diff --git a/src/shared/usage-tracker.test.ts b/src/shared/usage-tracker.test.ts
index f73fa59..f58b389 100644
--- a/src/shared/usage-tracker.test.ts
+++ b/src/shared/usage-tracker.test.ts
@@ -83,6 +83,7 @@ describe('UsageTracker', () => {
       const body = JSON.parse(agentCall![1].body);
       expect(body.app_key).toBe('uhzx8md3');
       expect(body.project_id).toBeUndefined();
+      expect(body.client).toBe('mcp');
 
       // No Authorization header in local mode
       expect(agentCall![1].headers['Authorization']).toBeUndefined();
diff --git a/src/shared/usage-tracker.ts b/src/shared/usage-tracker.ts
index b15f945..fd83451 100644
--- a/src/shared/usage-tracker.ts
+++ b/src/shared/usage-tracker.ts
@@ -73,7 +73,7 @@ export class UsageTracker {
 
   private async reportAgentConnected(): Promise<void> {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const body: Record<string, any> = {};
+    const body: Record<string, any> = { client: 'mcp' };
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const headers: Record<string, any> = { 'Content-Type': 'application/json' };