diff --git a/packages/client-android/android/app/src/main/assets/index.html b/packages/client-android/android/app/src/main/assets/index.html
new file mode 100644
index 0000000..6f41757
--- /dev/null
+++ b/packages/client-android/android/app/src/main/assets/index.html
@@ -0,0 +1,91 @@
+<!DOCTYPE html>
+<html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,user-scalable=no">
+<title>Yuzu GCA</title>
+<style>
+*{margin:0;padding:0;box-sizing:border-box}
+body{font-family:system-ui;background:#0f172a;color:#e2e8f0;padding:16px}
+h1{font-size:20px;color:#38bdf8;margin-bottom:4px}
+.info{color:#94a3b8;font-size:12px;margin-bottom:16px}
+.card{background:#1e293b;border-radius:8px;padding:16px;margin:12px 0}
+.card-title{font-size:13px;color:#94a3b8;margin-bottom:8px}
+.btn{display:block;width:100%;padding:14px;margin:8px 0;border:none;border-radius:8px;font-size:15px;cursor:pointer;color:#fff}
+.btn-blue{background:#1e40af}
+.btn-green{background:#15803d}
+.btn-red{background:#991b1b}
+.input{display:block;width:100%;padding:12px;margin:8px 0;border:none;border-radius:8px;font-size:14px;background:#0f172a;color:#e2e8f0}
+.log{background:#0a0f1a;padding:12px;border-radius:8px;margin-top:8px;max-height:200px;overflow-y:auto;font-size:11px;white-space:pre-wrap;color:#22c55e;font-family:monospace}
+.tab{display:inline-block;padding:8px 16px;margin-right:4px;border-radius:6px 6px 0 0;background:#1e293b;color:#64748b;font-size:13px;cursor:pointer}
+.tab-on{background:#1e40af;color:#fff}
+</style></head><body>
+<h1>Yuzu GCA</h1>
+<div class="info">Self-contained MCP Client</div>
+
+<div>
+ <span class="tab tab-on" onclick="switchTab('exec')">Exec</span>
+ <span class="tab" onclick="switchTab('files')">Files</span>
+ <span class="tab" onclick="switchTab('sysinfo')">SysInfo</span>
+</div>
+
+<div class="card" id="tab-exec">
+ <div class="card-title">Execute Command (Gateway)</div>
+ <input class="input" id="gwUrl" placeholder="Gateway URL (http://x.x.x.x:3000)" value="http://10.1.0.17:3000">
+ <input class="input" id="cmd" placeholder="Command (e.g. ls, whoami, dir)">
+ <button class="btn btn-blue" onclick="execCmd()">Execute</button>
+ <div class="log" id="log-exec"></div>
+</div>
+
+<div class="card" id="tab-files" style="display:none">
+ <div class="card-title">List Files (Gateway)</div>
+ <input class="input" id="path" placeholder="Path (e.g. /sdcard, .)" value=".">
+ <button class="btn btn-blue" onclick="listFiles()">List</button>
+ <div class="log" id="log-files"></div>
+</div>
+
+<div class="card" id="tab-sysinfo" style="display:none">
+ <div class="card-title">System Info (Local)</div>
+ <button class="btn btn-blue" onclick="showSysInfo()">Refresh</button>
+ <div class="log" id="log-sysinfo"></div>
+</div>
+
+<script>
+function switchTab(t){
+ document.querySelectorAll('.tab').forEach(e=>e.classList.toggle('tab-on',false));
+ document.querySelectorAll('.card').forEach(e=>e.style.display='none');
+ document.getElementById('tab-'+t).style.display='block';
+ event.target.classList.toggle('tab-on',true);
+}
+
+function log(id,msg){
+ var l=document.getElementById(id);
+ l.innerText+=msg+'\n';l.scrollTop=l.scrollHeight;
+}
+
+function execCmd(){
+ var gw=document.getElementById('gwUrl').value,c=document.getElementById('cmd').value;
+ var id='log-exec';document.getElementById(id).innerText='';
+ log(id,'$ '+c);
+ fetch(gw+'/tools/exec',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({command:c})})
+ .then(r=>r.json()).then(d=>log(id,d.stdout||d.stderr||JSON.stringify(d)))
+ .catch(e=>log(id,'ERR: '+e.message));
+}
+
+function listFiles(){
+ var gw=document.getElementById('gwUrl').value,p=document.getElementById('path').value;
+ var id='log-files';document.getElementById(id).innerText='';
+ log(id,'ls '+p);
+ fetch(gw+'/tools/file_list',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({path:p})})
+ .then(r=>r.json()).then(d=>{
+  if(d.entries){d.entries.forEach(e=>log(id,(e.type==='dir'?'[DIR]':'')+' '+e.name+(e.size?' ('+e.size+'B)':'')))}
+  else log(id,JSON.stringify(d));
+ }).catch(e=>log(id,'ERR: '+e.message));
+}
+
+function showSysInfo(){
+ var id='log-sysinfo';document.getElementById(id).innerText='';
+ log(id,'Platform: '+navigator.platform);
+ log(id,'UserAgent: '+navigator.userAgent);
+ log(id,'Online: '+navigator.onLine);
+ if(typeof Android!=='undefined'){log(id,'Bridge: YES');log(id,'Files: '+Android.fetchText('version.txt'))}
+ else log(id,'Bridge: NO');
+}
+</script></body></html>
diff --git a/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainActivity.kt b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainActivity.kt
index efbddfd..06a3b6c 100644
--- a/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainActivity.kt
+++ b/packages/client-android/android/app/src/main/java/dev/yuzu/gca/MainActivity.kt
@@ -1,12 +1,17 @@
 package dev.yuzu.gca
 
-import com.facebook.react.ReactActivity
-import com.facebook.react.ReactActivityDelegate
-import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
-import com.facebook.react.defaults.DefaultReactActivityDelegate
+import android.os.Bundle
+import android.webkit.WebView
+import androidx.appcompat.app.AppCompatActivity
 
-class MainActivity : ReactActivity() {
-    override fun getMainComponentName(): String = "main"
-    override fun createReactActivityDelegate(): ReactActivityDelegate =
-        DefaultReactActivityDelegate(this, mainComponentName, fabricEnabled)
+class MainActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        WebView(this).apply {
+            settings.javaScriptEnabled = true
+            settings.domStorageEnabled = true
+            settings.allowUniversalAccessFromFileURLs = true
+            loadUrl("file:///android_asset/index.html")
+        }.also { setContentView(it) }
+    }
 }
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