3 files changed, 52 insertions, 0 deletions
diff --git a/packages/cli/src/ui/commands/corgiCommand.test.ts b/packages/cli/src/ui/commands/corgiCommand.test.ts
new file mode 100644
index 00000000..3c25e8cd
--- /dev/null
+++ b/packages/cli/src/ui/commands/corgiCommand.test.ts
@@ -0,0 +1,34 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { corgiCommand } from './corgiCommand.js';
+import { type CommandContext } from './types.js';
+import { createMockCommandContext } from '../../test-utils/mockCommandContext.js';
+
+describe('corgiCommand', () => {
+  let mockContext: CommandContext;
+
+  beforeEach(() => {
+    mockContext = createMockCommandContext();
+    vi.spyOn(mockContext.ui, 'toggleCorgiMode');
+  });
+
+  it('should call the toggleCorgiMode function on the UI context', async () => {
+    if (!corgiCommand.action) {
+      throw new Error('The corgi command must have an action.');
+    }
+
+    await corgiCommand.action(mockContext, '');
+
+    expect(mockContext.ui.toggleCorgiMode).toHaveBeenCalledTimes(1);
+  });
+
+  it('should have the correct name and description', () => {
+    expect(corgiCommand.name).toBe('corgi');
+    expect(corgiCommand.description).toBe('Toggles corgi mode.');
+  });
+});
diff --git a/packages/cli/src/ui/commands/corgiCommand.ts b/packages/cli/src/ui/commands/corgiCommand.ts
new file mode 100644
index 00000000..290c071e
--- /dev/null
+++ b/packages/cli/src/ui/commands/corgiCommand.ts
@@ -0,0 +1,15 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { type SlashCommand } from './types.js';
+
+export const corgiCommand: SlashCommand = {
+  name: 'corgi',
+  description: 'Toggles corgi mode.',
+  action: (context, _args) => {
+    context.ui.toggleCorgiMode();
+  },
+};
diff --git a/packages/cli/src/ui/commands/types.ts b/packages/cli/src/ui/commands/types.ts
index 51b66fb4..3e269cbf 100644
--- a/packages/cli/src/ui/commands/types.ts
+++ b/packages/cli/src/ui/commands/types.ts
@@ -47,6 +47,8 @@ export interface CommandContext {
      * @param history The array of history items to load.
      */
     loadHistory: UseHistoryManagerReturn['loadHistory'];
+    /** Toggles a special display mode. */
+    toggleCorgiMode: () => void;
   };
   // Session-specific data
   session: {
@@ -103,6 +105,7 @@ export type SlashCommandActionReturn =
   | QuitActionReturn
   | OpenDialogActionReturn
   | LoadHistoryActionReturn;
+
 // The standardized contract for any command in the system.
 export interface SlashCommand {
   name: string;