diff --git a/scripts/test-server-ws.mjs b/scripts/test-server-ws.mjs
new file mode 100644
index 0000000..0da31c9
--- /dev/null
+++ b/scripts/test-server-ws.mjs
@@ -0,0 +1,103 @@
+import assert from 'node:assert/strict';
+import http from 'node:http';
+import { createRequire } from 'node:module';
+import { fileURLToPath } from 'node:url';
+import path from 'node:path';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const require = createRequire(path.join(__dirname, '..', 'server', 'package.json'));
+const WebSocket = require('ws');
+
+let port, mod, clients = [];
+
+function wsu() { return `ws://127.0.0.1:${port}/socket.io/?EIO=4&transport=websocket&version=2.4.0&token=62170b705234c4f4807a9b22420bb93cf1a2aacfa4c5d3b47804482babb8eb50`; }
+async function c() {
+    const ws = new WebSocket(wsu()); clients.push(ws); ws._m = []; ws.on('message', d => ws._m.push(d.toString()));
+    await new Promise((r, j) => { const t = setTimeout(() => j(Error('connect')), 5e3); ws.on('open', () => { clearTimeout(t); r(); }); });
+    ws.send('40'); const s = Date.now(); while (ws._m.length < 2 && Date.now()-s < 5e3) await new Promise(r => setTimeout(r, 50));
+    if (ws._m.length < 2) throw Error('handshake');
+    ws._m.length = 0; return ws;
+}
+function s(ws, evt, d={}) { ws.send(`42${JSON.stringify([evt,d])}`); }
+function a(ws) { if (ws._m.length) { const r=ws._m.shift(); return r.startsWith('42') ? JSON.parse(r.substring(2)) : r; } return new Promise((resolve, reject) => { const t=setTimeout(()=>reject(Error('timeout')),3e3); const h=(d)=>{clearTimeout(t);ws.removeListener('message',h);const r=d.toString();resolve(r.startsWith('42')?JSON.parse(r.substring(2)):r);};ws.on('message',h);}); }
+async function w(ws, evt, ms=3000) { const st=Date.now(); while(Date.now()-st<ms) { for(let i=0;i<ws._m.length;i++){const r=ws._m[i];ws._m.splice(i,1);if(r.startsWith('42')){try{const[e]=JSON.parse(r.substring(2));if(e===evt)return e}catch{/* skip */}}} await new Promise(r=>setTimeout(r,50));} throw Error(`wait:${evt}`); }
+async function j(ws, rid, pid, pw=null) { s(ws,'join_room',{roomId:rid,peerId:pid,password:pw,protocolVersion:'1.0.0'}); assert.equal((await a(ws))[0],'room_data'); }
+function close() { clients.forEach(w=>{try{w.close()}catch{/* ignore */}}); clients.length=0; }
+
+try {
+    process.env.ADMIN_METRICS_TOKEN = 'ws-integration-test-32chars-minimum!';
+    mod = await import('../server/index.js');
+    await mod.startServer(0,'127.0.0.1');
+    port = mod.httpServer.address().port;
+
+    // --- Pool: 2 peers in 1 room, test everything ---
+    const rid = 't-'+Date.now();
+    const p1 = await c(), p2 = await c();
+
+    // Room + join
+    await j(p1, rid, 'a'); await j(p2, rid, 'b'); p1._m.length = p2._m.length = 0;
+
+    // Relay
+    s(p1,'play',{currentTime:10}); await w(p2,'play');
+    s(p1,'pause',{currentTime:20}); await w(p2,'pause');
+    s(p1,'seek',{currentTime:30}); await w(p2,'seek');
+
+    // Force Sync
+    s(p1,'force_sync_prepare',{targetTime:0}); await w(p2,'force_sync_prepare');
+    s(p1,'force_sync_ack',{}); await w(p2,'force_sync_ack');
+    s(p1,'force_sync_execute',{}); await w(p2,'force_sync_execute');
+
+    // EVENT_ACK
+    s(p2,'event_ack',{targetId:'a',actionTimestamp:Date.now()}); await w(p1,'event_ack');
+
+    // Lobby
+    s(p1,'episode_lobby',{expectedTitle:'S01E01'}); await w(p2,'episode_lobby');
+
+    // Leave
+    s(p1,'leave_room',{}); const [ev,d]=await a(p2); assert.equal(ev,'peer_status');assert.equal(d.status,'left');
+
+    close();
+
+    // --- Password room ---
+    const prid = 'pw-'+Date.now();
+    const pw1 = await c(); await j(pw1, prid, 'admin', 's3cret');
+    const pw2 = await c();
+    s(pw2,'join_room',{roomId:prid,password:'BAD',peerId:'bad',protocolVersion:'1.0.0'});
+    assert.equal((await a(pw2))[0],'error','wrong pw');
+    const pw3 = await c();
+    s(pw3,'join_room',{roomId:prid,password:'s3cret',peerId:'good',protocolVersion:'1.0.0'});
+    assert.equal((await a(pw3))[0],'room_data','correct pw');
+    close();
+
+    // --- Protocol check + Ping + GET_ROOMS + Health ---
+    const x = await c();
+    s(x,'join_room',{roomId:'v-'+Date.now(),peerId:'old',protocolVersion:'0.0.1'});
+    await w(x,'error'); // version mismatch
+    x._m.length = 0;
+    s(x,'ping',{t:Date.now()}); await w(x,'pong');
+    await j(x,'lst-'+Date.now(),'l1');
+    x._m.length = 0;
+    s(x,'get_rooms',{}); await w(x,'room_list');
+    close();
+
+    // Dedup
+    const did = 'dup-'+Date.now();
+    const d1 = await c(), d2 = await c();
+    await j(d1, did, 'dup'); d1._m.length = 0;
+    s(d2,'join_room',{roomId:did,peerId:'dup',protocolVersion:'1.0.0'});
+    assert.equal((await a(d2))[0],'room_data','dedup');
+    close();
+
+    // Health HTTP (no conn needed)
+    const [st,body] = await new Promise(r => http.get(`http://127.0.0.1:${port}/`, res => {
+        let d=''; res.on('data',c=>d+=c); res.on('end',()=>r([res.statusCode,JSON.parse(d)])); }));
+    assert.equal(st,200); assert.equal(body.status,'online');
+
+    console.log('All 13 WebSocket integration tests passed');
+} catch(e) {
+    console.error('FAILED:', e.message);
+    process.exitCode=1;
+} finally {
+    close();
+    if (mod?.stopServerForTests) await mod.stopServerForTests();
+}
diff --git a/scripts/verify-release.mjs b/scripts/verify-release.mjs
index 40fd975..0ed31be 100644
--- a/scripts/verify-release.mjs
+++ b/scripts/verify-release.mjs
@@ -13,6 +13,7 @@ const checks = [
   }],
   ['rate-limiter unit tests', 'node', ['scripts/test-rate-limiter.mjs']],
   ['episode-utils unit tests', 'node', ['scripts/test-episode-utils.mjs']],
+  ['server WebSocket integration', 'node', ['scripts/test-server-ws.mjs']],
   ['content video finder', 'node', ['scripts/test-content-video-finder.cjs']],
   ['audio settings', 'node', ['scripts/test-audio-settings.mjs']],
   ['popup refresh cooldown', 'node', ['scripts/test-popup-refresh-cooldown.mjs']],