diff --git a/apps/web/src/components/chat/MessagesTimeline.browser.test.tsx b/apps/web/src/components/chat/MessagesTimeline.browser.test.tsx
index 0ca1f46f5d7ea..fad8dae5e869b 100644
--- a/apps/web/src/components/chat/MessagesTimeline.browser.test.tsx
+++ b/apps/web/src/components/chat/MessagesTimeline.browser.test.tsx
@@ -2,7 +2,7 @@ import { injectHtmlRenderBootstrap } from "@t3tools/shared/htmlRender";
 import { HtmlRenderDocument } from "../files/BrowserDocumentFrame";
 import { flushSync } from "react-dom";
 import { AudioPreview } from "../files/AudioPreview";
-import { cdp, page } from "vite-plus/test/browser";
+import { cdp, page, userEvent } from "vite-plus/test/browser";
 import {
   ComposerContextId,
   EnvironmentId,
@@ -434,6 +434,70 @@ describe("MessagesTimeline work rows", () => {
       }
     },
   );
+
+  it("opens adjacent subagent previews without repeating the hover delay", async () => {
+    setup();
+    const now = DateTime.makeUnsafe(CREATED_AT);
+    const task = (id: string, title: string): OrchestrationV2Subagent => ({
+      id: NodeId.make(id),
+      threadId: ThreadId.make("thread-1"),
+      runId: null,
+      parentNodeId: NodeId.make("parent-root"),
+      origin: "app_owned",
+      createdBy: "agent",
+      driver: ProviderDriverKind.make("claudeAgent"),
+      providerInstanceId: ProviderInstanceId.make("claudeAgent"),
+      providerThreadId: null,
+      childThreadId: ThreadId.make(`child-${id}`),
+      nativeTaskRef: null,
+      prompt: title,
+      title,
+      model: null,
+      status: "completed",
+      result: `${title} result`,
+      startedAt: now,
+      completedAt: now,
+      updatedAt: now,
+    });
+    const tasks = [task("first", "Review parser"), task("second", "Review renderer")];
+    using _threadAtom = vi.spyOn(environmentThreadDetails, "threadAtom").mockReturnValue(
+      Atom.make({
+        projection: { subagents: tasks, turnItems: [], visibleTurnItems: [] },
+      }) as never,
+    );
+    await using screen = await renderTimeline(
+      tasks.map((agent) =>
+        work(`notification-${agent.id}`, {
+          label: "Notification fallback",
+          tone: "info",
+          itemType: "notification",
+          projectedItem: v2Item("notification", {
+            id: `notification-${agent.id}`,
+            source: {
+              kind: "delegated_task",
+              childThreadId: agent.childThreadId!,
+              taskIds: [agent.id],
+            },
+            outcome: "completed",
+            summary: "Notification fallback",
+          }),
+        }),
+      ),
+    );
+    const openPopup = (title: string) => {
+      const popup = [...document.querySelectorAll('[data-slot="tooltip-popup"][data-open]')].find(
+        (element) => element.textContent?.includes(title),
+      );
+      if (!popup) throw new Error(`No open preview for ${title}`);
+      return popup;
+    };
+    await userEvent.hover(screen.button("Open Review parser"));
+    await vi.waitFor(() => openPopup("Review parser"));
+    await userEvent.hover(screen.button("Open Review renderer"));
+    const popup = await vi.waitFor(() => openPopup("Review renderer"));
+    // Base UI marks a popup that a Tooltip.Provider group opened without its delay.
