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diff --git a/packages/meshbay-hub/src/meshbay_hub/static/helloworld-app-settings.js b/packages/meshbay-hub/src/meshbay_hub/static/helloworld-app-settings.js
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+import { html, useState, useEffect } from './vendor/htm-preact.js';
+import { t } from './i18n.js';
+import { useSaver } from './settings-ui.js';
+import { FolderPickerField } from './folder-tree.js';
+
+/**
+ * HelloWorld's settings: one folder, and nothing else.
+ *
+ * This is the whole server-side surface an application needs — no op, no MNP
+ * message, no route, no roster accessor. `saveDirectories` is bound to this
+ * app's registry key by the page, and `ops.set_app_directories` stores the row
+ * under that name without knowing what it is.
+ *
+ * It takes the shared props and no others (`docs/apps.md` §3b), which is what
+ * `test_app_settings_plugin.py` checks of every pane — including this one, so
+ * the reference implementation is held to the contract it demonstrates.
+ */
+function HelloWorldSettings({ roots, dirs, settings, saveDirectories }) {
+  const { busy, msg, run } = useSaver();
+  const [directories, setDirectories] = useState(
+    settings.helloworldDirectories || []);
+
+  useEffect(() => {
+    setDirectories(settings.helloworldDirectories || []);
+  }, [settings.helloworldDirectories]);
+
+  const current = settings.helloworldDirectories || [];
+  const dirty = directories.length !== current.length
+    || directories.some((d, i) => d !== current[i]);
+
+  return html`
+    <div class="app-settings">
+      <${FolderPickerField}
+        label=${t('settings_app.helloworld_directory_label')}
+        hint=${t('settings_app.helloworld_directory_hint')}
+        roots=${roots} dirs=${dirs} mode="single"
+        value=${directories[0] || ''} disabled=${busy}
+        onChange=${(path) => setDirectories(path ? [path] : [])} />
+
+      <button class="btn btn-small btn-secondary" style="margin-top:4px"
+        disabled=${busy || !dirty}
+        onClick=${() => run(() => saveDirectories(directories))}>
+        ${busy ? t('settings_app.saving') : t('settings_app.save')}
+      </button>
+      ${msg && html`<p class="settings-hint">${msg}</p>`}
+    </div>
+  `;
+}
+
+export { HelloWorldSettings };