diff --git a/src/Configuration.php b/src/Configuration.php
new file mode 100644
index 0000000..2aacd2b
--- /dev/null
+++ b/src/Configuration.php
@@ -0,0 +1,114 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ghostwriter\Arm;
+
+use Ghostwriter\Arm\Configuration\List\OwnerList;
+use Ghostwriter\Arm\Configuration\List\RepositoryList;
+use Ghostwriter\Arm\Configuration\List\SkippedRepositoryList;
+use Ghostwriter\Arm\Configuration\List\SkippedTopicList;
+use Ghostwriter\Arm\Configuration\List\TaskList;
+use Ghostwriter\Arm\Interface\TaskInterface;
+use Ghostwriter\Arm\Interface\WorkspaceInterface;
+
+use function array_diff;
+use function array_merge;
+use function getcwd;
+use function sys_get_temp_dir;
+
+final readonly class Configuration
+{
+    public function __construct(
+        private OwnerList $ownerList,
+        private RepositoryList $repositoryList,
+        private SkippedRepositoryList $skippedRepositoryList,
+        private SkippedTopicList $skippedTopicList,
+        private TaskList $taskList,
+        private WorkspaceInterface $workspace,
+    ) {
+    }
+
+    public function owners(string ...$owners): self
+    {
+        $this->ownerList->add(...$owners);
+
+        return $this;
+    }
+
+    public function packages(): array
+    {
+        $repositories = $this->repositoryList->toArray();
+
+        foreach ($this->ownerList->toArray() as $organization) {
+            $repositories = array_merge($repositories, $organization->repositories());
+        }
+
+        return array_diff($repositories, $this->skippedRepositoryList->toArray());
+    }
+
+    public function repositories(string ...$repositories): self
+    {
+        $this->repositoryList->add(...$repositories);
+
+        return $this;
+    }
+
+    public function repositoryList(): RepositoryList
+    {
+        return $this->repositoryList;
+    }
+
+    public function skip(string ...$repositories): self
+    {
+        $this->skippedRepositoryList->add(...$repositories);
+
+        return $this;
+    }
+
+    public function skipTopics(string ...$topics): self
+    {
+        $this->skippedTopicList->add(...$topics);
+
+        return $this;
+    }
+
+    public function taskList(): TaskList
+    {
+        return $this->taskList;
+    }
+
+    /**
+     * @param array<class-string<TaskInterface>,array<string,array<string,string>|string>> $tasks
+     *
+     * @return $this
+     */
+    public function tasks(array $tasks): self
+    {
+        $this->taskList->add($tasks);
+
+        return $this;
+    }
+
+    public function workspace(): WorkspaceInterface
+    {
+        return $this->workspace;
+    }
+
+    public static function new(?string $workingDirectory = null): self
+    {
+        $workingDirectory = match ($workingDirectory) {
+            null => getcwd() ?: sys_get_temp_dir(),
+            default => $workingDirectory,
+        };
+
+        return new self(
+            OwnerList::new(),
+            RepositoryList::new(),
+            SkippedRepositoryList::new(),
+            SkippedTopicList::new(),
+            TaskList::new(),
+            Workspace::new($workingDirectory),
+        );
+    }
+}