diff --git a/ccw/src/templates/dashboard-js/i18n.js b/ccw/src/templates/dashboard-js/i18n.js
index 517532b4..e77ae22c 100644
--- a/ccw/src/templates/dashboard-js/i18n.js
+++ b/ccw/src/templates/dashboard-js/i18n.js
@@ -1734,7 +1734,9 @@ const i18n = {
     'discovery.title': 'Issue Discovery',
     'discovery.description': 'Discover potential issues from multiple perspectives',
     'discovery.noSessions': 'No discovery sessions',
+    'discovery.noDiscoveries': 'No discoveries yet',
     'discovery.runHint': 'Run /issue:discover to start discovering issues',
+    'discovery.runCommand': 'Run /issue:discover to start discovering issues',
     'discovery.sessions': 'Sessions',
     'discovery.findings': 'Findings',
     'discovery.phase': 'Phase',
@@ -1769,10 +1771,18 @@ const i18n = {
     'discovery.confidence': 'Confidence',
     'discovery.suggestedIssue': 'Suggested Issue',
     'discovery.externalRef': 'External Reference',
-    'discovery.noFindings': 'No findings in this session',
+    'discovery.noFindings': 'No findings match your filters',
     'discovery.filterPerspective': 'Filter by Perspective',
     'discovery.filterPriority': 'Filter by Priority',
     'discovery.filterAll': 'All',
+    'discovery.allPerspectives': 'All Perspectives',
+    'discovery.allPriorities': 'All Priorities',
+    'discovery.selectFinding': 'Select a finding to preview',
+    'discovery.location': 'Location',
+    'discovery.code': 'Code',
+    'discovery.impact': 'Impact',
+    'discovery.recommendation': 'Recommendation',
+    'discovery.exportAsIssues': 'Export as Issues',
     'discovery.deleteSession': 'Delete Session',
     'discovery.confirmDelete': 'Are you sure you want to delete this discovery session?',
     'discovery.deleted': 'Discovery session deleted',
@@ -3649,7 +3659,9 @@ const i18n = {
     'discovery.title': '议题发现',
     'discovery.description': '从多个视角发现潜在问题',
     'discovery.noSessions': '暂无发现会话',
+    'discovery.noDiscoveries': '暂无发现',
     'discovery.runHint': '运行 /issue:discover 开始发现问题',
+    'discovery.runCommand': '运行 /issue:discover 开始发现问题',
     'discovery.sessions': '会话',
     'discovery.findings': '发现',
     'discovery.phase': '阶段',
@@ -3684,10 +3696,18 @@ const i18n = {
     'discovery.confidence': '置信度',
     'discovery.suggestedIssue': '建议议题',
     'discovery.externalRef': '外部参考',
-    'discovery.noFindings': '此会话暂无发现',
+    'discovery.noFindings': '没有匹配的发现',
     'discovery.filterPerspective': '按视角筛选',
     'discovery.filterPriority': '按优先级筛选',
     'discovery.filterAll': '全部',
+    'discovery.allPerspectives': '所有视角',
+    'discovery.allPriorities': '所有优先级',
+    'discovery.selectFinding': '选择一个发现以预览',
+    'discovery.location': '位置',
+    'discovery.code': '代码',
+    'discovery.impact': '影响',
+    'discovery.recommendation': '建议',
+    'discovery.exportAsIssues': '导出为议题',
     'discovery.deleteSession': '删除会话',
     'discovery.confirmDelete': '确定要删除此发现会话吗？',
     'discovery.deleted': '发现会话已删除',
diff --git a/ccw/src/templates/dashboard-js/views/codexlens-manager.js b/ccw/src/templates/dashboard-js/views/codexlens-manager.js
index c63c70f1..c62f0198 100644
--- a/ccw/src/templates/dashboard-js/views/codexlens-manager.js
+++ b/ccw/src/templates/dashboard-js/views/codexlens-manager.js
@@ -446,6 +446,12 @@ async function loadSemanticDepsStatus() {
  * Build GPU mode selector HTML
  */
 function buildGpuModeSelector(gpuInfo) {
+  // Check if DirectML is unavailable due to Python environment
+  var directmlUnavailableReason = null;
+  if (!gpuInfo.available.includes('directml') && gpuInfo.pythonEnv && gpuInfo.pythonEnv.error) {
+    directmlUnavailableReason = gpuInfo.pythonEnv.error;
+  }
+
   var modes = [
     {
       id: 'cpu',
@@ -457,10 +463,13 @@ function buildGpuModeSelector(gpuInfo) {
     {
       id: 'directml',
       label: 'DirectML',
-      desc: t('codexlens.directmlModeDesc') || 'Windows GPU (NVIDIA/AMD/Intel)',
+      desc: directmlUnavailableReason
+        ? directmlUnavailableReason
+        : (t('codexlens.directmlModeDesc') || 'Windows GPU (NVIDIA/AMD/Intel)'),
       icon: 'cpu',
       available: gpuInfo.available.includes('directml'),
-      recommended: gpuInfo.mode === 'directml'
+      recommended: gpuInfo.mode === 'directml',
+      warning: directmlUnavailableReason
     },
     {
       id: 'cuda',
@@ -487,6 +496,7 @@ function buildGpuModeSelector(gpuInfo) {
     var isDisabled = !mode.available;
     var isRecommended = mode.recommended;
     var isDefault = mode.id === gpuInfo.mode;
+    var hasWarning = mode.warning;
 
