diff --git a/Abstracts/FileWatcher.php b/Abstracts/FileWatcher.php
index 1edb253..0f1939f 100644
--- a/Abstracts/FileWatcher.php
+++ b/Abstracts/FileWatcher.php
@@ -7,6 +7,7 @@ use Kiri\Di\Inject\Container;
 use Kiri\Error\StdoutLogger;
 use Kiri\Events\EventProvider;
 use Kiri\Router\Router;
+use Kiri\Router\RouteArtifactState;
 use Kiri\Server\Events\OnWorkerStart;
 use Kiri\Server\Processes\AbstractProcess;
 use Kiri\Server\Processes\OnProcessInterface;
@@ -298,7 +299,12 @@ class FileWatcher extends AbstractProcess implements OnProcessInterface
 			}
 
 			di(HotReloadState::class)->store($changedFiles);
-			di(StdoutLogger::class)->println('detected file changes, reloading server: ' . $preview);
+			di(StdoutLogger::class)->println('detected file changes, building hot reload artifacts: ' . $preview);
+
+			if (!$this->buildChangedFiles($changedFiles)) {
+				di(StdoutLogger::class)->println('hot reload build failed, keep old workers running');
+				return;
+			}
 
 			if (!$this->reloadWorkers()) {
 				di(StdoutLogger::class)->println('reload server failed: master pid not found or signal failed');
@@ -308,6 +314,54 @@ class FileWatcher extends AbstractProcess implements OnProcessInterface
 		}
 	}
 
+	private function buildChangedFiles(array $changedFiles): bool
+	{
+		$entry = $this->detectConsoleEntry();
+		if ($entry === null) {
+			di(StdoutLogger::class)->println('hot reload build failed: entry script not found');
+			return false;
+		}
+
+		$artifactType = defined('ROUTER_TYPE_HTTP') ? ROUTER_TYPE_HTTP : 'http';
+		$artifactState = di(RouteArtifactState::class);
+		$artifactState->clearBuild($artifactType);
+
+		$php = PHP_BINARY ?: 'php';
+		$command = escapeshellarg($php) . ' ' . escapeshellarg($entry) . ' sw:file-build';
+		$output = [];
+		$returnCode = 0;
+		exec($command . ' 2>&1', $output, $returnCode);
+
+		foreach ($output as $line) {
+			if ($line !== '') {
+				di(StdoutLogger::class)->println('[file-build] ' . $line);
+			}
+		}
+
+		if ($returnCode !== 0) {
+			return false;
+		}
+
+		return $artifactState->coversChangedFiles($artifactType, $changedFiles);
+	}
+
+	private function detectConsoleEntry(): ?string
+	{
+		$candidates = [
+			$_SERVER['SCRIPT_FILENAME'] ?? '',
+			defined('APP_PATH') ? APP_PATH . 'kiri.php' : '',
+			defined('APP_PATH') ? APP_PATH . 'bin/kiri' : '',
+			defined('APP_PATH') ? APP_PATH . 'artisan' : '',
+		];
+
+		foreach ($candidates as $candidate) {
+			if (is_string($candidate) && $candidate !== '' && is_file($candidate)) {
+				return $candidate;
+			}
+		}
+
+		return null;
+	}
 	private function invalidateChangedFiles(array $changedFiles): void
 	{
 		if (!function_exists('opcache_invalidate')) {
diff --git a/FileBuildCommand.php b/FileBuildCommand.php
new file mode 100644
index 0000000..2b6177d
--- /dev/null
+++ b/FileBuildCommand.php
@@ -0,0 +1,72 @@
+<?php
+declare(strict_types=1);
+
+namespace Kiri\Server;
+
+use Kiri\Di\HotReloadState;
+use Kiri\Router\RouteArtifactState;
+use Kiri\Router\Router;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Throwable;
+
+class FileBuildCommand extends Command
+{
+	protected function configure(): void
+	{
+		$this->setName('sw:file-build')
+		     ->setDescription('build hot reload artifacts for changed files');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int
+	{
+		defined('ROUTER_TYPE_HTTP') or define('ROUTER_TYPE_HTTP', 'http');
+		putenv('KIRI_FILE_BUILD=1');
+
+		$changedFiles = di(HotReloadState::class)->peek();
+		$startedAt = microtime(true);
+
+		try {
+			$syntaxError = $this->lintChangedFiles($changedFiles);
+			if ($syntaxError !== null) {
+				$output->writeln('<error>file build failed: ' . $syntaxError . '</error>');
+				return Command::FAILURE;
+			}
+
+			di(Router::class)->scan_build_route();
+			di(HotReloadState::class)->store($changedFiles);
+			di(RouteArtifactState::class)->markBuild(ROUTER_TYPE_HTTP, $changedFiles);
+
+			$elapsed = round((microtime(true) - $startedAt) * 1000, 2);
+			$output->writeln(sprintf('file build complete: %d changed files, %sms', count($changedFiles), $elapsed));
+			return Command::SUCCESS;
+		} catch (Throwable $throwable) {
+			if (class_exists('Kiri')) {
+				\Kiri::getLogger()->json_log($throwable);
+			}
+			$output->writeln('<error>file build failed: ' . $throwable->getMessage() . '</error>');
+			return Command::FAILURE;
+		} finally {
+			putenv('KIRI_FILE_BUILD');
+		}
+	}
+
+	private function lintChangedFiles(array $changedFiles): ?string
+	{
+		foreach ($changedFiles as $file) {
+			if (!is_string($file) || !str_ends_with($file, '.php') || !is_file($file)) {
+				continue;
+			}
+
+			$output = [];
+			$returnCode = 0;
+			exec(escapeshellarg(PHP_BINARY ?: 'php') . ' -l ' . escapeshellarg($file) . ' 2>&1', $output, $returnCode);
+			if ($returnCode !== 0) {
+				return implode("\n", $output);
+			}
+		}
+
+		return null;
+	}
+}
\ No newline at end of file
diff --git a/ServerProviders.php b/ServerProviders.php
index 1948bff..6193ae9 100644
--- a/ServerProviders.php
+++ b/ServerProviders.php
@@ -21,8 +21,10 @@ class ServerProviders extends Providers
     public function onImport(): void
     {
         $server = $this->container->get(ServerCommand::class);
+        $builder = $this->container->get(FileBuildCommand::class);
 
         $console = $this->container->get(Application::class);
         $console->addCommand($server);
+        $console->addCommand($builder);
     }
 }