diff --git a/src/Mcp/Tool/Task/CreateTaskRecurrenceTool.php b/src/Mcp/Tool/Task/CreateTaskRecurrenceTool.php
new file mode 100644
index 0000000..499e687
--- /dev/null
+++ b/src/Mcp/Tool/Task/CreateTaskRecurrenceTool.php
@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Task;
+
+use App\Entity\TaskRecurrence;
+use App\Enum\RecurrenceType;
+use App\Repository\TaskRepository;
+use App\Service\CalDavService;
+use DateTimeImmutable;
+use Doctrine\ORM\EntityManagerInterface;
+use InvalidArgumentException;
+use Mcp\Capability\Attribute\McpTool;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+
+use function sprintf;
+
+#[McpTool(name: 'create-task-recurrence', description: 'Create a recurrence pattern for a task. Type: daily, weekly, monthly, yearly. For weekly, provide daysOfWeek array (e.g. ["monday","wednesday"]). For monthly, provide dayOfMonth OR weekOfMonth.')]
+class CreateTaskRecurrenceTool
+{
+    public function __construct(
+        private readonly EntityManagerInterface $entityManager,
+        private readonly TaskRepository $taskRepository,
+        private readonly Security $security,
+        private readonly CalDavService $calDavService,
+    ) {}
+
+    public function __invoke(
+        int $taskId,
+        string $type,
+        int $interval = 1,
+        ?array $daysOfWeek = null,
+        ?int $dayOfMonth = null,
+        ?int $weekOfMonth = null,
+        ?string $endDate = null,
+        ?int $maxOccurrences = null,
+    ): string {
+        if (!$this->security->isGranted('ROLE_USER')) {
+            throw new AccessDeniedException('Access denied: ROLE_USER required.');
+        }
+
+        $task = $this->taskRepository->find($taskId);
+        if (null === $task) {
+            throw new InvalidArgumentException(sprintf('Task with ID %d not found.', $taskId));
+        }
+
+        $recurrenceType = RecurrenceType::from($type);
+
+        $recurrence = new TaskRecurrence();
+        $recurrence->setType($recurrenceType);
+        $recurrence->setInterval($interval);
+
+        if (null !== $daysOfWeek) {
+            $recurrence->setDaysOfWeek($daysOfWeek);
+        }
+        if (null !== $dayOfMonth) {
+            $recurrence->setDayOfMonth($dayOfMonth);
+        }
+        if (null !== $weekOfMonth) {
+            $recurrence->setWeekOfMonth($weekOfMonth);
+        }
+        if (null !== $endDate) {
+            $recurrence->setEndDate(new DateTimeImmutable($endDate));
+        }
+        if (null !== $maxOccurrences) {
+            $recurrence->setMaxOccurrences($maxOccurrences);
+        }
+
+        $task->setRecurrence($recurrence);
+        $this->entityManager->persist($recurrence);
+        $this->entityManager->flush();
+
+        $this->calDavService->syncTask($task);
+        $this->entityManager->flush();
+
+        return json_encode([
+            'id'             => $recurrence->getId(),
+            'type'           => $recurrence->getType()?->value,
+            'interval'       => $recurrence->getInterval(),
+            'daysOfWeek'     => $recurrence->getDaysOfWeek(),
+            'dayOfMonth'     => $recurrence->getDayOfMonth(),
+            'weekOfMonth'    => $recurrence->getWeekOfMonth(),
+            'endDate'        => $recurrence->getEndDate()?->format('Y-m-d'),
+            'maxOccurrences' => $recurrence->getMaxOccurrences(),
+            'taskId'         => $task->getId(),
+        ]);
+    }
+}
diff --git a/src/Mcp/Tool/Task/CreateTaskTool.php b/src/Mcp/Tool/Task/CreateTaskTool.php
index 32a7568..3c74934 100644
--- a/src/Mcp/Tool/Task/CreateTaskTool.php
+++ b/src/Mcp/Tool/Task/CreateTaskTool.php
@@ -14,6 +14,8 @@ use App\Repository\TaskRepository;
 use App\Repository\TaskStatusRepository;
 use App\Repository\TaskTagRepository;
 use App\Repository\UserRepository;
+use App\Service\CalDavService;
+use DateTimeImmutable;
 use Doctrine\ORM\EntityManagerInterface;
 use InvalidArgumentException;
 use Mcp\Capability\Attribute\McpTool;
@@ -36,6 +38,7 @@ class CreateTaskTool
         private readonly TaskTagRepository $taskTagRepository,
         private readonly UserRepository $userRepository,
         private readonly Security $security,
+        private readonly CalDavService $calDavService,
     ) {}
 
