diff --git a/src/cli.js b/src/cli.js
index cb793a7d..d8c8c7ba 100644
--- a/src/cli.js
+++ b/src/cli.js
@@ -36,7 +36,8 @@ const sdkCommands = {
 	build:   'builds a project',
 	clean:   'removes previous build directories',
 	create:  'creates a new project',
-	project: 'get and set tiapp.xml settings'
+	project: 'get and set tiapp.xml settings',
+	serve:   'serves a project through the Titanium Vite runtime',
 };
 
 /**
@@ -416,7 +417,13 @@ export class CLI {
 		const cmd = args.pop();
 		args.pop(); // discard argv
 
-		// remove any trailing undefined args
+		// `args` are Commander's action-handler arguments, one entry per declared
+		// positional in order. Variadic positionals (e.g. `sdk uninstall
+		// [versions...]`) arrive as a nested array, which consumers like
+		// `sdk.js` rely on (`cli.argv._[0]` is the versions array). Flattening to
+		// `cmd.args` here would collapse that array into a string and break them.
+		// The `serve`/`build` positional platform is handled separately in
+		// `initBuildPlatform()` via `command.processedArgs`, not `argv._`.
 		while (args.length && args[args.length - 1] === undefined) {
 			args.pop();
 		}
@@ -621,20 +628,19 @@ export class CLI {
 	}
 
 	/**
-	 * If the current command is the "build" command, this function will check
-	 * if the "build" command has a `--platform` option (which is should), then
-	 * prompt for the platform is not explicitly passed in.
+	 * If the current command supports platform-specific config, this function
+	 * checks for the `--platform` option and prompts when missing.
 	 *
-	 * Finally, the platform specific options and flags are added to the
-	 * Commander.js "build" command context so that the second parse will
-	 * pick up the newly defined options/flags.
+	 * Finally, the platform specific options and flags are added to the command
+	 * context so that the second parse picks up the newly defined options/flags.
 	 *
 	 * @returns {Promise}
 	 * @access private
 	 */
 	async initBuildPlatform() {
 		const cmdName = this.command.name();
-		if (cmdName !== 'build') {
+		// Commands with build-style platform branches.
+		if (cmdName !== 'build' && cmdName !== 'serve') {
 			return;
 		}
 
@@ -643,6 +649,15 @@ export class CLI {
 			return;
 		}
 
+		// Support shorthand positional platform syntax, e.g. `ti serve ios`.
+		// Commander parses this into processedArgs via the [platform] argument
+		// declared in loadCommand().
+		const positionalPlatform = this.command.processedArgs?.[0];
+		if (!this.argv.platform && positionalPlatform && platformOption.values.includes(positionalPlatform)) {
+			this.debugLogger.trace(`Converting positional platform argument "${positionalPlatform}" to --platform`);
+			this.argv.platform = positionalPlatform;
+		}
+
 		// when specifying `--platform ios`, the SDK's option callback converts
 		// it to `iphone`, however the platform config uses `ios` and we must
 		// convert it back
@@ -983,6 +998,9 @@ export class CLI {
 				this.command.createHelp = () => {
 					return Object.assign(new TiHelp(this, conf.platforms), this.command.configureHelp());
 				};
+
+				cmd.argument('[platform]', 'target platform');
+				cmd.usage('[platform] [options]');
 			}
 
 			applyCommandConfig(this, cmdName, cmd, conf);
diff --git a/test/commands/ti-build.test.js b/test/commands/ti-build.test.js
index 7fd9fbf6..5952be60 100644
--- a/test/commands/ti-build.test.js
+++ b/test/commands/ti-build.test.js
@@ -8,7 +8,7 @@ describe('ti build', () => {
 
 		const output = stripColor(stdout);
 		expect(output).toMatch(/Titanium Command-Line Interface/);
-		expect(output).toMatch(/Usage: titanium build \[options\]/);
+		expect(output).toMatch(/Usage: titanium build \[platform\] \[options\]/);
 		expect(output).toMatch(/Builds an existing app or module project./);
 		expect(output).toMatch(/Build Options:/);
 		expect(output).toMatch(/Global Options:/);
diff --git a/test/commands/ti-sdk.test.js b/test/commands/ti-sdk.test.js
index 068da898..347feacd 100644
--- a/test/commands/ti-sdk.test.js
+++ b/test/commands/ti-sdk.test.js
@@ -334,4 +334,29 @@ describe('ti sdk', () => {
 			expect(exitCode).toBe(0);
 		}));
 	});
+
+	// Regression guard: `sdk uninstall` takes a variadic `[versions...]`
+	// positional, which `sdk.js` reads as the array `cli.argv._[0]`. A parsing
+	// change once flattened variadic positionals into individual strings, so
+	// `versions.filter()` threw and the command printed usage instead of running.
+	// These cases reproduce that without network by uninstalling versions that
+	// are not installed, exercising single and multi-version parsing.
+	describe('uninstall', () => {
+		it('should parse a single version positional and report not found', initSDKHome(async ({ run }) => {
+			const { exitCode, stdout } = await run(['sdk', 'uninstall', '99.99.99.GA', '--force']);
+
+			const output = stripColor(stdout);
+			expect(output).toMatch(/99\.99\.99\.GA\s+not found/);
+			expect(exitCode).toBe(0);
+		}));
+
+		it('should parse multiple version positionals and report each not found', initSDKHome(async ({ run }) => {
+			const { exitCode, stdout } = await run(['sdk', 'uninstall', '98.0.0.GA', '99.0.0.GA', '--force']);
+
+			const output = stripColor(stdout);
+			expect(output).toMatch(/98\.0\.0\.GA\s+not found/);
+			expect(output).toMatch(/99\.0\.0\.GA\s+not found/);
+			expect(exitCode).toBe(0);
+		}));
+	});
 });