diff --git a/packages/client/ui-subagent/src/client/SubagentCatalogAction.module.css b/packages/client/ui-subagent/src/client/SubagentCatalogAction.module.css
index 043e149e67..6d788bba1c 100644
--- a/packages/client/ui-subagent/src/client/SubagentCatalogAction.module.css
+++ b/packages/client/ui-subagent/src/client/SubagentCatalogAction.module.css
@@ -55,6 +55,9 @@
   position: relative;
   min-width: 0;
 }
+.menu > .node {
+  margin-left: -8px;
+}
 
 .row {
   position: relative;
@@ -64,7 +67,7 @@
   box-sizing: border-box;
   width: 100%;
   min-height: 50px;
-  padding: 7px 8px 7px 3px;
+  padding: 7px 8px 7px 11px;
   border: 0;
   border-radius: 8px;
   background: transparent;
@@ -76,12 +79,26 @@
   outline: none;
 }
 
-.row:hover,
-.row:focus-visible {
+.row:hover > .clickarea,
+.row:focus-visible > .clickarea {
   background: var(--dsw-alias-interactive-bg-hover);
 }
 
-.row > :global([data-state]) {
+.clickarea {
+  box-sizing: border-box;
+  display: flex;
+  flex: 1;
+  align-self: stretch;
+  align-items: flex-start;
+  gap: 8px;
+  min-width: 0;
+  margin: -7px -8px -7px;
+  padding: 7px 8px;
+  border-radius: 8px;
+}
+
+.row > :global([data-state]),
+.clickarea > :global([data-state]) {
   margin-top: 4px;
 }
 
@@ -154,7 +171,7 @@
 
 .children {
   position: relative;
-  margin-left: 10px;
+  margin-left: 18px;
   padding-left: 4px;
 }
 
@@ -171,6 +188,10 @@
   height: 26px;
 }
 
+.children[aria-busy='true']::before {
+  content: none;
+}
+
 .children > .node::before {
   top: 0;
   bottom: 0;
@@ -179,15 +200,15 @@
 
 .children > .node:last-child::before {
   bottom: auto;
-  height: 25px;
+  height: 17px;
 }
 
 .children > .node > .row::before {
   content: '';
   position: absolute;
-  top: 24px;
+  top: 16px;
   left: -4px;
-  width: 7px;
+  width: 14px;
   border-top: 1px solid var(--dsw-alias-border-l2);
 }
 
diff --git a/packages/client/ui-subagent/src/client/SubagentCatalogAction.tsx b/packages/client/ui-subagent/src/client/SubagentCatalogAction.tsx
index 6c5ad91b9a..ed08856156 100644
--- a/packages/client/ui-subagent/src/client/SubagentCatalogAction.tsx
+++ b/packages/client/ui-subagent/src/client/SubagentCatalogAction.tsx
@@ -118,6 +118,7 @@ function CatalogRows({
         const childCatalog = catalogs[entry.id]
         const isExpanded = expanded.has(entry.id)
         const knownLeaf = !entry.hasChildren
+        const emptyLoading = childCatalog?.state === 'loading' && childCatalog.entries.length === 0
         const summary = summaries[entry.id]
         const label = entry.label ?? entry.id
         const mode = entry.mode === 'one-shot' ? '一次性' : '可继续'
@@ -176,15 +177,21 @@ function CatalogRows({
                     <IconChevronRightOutline14 />
                   </button>
                 )}
-              <StateDot state={entry.activity === 'running' ? 'ongoing' : 'done'} />
-              <span className={css.content}>
-                <span className={css.label}>{label}</span>
-                <span className={css.summary}>{secondary}</span>
-              </span>
-              {time !== undefined && <span className={css.time}>{time}</span>}
+              <div className={css.clickarea}>
+                <StateDot state={entry.activity === 'running' ? 'ongoing' : 'done'} />
+                <span className={css.content}>
+                  <span className={css.label}>{label}</span>
+                  <span className={css.summary}>{secondary}</span>
+                </span>
+                {time !== undefined && <span className={css.time}>{time}</span>}
+              </div>
             </div>
             {isExpanded && childCatalog !== undefined && !knownLeaf && (
-              <div role="group" className={css.children}>
+              <div
+                role="group"
+                className={css.children}
+                aria-busy={emptyLoading || undefined}
+              >
                 <CatalogRows
                   parentSessionId={entry.id}
                   catalog={childCatalog}
diff --git a/packages/client/ui-subagent/tests/conversation-ui.spec.tsx b/packages/client/ui-subagent/tests/conversation-ui.spec.tsx
index 88fceed8d0..6aec4c77a7 100644
--- a/packages/client/ui-subagent/tests/conversation-ui.spec.tsx
+++ b/packages/client/ui-subagent/tests/conversation-ui.spec.tsx
@@ -237,6 +237,31 @@ describe('SubagentCatalogAction', () => {
     expect(input.setCatalogOpen).toHaveBeenCalledWith(CHILD, false)
   })
 
+  it('shows initial descendant loading status without drawing its branch', () => {
+    const loading = props(catalog(), {
+      [CHILD]: catalog({ entries: [], state: 'loading' }),
+    })
+    const view = render(<SubagentCatalogAction {...loading} />)
+    fireEvent.click(screen.getByRole('button', { name: /2 个子代理/ }))
+    fireEvent.click(screen.getByRole('button', { name: '展开 worker 的下级子代理' }))
+
+    expect(loading.setCatalogOpen).toHaveBeenCalledWith(CHILD, true)
+    expect(screen.getByRole('group').getAttribute('aria-busy')).toBe('true')
+    expect(screen.getByText('正在加载子代理…')).toBeTruthy()
+
+    const ready = props(catalog(), {
+      [CHILD]: catalog({
+        entries: [{
+          kind: 'child', id: GRANDCHILD, mode: 'continuable',
+          label: 'indexer', activity: 'inactive', hasChildren: false,
+        }],
+      }),
+    })
+    view.rerender(<SubagentCatalogAction {...ready} />)
+    expect(screen.getByRole('group').getAttribute('aria-busy')).toBeNull()
+    expect(screen.getByRole('treeitem', { name: /indexer/ })).toBeTruthy()
+  })
+
   it('uses ArrowRight and ArrowLeft for branch disclosure', async () => {
     const input = props(catalog(), {
       [CHILD]: catalog({