     public function __invoke(
@@ -48,6 +51,10 @@ class CreateTaskTool
         ?int $assigneeId = null,
         ?int $groupId = null,
         ?array $tagIds = null,
+        ?string $scheduledStart = null,
+        ?string $scheduledEnd = null,
+        ?string $deadline = null,
+        ?bool $syncToCalendar = null,
     ): string {
         if (!$this->security->isGranted('ROLE_USER')) {
             throw new AccessDeniedException('Access denied: ROLE_USER required.');
@@ -109,6 +116,18 @@ class CreateTaskTool
                 $task->addTag($tag);
             }
         }
+        if (null !== $scheduledStart) {
+            $task->setScheduledStart(new DateTimeImmutable($scheduledStart));
+        }
+        if (null !== $scheduledEnd) {
+            $task->setScheduledEnd(new DateTimeImmutable($scheduledEnd));
+        }
+        if (null !== $deadline) {
+            $task->setDeadline(new DateTimeImmutable($deadline));
+        }
+        if (null !== $syncToCalendar) {
+            $task->setSyncToCalendar($syncToCalendar);
+        }
 
         $this->entityManager->wrapInTransaction(function () use ($task, $project): void {
             $task->setNumber($this->taskRepository->findMaxNumberByProjectForUpdate($project) + 1);
@@ -116,19 +135,26 @@ class CreateTaskTool
             $this->entityManager->flush();
         });
 
+        $this->calDavService->syncTask($task);
+        $this->entityManager->flush();
+
         return json_encode([
-            'id'          => $task->getId(),
-            'number'      => $task->getNumber(),
-            'title'       => $task->getTitle(),
-            'description' => $task->getDescription(),
-            'status'      => Serializer::status($task->getStatus()),
-            'priority'    => Serializer::priority($task->getPriority()),
-            'effort'      => Serializer::effort($task->getEffort()),
-            'assignee'    => Serializer::user($task->getAssignee()),
-            'group'       => Serializer::groupRef($task->getGroup()),
-            'project'     => Serializer::projectRef($project),
-            'tags'        => Serializer::tags($task->getTags()),
-            'archived'    => $task->isArchived(),
+            'id'             => $task->getId(),
+            'number'         => $task->getNumber(),
+            'title'          => $task->getTitle(),
+            'description'    => $task->getDescription(),
+            'status'         => Serializer::status($task->getStatus()),
+            'priority'       => Serializer::priority($task->getPriority()),
+            'effort'         => Serializer::effort($task->getEffort()),
+            'assignee'       => Serializer::user($task->getAssignee()),
+            'group'          => Serializer::groupRef($task->getGroup()),
+            'project'        => Serializer::projectRef($project),
+            'tags'           => Serializer::tags($task->getTags()),
+            'archived'       => $task->isArchived(),
+            'scheduledStart' => $task->getScheduledStart()?->format('c'),
+            'scheduledEnd'   => $task->getScheduledEnd()?->format('c'),
+            'deadline'       => $task->getDeadline()?->format('c'),
+            'syncToCalendar' => $task->isSyncToCalendar(),
         ]);
     }
 }
diff --git a/src/Mcp/Tool/Task/DeleteTaskRecurrenceTool.php b/src/Mcp/Tool/Task/DeleteTaskRecurrenceTool.php
new file mode 100644
index 0000000..4039fff
--- /dev/null
+++ b/src/Mcp/Tool/Task/DeleteTaskRecurrenceTool.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Task;
+
+use App\Repository\TaskRecurrenceRepository;
+use App\Service\CalDavService;
+use Doctrine\ORM\EntityManagerInterface;
+use InvalidArgumentException;
+use Mcp\Capability\Attribute\McpTool;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+
+use function sprintf;
+
+#[McpTool(name: 'delete-task-recurrence', description: 'Delete a task recurrence pattern. Nullifies the recurrence on the active task and removes the recurring calendar event.')]
+class DeleteTaskRecurrenceTool
+{
+    public function __construct(
+        private readonly EntityManagerInterface $entityManager,
+        private readonly TaskRecurrenceRepository $taskRecurrenceRepository,
+        private readonly Security $security,
+        private readonly CalDavService $calDavService,
+    ) {}
+
+    public function __invoke(int $recurrenceId): string
+    {
+        if (!$this->security->isGranted('ROLE_USER')) {
+            throw new AccessDeniedException('Access denied: ROLE_USER required.');
+        }
+
+        $recurrence = $this->taskRecurrenceRepository->find($recurrenceId);
+        if (null === $recurrence) {
+            throw new InvalidArgumentException(sprintf('TaskRecurrence with ID %d not found.', $recurrenceId));
+        }
+
+        $tasks = $recurrence->getTasks()->toArray();
+
+        $eventUidToDelete = null;
+        foreach ($tasks as $task) {
+            if (null !== $task->getCalendarEventUid()) {
+                $eventUidToDelete = $task->getCalendarEventUid();
+
+                break;
+            }
+        }
+
+        foreach ($tasks as $task) {
+            $task->setRecurrence(null);
+        }
+
+        $this->entityManager->remove($recurrence);
+        $this->entityManager->flush();
+
+        if (null !== $eventUidToDelete) {
+            $this->calDavService->deleteEvent($eventUidToDelete);
+        }
+
+        return json_encode([
+            'success'      => true,
+            'message'      => sprintf('TaskRecurrence %d deleted.', $recurrenceId),
+            'tasksUpdated' => count($tasks),
+        ]);
+    }
+}
diff --git a/src/Mcp/Tool/Task/DeleteTaskTool.php b/src/Mcp/Tool/Task/DeleteTaskTool.php
index 7c8644a..fa006a3 100644
--- a/src/Mcp/Tool/Task/DeleteTaskTool.php
+++ b/src/Mcp/Tool/Task/DeleteTaskTool.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace App\Mcp\Tool\Task;
 
