2 files changed, 54 insertions, 4 deletions

diff --git a/packages/core/src/core/contentGenerator.test.ts b/packages/core/src/core/contentGenerator.test.ts
index b92e8046..5a857121 100644
--- a/packages/core/src/core/contentGenerator.test.ts
+++ b/packages/core/src/core/contentGenerator.test.ts
@@ -41,6 +41,44 @@ describe('createContentGenerator', () => {
   });
 
   it('should create a GoogleGenAI content generator', async () => {
+    const mockConfig = {
+      getUsageStatisticsEnabled: () => true,
+    } as unknown as Config;
+
+    const mockGenerator = {
+      models: {},
+    } as unknown as GoogleGenAI;
+    vi.mocked(GoogleGenAI).mockImplementation(() => mockGenerator as never);
+    const generator = await createContentGenerator(
+      {
+        model: 'test-model',
+        apiKey: 'test-api-key',
+        authType: AuthType.USE_GEMINI,
+      },
+      mockConfig,
+    );
+    expect(GoogleGenAI).toHaveBeenCalledWith({
+      apiKey: 'test-api-key',
+      vertexai: undefined,
+      httpOptions: {
+        headers: {
+          'User-Agent': expect.any(String),
+          'x-gemini-api-privileged-user-id': expect.any(String),
+        },
+      },
+    });
+    expect(generator).toEqual(
+      new LoggingContentGenerator(
+        (mockGenerator as GoogleGenAI).models,
+        mockConfig,
+      ),
+    );
+  });
+
+  it('should create a GoogleGenAI content generator with client install id logging disabled', async () => {
+    const mockConfig = {
+      getUsageStatisticsEnabled: () => false,
+    } as unknown as Config;
     const mockGenerator = {
       models: {},
     } as unknown as GoogleGenAI;
diff --git a/packages/core/src/core/contentGenerator.ts b/packages/core/src/core/contentGenerator.ts
index 19b285c7..0556805e 100644
--- a/packages/core/src/core/contentGenerator.ts
+++ b/packages/core/src/core/contentGenerator.ts
@@ -19,6 +19,7 @@ import { Config } from '../config/config.js';
 
 import { UserTierId } from '../code_assist/types.js';
 import { LoggingContentGenerator } from './loggingContentGenerator.js';
+import { getInstallationId } from '../utils/user_id.js';
 
 /**
  * Interface abstracting the core functionalities for generating content and counting tokens.
@@ -108,15 +109,16 @@ export async function createContentGenerator(
   sessionId?: string,
 ): Promise<ContentGenerator> {
   const version = process.env['CLI_VERSION'] || process.version;
-  const httpOptions = {
-    headers: {
-      'User-Agent': `GeminiCLI/${version} (${process.platform}; ${process.arch})`,
-    },
+  const userAgent = `GeminiCLI/${version} (${process.platform}; ${process.arch})`;
+  const baseHeaders: Record<string, string> = {
+    'User-Agent': userAgent,
   };
+
   if (
     config.authType === AuthType.LOGIN_WITH_GOOGLE ||
     config.authType === AuthType.CLOUD_SHELL
   ) {
+    const httpOptions = { headers: baseHeaders };
     return new LoggingContentGenerator(
       await createCodeAssistContentGenerator(
         httpOptions,
@@ -132,6 +134,16 @@ export async function createContentGenerator(
     config.authType === AuthType.USE_GEMINI ||
     config.authType === AuthType.USE_VERTEX_AI
   ) {
+    let headers: Record<string, string> = { ...baseHeaders };
+    if (gcConfig?.getUsageStatisticsEnabled()) {
+      const installationId = getInstallationId();
+      headers = {
+        ...headers,
+        'x-gemini-api-privileged-user-id': `${installationId}`,
+      };
+    }
+    const httpOptions = { headers };
+
     const googleGenAI = new GoogleGenAI({
       apiKey: config.apiKey === '' ? undefined : config.apiKey,
       vertexai: config.vertexai,