diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ee683f..5b5041c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+2.2.0
+=====
+
+* (feature) Add app validator to ensure, that all tasks are properly configured in the routing.
+
+
 2.1.1
 =====
 
diff --git a/composer.json b/composer.json
index c45ce3b..eee78bd 100644
--- a/composer.json
+++ b/composer.json
@@ -14,6 +14,7 @@
 		"php": ">= 8.4",
 		"21torr/bundle-helpers": "^2.3",
 		"21torr/cli": "^1.2.3",
+		"21torr/hosting": "^4.0",
 		"21torr/snail": "^1.0.0",
 		"doctrine/doctrine-bundle": "^2.14",
 		"doctrine/orm": "^3.3",
@@ -22,7 +23,7 @@
 		"symfony/config": "^7.2",
 		"symfony/console": "^7.2",
 		"symfony/dependency-injection": "^7.2",
-		"symfony/event-dispatcher-contracts": "^3.5",
+		"symfony/event-dispatcher": "^7.3",
 		"symfony/http-kernel": "^7.2",
 		"symfony/messenger": "^7.2",
 		"symfony/scheduler": "^7.2",
diff --git a/src/App/AppValidator/TaskManagerAppValidator.php b/src/App/AppValidator/TaskManagerAppValidator.php
new file mode 100644
index 0000000..1d1cfae
--- /dev/null
+++ b/src/App/AppValidator/TaskManagerAppValidator.php
@@ -0,0 +1,69 @@
+<?php declare(strict_types=1);
+
+namespace Torr\TaskManager\App\AppValidator;
+
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+use Symfony\Component\EventDispatcher\Attribute\AsEventListener;
+use Symfony\Component\Messenger\Envelope;
+use Symfony\Component\Messenger\Transport\Sender\SendersLocatorInterface;
+use Torr\Hosting\Event\ValidateAppEvent;
+use Torr\TaskManager\Config\BundleConfig;
+
+/**
+ * @final
+ */
+readonly class TaskManagerAppValidator
+{
+	/**
+	 */
+	public function __construct (
+		private BundleConfig $bundleConfig,
+		#[Autowire(service: "messenger.senders_locator")]
+		private SendersLocatorInterface $sendersLocator,
+	) {}
+
+	/**
+	 */
+	#[AsEventListener]
+	public function onValidateApp (ValidateAppEvent $event) : void
+	{
+		$io = $event->io;
+		$io->section("Task Manager: Check that all Tasks have Transports");
+
+		$taskClasses = $this->bundleConfig->taskClasses;
+		$io->comment(\sprintf(
+			"Found <fg=blue>%d %s</>:",
+			\count($taskClasses),
+			1 !== \count($taskClasses) ? "tasks" : "task",
+		));
+
+		$allHaveSenders = true;
+
+		foreach ($taskClasses as $taskClass)
+		{
+			$task = new \ReflectionClass($taskClass)->newInstanceWithoutConstructor();
+			$envelope = Envelope::wrap($task);
+
+			$senders = iterator_to_array($this->sendersLocator->getSenders($envelope));
+			$taskHasSenders = [] !== $senders;
+
+			$io->writeln(\sprintf(
+				"• %s ... %s",
+				$taskClass,
+				$taskHasSenders ? "<fg=green>ok</>" : "<fg=red>not mapped</>",
+			));
+
+			$allHaveSenders = $allHaveSenders && $taskHasSenders;
+		}
+
+		if ($allHaveSenders)
+		{
+			$io->success("All tasks configured correctly.");
+
+			return;
+		}
+
+		$io->error("Not all tasks are configured correctly.");
+		$event->markAppAsInvalid("Task Manager: not all tasks have routing");
+	}
+}
diff --git a/src/Config/BundleConfig.php b/src/Config/BundleConfig.php
index b8201c9..d20a0b8 100644
--- a/src/Config/BundleConfig.php
+++ b/src/Config/BundleConfig.php
@@ -11,5 +11,7 @@ public function __construct (
 		public array $sortedQueues,
 		/** @var string[] */
 		public array $failureTransports = [],
+		/** @var class-string[] */
+		public array $taskClasses = [],
 	) {}
 }
diff --git a/src/DependencyInjection/AutoDetectFailureTransportsCompilerInterface.php b/src/DependencyInjection/AutoDetectFailureTransportsCompilerPass.php
