diff --git a/src/main/services/VoiceModeService.ts b/src/main/services/VoiceModeService.ts
index 00f52cd..7541ed7 100644
--- a/src/main/services/VoiceModeService.ts
+++ b/src/main/services/VoiceModeService.ts
@@ -468,9 +468,27 @@ class VoiceModeService extends EventEmitter {
       const llm = getLocalLLMService()
       const action = configGet('defaultLLMAction')
 
-      logger.info(`Processing with LLM (action: ${action})`)
+      let processedText: string
 
-      const processedText = await llm.processText(transcribedText, action)
+      if (action === 'custom') {
+        // 활성 명령어의 프롬프트를 사용
+        const activeId = configGet('activeInstructionId' as keyof import('@shared/types').AppConfig) as unknown as string
+        let customPrompt = transcribedText
+
+        if (activeId) {
+          const { getCustomInstructionService } = await import('./CustomInstructionService')
+          const instruction = getCustomInstructionService().getById(activeId)
+          if (instruction) {
+            customPrompt = instruction.prompt.replace(/\{\{text\}\}/g, transcribedText)
+            logger.info(`Using custom instruction: "${instruction.name}"`)
+          }
+        }
+
+        processedText = await llm.processText(customPrompt, 'custom')
+      } else {
+        logger.info(`Processing with LLM (action: ${action})`)
+        processedText = await llm.processText(transcribedText, action)
+      }
 
       if (this._isInTerminalState()) return
 
diff --git a/src/renderer/pages/CommandsPage.tsx b/src/renderer/pages/CommandsPage.tsx
index 327e58c..ce26b35 100644
--- a/src/renderer/pages/CommandsPage.tsx
+++ b/src/renderer/pages/CommandsPage.tsx
@@ -1,11 +1,12 @@
 // src/renderer/pages/CommandsPage.tsx
-// 커스텀 LLM 명령어 관리: CRUD + 프리셋 5개
+// 커스텀 LLM 명령어 관리: 클릭하면 활성 명령어로 설정 → 다음 녹음 시 적용
 
 import { useState, useEffect, useCallback } from 'react'
-import { Box, Button, IconButton, Dialog, DialogTitle, DialogContent, DialogActions, TextField } from '@mui/material'
+import { Box, Button, IconButton, Dialog, DialogTitle, DialogContent, DialogActions, TextField, Typography } from '@mui/material'
 import AddIcon from '@mui/icons-material/Add'
 import DeleteIcon from '@mui/icons-material/Delete'
 import EditIcon from '@mui/icons-material/Edit'
+import CheckCircleIcon from '@mui/icons-material/CheckCircle'
 import { MetalCard, PhosphorText, Led } from '../components/ds'
 import { d3roPalette, d3roFontMono } from '../theme'
 
@@ -27,18 +28,39 @@ export function CommandsPage(): React.ReactElement {
   const [formName, setFormName] = useState('')
   const [formDesc, setFormDesc] = useState('')
   const [formPrompt, setFormPrompt] = useState('')
+  const [activeId, setActiveId] = useState<string | null>(null)
 
   const loadData = useCallback(async () => {
     setLoading(true)
-    const result = await window.electronAPI.instruction.getAll()
-    if (result.success) {
-      setInstructions(result.data as CustomInstruction[])
+    const [instrResult, configResult] = await Promise.all([
+      window.electronAPI.instruction.getAll(),
+      window.electronAPI.config.getAll(),
+    ])
+    if (instrResult.success) {
+      setInstructions(instrResult.data as CustomInstruction[])
+    }
+    if (configResult.success) {
+      const cfg = configResult.data as Record<string, unknown>
+      setActiveId((cfg['activeInstructionId'] as string) ?? null)
     }
     setLoading(false)
   }, [])
 
   useEffect(() => { loadData() }, [loadData])
 
