feat(cli): add hideBanner setting to disable startup banner (#2803)

Co-authored-by: Pascal Birchler <pascalb@google.com>

docs/cli/configuration.md

@@ -189,6 +189,15 @@ In addition to a project settings file, a project's `.gemini` directory can cont
     "hideTips": true
     ```
 
+- **`hideBanner`** (boolean):
+  - **Description:** Enables or disables the startup banner (ASCII art logo) in the CLI interface.
+  - **Default:** `false`
+  - **Example:**
+
+    ```json
+    "hideBanner": true
+    ```
+
 - **`maxSessionTurns`** (number):
   - **Description:** Sets the maximum number of turns for a session. If the session exceeds this limit, the CLI will stop processing and start a new chat.
   - **Default:** `-1` (unlimited)
@@ -222,6 +231,7 @@ In addition to a project settings file, a project's `.gemini` directory can cont
   },
   "usageStatisticsEnabled": true,
   "hideTips": false,
+  "hideBanner": false,
   "maxSessionTurns": 10
 }
 ```

packages/cli/src/config/settings.ts

@@ -79,6 +79,7 @@ export interface Settings {
   // UI setting. Does not display the ANSI-controlled terminal title.
   hideWindowTitle?: boolean;
   hideTips?: boolean;
+  hideBanner?: boolean;
 
   // Setting for setting maximum number of user/model/tool turns in a session.
   maxSessionTurns?: number;

packages/cli/src/ui/App.test.tsx

@@ -187,6 +187,10 @@ vi.mock('./components/Tips.js', () => ({
   Tips: vi.fn(() => null),
 }));
 
+vi.mock('./components/Header.js', () => ({
+  Header: vi.fn(() => null),
+}));
+
 describe('App UI', () => {
   let mockConfig: MockServerConfig;
   let mockSettings: LoadedSettings;
@@ -445,6 +449,38 @@ describe('App UI', () => {
     expect(vi.mocked(Tips)).not.toHaveBeenCalled();
   });
 
+  it('should display Header component by default', async () => {
+    const { Header } = await import('./components/Header.js');
+    const { unmount } = render(
+      <App
+        config={mockConfig as unknown as ServerConfig}
+        settings={mockSettings}
+        version={mockVersion}
+      />,
+    );
+    currentUnmount = unmount;
+    await Promise.resolve();
+    expect(vi.mocked(Header)).toHaveBeenCalled();
+  });
+
+  it('should not display Header component when hideBanner is true', async () => {
+    const { Header } = await import('./components/Header.js');
+    mockSettings = createMockSettings({
+      user: { hideBanner: true },
+    });
+
+    const { unmount } = render(
+      <App
+        config={mockConfig as unknown as ServerConfig}
+        settings={mockSettings}
+        version={mockVersion}
+      />,
+    );
+    currentUnmount = unmount;
+    await Promise.resolve();
+    expect(vi.mocked(Header)).not.toHaveBeenCalled();
+  });
+
   it('should show tips if system says show, but workspace and user settings say hide', async () => {
     mockSettings = createMockSettings({
       system: { hideTips: false },

packages/cli/src/ui/App.tsx

@@ -716,11 +716,13 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
           key={staticKey}
           items={[
             <Box flexDirection="column" key="header">
-              <Header
-                terminalWidth={terminalWidth}
-                version={version}
-                nightly={nightly}
-              />
+              {!settings.merged.hideBanner && (
+                <Header
+                  terminalWidth={terminalWidth}
+                  version={version}
+                  nightly={nightly}
+                />
+              )}
               {!settings.merged.hideTips && <Tips config={config} />}
             </Box>,
             ...history.map((h) => (