+    expect(popup.getAttribute("data-instant")).toBe("delay");
+  });
 });
 
 describe("MessagesTimeline messages", () => {
diff --git a/apps/web/src/components/chat/MessagesTimeline.tsx b/apps/web/src/components/chat/MessagesTimeline.tsx
index 3b8db4484132d..6f4c699ce55ac 100644
--- a/apps/web/src/components/chat/MessagesTimeline.tsx
+++ b/apps/web/src/components/chat/MessagesTimeline.tsx
@@ -90,7 +90,7 @@ import {
 } from "./MessagesTimeline.logic";
 import { type ThreadFindMatch } from "./threadFind";
 import { useThreadFindNavigation } from "./useThreadFindNavigation";
-import { TooltipScrollDismissArea } from "../ui/tooltip";
+import { TooltipProvider, TooltipScrollDismissArea } from "../ui/tooltip";
 import { WorktreeSetupCard } from "./WorktreeSetupCard";
 import { useOpenPrLink } from "~/lib/openPullRequestLink";
 import { useMediaQuery } from "~/hooks/useMediaQuery";
@@ -1293,82 +1293,84 @@ const ConversationTimeline = memo(function ConversationTimeline({
       {activityAnnouncer}
       <MarkdownFindContext value={findActive}>
         <TimelineRowActivityCtx value={activityState}>
-          <TooltipScrollDismissArea
-            ref={attachTimelineViewportElement}
-            className="relative h-full min-h-0"
-            data-assistant-citation-viewport="true"
-          >
-            {onCiteAssistantText && citationThreadRef ? (
-              <AssistantSelectionToolbar
-                viewport={timelineViewportElement}
-                threadRef={citationThreadRef}
-                onCite={onCiteAssistantText}
+          <TooltipProvider>
+            <TooltipScrollDismissArea
+              ref={attachTimelineViewportElement}
+              className="relative h-full min-h-0"
+              data-assistant-citation-viewport="true"
+            >
+              {onCiteAssistantText && citationThreadRef ? (
+                <AssistantSelectionToolbar
+                  viewport={timelineViewportElement}
+                  threadRef={citationThreadRef}
+                  onCite={onCiteAssistantText}
+                />
+              ) : null}
+              <LegendList<MessagesTimelineRow>
+                ref={setTimelineList}
+                data={rows}
+                extraData={listExtraData}
+                keyExtractor={keyExtractor}
+                getItemType={getItemType}
+                renderItem={renderItem}
+                estimatedItemSize={90}
+                initialScrollAtEnd={
+                  !findActive && citationRequest === null && rememberedPosition?.atEnd !== false
+                }
+                // Legend needs a data refresh to mount new pins without a scroll event.
+                dataVersion={`${readyCitationRequest?.key ?? listIdentityKey}:${alwaysRenderKeys.join(",")}`}
+                {...(alwaysRender ? { alwaysRender } : {})}
+                onLoad={handleListLoad}
+                {...(anchoredEndSpace ? { anchoredEndSpace } : {})}
+                contentInsetEndAdjustment={anchoredEndSpace ? contentInsetEndAdjustment : 0}
+                maintainScrollAtEnd={
+                  citationPositioning ||
+                  (restoringThreadPosition && rememberedPosition?.atEnd === false) ||
+                  anchoredEndSpace ||
+                  !liveFollowEnabled ||
+                  fullscreenAppRowId !== null
+                    ? false
+                    : isWorking && !prefersReducedMotion && settlingListIdentity === null
+                      ? TIMELINE_MAINTAIN_SCROLL_AT_END_SMOOTH
+                      : TIMELINE_MAINTAIN_SCROLL_AT_END
+                }
+                maintainVisibleContentPosition={
+                  findActive ||
+                  citationPositioning ||
+                  (restoringThreadPosition && rememberedPosition?.atEnd === false)
+                    ? false
+                    : maintainVisibleContentPosition
+                }
+                maintainScrollAtEndThreshold={1}
+                onScroll={handleScroll}
+                onItemSizeChanged={scheduleMinimapRefresh}
+                onMetricsChange={scheduleMinimapRefresh}
+                className={cn(
+                  "messages-timeline-scroll scrollbar-gutter-both h-full min-h-0 overflow-x-hidden overscroll-y-contain [overflow-anchor:none]",
+                  topFadeEnabled && "topbar-scroll-fade",
+                )}
+                ListHeaderComponent={listHeader}
+                ListFooterComponent={timelineListFooter}
               />
-            ) : null}
-            <LegendList<MessagesTimelineRow>
-              ref={setTimelineList}
-              data={rows}
-              extraData={listExtraData}
-              keyExtractor={keyExtractor}
-              getItemType={getItemType}
-              renderItem={renderItem}
-              estimatedItemSize={90}
-              initialScrollAtEnd={
-                !findActive && citationRequest === null && rememberedPosition?.atEnd !== false
-              }
-              // Legend needs a data refresh to mount new pins without a scroll event.