+  const handleActivate = (id: string) => {
+    const newId = activeId === id ? null : id // 토글: 같은 거 누르면 해제
+    setActiveId(newId)
+    // ConfigService에 저장 + defaultLLMAction을 'custom'으로 변경
+    if (newId) {
+      window.electronAPI.config.set({ key: 'activeInstructionId' as keyof import('@shared/types').AppConfig, value: newId as never })
+      window.electronAPI.config.set({ key: 'defaultLLMAction', value: 'custom' })
+    } else {
+      window.electronAPI.config.set({ key: 'activeInstructionId' as keyof import('@shared/types').AppConfig, value: '' as never })
+      window.electronAPI.config.set({ key: 'defaultLLMAction', value: 'none' })
+    }
+  }
+
   const openAdd = () => {
     setEditId(null)
     setFormName('')
@@ -57,9 +79,7 @@ export function CommandsPage(): React.ReactElement {
 
   const handleSave = async () => {
     if (!formName.trim()) return
-
     if (editId) {
-      // 편집
       await window.electronAPI.instruction.update({
         id: editId,
         name: formName.trim(),
@@ -67,7 +87,6 @@ export function CommandsPage(): React.ReactElement {
         prompt: formPrompt.trim(),
       })
     } else {
-      // 추가
       await window.electronAPI.instruction.create({
         name: formName.trim(),
         description: formDesc.trim(),
@@ -80,12 +99,18 @@ export function CommandsPage(): React.ReactElement {
 
   const handleDelete = async (id: string) => {
     await window.electronAPI.instruction.delete({ id })
+    if (activeId === id) {
+      setActiveId(null)
+      window.electronAPI.config.set({ key: 'defaultLLMAction', value: 'none' })
+    }
     loadData()
   }
 
+  const activeInstruction = instructions.find((i) => i.id === activeId)
+
   return (
     <Box sx={{ maxWidth: 900, mx: 'auto', p: 4 }}>
-      <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 2 }}>
+      <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 1 }}>
         <PhosphorText variant="label" sx={{ color: d3roPalette.text.inactive }}>
           LLM INSTRUCTIONS — {instructions.length} COMMANDS
         </PhosphorText>
@@ -94,6 +119,16 @@ export function CommandsPage(): React.ReactElement {
         </Button>
       </Box>
 
+      {/* 활성 명령어 표시 */}
+      <Box sx={{ mb: 3, p: 1.5, borderRadius: '8px', bgcolor: d3roPalette.bg.inset, boxShadow: 'inset 0 1px 4px rgba(0,0,0,0.3)' }}>
+        <Typography sx={{ fontFamily: d3roFontMono, fontSize: '10px', color: d3roPalette.text.dimLabel, letterSpacing: '1px', mb: 0.5 }}>
+          ACTIVE COMMAND
+        </Typography>
+        <Typography sx={{ fontFamily: d3roFontMono, fontSize: '13px', color: activeInstruction ? d3roPalette.accent.amber : d3roPalette.text.disabled }}>
+          {activeInstruction ? `● ${activeInstruction.name}` : '없음 — 명령어를 클릭하여 활성화'}
+        </Typography>
+      </Box>
+
       {loading ? (
         <PhosphorText variant="dim">LOADING...</PhosphorText>
       ) : instructions.length === 0 ? (
@@ -104,41 +139,59 @@ export function CommandsPage(): React.ReactElement {
         </MetalCard>
       ) : (
         <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1 }}>
-          {instructions.map((inst) => (
-            <MetalCard key={inst.id}>
-              <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
-                <Box sx={{ display: 'flex', alignItems: 'center', gap: 1.5, flex: 1 }}>
-                  <Led color={inst.isBuiltin ? 'amber' : 'green'} size={6} />
-                  <Box>
-                    <Box sx={{ fontSize: '14px', fontWeight: 600, color: d3roPalette.text.primary }}>
-                      {inst.name}
+          {instructions.map((inst) => {
+            const isActive = inst.id === activeId
+            return (
+              <Box
+                key={inst.id}
+                onClick={() => handleActivate(inst.id)}
+                sx={{
+                  cursor: 'pointer',
+                  borderRadius: '22px',
+                  border: isActive ? `2px solid ${d3roPalette.accent.amber}` : '2px solid transparent',
+                  transition: 'border-color 0.15s ease',
+                }}
+              >
+                <MetalCard>
+                  <Box sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
+                    <Box sx={{ display: 'flex', alignItems: 'center', gap: 1.5, flex: 1 }}>
+                      {isActive ? (
+                        <CheckCircleIcon sx={{ fontSize: 16, color: d3roPalette.accent.amber }} />
+                      ) : (
+                        <Led color={inst.isBuiltin ? 'amber' : 'green'} size={6} />
+                      )}
+                      <Box>
+                        <Box sx={{ fontSize: '14px', fontWeight: 600, color: isActive ? d3roPalette.accent.amber : d3roPalette.text.primary }}>
+                          {inst.name}
+                        </Box>
+                        <Box sx={{ fontSize: '11px', color: d3roPalette.text.inactive, mt: 0.25 }}>
+                          {inst.description}
+                        </Box>
+                      </Box>
                     </Box>
-                    <Box sx={{ fontSize: '11px', color: d3roPalette.text.inactive, mt: 0.25 }}>
-                      {inst.description}
+                    <Box sx={{ display: 'flex', gap: 0.5 }} onClick={(e) => e.stopPropagation()}>
+                      <IconButton
+                        size="small"
+                        onClick={() => openEdit(inst)}
+                        sx={{ color: d3roPalette.text.inactive, '&:hover': { color: d3roPalette.accent.amber } }}
+                      >
+                        <EditIcon sx={{ fontSize: 16 }} />
+                      </IconButton>
+                      {!inst.isBuiltin && (
+                        <IconButton
+                          size="small"
+                          onClick={() => handleDelete(inst.id)}
+                          sx={{ color: d3roPalette.text.inactive, '&:hover': { color: d3roPalette.tag.red } }}
+                        >
+                          <DeleteIcon sx={{ fontSize: 16 }} />
+                        </IconButton>
+                      )}
                     </Box>
                   </Box>
-                </Box>
-                <Box sx={{ display: 'flex', gap: 0.5 }}>
-                  <IconButton
-                    size="small"
-                    onClick={() => openEdit(inst)}
-                    sx={{ color: d3roPalette.text.inactive, '&:hover': { color: d3roPalette.accent.amber } }}
-                  >
-                    <EditIcon sx={{ fontSize: 16 }} />
-                  </IconButton>
-                  {!inst.isBuiltin && (
-                    <IconButton
-                      size="small"
-                      onClick={() => handleDelete(inst.id)}
-                      sx={{ color: d3roPalette.text.inactive, '&:hover': { color: d3roPalette.tag.red } }}
-                    >
-                      <DeleteIcon sx={{ fontSize: 16 }} />
-                    </IconButton>
-                  )}
-                </Box>
+                </MetalCard>
               </Box>
-            </MetalCard>
-          ))}
+            )
+          })}
         </Box>
       )}
 
