feat: show cache-creation (write) token total in session usage summary

src/app/components/event-tab/event-tab.component.html

@@ -229,6 +229,16 @@
             </td>
           </tr>
           }
+          @if (selectedEvent()?.cacheCreationTokenCount) {
+          <tr>
+            <td>cacheCreationTokenCount</td>
+            <td>
+              <span class="value-cell numeric-cell">
+                <span [matTooltip]="(selectedEvent()!.cacheCreationTokenCount | number) || ''">{{ selectedEvent()!.cacheCreationTokenCount | number }}</span>
+              </span>
+            </td>
+          </tr>
+          }
         </table>
         } @else {
         <table app-info-table title="Usage Summary for Event">
@@ -245,10 +255,28 @@
             <td>Total Prompt Tokens</td>
             <td class="numeric-cell">{{ sessionUsageMetadata()['Prompt Tokens'] | number }}</td>
           </tr>
+          @if (sessionUsageMetadata()['Cached Content Tokens'] > 0) {
+          <tr>
+            <td>Total Cached Content Tokens</td>
+            <td class="numeric-cell">{{ sessionUsageMetadata()['Cached Content Tokens'] | number }}</td>
+          </tr>
+          }
+          @if (sessionUsageMetadata()['Cache Creation Tokens'] > 0) {
+          <tr>
+            <td>Total Cache Creation Tokens</td>
+            <td class="numeric-cell">{{ sessionUsageMetadata()['Cache Creation Tokens'] | number }}</td>
+          </tr>
+          }
           <tr>
             <td>Total Candidates Tokens</td>
             <td class="numeric-cell">{{ sessionUsageMetadata()['Candidates Tokens'] | number }}</td>
           </tr>
+          @if (sessionUsageMetadata()['Thoughts Tokens'] > 0) {
+          <tr>
+            <td>Total Thoughts Tokens</td>
+            <td class="numeric-cell">{{ sessionUsageMetadata()['Thoughts Tokens'] | number }}</td>
+          </tr>
+          }
           <tr>
             <td>Total Tokens</td>
             <td class="numeric-cell">{{ sessionUsageMetadata()['Total Tokens'] | number }}</td>

src/app/components/event-tab/event-tab.component.ts

@@ -190,24 +190,40 @@ export class EventTabComponent {
     const allEvents = Array.from(this.eventDataMap().values());
     let totalPromptTokens = 0;
     let totalCandidatesTokens = 0;
+    let totalCachedContentTokens = 0;
+    let totalThoughtsTokens = 0;
+    let totalCacheCreationTokens = 0;
     let totalTokens = 0;
 
     allEvents.forEach(ev => {
       const metadata = ev.usageMetadata;
       if (metadata) {
         const prompt = metadata.promptTokenCount ?? metadata.promptTokens ?? 0;
         const candidates = metadata.candidatesTokenCount ?? metadata.candidatesTokens ?? 0;
+        const cachedContent = metadata.cachedContentTokenCount ?? metadata.cachedContentTokens ?? 0;
+        const thoughts = metadata.thoughtsTokenCount ?? metadata.thoughtsTokens ?? 0;
         const total = metadata.totalTokenCount ?? metadata.totalTokens ?? 0;
 
         totalPromptTokens += Number(prompt);
         totalCandidatesTokens += Number(candidates);
+        totalCachedContentTokens += Number(cachedContent);
+        totalThoughtsTokens += Number(thoughts);
         totalTokens += Number(total);
       }
+      // Cache-write (creation) tokens live on the event itself, not in
+      // usageMetadata: google.genai's usage type forbids extra fields, so ADK
+      // surfaces them on the serializable event (alongside cacheMetadata)
+      // instead. Read/reasoning above are genuine usageMetadata fields.
+      const cacheCreation = ev.cacheCreationTokenCount ?? ev.cacheCreationTokens ?? 0;
+      totalCacheCreationTokens += Number(cacheCreation);
     });
 
     return {
       'Prompt Tokens': totalPromptTokens,
       'Candidates Tokens': totalCandidatesTokens,
+      'Cached Content Tokens': totalCachedContentTokens,
+      'Cache Creation Tokens': totalCacheCreationTokens,
+      'Thoughts Tokens': totalThoughtsTokens,
       'Total Tokens': totalTokens
     };
   });

src/app/core/models/types.ts

@@ -131,6 +131,10 @@ export declare interface Event extends LlmResponse {
   inputTranscription?: { text: string; };
   outputTranscription?: { text: string; };
   usageMetadata?: any;
+  // Prompt-cache write (creation) tokens. Serialized on the event itself
+  // rather than inside usageMetadata because google.genai's usage type
+  // forbids extra fields.
+  cacheCreationTokenCount?: number;
   interrupted?: boolean;
   turnComplete?: boolean;
   systemInstructionChanged?: boolean;