Changes to add MCP tool count, and MCP tool name as dimension (#6631)

Co-authored-by: Ravikant Agarwal <ravikantag@google.com>
Co-authored-by: Bryan Morgan <bryanmorgan@google.com>

packages/core/src/config/config.test.ts

@@ -488,11 +488,12 @@ describe('Server Config (config.ts)', () => {
       },
     );
 
-    it('logs the session start event', () => {
-      new Config({
+    it('logs the session start event', async () => {
+      const config = new Config({
         ...baseParams,
         usageStatisticsEnabled: true,
       });
+      await config.initialize();
 
       expect(
         ClearcutLogger.prototype.logStartSessionEvent,

packages/core/src/config/config.ts

@@ -346,8 +346,6 @@ export class Config {
     if (this.telemetrySettings.enabled) {
       initializeTelemetry(this);
     }
-
-    logCliConfiguration(this, new StartSessionEvent(this));
   }
 
   /**
@@ -365,6 +363,7 @@ export class Config {
     }
     this.promptRegistry = new PromptRegistry();
     this.toolRegistry = await this.createToolRegistry();
+    logCliConfiguration(this, new StartSessionEvent(this, this.toolRegistry));
   }
 
   async refreshAuth(authMethod: AuthType) {

packages/core/src/telemetry/clearcut-logger/clearcut-logger.ts

@@ -382,6 +382,20 @@ export class ClearcutLogger {
           EventMetadataKey.GEMINI_CLI_START_SESSION_TELEMETRY_LOG_USER_PROMPTS_ENABLED,
         value: event.telemetry_log_user_prompts_enabled.toString(),
       },
+      {
+        gemini_cli_key:
+          EventMetadataKey.GEMINI_CLI_START_SESSION_MCP_SERVERS_COUNT,
+        value: event.mcp_servers_count ? event.mcp_servers_count : '',
+      },
+      {
+        gemini_cli_key:
+          EventMetadataKey.GEMINI_CLI_START_SESSION_MCP_TOOLS_COUNT,
+        value: event.mcp_tools_count ? event.mcp_tools_count : '',
+      },
+      {
+        gemini_cli_key: EventMetadataKey.GEMINI_CLI_START_SESSION_MCP_TOOLS,
+        value: event.mcp_tools ? event.mcp_tools : '',
+      },
     ];
     this.sessionData = data;
 

packages/core/src/telemetry/clearcut-logger/event-metadata-key.ts

@@ -237,4 +237,13 @@ export enum EventMetadataKey {
 
   // Logs tool type whether it is mcp or native.
   GEMINI_CLI_TOOL_TYPE = 62,
+
+  // Logs count of MCP servers in Start Session Event
+  GEMINI_CLI_START_SESSION_MCP_SERVERS_COUNT = 63,
+
+  // Logs count of MCP tools in Start Session Event
+  GEMINI_CLI_START_SESSION_MCP_TOOLS_COUNT = 64,
+
+  // Logs name of MCP tools as comma seperated string
+  GEMINI_CLI_START_SESSION_MCP_TOOLS = 65,
 }

packages/core/src/telemetry/loggers.test.ts

@@ -63,6 +63,7 @@ describe('loggers', () => {
   };
 
   beforeEach(() => {
+    vi.clearAllMocks();
     vi.spyOn(sdk, 'isTelemetrySdkInitialized').mockReturnValue(true);
     vi.spyOn(logs, 'getLogger').mockReturnValue(mockLogger);
     vi.spyOn(uiTelemetry.uiTelemetryService, 'addEvent').mockImplementation(
@@ -161,6 +162,9 @@ describe('loggers', () => {
           file_filtering_respect_git_ignore: true,
           debug_mode: true,
           mcp_servers: 'test-server',
+          mcp_servers_count: '1',
+          mcp_tools: undefined,
+          mcp_tools_count: undefined,
         },
       });
     });

packages/core/src/telemetry/loggers.ts

@@ -79,6 +79,9 @@ export function logCliConfiguration(
     file_filtering_respect_git_ignore: event.file_filtering_respect_git_ignore,
     debug_mode: event.debug_enabled,
     mcp_servers: event.mcp_servers,
+    mcp_servers_count: event.mcp_servers_count,
+    mcp_tools: event.mcp_tools,
+    mcp_tools_count: event.mcp_tools_count,
   };
 
   const logger = logs.getLogger(SERVICE_NAME);

packages/core/src/telemetry/types.ts

@@ -14,6 +14,7 @@ import {
   getDecisionFromOutcome,
   ToolCallDecision,
 } from './tool-call-decision.js';
+import { ToolRegistry } from '../tools/tool-registry.js';
 
 export interface BaseTelemetryEvent {
   'event.name': string;
@@ -38,8 +39,11 @@ export class StartSessionEvent implements BaseTelemetryEvent {
   telemetry_enabled: boolean;
   telemetry_log_user_prompts_enabled: boolean;
   file_filtering_respect_git_ignore: boolean;
+  mcp_servers_count?: string;
+  mcp_tools_count?: string;
+  mcp_tools?: string;
 
-  constructor(config: Config) {
+  constructor(config: Config, toolRegistry?: ToolRegistry) {
     const generatorConfig = config.getContentGeneratorConfig();
     const mcpServers = config.getMcpServers();
 
@@ -66,6 +70,18 @@ export class StartSessionEvent implements BaseTelemetryEvent {
       config.getTelemetryLogPromptsEnabled();
     this.file_filtering_respect_git_ignore =
       config.getFileFilteringRespectGitIgnore();
+    this.mcp_servers_count = mcpServers
+      ? Object.keys(mcpServers).length.toString()
+      : '';
+    if (toolRegistry) {
+      const mcpTools = toolRegistry
+        .getAllTools()
+        .filter((tool) => tool instanceof DiscoveredMCPTool);
+      this.mcp_tools_count = mcpTools.length.toString();
+      this.mcp_tools = mcpTools
+        .map((tool) => (tool as DiscoveredMCPTool).name)
+        .join(',');
+    }
   }
 }