@@ -147,39 +200,13 @@ export function CommandsPage(): React.ReactElement {
           {editId ? '명령어 편집' : '명령어 추가'}
         </DialogTitle>
         <DialogContent>
-          <TextField
-            label="이름"
-            value={formName}
-            onChange={(e) => setFormName(e.target.value)}
-            fullWidth
-            autoFocus
-            sx={{ mt: 1 }}
-          />
-          <TextField
-            label="설명"
-            value={formDesc}
-            onChange={(e) => setFormDesc(e.target.value)}
-            fullWidth
-            sx={{ mt: 2 }}
-          />
-          <TextField
-            label="프롬프트 템플릿"
-            value={formPrompt}
-            onChange={(e) => setFormPrompt(e.target.value)}
-            fullWidth
-            multiline
-            rows={4}
-            sx={{ mt: 2 }}
-            helperText="{{text}}는 전사된 텍스트로 치환됩니다"
-          />
+          <TextField label="이름" value={formName} onChange={(e) => setFormName(e.target.value)} fullWidth autoFocus sx={{ mt: 1 }} />
+          <TextField label="설명" value={formDesc} onChange={(e) => setFormDesc(e.target.value)} fullWidth sx={{ mt: 2 }} />
+          <TextField label="프롬프트 템플릿" value={formPrompt} onChange={(e) => setFormPrompt(e.target.value)} fullWidth multiline rows={4} sx={{ mt: 2 }} helperText="{{text}}는 전사된 텍스트로 치환됩니다" />
         </DialogContent>
         <DialogActions sx={{ px: 3, pb: 2 }}>
-          <Button onClick={() => setDialogOpen(false)} sx={{ color: d3roPalette.text.inactive }}>
-            취소
-          </Button>
-          <Button onClick={handleSave} variant="contained" disabled={!formName.trim()}>
-            저장
-          </Button>
+          <Button onClick={() => setDialogOpen(false)} sx={{ color: d3roPalette.text.inactive }}>취소</Button>
+          <Button onClick={handleSave} variant="contained" disabled={!formName.trim()}>저장</Button>
         </DialogActions>
       </Dialog>
     </Box>