similarity index 92%
rename from src/DependencyInjection/AutoDetectFailureTransportsCompilerInterface.php
rename to src/DependencyInjection/AutoDetectFailureTransportsCompilerPass.php
index dc93240..f894f3e 100644
--- a/src/DependencyInjection/AutoDetectFailureTransportsCompilerInterface.php
+++ b/src/DependencyInjection/AutoDetectFailureTransportsCompilerPass.php
@@ -9,7 +9,7 @@
 /**
  * Integrates into symfony/messenger, by automatically detecting the failure transports
  */
-final class AutoDetectFailureTransportsCompilerInterface implements CompilerPassInterface
+final class AutoDetectFailureTransportsCompilerPass implements CompilerPassInterface
 {
 	/**
 	 * @inheritDoc
diff --git a/src/DependencyInjection/FindTaskClassesCompilerPass.php b/src/DependencyInjection/FindTaskClassesCompilerPass.php
new file mode 100644
index 0000000..970d2c0
--- /dev/null
+++ b/src/DependencyInjection/FindTaskClassesCompilerPass.php
@@ -0,0 +1,44 @@
+<?php declare(strict_types=1);
+
+namespace Torr\TaskManager\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Torr\TaskManager\Config\BundleConfig;
+
+/**
+ * Compiler pass, that collects all tasks from the container that are from the app
+ * itself (= in the App\ namespace).
+ *
+ * @final
+ */
+readonly class FindTaskClassesCompilerPass implements CompilerPassInterface
+{
+	/**
+	 *
+	 */
+	#[\Override]
+	public function process (ContainerBuilder $container) : void
+	{
+		$taskClasses = [];
+
+		foreach ($container->findTaggedServiceIds("task-manager.task") as $taskServiceId => $config)
+		{
+			$definition = $container->getDefinition($taskServiceId);
+			$taskFQCN = $definition->getClass();
+
+			if (null !== $taskFQCN && str_starts_with($taskFQCN, "App\\"))
+			{
+				$taskClasses[] = $taskFQCN;
+			}
+
+			// Remove task service definition, as these must never be a service
+			// in the actual runtime. We just use the mechanism to collect all
+			// tasks in the app.
+			$container->removeDefinition($taskServiceId);
+		}
+
+		$container->getDefinition(BundleConfig::class)
+			->setArgument('$taskClasses', $taskClasses);
+	}
+}
diff --git a/src/TaskManagerBundle.php b/src/TaskManagerBundle.php
index 49f2972..51833d2 100644
--- a/src/TaskManagerBundle.php
+++ b/src/TaskManagerBundle.php
@@ -7,9 +7,11 @@
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 use Torr\BundleHelpers\Bundle\ConfigurableBundleExtension;
 use Torr\TaskManager\Config\BundleConfig;
-use Torr\TaskManager\DependencyInjection\AutoDetectFailureTransportsCompilerInterface;
+use Torr\TaskManager\DependencyInjection\AutoDetectFailureTransportsCompilerPass;
+use Torr\TaskManager\DependencyInjection\FindTaskClassesCompilerPass;
 use Torr\TaskManager\DependencyInjection\TaskManagerBundleConfiguration;
 use Torr\TaskManager\Log\LogCleaner;
+use Torr\TaskManager\Task\Task;
 
 final class TaskManagerBundle extends Bundle
 {
@@ -45,7 +47,12 @@ static function (array $config, ContainerBuilder $container) : void
 	 */
 	public function build (ContainerBuilder $container) : void
 	{
-		$container->addCompilerPass(new AutoDetectFailureTransportsCompilerInterface());
+		$container
+			->addCompilerPass(new AutoDetectFailureTransportsCompilerPass())
+			->addCompilerPass(new FindTaskClassesCompilerPass());
+
+		$container->registerForAutoconfiguration(Task::class)
+			->addTag("task-manager.task");
 	}
 
 	/**