feat: Add GA4 tracking for Gemini CLI extension (#9124)

* feat: Add GA4 tracking for Gemini CLI extension

This change adds a new parameter `gemini_cli_extension` to the MCP GA4 tracking when the `experimental:mcp` command is run. This parameter is set to "true" when the `IS_GEMINI_CLI_EXTENSION` environment variable is set, and "false" otherwise.

This will allow us to track the usage of the Gemini CLI extension.

* feat: Add GA4 tracking for Gemini CLI extension

This change adds a new parameter `gemini_cli_extension` to the MCP GA4 tracking when the `experimental:mcp` command is run. This parameter is set to "true" when the `IS_GEMINI_CLI_EXTENSION` environment variable is set, and "false" otherwise.

This will allow us to track the usage of the Gemini CLI extension.

(tests for private method removed per PR feedback)

---------

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: Joe Hanley <[email protected]>

Author: google-labs-jules[bot]

src/mcp/index.ts

@@ -88,9 +88,14 @@ export class FirebaseMcpServer {
   ): Promise<void> {
     // wait until ready or until 2s has elapsed
     if (!this.clientInfo) await timeoutFallback(this.ready(), null, 2000);
-    const clientInfoParams = {
+    const clientInfoParams: {
+      mcp_client_name: string;
+      mcp_client_version: string;
+      gemini_cli_extension: string;
+    } = {
       mcp_client_name: this.clientInfo?.name || "<unknown-client>",
       mcp_client_version: this.clientInfo?.version || "<unknown-version>",
+      gemini_cli_extension: process.env.IS_GEMINI_CLI_EXTENSION ? "true" : "false",
     };
     return trackGA4(event, { ...params, ...clientInfoParams });
   }