diff --git a/frontend-web/src/components/workspace/agents/agent-gallery.tsx b/frontend-web/src/components/workspace/agents/agent-gallery.tsx
index 7e2b57c0..6d099a18 100644
--- a/frontend-web/src/components/workspace/agents/agent-gallery.tsx
+++ b/frontend-web/src/components/workspace/agents/agent-gallery.tsx
@@ -74,6 +74,7 @@ export function AgentGallery() {
     agents: mainAgents,
     total: mainTotal,
     isLoading: mainLoading,
+    isFetching: mainFetching,
   } = useAgentsPaginated({
     scope: mainScope,
     search,
@@ -89,6 +90,7 @@ export function AgentGallery() {
     agents: privateAgents,
     total: privateTotal,
     isLoading: isPrivateLoading,
+    isFetching: isPrivateFetching,
     error: privateError,
   } = usePrivateAgentsPaginated(privatePassword, {
     search,
@@ -315,9 +317,16 @@ export function AgentGallery() {
       {/* Tabs */}
       <Tabs
         value={activeTab}
-        onValueChange={(v) =>
-          setActiveTab(v as "all" | "mine" | "private")
-        }
+        onValueChange={(v) => {
+          setActiveTab(v as "all" | "mine" | "private");
+          // Each tab starts from a clean slate: switching tabs clears the
+          // keyword / tag / sort / publisher filters instead of carrying them
+          // over. The TagSearchBar's own input box is reset via its key below.
+          setSearch("");
+          setTagIds([]);
+          setSort("time_desc");
+          setPublisher(null);
+        }}
         className="flex flex-1 flex-col overflow-hidden"
       >
         <div className="mx-6 mt-4 flex flex-col gap-3">
@@ -351,7 +360,11 @@ export function AgentGallery() {
             </div>
           </div>
           <TagSearchBar
+            // Remount per tab so the internal keyword input / 展开 state also
+            // resets when the parent-owned filters are cleared on tab switch.
+            key={activeTab}
             targetType="agent"
+            searching={activeTab === "private" ? isPrivateFetching : mainFetching}
             onSearchChange={setSearch}
             tagIds={tagIds}
             onTagIdsChange={setTagIds}
diff --git a/frontend-web/src/components/workspace/tags/tag-search-bar.tsx b/frontend-web/src/components/workspace/tags/tag-search-bar.tsx
index 399f9d84..c302b8f9 100644
--- a/frontend-web/src/components/workspace/tags/tag-search-bar.tsx
+++ b/frontend-web/src/components/workspace/tags/tag-search-bar.tsx
@@ -1,8 +1,9 @@
 "use client";
 
-import { CheckIcon, ChevronDownIcon, ChevronUpIcon, SearchIcon } from "lucide-react";
+import { CheckIcon, ChevronDownIcon, ChevronUpIcon, Loader2, SearchIcon } from "lucide-react";
 import { useEffect, useRef, useState, type ReactNode } from "react";
 
+import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { useI18n } from "@/core/i18n/hooks";
 import { useTags, type TagType } from "@/core/tags";
@@ -18,27 +19,42 @@ const COLLAPSE_THRESHOLD = 16;
  *
  * The name input is debounced (300ms) before ``onSearchChange`` fires, so the
  * caller can feed the value straight into a server-side query without a
- * request per keystroke.
+ * request per keystroke. Pressing Enter or clicking the 搜索 button flushes the
+ * pending debounce immediately, so users never wait on the timer.
+ *
+ * Pass ``searching`` while a query is in flight to show an inline spinner — it
+ * makes server-side searches feel responsive instead of looking like they kept
+ * the previous results.
  *
  * Tags are rendered inline as a multi-select chip row (instead of a dropdown):
  * "全部" is selected when no tag is picked, and any number of tags can be
  * toggled. Filtering is OR — a resource matches if it carries any picked tag.
- * When there are many tags the row collapses behind a 展开/收起 toggle.
+ * When there are many tags the row collapses behind a 展开/收起 toggle. Pass
+ * ``hideTags`` for resources without tags (e.g. the published-task plaza).
  */
 export function TagSearchBar({
   targetType,
   onSearchChange,
-  tagIds,
+  tagIds = [],
   onTagIdsChange,
   className,
   actions,
+  searching = false,
+  hideTags = false,
+  searchPlaceholder,
 }: {
   targetType: TagType;
   onSearchChange: (value: string) => void;
-  tagIds: string[];
-  onTagIdsChange: (value: string[]) => void;
+  tagIds?: string[];
+  onTagIdsChange?: (value: string[]) => void;
   className?: string;
   actions?: ReactNode;
+  /** Show an inline spinner while the caller's query is fetching. */
+  searching?: boolean;
+  /** Hide the tag chip row for resources that have no tags. */
+  hideTags?: boolean;
+  /** Override the search input placeholder. */
+  searchPlaceholder?: string;
 }) {
   const { t } = useI18n();
   const { data: tags } = useTags(targetType);
@@ -47,11 +63,21 @@ export function TagSearchBar({
   const [expanded, setExpanded] = useState(false);
   const cbRef = useRef(onSearchChange);
   cbRef.current = onSearchChange;
+  // Keep the pending debounce timer so an explicit search (Enter / 搜索 button)
+  // can cancel it and fire immediately instead of racing the 300ms delay.
+  const timerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   useEffect(() => {
-    const id = setTimeout(() => cbRef.current(input.trim()), 300);
-    return () => clearTimeout(id);
+    timerRef.current = setTimeout(() => cbRef.current(input.trim()), 300);
+    return () => {
+      if (timerRef.current) clearTimeout(timerRef.current);
+    };
   }, [input]);
 
