diff --git a/apps/web/tests/present.e2e.ts b/apps/web/tests/present.e2e.ts
index fb23c2db8e..4df8bfae81 100644
--- a/apps/web/tests/present.e2e.ts
+++ b/apps/web/tests/present.e2e.ts
@@ -132,6 +132,18 @@ fs.appendFileSync(${JSON.stringify(openLog)}, JSON.stringify({ path, action, con
       await row.waitFor()
       await expect.poll(() => row.getByRole('button', { name: 'More ways to open' }).count()).toBe(2)
       expect(await row.getByText('report.txt', { exact: true }).innerText()).toBe('report.txt')
+      const card = row.locator('[data-presented-file]').filter({ hasText: 'report.txt' })
+      await card.getByRole('button', { name: 'Open in Test Editor', exact: true }).hover()
+      await page.getByRole('tooltip', { name: 'Open in Test Editor', exact: true }).waitFor()
+      expect(await page.getByRole('tooltip').evaluate((tooltip) => {
+        const rect = tooltip.getBoundingClientRect()
+        const previous = tooltip.style.pointerEvents
+        tooltip.style.pointerEvents = 'auto'
+        const visible = document.elementFromPoint(rect.left + rect.width / 2, rect.bottom - 1) === tooltip
+        tooltip.style.pointerEvents = previous
+        return tooltip.parentElement === document.body && visible
+      })).toBe(true)
+      await page.mouse.move(0, 0)
       const beforePreview = (await opened()).length
       const column = page.locator('[data-rightbar-col]')
       for (const [name, content] of [['report.txt', 'EDITED_REPORT'], ['说明.txt', 'EDITED_NOTE']] as const) {
diff --git a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
index e9284d9293..8cc56c74e5 100644
--- a/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
+++ b/packages/client/ui-open-in-app/src/client/OpenTargetButton.tsx
@@ -113,7 +113,7 @@ export function OpenTargetButton(props: OpenTargetButtonProps): ReactNode {
         anchor={(
           <div className={css.split} data-open-target={kind} data-size={props.prominent ? 'large' : 'compact'}
             data-open-path={kind === 'file' && !props.prominent ? '' : undefined} data-state={disabled ? 'busy' : 'idle'}>
-            <Tooltip label={primaryLabel} side="bottom" delayMs={500}>
+            <Tooltip portal label={primaryLabel} side="bottom" delayMs={500}>
               <button type="button" className={css.main} disabled={disabled} aria-label={props.prominent ? undefined : primaryLabel}
                 data-open-path-open={kind === 'file' && !props.prominent ? '' : undefined}
                 data-open-path-unpreviewable={props.prominent ? '' : undefined} onClick={primary}>
diff --git a/packages/client/ui-primitives/README.i18n.yaml b/packages/client/ui-primitives/README.i18n.yaml
index 8d8279ffea..63f085ac64 100644
--- a/packages/client/ui-primitives/README.i18n.yaml
+++ b/packages/client/ui-primitives/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-primitives/README.md
-README.md: 4bc5d53f1fde5ac65015ef023134b163b351797f
-README.zh.md: 481a84150f480c87568a91af0311a3d4fcf2c637
+README.md: 5ea78f223e848effb566605eefa7be75c3a3ba9b
+README.zh.md: 78cc45d60b8642b41bc33bd1ed0c9a1d7bf78cdf
diff --git a/packages/client/ui-primitives/README.md b/packages/client/ui-primitives/README.md
index 4bc5d53f1f..5ea78f223e 100644
--- a/packages/client/ui-primitives/README.md
+++ b/packages/client/ui-primitives/README.md
@@ -49,7 +49,7 @@ Check this table before writing a control in a feature package. A plugin cannot
