diff --git a/src/llmling/config/runtime.py b/src/llmling/config/runtime.py
index f96a74a..2f569a7 100644
--- a/src/llmling/config/runtime.py
+++ b/src/llmling/config/runtime.py
@@ -89,7 +89,7 @@ def __init__(
         self._initialized = False
         # Register builtin processors
         proc = Jinja2Processor(config.global_settings.jinja_environment)
-        self._processor_registry.register("jinja_template", proc)
+        self._processor_registry["jinja_template"] = proc
         settings = self._config.global_settings
         self._dep_manager = depkit.DependencyManager(
             prefer_uv=settings.prefer_uv,
diff --git a/src/llmling/resources/loaders/registry.py b/src/llmling/resources/loaders/registry.py
index d518b63..70fce95 100644
--- a/src/llmling/resources/loaders/registry.py
+++ b/src/llmling/resources/loaders/registry.py
@@ -26,16 +26,16 @@
 class ResourceLoaderRegistry(BaseRegistry[str, ResourceLoader[Any]]):
     """Registry for context loaders."""
 
-    # def __init__(self) -> None:
-    #     """Initialize with default loaders."""
-    #     super().__init__()
-    #     # Always register defaults
-    #     self.register("image", ImageResourceLoader)
-    #     self.register("path", PathResourceLoader)
-    #     self.register("text", TextResourceLoader)
-    #     self.register("cli", CLIResourceLoader)
-    #     self.register("source", SourceResourceLoader)
-    #     self.register("callable", CallableResourceLoader)
+    def __init__(self, register_default_loaders: bool = False, **kwargs) -> None:
+        """Initialize registry.
+
+        Args:
+            register_default_loaders: Register default loaders on initialization.
+            kwargs: Additional keyword arguments passed to the parent class.
+        """
+        super().__init__(**kwargs)
+        if register_default_loaders:
+            self.register_default_loaders()
 
     @property
     def _error_class(self) -> type[exceptions.LoaderError]: