3 files changed, 53 insertions, 2 deletions
diff --git a/packages/cli/src/ui/commands/authCommand.test.ts b/packages/cli/src/ui/commands/authCommand.test.ts
new file mode 100644
index 00000000..d6d925db
--- /dev/null
+++ b/packages/cli/src/ui/commands/authCommand.test.ts
@@ -0,0 +1,36 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, beforeEach } from 'vitest';
+import { authCommand } from './authCommand.js';
+import { type CommandContext } from './types.js';
+import { createMockCommandContext } from '../../test-utils/mockCommandContext.js';
+
+describe('authCommand', () => {
+  let mockContext: CommandContext;
+
+  beforeEach(() => {
+    mockContext = createMockCommandContext();
+  });
+
+  it('should return a dialog action to open the auth dialog', () => {
+    if (!authCommand.action) {
+      throw new Error('The auth command must have an action.');
+    }
+
+    const result = authCommand.action(mockContext, '');
+
+    expect(result).toEqual({
+      type: 'dialog',
+      dialog: 'auth',
+    });
+  });
+
+  it('should have the correct name and description', () => {
+    expect(authCommand.name).toBe('auth');
+    expect(authCommand.description).toBe('change the auth method');
+  });
+});
diff --git a/packages/cli/src/ui/commands/authCommand.ts b/packages/cli/src/ui/commands/authCommand.ts
new file mode 100644
index 00000000..29bd2c9d
--- /dev/null
+++ b/packages/cli/src/ui/commands/authCommand.ts
@@ -0,0 +1,16 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { OpenDialogActionReturn, SlashCommand } from './types.js';
+
+export const authCommand: SlashCommand = {
+  name: 'auth',
+  description: 'change the auth method',
+  action: (_context, _args): OpenDialogActionReturn => ({
+    type: 'dialog',
+    dialog: 'auth',
+  }),
+};
diff --git a/packages/cli/src/ui/commands/types.ts b/packages/cli/src/ui/commands/types.ts
index 9aad3399..b35374a8 100644
--- a/packages/cli/src/ui/commands/types.ts
+++ b/packages/cli/src/ui/commands/types.ts
@@ -66,14 +66,13 @@ export interface MessageActionReturn {
 export interface OpenDialogActionReturn {
   type: 'dialog';
   // TODO: Add 'theme' | 'auth' | 'editor' | 'privacy' as migration happens.
-  dialog: 'help' | 'theme';
+  dialog: 'help' | 'auth' | 'theme';
 }
 
 export type SlashCommandActionReturn =
   | ToolActionReturn
   | MessageActionReturn
   | OpenDialogActionReturn;
-
 // The standardized contract for any command in the system.
 export interface SlashCommand {
   name: string;