diff --git a/packages/core/src/code_assist/telemetry.test.ts b/packages/core/src/code_assist/telemetry.test.ts
index c838aeb943..c90040f22e 100644
--- a/packages/core/src/code_assist/telemetry.test.ts
+++ b/packages/core/src/code_assist/telemetry.test.ts
@@ -316,6 +316,14 @@ describe('telemetry', () => {
             prompt_id: 'p1',
             traceId: 'trace-1',
           },
+          response: {
+            resultDisplay: {
+              diffStat: {
+                model_added_lines: 5,
+                model_removed_lines: 3,
+              },
+            },
+          },
           outcome: ToolConfirmationOutcome.ProceedOnce,
           status: 'success',
         } as unknown as CompletedToolCall,
@@ -327,6 +335,8 @@ describe('telemetry', () => {
         traceId: 'trace-1',
         status: ActionStatus.ACTION_STATUS_NO_ERROR,
         interaction: ConversationInteractionInteraction.ACCEPT_FILE,
+        acceptedLines: '5',
+        removedLines: '3',
         isAgentic: true,
       });
     });
diff --git a/packages/core/src/code_assist/telemetry.ts b/packages/core/src/code_assist/telemetry.ts
index ad02691d53..59ff179c50 100644
--- a/packages/core/src/code_assist/telemetry.ts
+++ b/packages/core/src/code_assist/telemetry.ts
@@ -22,6 +22,10 @@ import { EDIT_TOOL_NAMES } from '../tools/tool-names.js';
 import { getErrorMessage } from '../utils/errors.js';
 import type { CodeAssistServer } from './server.js';
 import { ToolConfirmationOutcome } from '../tools/tools.js';
+import {
+  computeModelAddedAndRemovedLines,
+  getFileDiffFromResultDisplay,
+} from '../utils/fileDiffUtils.js';
 
 export async function recordConversationOffered(
   server: CodeAssistServer,
@@ -110,6 +114,8 @@ function summarizeToolCalls(
 
   // Treat file edits as ACCEPT_FILE and everything else as unknown.
   let isEdit = false;
+  let acceptedLines = 0;
+  let removedLines = 0;
 
   // Iterate the tool calls and summarize them into a single conversation
   // interaction so that the ConversationOffered and ConversationInteraction
@@ -136,7 +142,18 @@ function summarizeToolCalls(
 
       // Edits are ACCEPT_FILE, everything else is UNKNOWN.
       if (EDIT_TOOL_NAMES.has(toolCall.request.name)) {
-        isEdit ||= true;
+        isEdit = true;
+
+        if (toolCall.status === 'success') {
+          const fileDiff = getFileDiffFromResultDisplay(
+            toolCall.response.resultDisplay,
+          );
+          if (fileDiff?.diffStat) {
+            const lines = computeModelAddedAndRemovedLines(fileDiff.diffStat);
+            acceptedLines += lines.addedLines;
+            removedLines += lines.removedLines;
+          }
+        }
       }
     }
   }
@@ -149,6 +166,8 @@ function summarizeToolCalls(
         isEdit
           ? ConversationInteractionInteraction.ACCEPT_FILE
           : ConversationInteractionInteraction.UNKNOWN,
+        isEdit ? String(acceptedLines) : undefined,
+        isEdit ? String(removedLines) : undefined,
       )
     : undefined;
 }
@@ -157,15 +176,18 @@ function createConversationInteraction(
   traceId: string,
   status: ActionStatus,
   interaction: ConversationInteractionInteraction,
+  acceptedLines?: string,
+  removedLines?: string,
 ): ConversationInteraction {
   return {
     traceId,
     status,
     interaction,
+    acceptedLines,
+    removedLines,
     isAgentic: true,
   };
 }
-
 function includesCode(resp: GenerateContentResponse): boolean {
   if (!resp.candidates) {
     return false;
diff --git a/packages/core/src/code_assist/types.ts b/packages/core/src/code_assist/types.ts
index 7845ceee89..0e2f353aa3 100644
--- a/packages/core/src/code_assist/types.ts
+++ b/packages/core/src/code_assist/types.ts
@@ -295,6 +295,7 @@ export interface ConversationInteraction {
   status?: ActionStatus;
   interaction?: ConversationInteractionInteraction;
   acceptedLines?: string;
+  removedLines?: string;
   language?: string;
   isAgentic?: boolean;
 }
diff --git a/packages/core/src/utils/fileDiffUtils.ts b/packages/core/src/utils/fileDiffUtils.ts
index bf9478627c..c0d3f64f37 100644
--- a/packages/core/src/utils/fileDiffUtils.ts
+++ b/packages/core/src/utils/fileDiffUtils.ts
@@ -4,7 +4,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import type { FileDiff } from '../tools/tools.js';
+import type { DiffStat, FileDiff } from '../tools/tools.js';
 import type { ToolCallRecord } from '../services/chatRecordingService.js';
 
 /**
@@ -23,17 +23,14 @@ export function getFileDiffFromResultDisplay(
     typeof resultDisplay.diffStat === 'object' &&
     resultDisplay.diffStat !== null
   ) {
-    const diffStat = resultDisplay.diffStat as FileDiff['diffStat'];
-    if (diffStat) {
+    if (resultDisplay.diffStat) {
       return resultDisplay;
     }
   }
   return undefined;
 }
 
-export function computeModelAddedAndRemovedLines(
-  stats: FileDiff['diffStat'] | undefined,
-): {
+export function computeModelAddedAndRemovedLines(stats: DiffStat | undefined): {
   addedLines: number;
   removedLines: number;
 } {