diff --git a/src/StaticPHP/Command/Dev/IsInstalledCommand.php b/src/StaticPHP/Command/Dev/IsInstalledCommand.php
new file mode 100644
index 00000000..a3f69321
--- /dev/null
+++ b/src/StaticPHP/Command/Dev/IsInstalledCommand.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace StaticPHP\Command\Dev;
+
+use StaticPHP\Command\BaseCommand;
+use StaticPHP\Package\PackageInstaller;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Input\InputArgument;
+
+#[AsCommand('dev:is-installed', 'Check if a package is installed correctly', ['is-installed'], true)]
+class IsInstalledCommand extends BaseCommand
+{
+    public function configure(): void
+    {
+        $this->no_motd = true;
+        $this->addArgument('package', InputArgument::REQUIRED, 'The package name to check installation status');
+    }
+
+    public function handle(): int
+    {
+        $installer = new PackageInstaller();
+        $package = $this->input->getArgument('package');
+        $installer->addInstallPackage($package);
+        $installed = $installer->isPackageInstalled($package);
+        if ($installed) {
+            $this->output->writeln("<info>Package [{$package}] is installed correctly.</info>");
+            return static::SUCCESS;
+        }
+        $this->output->writeln("<error>Package [{$package}] is not installed.</error>");
+        return static::FAILURE;
+    }
+}
diff --git a/src/StaticPHP/Command/Dev/ShellCommand.php b/src/StaticPHP/Command/Dev/ShellCommand.php
new file mode 100644
index 00000000..560cc7fe
--- /dev/null
+++ b/src/StaticPHP/Command/Dev/ShellCommand.php
@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace StaticPHP\Command\Dev;
+
+use StaticPHP\Command\BaseCommand;
+use StaticPHP\Runtime\SystemTarget;
+use StaticPHP\Util\GlobalEnvManager;
+use Symfony\Component\Console\Attribute\AsCommand;
+
+#[AsCommand('dev:shell')]
+class ShellCommand extends BaseCommand
+{
+    public function handle(): int
+    {
+        // need to init global env first
+        GlobalEnvManager::afterInit();
+
+        $this->output->writeln("Entering interactive shell. Type 'exit' to leave.");
+
+        if (SystemTarget::isUnix()) {
+            passthru('PS1=\'[StaticPHP] > \' /bin/bash', $code);
+            return $code;
+        }
+        if (SystemTarget::getTargetOS() === 'Windows') {
+            passthru('cmd.exe', $code);
+            return $code;
+        }
+        $this->output->writeln('<error>Unsupported OS for shell command.</error>');
+        return static::FAILURE;
+    }
+}
diff --git a/src/StaticPHP/ConsoleApplication.php b/src/StaticPHP/ConsoleApplication.php
index 1f63190b..0484c111 100644
--- a/src/StaticPHP/ConsoleApplication.php
+++ b/src/StaticPHP/ConsoleApplication.php
@@ -6,6 +6,8 @@ namespace StaticPHP;
 
 use StaticPHP\Command\BuildLibsCommand;
 use StaticPHP\Command\BuildTargetCommand;
+use StaticPHP\Command\Dev\IsInstalledCommand;
+use StaticPHP\Command\Dev\ShellCommand;
 use StaticPHP\Command\DoctorCommand;
 use StaticPHP\Command\DownloadCommand;
 use StaticPHP\Command\ExtractCommand;
@@ -47,6 +49,10 @@ class ConsoleApplication extends Application
             new BuildLibsCommand(),
             new ExtractCommand(),
             new SPCConfigCommand(),
+
+            // dev commands
+            new ShellCommand(),
+            new IsInstalledCommand(),
         ]);
 
         // add additional commands from registries