 use App\Repository\TaskRepository;
+use App\Service\CalDavService;
 use Doctrine\ORM\EntityManagerInterface;
 use InvalidArgumentException;
 use Mcp\Capability\Attribute\McpTool;
@@ -20,6 +21,7 @@ class DeleteTaskTool
         private readonly TaskRepository $taskRepository,
         private readonly EntityManagerInterface $entityManager,
         private readonly Security $security,
+        private readonly CalDavService $calDavService,
     ) {}
 
     public function __invoke(int $id): string
@@ -35,9 +37,18 @@ class DeleteTaskTool
         }
 
         $taskCode = $task->getProject()->getCode().'-'.$task->getNumber();
+        $eventUid = $task->getCalendarEventUid();
+        $todoUid  = $task->getCalendarTodoUid();
         $this->entityManager->remove($task);
         $this->entityManager->flush();
 
+        if (null !== $eventUid) {
+            $this->calDavService->deleteEvent($eventUid);
+        }
+        if (null !== $todoUid) {
+            $this->calDavService->deleteTodo($todoUid);
+        }
+
         return json_encode([
             'success' => true,
             'message' => sprintf('Task %s deleted.', $taskCode),
diff --git a/src/Mcp/Tool/Task/UpdateTaskRecurrenceTool.php b/src/Mcp/Tool/Task/UpdateTaskRecurrenceTool.php
new file mode 100644
index 0000000..ae03b4f
--- /dev/null
+++ b/src/Mcp/Tool/Task/UpdateTaskRecurrenceTool.php
@@ -0,0 +1,88 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mcp\Tool\Task;
+
+use App\Enum\RecurrenceType;
+use App\Repository\TaskRecurrenceRepository;
+use App\Service\CalDavService;
+use DateTimeImmutable;
+use Doctrine\ORM\EntityManagerInterface;
+use InvalidArgumentException;
+use Mcp\Capability\Attribute\McpTool;
+use Symfony\Bundle\SecurityBundle\Security;
+use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+
+use function sprintf;
+
+#[McpTool(name: 'update-task-recurrence', description: 'Update an existing task recurrence pattern.')]
+class UpdateTaskRecurrenceTool
+{
+    public function __construct(
+        private readonly EntityManagerInterface $entityManager,
+        private readonly TaskRecurrenceRepository $taskRecurrenceRepository,
+        private readonly Security $security,
+        private readonly CalDavService $calDavService,
+    ) {}
+
+    public function __invoke(
+        int $recurrenceId,
+        ?string $type = null,
+        ?int $interval = null,
+        ?array $daysOfWeek = null,
+        ?int $dayOfMonth = null,
+        ?int $weekOfMonth = null,
+        ?string $endDate = null,
+        ?int $maxOccurrences = null,
+    ): string {
+        if (!$this->security->isGranted('ROLE_USER')) {
+            throw new AccessDeniedException('Access denied: ROLE_USER required.');
+        }
+
+        $recurrence = $this->taskRecurrenceRepository->find($recurrenceId);
+        if (null === $recurrence) {
+            throw new InvalidArgumentException(sprintf('TaskRecurrence with ID %d not found.', $recurrenceId));
+        }
+
+        if (null !== $type) {
+            $recurrence->setType(RecurrenceType::from($type));
+        }
+        if (null !== $interval) {
+            $recurrence->setInterval($interval);
+        }
+        if (null !== $daysOfWeek) {
+            $recurrence->setDaysOfWeek($daysOfWeek);
+        }
+        if (null !== $dayOfMonth) {
+            $recurrence->setDayOfMonth($dayOfMonth);
+        }
+        if (null !== $weekOfMonth) {
+            $recurrence->setWeekOfMonth($weekOfMonth);
+        }
+        if (null !== $endDate) {
+            $recurrence->setEndDate(new DateTimeImmutable($endDate));
+        }
+        if (null !== $maxOccurrences) {
+            $recurrence->setMaxOccurrences($maxOccurrences);
+        }
+
+        $this->entityManager->flush();
+
+        foreach ($recurrence->getTasks() as $task) {
+            $this->calDavService->syncTask($task);
+        }
+        $this->entityManager->flush();
+
+        return json_encode([
+            'id'             => $recurrence->getId(),
+            'type'           => $recurrence->getType()?->value,
+            'interval'       => $recurrence->getInterval(),
+            'daysOfWeek'     => $recurrence->getDaysOfWeek(),
+            'dayOfMonth'     => $recurrence->getDayOfMonth(),
+            'weekOfMonth'    => $recurrence->getWeekOfMonth(),
+            'endDate'        => $recurrence->getEndDate()?->format('Y-m-d'),
+            'maxOccurrences' => $recurrence->getMaxOccurrences(),
+        ]);
+    }
+}
diff --git a/src/Mcp/Tool/Task/UpdateTaskTool.php b/src/Mcp/Tool/Task/UpdateTaskTool.php
index 4f8efbc..ed67b72 100644
--- a/src/Mcp/Tool/Task/UpdateTaskTool.php
+++ b/src/Mcp/Tool/Task/UpdateTaskTool.php
@@ -12,6 +12,8 @@ use App\Repository\TaskRepository;
 use App\Repository\TaskStatusRepository;
 use App\Repository\TaskTagRepository;
 use App\Repository\UserRepository;
+use App\Service\CalDavService;
+use DateTimeImmutable;
 use Doctrine\ORM\EntityManagerInterface;
 use InvalidArgumentException;
 use Mcp\Capability\Attribute\McpTool;
@@ -33,6 +35,7 @@ class UpdateTaskTool
         private readonly TaskTagRepository $taskTagRepository,
         private readonly UserRepository $userRepository,
         private readonly Security $security,
+        private readonly CalDavService $calDavService,
     ) {}
 