+  const flushSearch = () => {
+    if (timerRef.current) clearTimeout(timerRef.current);
+    cbRef.current(input.trim());
+  };
+
   const allTags = tags ?? [];
   const canCollapse = allTags.length > COLLAPSE_THRESHOLD;
   // When collapsed, always keep the selected tags visible so the active
@@ -62,7 +88,7 @@ export function TagSearchBar({
       : allTags;
 
   const toggleTag = (id: string) => {
-    onTagIdsChange(
+    onTagIdsChange?.(
       tagIds.includes(id) ? tagIds.filter((x) => x !== id) : [...tagIds, id],
     );
   };
@@ -75,8 +101,14 @@ export function TagSearchBar({
           <Input
             value={input}
             onChange={(e) => setInput(e.target.value)}
-            placeholder={t.adminTags.searchPlaceholder}
-            className="pl-8"
+            onKeyDown={(e) => {
+              if (e.key === "Enter") {
+                e.preventDefault();
+                flushSearch();
+              }
+            }}
+            placeholder={searchPlaceholder ?? t.adminTags.searchPlaceholder}
+            className={cn("pl-8", searching && "pr-9")}
             name="tag-search"
             // A `type="password"` field elsewhere on the page (e.g. the private
             // square access gate) makes browsers / password managers pick the
@@ -88,7 +120,24 @@ export function TagSearchBar({
             data-lpignore="true"
             data-form-type="other"
           />
+          {searching && (
+            <Loader2 className="text-muted-foreground absolute right-2.5 top-1/2 size-4 -translate-y-1/2 animate-spin" />
+          )}
         </div>
+        <Button
+          type="button"
+          variant="outline"
+          onClick={flushSearch}
+          className="shrink-0 gap-1.5"
+          title="搜索"
+        >
+          {searching ? (
+            <Loader2 className="size-4 animate-spin" />
+          ) : (
+            <SearchIcon className="size-4" />
+          )}
+          搜索
+        </Button>
         {actions && (
           <div className="flex w-full shrink-0 justify-end sm:w-auto">
             {actions}
@@ -96,11 +145,11 @@ export function TagSearchBar({
         )}
       </div>
 