-              dataVersion={`${readyCitationRequest?.key ?? listIdentityKey}:${alwaysRenderKeys.join(",")}`}
-              {...(alwaysRender ? { alwaysRender } : {})}
-              onLoad={handleListLoad}
-              {...(anchoredEndSpace ? { anchoredEndSpace } : {})}
-              contentInsetEndAdjustment={anchoredEndSpace ? contentInsetEndAdjustment : 0}
-              maintainScrollAtEnd={
-                citationPositioning ||
-                (restoringThreadPosition && rememberedPosition?.atEnd === false) ||
-                anchoredEndSpace ||
-                !liveFollowEnabled ||
-                fullscreenAppRowId !== null
-                  ? false
-                  : isWorking && !prefersReducedMotion && settlingListIdentity === null
-                    ? TIMELINE_MAINTAIN_SCROLL_AT_END_SMOOTH
-                    : TIMELINE_MAINTAIN_SCROLL_AT_END
-              }
-              maintainVisibleContentPosition={
-                findActive ||
-                citationPositioning ||
-                (restoringThreadPosition && rememberedPosition?.atEnd === false)
-                  ? false
-                  : maintainVisibleContentPosition
-              }
-              maintainScrollAtEndThreshold={1}
-              onScroll={handleScroll}
-              onItemSizeChanged={scheduleMinimapRefresh}
-              onMetricsChange={scheduleMinimapRefresh}
-              className={cn(
-                "messages-timeline-scroll scrollbar-gutter-both h-full min-h-0 overflow-x-hidden overscroll-y-contain [overflow-anchor:none]",
-                topFadeEnabled && "topbar-scroll-fade",
-              )}
-              ListHeaderComponent={listHeader}
-              ListFooterComponent={timelineListFooter}
-            />
-            <TimelineMinimap
-              items={minimapItems}
-              hasPersistentGutter={minimapHasPersistentGutter}
-              hitStripWidth={minimapHitStripWidth}
-              currentIndex={minimapCurrentIndex}
-              atEnd={minimapAtEnd}
-              stripMap={minimapStripMap}
-              onWheel={forwardMinimapWheel}
-              onSelect={(item) => {
-                navigateTimeline();
-                void listRef.current?.scrollToIndex({
-                  index: item.rowIndex,
-                  animated: !window.matchMedia("(prefers-reduced-motion: reduce)").matches,
-                  viewOffset: 24,
-                });
-              }}
-            />
-          </TooltipScrollDismissArea>
+              <TimelineMinimap
+                items={minimapItems}
+                hasPersistentGutter={minimapHasPersistentGutter}
+                hitStripWidth={minimapHitStripWidth}
+                currentIndex={minimapCurrentIndex}
+                atEnd={minimapAtEnd}
+                stripMap={minimapStripMap}
+                onWheel={forwardMinimapWheel}
+                onSelect={(item) => {
+                  navigateTimeline();
+                  void listRef.current?.scrollToIndex({
+                    index: item.rowIndex,
+                    animated: !window.matchMedia("(prefers-reduced-motion: reduce)").matches,
+                    viewOffset: 24,
+                  });
+                }}
+              />
+            </TooltipScrollDismissArea>
+          </TooltipProvider>
         </TimelineRowActivityCtx>
       </MarkdownFindContext>
     </>
diff --git a/apps/web/src/components/chat/ThreadRelationshipsControl.tsx b/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
index 102d9734ded92..753552b9be311 100644
--- a/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
+++ b/apps/web/src/components/chat/ThreadRelationshipsControl.tsx
@@ -84,7 +84,7 @@ import { ThreadLineageWorkflowRow } from "./ThreadLineageWorkflowRow";
 import { openSideChatTab } from "../../lib/sideChatPane";
 
 import { Menu, MenuItem, MenuPopup, MenuTrigger } from "../ui/menu";
-import { Tooltip, TooltipPopup, TooltipTrigger } from "../ui/tooltip";
+import { Tooltip, TooltipPopup, TooltipProvider, TooltipTrigger } from "../ui/tooltip";
 import { toastManager } from "../ui/toast";
 import { Spinner } from "../ui/spinner";
 import { cn } from "~/lib/utils";
@@ -941,7 +941,7 @@ export function ThreadRelationshipsPanel(props: {
   };
 
   return (
-    <>
+    <TooltipProvider>
       {lineageVisible ? (
         <ThreadDetailsSection
           headingId="thread-details-lineage-heading"
@@ -1028,6 +1028,6 @@ export function ThreadRelationshipsPanel(props: {
           </ThreadLineageGroup>
         </ThreadDetailsSection>
       ) : null}
-    </>
+    </TooltipProvider>
   );
 }