     public function __invoke(
@@ -46,6 +49,10 @@ class UpdateTaskTool
         ?int $groupId = null,
         ?array $tagIds = null,
         ?bool $archived = null,
+        ?string $scheduledStart = null,
+        ?string $scheduledEnd = null,
+        ?string $deadline = null,
+        ?bool $syncToCalendar = null,
     ): string {
         if (!$this->security->isGranted('ROLE_USER')) {
             throw new AccessDeniedException('Access denied: ROLE_USER required.');
@@ -114,22 +121,40 @@ class UpdateTaskTool
         if (null !== $archived) {
             $task->setArchived($archived);
         }
+        if (null !== $scheduledStart) {
+            $task->setScheduledStart(new DateTimeImmutable($scheduledStart));
+        }
+        if (null !== $scheduledEnd) {
+            $task->setScheduledEnd(new DateTimeImmutable($scheduledEnd));
+        }
+        if (null !== $deadline) {
+            $task->setDeadline(new DateTimeImmutable($deadline));
+        }
+        if (null !== $syncToCalendar) {
+            $task->setSyncToCalendar($syncToCalendar);
+        }
 
+        $this->entityManager->flush();
+        $this->calDavService->syncTask($task);
         $this->entityManager->flush();
 
         return json_encode([
-            'id'          => $task->getId(),
-            'number'      => $task->getNumber(),
-            'title'       => $task->getTitle(),
-            'description' => $task->getDescription(),
-            'status'      => Serializer::status($task->getStatus()),
-            'priority'    => Serializer::priority($task->getPriority()),
-            'effort'      => Serializer::effort($task->getEffort()),
-            'assignee'    => Serializer::user($task->getAssignee()),
-            'group'       => Serializer::groupRef($task->getGroup()),
-            'project'     => Serializer::projectRef($task->getProject()),
-            'tags'        => Serializer::tags($task->getTags()),
-            'archived'    => $task->isArchived(),
+            'id'             => $task->getId(),
+            'number'         => $task->getNumber(),
+            'title'          => $task->getTitle(),
+            'description'    => $task->getDescription(),
+            'status'         => Serializer::status($task->getStatus()),
+            'priority'       => Serializer::priority($task->getPriority()),
+            'effort'         => Serializer::effort($task->getEffort()),
+            'assignee'       => Serializer::user($task->getAssignee()),
+            'group'          => Serializer::groupRef($task->getGroup()),
+            'project'        => Serializer::projectRef($task->getProject()),
+            'tags'           => Serializer::tags($task->getTags()),
+            'archived'       => $task->isArchived(),
+            'scheduledStart' => $task->getScheduledStart()?->format('c'),
+            'scheduledEnd'   => $task->getScheduledEnd()?->format('c'),
+            'deadline'       => $task->getDeadline()?->format('c'),
+            'syncToCalendar' => $task->isSyncToCalendar(),
         ]);
     }
 }