diff --git a/src/cdf/injector/registry.py b/src/cdf/injector/registry.py
index b72b83a..b5ca2e4 100644
--- a/src/cdf/injector/registry.py
+++ b/src/cdf/injector/registry.py
@@ -24,10 +24,12 @@ class DependencyCycleError(Exception):
 
 
 class DependencyRegistry:
+    lc = Lifecycle
+
     def __init__(self) -> None:
-        self._dependencies = {}
+        """Initialize the registry."""
         self._singletons = {}
-        self._wired = set()
+        self._dependencies = {}
         self._resolving = set()
 
     def add(
@@ -35,7 +37,6 @@ def add(
         name: str,
         dependency: t.Any,
         lifecycle=Lifecycle.INSTANCE,
-        recursive: bool = True,
         **lazy_kwargs: t.Any,
     ) -> None:
         """Register a dependency with the container."""
@@ -44,15 +45,31 @@ def add(
                 "Cannot pass kwargs for instance dependencies. "
                 "Please use prototype or singleton."
             )
-        if recursive:
-            dependency = self.inject_defaults(dependency)
+        if name in self._dependencies:
+            raise ValueError(f'Dependency "{name}" is already registered')
         self._dependencies[name] = (dependency, lifecycle, lazy_kwargs)
 
+    def remove(self, name: str) -> None:
+        """Remove a dependency from the container."""
+        if name in self._dependencies:
+            del self._dependencies[name]
+        if name in self._singletons:
+            del self._singletons[name]
+
+    def clear(self) -> None:
+        """Clear all dependencies and singletons."""
+        self._dependencies.clear()
+        self._singletons.clear()
+
+    def has(self, name: str) -> bool:
+        """Check if a dependency is registered."""
+        return name in self._dependencies
+
     def get(self, name: str, must_exist: bool = False) -> t.Any:
         """Get a dependency"""
         if name not in self._dependencies:
             if must_exist:
-                raise ValueError(f'Dependency "{name}" is not registered')
+                raise KeyError(f'Dependency "{name}" is not registered')
             return None
 
         if name in self._resolving:
@@ -84,10 +101,30 @@ def get(self, name: str, must_exist: bool = False) -> t.Any:
         else:
             raise ValueError(f"Unknown lifecycle: {lifecycle}")
 
+    def __contains__(self, name: str) -> bool:
+        """Check if a dependency is registered."""
+        return self.has(name)
+
+    def __getitem__(self, name: str) -> t.Any:
+        """Get a dependency. Raises KeyError if not found."""
+        return self.get(name, must_exist=True)
+
+    def __setitem__(self, name: str, dependency: t.Any) -> None:
+        """Add a dependency. Defaults to singleton lifecycle if callable, else instance."""
+        self.add(
+            name,
+            dependency,
+            Lifecycle.SINGLETON if callable(dependency) else Lifecycle.INSTANCE,
+        )
+
+    def __delitem__(self, name: str) -> None:
+        """Remove a dependency."""
+        self.remove(name)
+
     def inject_defaults(self, func_or_cls: t.Callable[P, T]) -> t.Callable[P, T]:
         """Inject dependencies into a function."""
         _instance = unwrap(func_or_cls)
-        if id(_instance) in self._wired or not callable(func_or_cls):
+        if not callable(func_or_cls):
             return func_or_cls
 
         sig = signature(func_or_cls)
@@ -102,7 +139,6 @@ def wrapper(*args: P.args, **kwargs: P.kwargs) -> T:
                         bound_args.arguments[name] = dependency
             return func_or_cls(*bound_args.args, **bound_args.kwargs)
 
-        self._wired.add(id(_instance))
         return wrapper
 
     def wire(self, func_or_cls: t.Callable[P, T]) -> t.Callable[..., T]:
@@ -123,6 +159,26 @@ def recursive_inject(func: t.Callable[P, T]) -> t.Callable[P, T]:
 
         return recursive_inject(func_or_cls)
 
+    def __call__(
+        self, func_or_cls: t.Callable[P, T], *args: t.Any, **kwargs: t.Any
+    ) -> T:
+        """Invoke a callable with dependencies injected from the registry."""
+        return self.wire(func_or_cls)(*args, **kwargs)
+
+    def __iter__(self) -> t.Iterator[str]:
+        """Iterate over dependency names."""
+        return iter(self._dependencies)
+
+    def __len__(self) -> int:
+        """Return the number of dependencies."""
+        return len(self._dependencies)
+
+    def __repr__(self) -> str:
+        return f"<DependencyRegistry {self._dependencies.keys()}>"
+
+    def __str__(self) -> str:
+        return repr(self)
+
 
 GLOBAL_REGISTRY = DependencyRegistry()
 
diff --git a/src/cdf/v2/__init__.py b/src/cdf/v2/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/cdf/v2/workspace.py b/src/cdf/v2/workspace.py
new file mode 100644
index 0000000..de05058
--- /dev/null
+++ b/src/cdf/v2/workspace.py
@@ -0,0 +1,24 @@
+from cdf.injector.registry import DependencyRegistry
+
+r = DependencyRegistry()
+r.add("a", lambda: 1, r.lc.SINGLETON)
+r.add("b", lambda a: a + 1, r.lc.SINGLETON)
+r.add("obj_proto", object, r.lc.PROTOTYPE)
+r.add("obj_singleton", object, r.lc.SINGLETON)
+
+
+def foo(a: int, b: int, c: int = 0) -> int:
+    return a + b
+
+
+foo_wired = r.wire(foo)
+
+assert foo_wired() == 3
+assert foo_wired(1) == 3
+assert foo_wired(2) == 4
+assert foo_wired(3, 3) == 6
+
+assert r.get("obj_proto") is not r.get("obj_proto")
+assert r.get("obj_singleton") is r.get("obj_singleton")
+
+assert r(foo) == 3