diff --git a/src/components/wizard/RemoteConfigStep.test.tsx b/src/components/wizard/RemoteConfigStep.test.tsx
index 2677158..5af2e1e 100644
--- a/src/components/wizard/RemoteConfigStep.test.tsx
+++ b/src/components/wizard/RemoteConfigStep.test.tsx
@@ -2,6 +2,8 @@
 // Covers BACK-01: Azure Blob config form — account + SAS/Key toggle, both values preserved
 // Covers BACK-02: Amazon S3 config form — access_key_id, secret_access_key, region
 // Covers BACK-03: S3-Compatible config form — same as S3 plus endpoint field
+// Covers VALID-01: Format validation stubs (RED — validate property not implemented yet)
+// Covers UX-01: Tooltip toggle stubs (RED — tooltipText property not implemented yet)
 import { describe, it, expect } from 'vitest';
 import { render, screen, fireEvent, waitFor } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
@@ -227,4 +229,174 @@ describe('RemoteConfigStep', () => {
       });
     });
   });
+
+  describe('VALID-01 — format validation', () => {
+    // RED stubs — validate property not on FieldDef yet; no regex chaining in buildZodSchema()
+    // These tests will fail until Plan 07-01 implements format validation
+
+    // Azure account name tests
+    it('rejects account name with uppercase letters', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('azureblob');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/storage account name/i)).toBeDefined();
+      });
+      await user.clear(screen.getByLabelText(/storage account name/i));
+      await user.type(screen.getByLabelText(/storage account name/i), 'MyStorage');
+      await user.click(screen.getByRole('button', { name: /next/i }));
+      await waitFor(() => {
+        expect(screen.getByText(/3.{1,5}24 lowercase alphanumeric/i)).toBeDefined();
+      });
+    });
+
+    it('rejects account name shorter than 3 characters', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('azureblob');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/storage account name/i)).toBeDefined();
+      });
+      await user.clear(screen.getByLabelText(/storage account name/i));
+      await user.type(screen.getByLabelText(/storage account name/i), 'ab');
+      await user.click(screen.getByRole('button', { name: /next/i }));
+      await waitFor(() => {
+        expect(screen.getByText(/3.{1,5}24 lowercase alphanumeric/i)).toBeDefined();
+      });
+    });
+
+    it('accepts valid account name (no format error)', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('azureblob');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/storage account name/i)).toBeDefined();
+      });
+      await user.type(screen.getByLabelText(/storage account name/i), 'mystorageaccount');
+      // Fill SAS URL field so form can submit without other required-field errors
+      await user.type(screen.getByLabelText(/sas url/i), 'https://mystorage.blob.core.windows.net/?sv=test');
+      await user.click(screen.getByRole('button', { name: /next/i }));
+      await waitFor(() => {
+        expect(screen.queryByText(/3.{1,5}24 lowercase alphanumeric/i)).toBeNull();
+      });
+    });
+
+    // S3 region tests
+    it('rejects S3 region with invalid format (spaces)', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('s3');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/region/i)).toBeDefined();
+      });
+      await user.type(screen.getByLabelText(/region/i), 'us east 1');
+      await user.click(screen.getByRole('button', { name: /next/i }));
+      await waitFor(() => {
+        expect(screen.getByText(/valid aws region format/i)).toBeDefined();
+      });
+    });
+
+    it('accepts valid S3 region (no format error)', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('s3');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/region/i)).toBeDefined();
+      });
+      // Fill all required S3 fields so form can submit
+      await user.type(screen.getByLabelText(/access key id/i), 'AKIAIOSFODNN7EXAMPLE');
+      await user.type(screen.getByLabelText(/secret access key/i), 'wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY');
+      await user.type(screen.getByLabelText(/region/i), 'us-east-1');
+      await user.click(screen.getByRole('button', { name: /next/i }));
+      await waitFor(() => {
+        expect(screen.queryByText(/valid aws region format/i)).toBeNull();
+      });
+    });
+
+    // GCS project_number tests
+    it('rejects GCS project_number with non-digits', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('gcs' as BackendType);
+      await waitFor(() => {
+        expect(screen.getByLabelText(/project number/i)).toBeDefined();
+      });
+      await user.type(screen.getByLabelText(/project number/i), 'abc');
+      await user.click(screen.getByRole('button', { name: /next/i }));
+      await waitFor(() => {
+        expect(screen.getByText(/digits only/i)).toBeDefined();
+      });
+    });
+
+    it('accepts valid GCS project_number (no format error)', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('gcs' as BackendType);
+      await waitFor(() => {
+        expect(screen.getByLabelText(/project number/i)).toBeDefined();
+      });
+      await user.type(screen.getByLabelText(/project number/i), '123456789');
+      await user.click(screen.getByRole('button', { name: /next/i }));
+      await waitFor(() => {
+        expect(screen.queryByText(/digits only/i)).toBeNull();
+      });
+    });
+  });
+
+  describe('UX-01 — contextual tooltips', () => {
+    // RED stubs — tooltipText not on FieldDef yet; no ⓘ buttons rendered
+    // These tests will fail until Plan 07-02 implements tooltip toggle
+
+    it('renders ⓘ button on azureblob sas_url field', async () => {
+      renderWithBackend('azureblob');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/sas url/i)).toBeDefined();
+      });
+      // ⓘ button does not exist yet — will throw "Unable to find role 'button'"
+      expect(screen.getByRole('button', { name: /more info about sas url/i })).toBeDefined();
+    });
+
+    it('shows tooltip panel when ⓘ is clicked on sas_url', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('azureblob');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/sas url/i)).toBeDefined();
+      });
+      // ⓘ button does not exist yet — getByRole will throw
+      await user.click(screen.getByRole('button', { name: /more info about sas url/i }));
+      await waitFor(() => {
+        // Tooltip text should be visible after clicking ⓘ
+        expect(screen.getByText(/shared access signature/i)).toBeDefined();
+      });
+    });
+
+    it('hides tooltip panel when ⓘ is clicked again', async () => {
+      const user = userEvent.setup();
+      renderWithBackend('azureblob');
+      await waitFor(() => {
+        expect(screen.getByLabelText(/sas url/i)).toBeDefined();
+      });
+      // ⓘ button does not exist yet — getByRole will throw
+      await user.click(screen.getByRole('button', { name: /more info about sas url/i }));
+      await waitFor(() => {
+        expect(screen.getByText(/shared access signature/i)).toBeDefined();
+      });
+      await user.click(screen.getByRole('button', { name: /more info about sas url/i }));
+      await waitFor(() => {
+        expect(screen.queryByText(/shared access signature/i)).toBeNull();
+      });
+    });
+
+    it('renders ⓘ button on SFTP auth method section', async () => {
+      renderWithBackend('sftp' as BackendType);
+      await waitFor(() => {
+        expect(screen.getByLabelText(/host/i)).toBeDefined();
+      });
+      // ⓘ button does not exist yet — will throw "Unable to find role 'button'"
+      expect(screen.getByRole('button', { name: /more info about authentication/i })).toBeDefined();
+    });
+
+    it('renders ⓘ button on OneDrive token field', async () => {
+      renderWithBackend('onedrive' as BackendType);
+      await waitFor(() => {
+        expect(screen.getByLabelText(/oauth token/i)).toBeDefined();
+      });
+      // ⓘ button does not exist yet — will throw "Unable to find role 'button'"
+      // Note: this matches any "more info about X" button on the OneDrive form
+      expect(screen.getByRole('button', { name: /more info about oauth token/i })).toBeDefined();
+    });
+  });
 });