diff --git a/extension/src/shared/form-affordances/__tests__/index.test.ts b/extension/src/shared/form-affordances/__tests__/index.test.ts
new file mode 100644
index 0000000..297e359
--- /dev/null
+++ b/extension/src/shared/form-affordances/__tests__/index.test.ts
@@ -0,0 +1,8 @@
+import { describe, it, expect } from 'vitest';
+import * as affordances from '../index';
+
+describe('form-affordances barrel', () => {
+  it('exports nothing yet but the module loads', () => {
+    expect(typeof affordances).toBe('object');
+  });
+});
diff --git a/extension/src/shared/form-affordances/index.ts b/extension/src/shared/form-affordances/index.ts
new file mode 100644
index 0000000..ab37fc7
--- /dev/null
+++ b/extension/src/shared/form-affordances/index.ts
@@ -0,0 +1,5 @@
+/// Shared form affordance modules. Each named export wires one family of
+/// smart-input behavior (url, group, password, totp, notes) into a mounted
+/// form element. Wired by `popup/components/types/login.ts` after the form
+/// HTML is rendered.
+export {};