-      {allTags.length > 0 && (
+      {!hideTags && allTags.length > 0 && (
         <div className="flex flex-wrap items-center gap-1.5">
           <button
             type="button"
-            onClick={() => onTagIdsChange([])}
+            onClick={() => onTagIdsChange?.([])}
             className={cn(
               "inline-flex items-center rounded-full border px-3 py-1 text-xs font-medium transition-all",
               tagIds.length === 0
diff --git a/frontend-web/src/core/agents/hooks.ts b/frontend-web/src/core/agents/hooks.ts
index c6685f45..c0698d87 100644
--- a/frontend-web/src/core/agents/hooks.ts
+++ b/frontend-web/src/core/agents/hooks.ts
@@ -94,7 +94,7 @@ export function useAgentsPaginated(params: {
   const tagIds = params.tagIds ?? [];
   const sort = params.sort ?? "time_desc";
   const owner = params.owner ?? "";
-  const { data, isLoading, error } = useQuery({
+  const { data, isLoading, isFetching, error } = useQuery({
     queryKey: [
       "agents",
       "paginated",
@@ -123,6 +123,9 @@ export function useAgentsPaginated(params: {
     agents: data?.agents ?? [],
     total: data?.total ?? 0,
     isLoading,
+    // keepPreviousData keeps isLoading false on subsequent searches; expose
+    // isFetching so callers can show a "searching" indicator on every query.
+    isFetching,
     error,
   };
 }
@@ -305,7 +308,7 @@ export function usePrivateAgentsPaginated(
   const tagIds = params.tagIds ?? [];
   const sort = params.sort ?? "time_desc";
   const owner = params.owner ?? "";
-  const { data, isLoading, error, refetch } = useQuery({
+  const { data, isLoading, isFetching, error, refetch } = useQuery({
     queryKey: [
       "agents",
       "private-square",
@@ -337,6 +340,7 @@ export function usePrivateAgentsPaginated(
     agents: data?.agents ?? [],
     total: data?.total ?? 0,
     isLoading,
+    isFetching,
     error,
     refetch,
   };
diff --git a/frontend-web/src/pages/ScheduledTasksPage.tsx b/frontend-web/src/pages/ScheduledTasksPage.tsx
index da5f0373..ae93d9e7 100644
--- a/frontend-web/src/pages/ScheduledTasksPage.tsx
+++ b/frontend-web/src/pages/ScheduledTasksPage.tsx
@@ -149,13 +149,16 @@ export default function ScheduledTasksPage() {
   const initialTaskId = searchParams.get("task");
   const [search, setSearch] = useState("");
   const [tagIds, setTagIds] = useState<string[]>([]);
+  // Plaza (广场) name search is resolved client-side over the fetched published
+  // list, kept separate from the server-side 我的任务 search above.
+  const [plazaSearch, setPlazaSearch] = useState("");
   // Publisher (创建者) filter for the 我的任务 tab — click a task's 创建者 to keep
   // only that creator's tasks. {id} is creator_user_id; {label} the display name.
   const [publisher, setPublisher] = useState<{ id: string; label: string } | null>(
     null,
   );
   // Name + tag filtering is resolved server-side via the /api/scheduled-tasks query.
-  const { data: tasks = [], isLoading } = useScheduledTasks({ search, tagIds });
+  const { data: tasks = [], isLoading, isFetching } = useScheduledTasks({ search, tagIds });
   const { data: deliveryProfile } = useScheduledTaskDeliveryProfile();
   const { agents } = useAgents();
   const actions = useScheduledTaskActions();
@@ -215,6 +218,24 @@ export default function ScheduledTasksPage() {
         : sortedTasks,
     [sortedTasks, publisher],
   );
+  // Plaza search: filter the fetched published list client-side. Match against
+  // both the raw and desensitized forms so typing what's shown on screen (the
+  // desensitized name) and the underlying text both hit.
+  const visiblePublished = useMemo(() => {
+    const q = plazaSearch.trim().toLowerCase();
+    if (!q) return published;
+    return published.filter((item) =>
+      [
+        item.name,
+        desensitize(item.name),
+        item.prompt_summary,
+        desensitize(item.prompt_summary ?? ""),
+        item.schedule_text,
+        displayUsername(item.creator_email),
+      ].some((field) => (field ?? "").toLowerCase().includes(q)),
+    );
+  }, [published, plazaSearch]);
+
   const selectedTask = sortedTasks.find((task) => task.task_id === selectedTaskId) ?? null;
   const selectedTaskCanEditRuns = !!selectedTask && selectedTask.role !== "subscriber";
   const { data: runs = [], isLoading: runsLoading } = useScheduledTaskRuns(selectedTaskId);
@@ -465,6 +486,16 @@ export default function ScheduledTasksPage() {
                   onSearchChange={setSearch}
                   tagIds={tagIds}
                   onTagIdsChange={setTagIds}
+                  searching={isFetching}
+                />
+              )}
+              {activeTab === "plaza" && (
+                <TagSearchBar
+                  targetType="scheduled_task"
+                  hideTags
+                  onSearchChange={setPlazaSearch}
+                  searching={publishedLoading}
+                  searchPlaceholder="搜索广场任务（名称 / 摘要 / 创建者）"
                 />
               )}
               {activeTab === "mine" && publisher && (
@@ -751,14 +782,19 @@ export default function ScheduledTasksPage() {
                 ) : (
                   <div className="flex flex-col gap-3 p-4 pt-0">
                     {publishedLoading && (
-                      <div className="text-muted-foreground text-sm">正在加载广场任务...</div>
-                    )}
-                    {!publishedLoading && published.length === 0 && (
-                      <div className="text-muted-foreground rounded-md border p-4 text-sm">
-                        广场上还没有发布的任务。
+                      <div className="text-muted-foreground flex items-center gap-2 text-sm">
+                        <Loader2 className="size-4 animate-spin" />
+                        正在加载广场任务...
                       </div>
                     )}
-                    {published.map((item) => {
+                    {!publishedLoading && visiblePublished.length === 0 && (
+                      <div className="text-muted-foreground rounded-md border p-4 text-sm">
+                        {plazaSearch.trim()
+                          ? `没有匹配「${plazaSearch.trim()}」的任务。`
+                          : "广场上还没有发布的任务。"}
+                      </div>
+                    )}
+                    {visiblePublished.map((item) => {
                       const subscribed = tasks.some((t) => t.task_id === item.task_id);
                       return (
                         <div key={item.task_id} className="bg-card rounded-md border p-4">