diff --git a/packages/client/ui-chat/src/client/chat/ReasoningRow.tsx b/packages/client/ui-chat/src/client/chat/ReasoningRow.tsx
index 81b10a7c49..bc7859b364 100644
--- a/packages/client/ui-chat/src/client/chat/ReasoningRow.tsx
+++ b/packages/client/ui-chat/src/client/chat/ReasoningRow.tsx
@@ -17,7 +17,9 @@ function latestLine(text: string): string {
 }
 
 /**
- * Render one assistant reasoning block as the Think disclosure row.
+ * Render one assistant reasoning block as the Think disclosure row. The
+ * collapsed summary omits double-asterisk markers; expanded content preserves
+ * the complete text.
  * @param props.text - complete or streaming reasoning text.
  * @param props.running - whether this block is the streaming tail.
  * @param props.t - conversation locale seat for the running status.
@@ -25,7 +27,7 @@ function latestLine(text: string): string {
  */
 export function ReasoningRow({ text, running, t }: { text: string; running: boolean; t: ChatViewSlotProps['t'] }) {
   const [expanded, setExpanded] = useState(false)
-  const summary = running ? latestLine(text) : firstLine(text)
+  const summary = (running ? latestLine(text) : firstLine(text)).replaceAll('**', '')
 
   return (
     <div
diff --git a/packages/client/ui-chat/tests/reasoning-row.client.spec.tsx b/packages/client/ui-chat/tests/reasoning-row.client.spec.tsx
index 4b32f77119..439b79bc7a 100644
--- a/packages/client/ui-chat/tests/reasoning-row.client.spec.tsx
+++ b/packages/client/ui-chat/tests/reasoning-row.client.spec.tsx
@@ -70,6 +70,34 @@ describe('ReasoningRow', () => {
     expect(row.getAttribute('aria-expanded')).toBe('false')
   })
 
+  it.each([
+    {
+      label: 'settled',
+      text: '**Comparing checkout and merge bases**\nKeep **reviewing**',
+      streaming: false,
+    },
+    {
+      label: 'streaming',
+      text: 'Inspect the session\n**Comparing checkout and merge bases**',
+      streaming: true,
+    },
+  ])('strips double-asterisk markers from the $label summary without changing the reasoning body', ({ text, streaming }) => {
+    const view = render(
+      <AssistantMarkdown
+        t={t}
+        blocks={[{ kind: 'reasoning', text }]}
+        streaming={streaming}
+        renderMessageImages={renderMessageImages}
+      />,
+    )
+
+    expect(view.getByText('Comparing checkout and merge bases')).toBeTruthy()
+    expect(view.queryByText('**Comparing checkout and merge bases**')).toBeNull()
+
+    fireEvent.click(view.getByText('思考'))
+    expect(view.container.querySelector('[class*="thinkBody"]')?.textContent).toBe(text)
+  })
+
   it('expanded Think drops the inline summary and renders plain prose, no IN card', () => {
     const view = render(
       <AssistantMarkdown