1 files changed, 19 insertions, 1 deletions
diff --git a/packages/core/src/telemetry/uiTelemetry.ts b/packages/core/src/telemetry/uiTelemetry.ts
index 8d1b044f..318478aa 100644
--- a/packages/core/src/telemetry/uiTelemetry.ts
+++ b/packages/core/src/telemetry/uiTelemetry.ts
@@ -63,6 +63,10 @@ export interface SessionMetrics {
     };
     byName: Record<string, ToolCallStats>;
   };
+  files: {
+    totalLinesAdded: number;
+    totalLinesRemoved: number;
+  };
 }
 
 const createInitialModelMetrics = (): ModelMetrics => ({
@@ -96,6 +100,10 @@ const createInitialMetrics = (): SessionMetrics => ({
     },
     byName: {},
   },
+  files: {
+    totalLinesAdded: 0,
+    totalLinesRemoved: 0,
+  },
 });
 
 export class UiTelemetryService extends EventEmitter {
@@ -171,7 +179,7 @@ export class UiTelemetryService extends EventEmitter {
   }
 
   private processToolCall(event: ToolCallEvent) {
-    const { tools } = this.#metrics;
+    const { tools, files } = this.#metrics;
     tools.totalCalls++;
     tools.totalDurationMs += event.duration_ms;
 
@@ -209,6 +217,16 @@ export class UiTelemetryService extends EventEmitter {
       tools.totalDecisions[event.decision]++;
       toolStats.decisions[event.decision]++;
     }
+
+    // Aggregate line count data from metadata
+    if (event.metadata) {
+      if (event.metadata['ai_added_lines'] !== undefined) {
+        files.totalLinesAdded += event.metadata['ai_added_lines'];
+      }
+      if (event.metadata['ai_removed_lines'] !== undefined) {
+        files.totalLinesRemoved += event.metadata['ai_removed_lines'];
+      }
+    }
   }
 }