     html +=
       '<label class="flex items-center gap-3 p-2 rounded border cursor-pointer hover:bg-muted/50 transition-colors ' +
@@ -502,7 +512,7 @@ function buildGpuModeSelector(gpuInfo) {
             (isRecommended ? '<span class="text-xs bg-primary/20 text-primary px-1.5 py-0.5 rounded">' + (t('common.recommended') || 'Recommended') + '</span>' : '') +
             (isDisabled ? '<span class="text-xs text-muted-foreground">(' + (t('common.unavailable') || 'Unavailable') + ')</span>' : '') +
           '</div>' +
-          '<div class="text-xs text-muted-foreground">' + mode.desc + '</div>' +
+          '<div class="text-xs ' + (hasWarning ? 'text-warning' : 'text-muted-foreground') + '">' + mode.desc + '</div>' +
         '</div>' +
       '</label>';
   });
diff --git a/ccw/src/tools/codex-lens.ts b/ccw/src/tools/codex-lens.ts
index 50ee6f68..19302542 100644
--- a/ccw/src/tools/codex-lens.ts
+++ b/ccw/src/tools/codex-lens.ts
@@ -379,11 +379,63 @@ async function ensureLiteLLMEmbedderReady(): Promise<BootstrapResult> {
  */
 type GpuMode = 'cpu' | 'cuda' | 'directml';
 
+/**
+ * Python environment info for compatibility checks
+ */
+interface PythonEnvInfo {
+  version: string;        // e.g., "3.11.5"
+  majorMinor: string;     // e.g., "3.11"
+  architecture: number;   // 32 or 64
+  compatible: boolean;    // true if 64-bit and Python 3.8-3.12
+  error?: string;
+}
+
+/**
+ * Check Python environment in venv for DirectML compatibility
+ * DirectML requires: 64-bit Python, version 3.8-3.12
+ */
+async function checkPythonEnvForDirectML(): Promise<PythonEnvInfo> {
+  const pythonPath =
+    process.platform === 'win32'
+      ? join(CODEXLENS_VENV, 'Scripts', 'python.exe')
+      : join(CODEXLENS_VENV, 'bin', 'python');
+
+  if (!existsSync(pythonPath)) {
+    return { version: '', majorMinor: '', architecture: 0, compatible: false, error: 'Python not found in venv' };
+  }
+
+  try {
+    // Get Python version and architecture in one call
+    const checkScript = `import sys, struct; print(f"{sys.version_info.major}.{sys.version_info.minor}.{sys.version_info.micro}|{struct.calcsize('P') * 8}")`;
+    const result = execSync(`"${pythonPath}" -c "${checkScript}"`, { encoding: 'utf-8', timeout: 10000 }).trim();
+    const [version, archStr] = result.split('|');
+    const architecture = parseInt(archStr, 10);
+    const [major, minor] = version.split('.').map(Number);
+    const majorMinor = `${major}.${minor}`;
+
+    // DirectML wheels available for Python 3.8-3.12, 64-bit only
+    const versionCompatible = major === 3 && minor >= 8 && minor <= 12;
+    const archCompatible = architecture === 64;
+    const compatible = versionCompatible && archCompatible;
+
+    let error: string | undefined;
+    if (!archCompatible) {
+      error = `Python is ${architecture}-bit. onnxruntime-directml requires 64-bit Python. Please reinstall Python as 64-bit.`;
+    } else if (!versionCompatible) {
+      error = `Python ${majorMinor} is not supported. onnxruntime-directml requires Python 3.8-3.12.`;
+    }
+
+    return { version, majorMinor, architecture, compatible, error };
+  } catch (e) {
+    return { version: '', majorMinor: '', architecture: 0, compatible: false, error: `Failed to check Python: ${(e as Error).message}` };
+  }
+}
+
 /**
  * Detect available GPU acceleration
  * @returns Detected GPU mode and info
  */
-async function detectGpuSupport(): Promise<{ mode: GpuMode; available: GpuMode[]; info: string }> {
+async function detectGpuSupport(): Promise<{ mode: GpuMode; available: GpuMode[]; info: string; pythonEnv?: PythonEnvInfo }> {
   const available: GpuMode[] = ['cpu'];
   let detectedInfo = 'CPU only';
 
