2 files changed, 160 insertions, 0 deletions
diff --git a/packages/cli/src/ui/commands/aboutCommand.test.ts b/packages/cli/src/ui/commands/aboutCommand.test.ts
new file mode 100644
index 00000000..48dd6db3
--- /dev/null
+++ b/packages/cli/src/ui/commands/aboutCommand.test.ts
@@ -0,0 +1,117 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
+import { aboutCommand } from './aboutCommand.js';
+import { type CommandContext } from './types.js';
+import { createMockCommandContext } from '../../test-utils/mockCommandContext.js';
+import * as versionUtils from '../../utils/version.js';
+import { MessageType } from '../types.js';
+
+vi.mock('../../utils/version.js', () => ({
+  getCliVersion: vi.fn(),
+}));
+
+describe('aboutCommand', () => {
+  let mockContext: CommandContext;
+  const originalPlatform = process.platform;
+  const originalEnv = { ...process.env };
+
+  beforeEach(() => {
+    mockContext = createMockCommandContext({
+      services: {
+        config: {
+          getModel: vi.fn(),
+        },
+        settings: {
+          merged: {
+            selectedAuthType: 'test-auth',
+          },
+        },
+      },
+      ui: {
+        addItem: vi.fn(),
+      },
+    } as unknown as CommandContext);
+
+    vi.mocked(versionUtils.getCliVersion).mockResolvedValue('test-version');
+    vi.spyOn(mockContext.services.config!, 'getModel').mockReturnValue(
+      'test-model',
+    );
+    process.env.GOOGLE_CLOUD_PROJECT = 'test-gcp-project';
+    Object.defineProperty(process, 'platform', {
+      value: 'test-os',
+    });
+  });
+
+  afterEach(() => {
+    vi.unstubAllEnvs();
+    Object.defineProperty(process, 'platform', {
+      value: originalPlatform,
+    });
+    process.env = originalEnv;
+    vi.clearAllMocks();
+  });
+
+  it('should have the correct name and description', () => {
+    expect(aboutCommand.name).toBe('about');
+    expect(aboutCommand.description).toBe('show version info');
+  });
+
+  it('should call addItem with all version info', async () => {
+    if (!aboutCommand.action) {
+      throw new Error('The about command must have an action.');
+    }
+
+    await aboutCommand.action(mockContext, '');
+
+    expect(mockContext.ui.addItem).toHaveBeenCalledWith(
+      {
+        type: MessageType.ABOUT,
+        cliVersion: 'test-version',
+        osVersion: 'test-os',
+        sandboxEnv: 'no sandbox',
+        modelVersion: 'test-model',
+        selectedAuthType: 'test-auth',
+        gcpProject: 'test-gcp-project',
+      },
+      expect.any(Number),
+    );
+  });
+
+  it('should show the correct sandbox environment variable', async () => {
+    process.env.SANDBOX = 'gemini-sandbox';
+    if (!aboutCommand.action) {
+      throw new Error('The about command must have an action.');
+    }
+
+    await aboutCommand.action(mockContext, '');
+
+    expect(mockContext.ui.addItem).toHaveBeenCalledWith(
+      expect.objectContaining({
+        sandboxEnv: 'gemini-sandbox',
+      }),
+      expect.any(Number),
+    );
+  });
+
+  it('should show sandbox-exec profile when applicable', async () => {
+    process.env.SANDBOX = 'sandbox-exec';
+    process.env.SEATBELT_PROFILE = 'test-profile';
+    if (!aboutCommand.action) {
+      throw new Error('The about command must have an action.');
+    }
+
+    await aboutCommand.action(mockContext, '');
+
+    expect(mockContext.ui.addItem).toHaveBeenCalledWith(
+      expect.objectContaining({
+        sandboxEnv: 'sandbox-exec (test-profile)',
+      }),
+      expect.any(Number),
+    );
+  });
+});
diff --git a/packages/cli/src/ui/commands/aboutCommand.ts b/packages/cli/src/ui/commands/aboutCommand.ts
new file mode 100644
index 00000000..3cb8c2f6
--- /dev/null
+++ b/packages/cli/src/ui/commands/aboutCommand.ts
@@ -0,0 +1,43 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { getCliVersion } from '../../utils/version.js';
+import { SlashCommand } from './types.js';
+import process from 'node:process';
+import { MessageType, type HistoryItemAbout } from '../types.js';
+
+export const aboutCommand: SlashCommand = {
+  name: 'about',
+  description: 'show version info',
+  action: async (context) => {
+    const osVersion = process.platform;
+    let sandboxEnv = 'no sandbox';
+    if (process.env.SANDBOX && process.env.SANDBOX !== 'sandbox-exec') {
+      sandboxEnv = process.env.SANDBOX;
+    } else if (process.env.SANDBOX === 'sandbox-exec') {
+      sandboxEnv = `sandbox-exec (${
+        process.env.SEATBELT_PROFILE || 'unknown'
+      })`;
+    }
+    const modelVersion = context.services.config?.getModel() || 'Unknown';
+    const cliVersion = await getCliVersion();
+    const selectedAuthType =
+      context.services.settings.merged.selectedAuthType || '';
+    const gcpProject = process.env.GOOGLE_CLOUD_PROJECT || '';
+
+    const aboutItem: Omit<HistoryItemAbout, 'id'> = {
+      type: MessageType.ABOUT,
+      cliVersion,
+      osVersion,
+      sandboxEnv,
+      modelVersion,
+      selectedAuthType,
+      gcpProject,
+    };
+
+    context.ui.addItem(aboutItem, Date.now());
+  },
+};