feat: add role-specific statistics to telemetry and UI (cont. #15234) (#18824)

Co-authored-by: Yuna Seol <yunaseol@google.com>

packages/core/src/tools/web-fetch.ts

@@ -27,6 +27,7 @@ import {
   logWebFetchFallbackAttempt,
   WebFetchFallbackAttemptEvent,
 } from '../telemetry/index.js';
+import { LlmRole } from '../telemetry/llmRole.js';
 import { WEB_FETCH_TOOL_NAME } from './tool-names.js';
 import { debugLogger } from '../utils/debugLogger.js';
 import { retryWithBackoff } from '../utils/retry.js';
@@ -189,6 +190,7 @@ ${textContent}
         { model: 'web-fetch-fallback' },
         [{ role: 'user', parts: [{ text: fallbackPrompt }] }],
         signal,
+        LlmRole.UTILITY_TOOL,
       );
       const resultText = getResponseText(result) || '';
       return {
@@ -278,6 +280,7 @@ ${textContent}
         { model: 'web-fetch' },
         [{ role: 'user', parts: [{ text: userPrompt }] }],
         signal, // Pass signal
+        LlmRole.UTILITY_TOOL,
       );
 
       debugLogger.debug(

packages/core/src/tools/web-search.ts

@@ -17,6 +17,7 @@ import { getResponseText } from '../utils/partUtils.js';
 import { debugLogger } from '../utils/debugLogger.js';
 import { WEB_SEARCH_DEFINITION } from './definitions/coreTools.js';
 import { resolveToolDeclaration } from './definitions/resolver.js';
+import { LlmRole } from '../telemetry/llmRole.js';
 
 interface GroundingChunkWeb {
   uri?: string;
@@ -86,6 +87,7 @@ class WebSearchToolInvocation extends BaseToolInvocation<
         { model: 'web-search' },
         [{ role: 'user', parts: [{ text: this.params.query }] }],
         signal,
+        LlmRole.UTILITY_TOOL,
       );
 
       const responseText = getResponseText(response);