@@ -402,19 +454,20 @@ async function detectGpuSupport(): Promise<{ mode: GpuMode; available: GpuMode[]
     // NVIDIA not available
   }
 
-  // On Windows, DirectML is always available if DirectX 12 is supported
+  // On Windows, DirectML requires 64-bit Python 3.8-3.12
+  let pythonEnv: PythonEnvInfo | undefined;
   if (process.platform === 'win32') {
-    try {
-      // Check for DirectX 12 support via dxdiag or registry
-      // DirectML works on most modern Windows 10/11 systems
+    pythonEnv = await checkPythonEnvForDirectML();
+    if (pythonEnv.compatible) {
       available.push('directml');
       if (available.includes('cuda')) {
         detectedInfo = 'NVIDIA GPU detected (CUDA & DirectML available)';
       } else {
         detectedInfo = 'DirectML available (Windows GPU acceleration)';
       }
-    } catch {
-      // DirectML check failed
+    } else if (pythonEnv.error) {
+      // DirectML not available due to Python environment
+      console.log(`[CodexLens] DirectML unavailable: ${pythonEnv.error}`);
     }
   }
 
@@ -426,7 +479,7 @@ async function detectGpuSupport(): Promise<{ mode: GpuMode; available: GpuMode[]
     recommendedMode = 'cuda';
   }
 
-  return { mode: recommendedMode, available, info: detectedInfo };
+  return { mode: recommendedMode, available, info: detectedInfo, pythonEnv };
 }
 
 /**
@@ -441,6 +494,19 @@ async function installSemantic(gpuMode: GpuMode = 'cpu'): Promise<BootstrapResul
     return { success: false, error: 'CodexLens not installed. Install CodexLens first.' };
   }
 
+  // Check Python environment compatibility for DirectML
+  if (gpuMode === 'directml') {
+    const pythonEnv = await checkPythonEnvForDirectML();
+    if (!pythonEnv.compatible) {
+      const errorDetails = pythonEnv.error || 'Unknown compatibility issue';
+      return {
+        success: false,
+        error: `DirectML installation failed: ${errorDetails}\n\nTo fix this:\n1. Uninstall current Python\n2. Install 64-bit Python 3.10, 3.11, or 3.12 from python.org\n3. Delete ~/.codexlens/venv folder\n4. Reinstall CodexLens`
+      };
+    }
+    console.log(`[CodexLens] Python ${pythonEnv.version} (${pythonEnv.architecture}-bit) - DirectML compatible`);
+  }
+
   const pipPath =
     process.platform === 'win32'
       ? join(CODEXLENS_VENV, 'Scripts', 'pip.exe')
@@ -1411,7 +1477,7 @@ export {
   cancelIndexing,
   isIndexingInProgress,
 };
-export type { GpuMode };
+export type { GpuMode, PythonEnvInfo };
 
 // Backward-compatible export for tests
 export const codexLensTool = {