diff --git a/scripts/test-chat-clear-confirmation.cjs b/scripts/test-chat-clear-confirmation.cjs
index 3975982..bd8292e 100644
--- a/scripts/test-chat-clear-confirmation.cjs
+++ b/scripts/test-chat-clear-confirmation.cjs
@@ -27,8 +27,10 @@ function elements(root, predicate) {
 
 function setup(overrides = {}) {
   const state = []
+  const effects = []
   let index = 0
   let cleared = 0
+  const modeChanges = []
   const panel = compile('../src/renderer/src/features/workspace/WorkspaceQaPanel.tsx', {
     '../../i18n': i18n,
     '../../components/AppStatusModals': { ConfirmStatusModal },
@@ -36,7 +38,7 @@ function setup(overrides = {}) {
     'react-dom': { createPortal: child => child },
     react: {
       ...React,
-      useEffect() {},
+      useEffect(effect) { effects.push(effect) },
       useState(initial) {
         const slot = index++
         if (!(slot in state)) state[slot] = initial
@@ -45,13 +47,16 @@ function setup(overrides = {}) {
     }
   }, { document: { body: {} } }).default
   const props = {
-    dark: true, workspaceActive: true, qaMode: 'ai', visibleAiMessages: [{ id: '1', content: 'hello' }],
+    dark: true, workspaceActive: true, qaMode: 'ai', agentEnabled: true, visibleAiMessages: [{ id: '1', content: 'hello' }],
     visibleTeacherMessages: [], agentMessages: [], workspaceChatScrollRef: { current: null },
+    onModeChange(mode) { modeChanges.push(mode) },
     onClearConversation() { cleared++ }, ...overrides
   }
   return {
-    render() { index = 0; return panel(props) },
-    cleared: () => cleared
+    render() { index = 0; effects.length = 0; return panel(props) },
+    cleared: () => cleared,
+    runEffects() { effects.forEach(effect => effect()) },
+    modeChanges
   }
 }
 
@@ -113,3 +118,30 @@ test('input no longer opens a native confirmation dialog', () => {
   assert.doesNotMatch(source, /window\.confirm/)
   assert.match(source, /onClick=\{onClearConversation\}/)
 })
+
+for (const dark of [false, true]) {
+  for (const agentEnabled of [false, true]) {
+    test(`agent availability controls tab count and layout (${dark ? 'dark' : 'light'}, enabled=${agentEnabled})`, () => {
+      const harness = setup({ dark, agentEnabled })
+      const grids = elements(harness.render(), node => node.props.className?.includes('mt-3 grid'))
+      assert.equal(grids.length, 1)
+      const tabs = elements(grids[0], node => node.type === 'button')
+      assert.deepEqual(tabs.map(tab => tab.props.children[1].props.children), agentEnabled ? ['AI', '에이전트', '강사'] : ['AI', '강사'])
+      assert.ok(grids[0].props.className.includes(agentEnabled ? 'grid-cols-3' : 'grid-cols-2'))
+    })
+  }
+}
+
+test('returns to AI when the selected agent is disabled after status loading', () => {
+  const harness = setup({ qaMode: 'agent', agentEnabled: false, agentStatusLoading: false, minimized: true })
+  harness.render()
+  harness.runEffects()
+  assert.deepEqual(harness.modeChanges, ['ai'])
+})
+
+test('does not reset the selected agent while status is still loading', () => {
+  const harness = setup({ qaMode: 'agent', agentEnabled: false, agentStatusLoading: true, minimized: true })
+  harness.render()
+  harness.runEffects()
+  assert.deepEqual(harness.modeChanges, [])
+})
diff --git a/src/renderer/src/features/workspace/WorkspaceQaPanel.tsx b/src/renderer/src/features/workspace/WorkspaceQaPanel.tsx
index 3cb85b3..ffe6abf 100644
--- a/src/renderer/src/features/workspace/WorkspaceQaPanel.tsx
+++ b/src/renderer/src/features/workspace/WorkspaceQaPanel.tsx
@@ -142,8 +142,10 @@ export default function WorkspaceQaPanel({
   }
 
   useEffect(() => {
-    if (teacherQaDisabled && qaMode === 'teacher') onModeChange('ai')
-  }, [onModeChange, qaMode, teacherQaDisabled])
+    if ((teacherQaDisabled && qaMode === 'teacher') || (!agentStatusLoading && !agentEnabled && qaMode === 'agent')) {
+      onModeChange('ai')
+    }
+  }, [agentEnabled, agentStatusLoading, onModeChange, qaMode, teacherQaDisabled])
 
   useEffect(() => {
     if (!contextMenu) return
@@ -228,12 +230,12 @@ export default function WorkspaceQaPanel({
             <span className={['pointer-events-none absolute right-0 top-8 z-50 hidden whitespace-nowrap rounded-md border px-2 py-1 text-[11px] font-semibold shadow-[0_10px_24px_rgba(0,0,0,0.24)] group-hover:block', dark ? 'border-white/10 bg-[#303030] text-white/78' : 'border-[#d8dee9] bg-white text-[#4f596b]'].join(' ')}>{t("최소화")}</span>
           </button>
         </div>
-        <div className={['mt-3 grid grid-cols-3 overflow-hidden rounded-md border', borderSoft].join(' ')}>
+        <div className={['mt-3 grid overflow-hidden rounded-md border', agentEnabled ? 'grid-cols-3' : 'grid-cols-2', borderSoft].join(' ')}>
           {[
             { id: 'ai' as const, label: 'AI', Icon: Bot },
             { id: 'agent' as const, label: t("에이전트"), Icon: WandSparkles },
             { id: 'teacher' as const, label: t("강사"), Icon: User }
-          ].map(({ id, label, Icon }) => {
+          ].filter(({ id }) => id !== 'agent' || agentEnabled).map(({ id, label, Icon }) => {
             const disabled = id === 'teacher' && teacherQaDisabled
             const teacherTabFlash = id === 'teacher' && teacherChatFlash && !minimized && qaMode === 'ai'