diff --git a/examples/plugins/hello-world/index.js b/examples/plugins/hello-world/index.js
new file mode 100644
index 0000000..927c5db
--- /dev/null
+++ b/examples/plugins/hello-world/index.js
@@ -0,0 +1,133 @@
+/**
+ * Hello World plugin — module entry point.
+ *
+ * The host calls mount(container, api) when the plugin tab is activated and
+ * unmount(container) when it is torn down.
+ *
+ * api shape:
+ *   api.context                          — current PluginContext snapshot
+ *   api.onContextChange(cb) → unsubscribe — called whenever theme/project/session changes
+ *   api.rpc(method, path, body?) → Promise — proxied to this plugin's server subprocess
+ */
+
+export function mount(container, api) {
+  // ── Build DOM ──────────────────────────────────────────────────────────────
+  container.innerHTML = `
+    <div id="hw-root" style="
+      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+      padding: 24px;
+      height: 100%;
+      box-sizing: border-box;
+    ">
+      <h1 style="font-size: 1.4rem; margin: 0 0 8px;">Hello from a plugin!</h1>
+      <p style="font-size: 0.9rem; opacity: 0.7; margin: 0 0 20px;">
+        This tab is rendered by a plain ES module — no iframe.
+      </p>
+
+      <h2 style="font-size: 1rem; margin: 0 0 6px; opacity: 0.8;">Context</h2>
+      <dl style="font-size: 0.85rem; opacity: 0.7; margin: 0 0 24px;">
+        <dt style="font-weight: 600; margin-top: 6px;">Theme</dt>
+        <dd id="hw-theme" style="margin-left: 12px;">—</dd>
+        <dt style="font-weight: 600; margin-top: 6px;">Project</dt>
+        <dd id="hw-project" style="margin-left: 12px;">—</dd>
+        <dt style="font-weight: 600; margin-top: 6px;">Session</dt>
+        <dd id="hw-session" style="margin-left: 12px;">—</dd>
+      </dl>
+
+      <h2 style="font-size: 1rem; margin: 0 0 6px; opacity: 0.8;">Server RPC</h2>
+      <p style="font-size: 0.85rem; opacity: 0.7; margin: 0 0 10px;">
+        Calls this plugin's Node.js server subprocess via the RPC bridge.
+      </p>
+      <div style="display: flex; gap: 8px; flex-wrap: wrap;">
+        <button id="hw-btn-hello">GET /hello</button>
+        <button id="hw-btn-echo">POST /echo</button>
+      </div>
+      <pre id="hw-result" style="
+        margin-top: 12px;
+        padding: 12px;
+        border-radius: 6px;
+        font-size: 0.8rem;
+        overflow-x: auto;
+        white-space: pre-wrap;
+      ">Click a button to make an RPC call…</pre>
+    </div>
+  `;
+
+  // ── Theme helper ──────────────────────────────────────────────────────────
+  function applyTheme(theme) {
+    const root = container.querySelector('#hw-root');
+    if (!root) return;
+    const isDark = theme === 'dark';
+    root.style.background = isDark ? '#1a1a2e' : '#ffffff';
+    root.style.color = isDark ? '#e0e0e0' : '#1a1a2e';
+    const pre = container.querySelector('#hw-result');
+    if (pre) pre.style.background = isDark ? '#2a2a3e' : '#f0f0f4';
+  }
+
+  // ── Render context values ─────────────────────────────────────────────────
+  function renderContext(ctx) {
+    const t = container.querySelector('#hw-theme');
+    const p = container.querySelector('#hw-project');
+    const s = container.querySelector('#hw-session');
+    if (t) t.textContent = ctx.theme || '—';
+    if (p) p.textContent = ctx.project ? ctx.project.name : '(none)';
+    if (s) s.textContent = ctx.session ? (ctx.session.title || ctx.session.id) : '(none)';
+    applyTheme(ctx.theme);
+  }
+
+  // Apply initial context
+  renderContext(api.context);
+
+  // Subscribe to future changes
+  const unsubscribe = api.onContextChange(renderContext);
+
+  // ── Button styles ─────────────────────────────────────────────────────────
+  container.querySelectorAll('button').forEach((btn) => {
+    Object.assign(btn.style, {
+      padding: '8px 16px',
+      border: '1px solid currentColor',
+      borderRadius: '6px',
+      background: 'transparent',
+      color: 'inherit',
+      cursor: 'pointer',
+      fontSize: '0.85rem',
+      opacity: '0.8',
+    });
+    btn.addEventListener('mouseenter', () => { btn.style.opacity = '1'; });
+    btn.addEventListener('mouseleave', () => { btn.style.opacity = '0.8'; });
+  });
+
+  // ── RPC buttons ───────────────────────────────────────────────────────────
+  const resultEl = container.querySelector('#hw-result');
+
+  container.querySelector('#hw-btn-hello').addEventListener('click', async () => {
+    resultEl.textContent = 'Loading…';
+    try {
+      const data = await api.rpc('GET', '/hello');
+      resultEl.textContent = JSON.stringify(data, null, 2);
+    } catch (err) {
+      resultEl.textContent = `Error: ${err.message}`;
+    }
+  });
+
+  container.querySelector('#hw-btn-echo').addEventListener('click', async () => {
+    resultEl.textContent = 'Loading…';
+    try {
+      const data = await api.rpc('POST', '/echo', { greeting: 'Hello from the plugin module!' });
+      resultEl.textContent = JSON.stringify(data, null, 2);
+    } catch (err) {
+      resultEl.textContent = `Error: ${err.message}`;
+    }
+  });
+
+  // Store unsubscribe so unmount can clean up
+  container._hwUnsubscribe = unsubscribe;
+}
+
+export function unmount(container) {
+  if (typeof container._hwUnsubscribe === 'function') {
+    container._hwUnsubscribe();
+    delete container._hwUnsubscribe;
+  }
+  container.innerHTML = '';
+}
diff --git a/examples/plugins/hello-world/manifest.json b/examples/plugins/hello-world/manifest.json
index c2553fc..6438cda 100644
--- a/examples/plugins/hello-world/manifest.json
+++ b/examples/plugins/hello-world/manifest.json
@@ -5,9 +5,9 @@
   "description": "A minimal example plugin that demonstrates the plugin API.",
   "author": "Claude Code UI",
   "icon": "Puzzle",
-  "type": "iframe",
+  "type": "module",
   "slot": "tab",
-  "entry": "index.html",
+  "entry": "index.js",
   "server": "server.js",
   "permissions": []
 }
diff --git a/src/contexts/PluginsContext.tsx b/src/contexts/PluginsContext.tsx
index e433e38..4da04fd 100644
--- a/src/contexts/PluginsContext.tsx
+++ b/src/contexts/PluginsContext.tsx
@@ -9,7 +9,7 @@ export type Plugin = {
   description: string;
   author: string;
   icon: string;
-  type: 'iframe' | 'react';
+  type: 'iframe' | 'react' | 'module';
   slot: 'tab';
   entry: string;
   server: string | null;