 | `Modal` | Centered dialog over a page mask. |
 | `RiskConfirmation` | Sensitive action gated behind an explicit checkbox. |
 | `OnboardingSurface` | First-run stage that holds the application root inert. |
-| `Tooltip` | Hover text on a cloned anchor, placed right, bottom, or top. |
+| `Tooltip` | Hover text anchored to a cloned child; optional `portal` rendering escapes clipping containers. |
 | `HoverCard` | Hover preview the pointer can rest on and select from; optional copy button. |
 | `Toast` | Transient top-center banner held for the owner's `holdMs`. |
 | `JsonTree`, `JsonBlock` | Read-only JSON inspection. |
diff --git a/packages/client/ui-primitives/README.zh.md b/packages/client/ui-primitives/README.zh.md
index 481a84150f..78cc45d60b 100644
--- a/packages/client/ui-primitives/README.zh.md
+++ b/packages/client/ui-primitives/README.zh.md
@@ -49,7 +49,7 @@ kind: "package-library"
 | `Modal` | 页面遮罩之上的居中对话框。 |
 | `RiskConfirmation` | 以显式复选框把关的敏感操作确认。 |
 | `OnboardingSurface` | 首次运行的引导舞台，期间保持应用根节点 inert。 |
-| `Tooltip` | 克隆锚点上的悬停文本，可置于右、下、上三个方向。 |
+| `Tooltip` | 锚定在克隆子元素上的悬停文本；可通过 `portal` 渲染到外层，避免被容器裁剪。 |
 | `HoverCard` | 指针可停留、可选中的悬停预览；可选带复制按钮。 |
 | `Toast` | 顶部居中的瞬时横幅，保持时长由所有者的 `holdMs` 决定。 |
 | `JsonTree`、`JsonBlock` | 只读 JSON 查看。 |
diff --git a/packages/client/ui-primitives/src/Tooltip.module.css b/packages/client/ui-primitives/src/Tooltip.module.css
index 926fb68557..ed546ce13c 100644
--- a/packages/client/ui-primitives/src/Tooltip.module.css
+++ b/packages/client/ui-primitives/src/Tooltip.module.css
@@ -19,6 +19,8 @@
   animation: tooltip-in 150ms var(--ds-ease-in-out);
 }
 
+.bubble[data-portal] { z-index: 1100; }
+
 .bubble[data-side='right'] {
   transform: translateY(-50%);
 }
diff --git a/packages/client/ui-primitives/src/Tooltip.tsx b/packages/client/ui-primitives/src/Tooltip.tsx
index 688a411fb9..0316840a25 100644
--- a/packages/client/ui-primitives/src/Tooltip.tsx
+++ b/packages/client/ui-primitives/src/Tooltip.tsx
@@ -1,8 +1,8 @@
-// Cloning the anchor preserves its layout context. Fixed positioning lets the
-// bubble escape ancestor overflow clipping without a portal.
+/** Anchor-preserving tooltips with optional body portals for clipping containers. */
 
 import { cloneElement, createContext, useCallback, useContext, useEffect, useLayoutEffect, useRef, useState } from 'react'
 import type { FocusEventHandler, MouseEventHandler, MutableRefObject, ReactElement, Ref } from 'react'
+import { createPortal } from 'react-dom'
 import css from './Tooltip.module.css'
 
 /** Bubble placement relative to the anchor. */
@@ -46,17 +46,18 @@ if (typeof window !== 'undefined') {
  * @param props.align - horizontal anchor-edge alignment for 'bottom'/'top' bubbles: 'end' pins
  * the bubble's right edge to the anchor's (for anchors beside other hover surfaces the centered
  * bubble would overlap); default 'center'. Ignored for side 'right'.
+ * @param props.portal - render the bubble under document.body to escape containing blocks and clipping ancestors.
  * @param props.delayMs - hover delay in milliseconds; keyboard focus remains immediate.
  * @param props.disabled - suppress the bubble while true; the anchor renders identically so
  * toggling never remounts it (which would cut its CSS transitions).
  * @param props.maxWidth - bubble width cap in pixels, for labels long enough that the default
  * half-viewport cap would render a slab wider than the surface the anchor sits on.
