/zh-CN.ts
index 115f85b82..59e58f305 100644
--- a/apps/web/src/i18n/locales/zh-CN.ts
+++ b/apps/web/src/i18n/locales/zh-CN.ts
@@ -964,6 +964,8 @@ export const zhCN: Dict = {
   'routines.status.canceled': '已取消',
   'routines.confirmDelete': '删除此自动化？过往运行记录及其项目将予以保留。',
   'routines.errorPickProject': '请选择要复用的项目，或切换为“每次运行新建项目”。',
+  'routines.error.agentEmptyOutput':
+    '智能体执行完成但未产生任何输出。模型或服务商可能返回了空响应——请查看智能体日志以排查上游错误。',
   'entry.helpAria': '帮助',
   'entry.helpMenuAria': '帮助菜单',
   'entry.helpGetHelp': '在 GitHub 上获取帮助',
diff --git a/apps/web/src/i18n/locales/zh-TW.ts b/apps/web/src/i18n/locales/zh-TW.ts
index 644391e94..2fb18325d 100644
--- a/apps/web/src/i18n/locales/zh-TW.ts
+++ b/apps/web/src/i18n/locales/zh-TW.ts
@@ -698,6 +698,8 @@ export const zhTW: Dict = {
   'routines.status.canceled': '已取消',
   'routines.confirmDelete': '刪除此自動化？過往執行記錄及其專案將予以保留。',
   'routines.errorPickProject': '請選擇要重複使用的專案，或切換為「每次執行建立新專案」。',
+  'routines.error.agentEmptyOutput':
+    '代理執行完成但未產生任何輸出。模型或服務商可能傳回了空回應——請查看代理日誌以排查上游錯誤。',
 
   'newproj.tabPrototype': '原型',
   'newproj.tabLiveArtifact': '即時成品',
diff --git a/apps/web/src/i18n/types.ts b/apps/web/src/i18n/types.ts
index 967c33ef3..84bd6e377 100644
--- a/apps/web/src/i18n/types.ts
+++ b/apps/web/src/i18n/types.ts
@@ -1279,6 +1279,12 @@ export interface Dict {
   'routines.status.canceled': string;
   'routines.confirmDelete': string;
   'routines.errorPickProject': string;
+  // Routine run failure messages surfaced from the daemon. Each key
+  // corresponds to a well-known daemon-side error string we recognize
+  // and localize in `localizeRoutineError` (apps/web/src/components/
+  // RoutinesSection.tsx). Unknown daemon errors keep their raw string
+  // so untranslated failures still surface, just in English.
+  'routines.error.agentEmptyOutput': string;
   // Bottom-of-rail help menu
   'entry.helpAria': string;
   'entry.helpMenuAria': string;