4 files changed, 3 insertions, 7 deletions
diff --git a/packages/core/src/config/config.test.ts b/packages/core/src/config/config.test.ts
index 52b86da8..df3b3de3 100644
--- a/packages/core/src/config/config.test.ts
+++ b/packages/core/src/config/config.test.ts
@@ -46,7 +46,6 @@ describe('Server Config (config.ts)', () => {
   const DEBUG_MODE = false;
   const QUESTION = 'test question';
   const FULL_CONTEXT = false;
-  const USER_AGENT = 'ServerTestAgent/1.0';
   const USER_MEMORY = 'Test User Memory';
   const TELEMETRY = false;
   const EMBEDDING_MODEL = 'gemini-embedding';
@@ -54,7 +53,6 @@ describe('Server Config (config.ts)', () => {
     contentGeneratorConfig: {
       apiKey: API_KEY,
       model: MODEL,
-      userAgent: USER_AGENT,
     },
     embeddingModel: EMBEDDING_MODEL,
     sandbox: SANDBOX,
diff --git a/packages/core/src/core/contentGenerator.ts b/packages/core/src/core/contentGenerator.ts
index f9db121b..736ab7e1 100644
--- a/packages/core/src/core/contentGenerator.ts
+++ b/packages/core/src/core/contentGenerator.ts
@@ -35,18 +35,18 @@ export type ContentGeneratorConfig = {
   model: string;
   apiKey?: string;
   vertexai?: boolean;
-  userAgent: string;
 };
 
 export function createContentGenerator(
   config: ContentGeneratorConfig,
 ): ContentGenerator {
+  const version = process.env.CLI_VERSION || process.version;
   const googleGenAI = new GoogleGenAI({
     apiKey: config.apiKey === '' ? undefined : config.apiKey,
     vertexai: config.vertexai,
     httpOptions: {
       headers: {
-        'User-Agent': config.userAgent,
+        'User-Agent': `GeminiCLI/${version}/(${process.platform}; ${process.arch})`,
       },
     },
   });
diff --git a/packages/core/src/telemetry/sdk.ts b/packages/core/src/telemetry/sdk.ts
index ad5a9c44..65d4ae68 100644
--- a/packages/core/src/telemetry/sdk.ts
+++ b/packages/core/src/telemetry/sdk.ts
@@ -64,10 +64,9 @@ export function initializeTelemetry(config: Config): void {
     return;
   }
 
-  const geminiCliVersion = config.getContentGeneratorConfig().userAgent;
   const resource = new Resource({
     [SemanticResourceAttributes.SERVICE_NAME]: SERVICE_NAME,
-    [SemanticResourceAttributes.SERVICE_VERSION]: geminiCliVersion,
+    [SemanticResourceAttributes.SERVICE_VERSION]: process.version,
     'session.id': sessionId,
   });
 
diff --git a/packages/core/src/tools/tool-registry.test.ts b/packages/core/src/tools/tool-registry.test.ts
index 44e04a9d..4ff8b897 100644
--- a/packages/core/src/tools/tool-registry.test.ts
+++ b/packages/core/src/tools/tool-registry.test.ts
@@ -128,7 +128,6 @@ const baseConfigParams: ConfigParameters = {
     model: 'test-model',
     apiKey: 'test-api-key',
     vertexai: false,
-    userAgent: 'TestAgent/1.0',
   },
   embeddingModel: 'test-embedding-model',
   sandbox: false,