  * @param props.children - a single anchor element; its own ref (callback or object) is forwarded alongside the tooltip's.
- * @returns the cloned anchor plus a fixed-position bubble while hovered/focused; clicking the
+ * @returns the cloned anchor plus a fixed-position bubble, optionally portaled to the body; clicking the
  * anchor dismisses the bubble until the next trigger, and focus arriving after a pointer
  * interaction (a closing menu refocusing its trigger) never raises it.
  */
-export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0, disabled = false, maxWidth, children }: { label: TooltipLabel; side?: TooltipSide; align?: 'center' | 'end'; delayMs?: number; disabled?: boolean; maxWidth?: number; children: ReactElement<AnchorProps> }) {
+export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0, disabled = false, portal = false, maxWidth, children }: { label: TooltipLabel; side?: TooltipSide; align?: 'center' | 'end'; delayMs?: number; disabled?: boolean; portal?: boolean; maxWidth?: number; children: ReactElement<AnchorProps> }) {
   const anchor = useRef<HTMLElement | null>(null)
   // React 18 keeps the element's ref outside props; forward it so wrapping an
   // anchor in Tooltip never silently severs the owner's ref.
@@ -184,6 +185,20 @@ export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0,
     if (!triggers.current.hover && !triggers.current.focus) withdraw()
   }
 
+  const content = visible && !suppressed && (
+    <span
+      ref={bubble}
+      className={css.bubble}
+      data-side={placement}
+      data-portal={portal || undefined}
+      data-align={align}
+      style={{ left: pos.x, top: y, ...maxWidth === undefined ? {} : { maxWidth } }}
+      role="tooltip"
+    >
+      {resolvedLabel}
+    </span>
+  )
+
   return (
     <TooltipSuppression.Provider value={setSuppressed}>
       {cloneElement(children, {
@@ -197,18 +212,7 @@ export function Tooltip({ label, side = 'right', align = 'center', delayMs = 0,
         onFocus: (e) => { children.props.onFocus?.(e); if (pointerModality) return; triggers.current.focus = true; cancelShow(); show() },
         onBlur: (e) => { children.props.onBlur?.(e); triggers.current.focus = false; hide() },
       })}
-      {visible && !suppressed && (
-        <span
-          ref={bubble}
-          className={css.bubble}
-          data-side={placement}
-          data-align={align}
-          style={{ left: pos.x, top: y, ...maxWidth === undefined ? {} : { maxWidth } }}
-          role="tooltip"
-        >
-          {resolvedLabel}
-        </span>
-      )}
+      {portal ? (content !== false && createPortal(content, document.body)) : content}
     </TooltipSuppression.Provider>
   )
 }
diff --git a/packages/client/ui-primitives/tests/tooltip.client.spec.tsx b/packages/client/ui-primitives/tests/tooltip.client.spec.tsx
index 3f1c4f059c..5d6633c387 100644
--- a/packages/client/ui-primitives/tests/tooltip.client.spec.tsx
+++ b/packages/client/ui-primitives/tests/tooltip.client.spec.tsx
@@ -466,3 +466,18 @@ describe('Tooltip', () => {
     expect(screen.getByRole('tooltip').textContent).toBe('Open sidebar')
   })
 })
+
+
+it('keeps the anchor in its clipping container and portals only the tooltip', () => {
+  const view = render(<div style={{ overflow: 'hidden', contain: 'layout' }}>
+    <Tooltip portal label="Open in Music" side="bottom"><button type="button">File action</button></Tooltip>
+  </div>)
+  const anchor = screen.getByRole('button', { name: 'File action' })
+  fireEvent.mouseEnter(anchor)
+  const tooltip = screen.getByRole('tooltip')
+  expect(tooltip.parentElement).toBe(document.body)
+  expect(view.container.contains(anchor)).toBe(true)
+  expect(view.container.contains(tooltip)).toBe(false)
+  view.unmount()
+  expect(screen.queryByRole('tooltip')).toBeNull()
+})