feat(mcp): add gemini mcp commands for add, remove and list (#5481)

packages/cli/src/commands/mcp.ts

@@ -0,0 +1,27 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// File for 'gemini mcp' command
+import type { CommandModule, Argv } from 'yargs';
+import { addCommand } from './mcp/add.js';
+import { removeCommand } from './mcp/remove.js';
+import { listCommand } from './mcp/list.js';
+
+export const mcpCommand: CommandModule = {
+  command: 'mcp',
+  describe: 'Manage MCP servers',
+  builder: (yargs: Argv) =>
+    yargs
+      .command(addCommand)
+      .command(removeCommand)
+      .command(listCommand)
+      .demandCommand(1, 'You need at least one command before continuing.')
+      .version(false),
+  handler: () => {
+    // yargs will automatically show help if no subcommand is provided
+    // thanks to demandCommand(1) in the builder.
+  },
+};