feat(interaction-api): Add grounding tool usage breakdown to Interaction Usage.

PiperOrigin-RevId: 907241831

Author: google-genai-bot

src/interactions/resources/interactions.ts

@@ -1998,6 +1998,11 @@ export interface Usage {
    */
   cached_tokens_by_modality?: Array<Usage.CachedTokensByModality>;
 
+  /**
+   * Grounding tool count.
+   */
+  grounding_tool_count?: Array<Usage.GroundingToolCount>;
+
   /**
    * A breakdown of input token usage by modality.
    */
@@ -2061,6 +2066,21 @@ export namespace Usage {
     tokens?: number;
   }
 
+  /**
+   * The number of grounding tool counts.
+   */
+  export interface GroundingToolCount {
+    /**
+     * The number of grounding tool counts.
+     */
+    count?: number;
+
+    /**
+     * The grounding tool type associated with the count.
+     */
+    type?: 'google_search' | 'google_maps' | 'retrieval';
+  }
+
   /**
    * The token count for a single response modality.
    */