diff --git a/packages/client/ui-directory-picker-native/tests/client-flow.spec.tsx b/packages/client/ui-directory-picker-native/tests/client-flow.spec.tsx
index d501fdfce2..98d2611e01 100644
--- a/packages/client/ui-directory-picker-native/tests/client-flow.spec.tsx
+++ b/packages/client/ui-directory-picker-native/tests/client-flow.spec.tsx
@@ -7,6 +7,7 @@ import { SlotsService } from '@deepseek-ai/dsh-client-runtime/client'
 import type { DirectoryFlowOwnerProps } from '@deepseek-ai/dsh-client-ui-workspace/client'
 import { apply, inject } from '../src/client/index.ts'
 import { NativeDirectoryFlow } from '../src/client/flow.ts'
+import { apply as nodeApply } from '../src/index.ts'
 
 afterEach(cleanup)
 
@@ -225,3 +226,11 @@ describe('directory-picker-native client half', () => {
     expect(opened.container.innerHTML).toBe('')
   })
 })
+
+describe('directory-picker-native node half', () => {
+  // The invariant companion is mounted by the vitest-wide invariant host on
+  // every Context this suite creates; its registration is covered there.
+  it('the node apply is an inert loader seat', () => {
+    expect(() => { nodeApply() }).not.toThrow()
+  })
+})
diff --git a/packages/client/ui-directory-picker/tests/client-flow.spec.tsx b/packages/client/ui-directory-picker/tests/client-flow.spec.tsx
index 69ea819564..4bc86bf5eb 100644
--- a/packages/client/ui-directory-picker/tests/client-flow.spec.tsx
+++ b/packages/client/ui-directory-picker/tests/client-flow.spec.tsx
@@ -9,6 +9,7 @@ import { usePinnedBrowserLanguages } from '@deepseek-ai/dsh-client-test-runtime'
 import type { DirectoryFlowOwnerProps } from '@deepseek-ai/dsh-client-ui-workspace/client'
 import { apply, inject } from '../src/client/index.ts'
 import { BrowseDirectoryFlow } from '../src/client/flow.ts'
+import { apply as nodeApply } from '../src/index.ts'
 
 // The service reads its initial locale from the browser; these specs assert
 // the shipped Chinese copy, so they state the browser they assume.
@@ -221,3 +222,11 @@ describe('directory-picker-browse client half', () => {
     expect(view.container.innerHTML).toBe('')
   })
 })
+
+describe('directory-picker-browse node half', () => {
+  // The invariant companion is mounted by the vitest-wide invariant host on
+  // every Context this suite creates; its registration is covered there.
+  it('the node apply is an inert loader seat', () => {
+    expect(() => { nodeApply() }).not.toThrow()
+  })
+})