fix(patch): cherry-pick f08b4af to release/v0.45.2-pr-27749 to patch version v0.45.2 and create version 0.45.3 (#27769)

Co-authored-by: David Pierce <davidapierce@google.com>
Co-authored-by: Gal Zahavi <38544478+galz10@users.noreply.github.com>

packages/cli/src/ui/commands/helpCommand.ts

@@ -6,13 +6,36 @@
 
 import { CommandKind, type SlashCommand } from './types.js';
 import { MessageType, type HistoryItemHelp } from '../types.js';
+import { getAntigravityInstallInfo } from '../utils/antigravityUtils.js';
 
 export const helpCommand: SlashCommand = {
   name: 'help',
   kind: CommandKind.BUILT_IN,
   description: 'For help on gemini-cli',
   autoExecute: true,
-  action: async (context) => {
+  action: async (context, args) => {
+    const lowerArgs = args?.toLowerCase() || '';
+    const hasAntigravity = lowerArgs.includes('antigravity');
+    const hasInstallOrMigrate =
+      lowerArgs.includes('install') || lowerArgs.includes('migrate');
+
+    if (hasAntigravity && hasInstallOrMigrate) {
+      const info = getAntigravityInstallInfo();
+
+      if (info) {
+        context.ui.addItem({
+          type: MessageType.INFO,
+          text: `To install the Antigravity CLI on ${info.platformName}, run the following command:\n\n'${info.installCmd}'`,
+        });
+      } else {
+        context.ui.addItem({
+          type: MessageType.INFO,
+          text: `Learn more about Antigravity CLI at https://antigravity.google/docs/cli-getting-started`,
+        });
+      }
+      return;
+    }
+
     const helpItem: Omit<HistoryItemHelp, 'id'> = {
       type: MessageType.HELP,
       timestamp: new Date(),