diff --git a/royalnet/engineer/discard.py b/royalnet/engineer/discard.py
index e9167e62..39daaff0 100644
--- a/royalnet/engineer/discard.py
+++ b/royalnet/engineer/discard.py
@@ -11,3 +11,8 @@ class Discard(BaseException):
 
     def __str__(self):
         return f"Discarded {self.obj}: {self.message}"
+
+
+__all__ = (
+    "Discard",
+)
diff --git a/royalnet/engineer/dispenser.py b/royalnet/engineer/dispenser.py
index d3413dd7..642d64c3 100644
--- a/royalnet/engineer/dispenser.py
+++ b/royalnet/engineer/dispenser.py
@@ -49,3 +49,8 @@ class Dispenser:
 
             while True:
                 state = await state
+
+
+__all__ = (
+    "Dispenser",
+)
diff --git a/royalnet/engineer/exc.py b/royalnet/engineer/exc.py
index ece28617..22e57a97 100644
--- a/royalnet/engineer/exc.py
+++ b/royalnet/engineer/exc.py
@@ -47,3 +47,15 @@ class NotSupportedError(BulletException, NotImplementedError):
     """
     The requested property isn't available on the current frontend.
     """
+
+
+__all__ = (
+    "EngineerException",
+    "WrenchException",
+    "DeliberateException",
+    "TeleporterError",
+    "InTeleporterError",
+    "OutTeleporterError",
+    "BulletException",
+    "NotSupportedError",
+)
diff --git a/royalnet/engineer/teleporter.py b/royalnet/engineer/teleporter.py
index 68ce2eba..77eb57fb 100644
--- a/royalnet/engineer/teleporter.py
+++ b/royalnet/engineer/teleporter.py
@@ -188,7 +188,5 @@ def teleporter(__config__: t.Type[pydantic.BaseConfig] = TeleporterConfig,
 
 __all__ = (
     "TeleporterConfig",
-    "parameter_to_field",
-    "signature_to_model",
     "teleporter",
 )
diff --git a/royalnet/engineer/wrench.py b/royalnet/engineer/wrench.py
index b018e321..102594fb 100644
--- a/royalnet/engineer/wrench.py
+++ b/royalnet/engineer/wrench.py
@@ -303,4 +303,5 @@ __all__ = (
     "RegexMatch",
     "RegexReplace",
     "Lambda",
+    "Check",
 )