diff --git a/rainbowadn/instrument/instrumentation.py b/rainbowadn/instrument/instrumentation.py
index bb8be28..fe65171 100644
--- a/rainbowadn/instrument/instrumentation.py
+++ b/rainbowadn/instrument/instrumentation.py
@@ -13,8 +13,10 @@ class Instrumentation(Generic[IType]):
     _wrap: Callable
 
     def __init__(self, target, methodname: str):
-        assert isinstance(methodname, str)
-        assert callable(getattr(target, methodname))
+        if not isinstance(methodname, str):
+            raise TypeError('methodname must be str')
+        if not callable(getattr(target, methodname)):
+            raise TypeError('target.methodname must be callable')
         self.target = target
         self.methodname = methodname
 
@@ -22,11 +24,13 @@ class Instrumentation(Generic[IType]):
         raise NotImplementedError
 
     def __enter__(self: IType) -> IType:
-        assert isinstance(self, Instrumentation)
-        assert not hasattr(self, '_method')
-        assert not hasattr(self, '_wrap')
+        if not isinstance(self, Instrumentation):
+            raise TypeError
+        if hasattr(self, '_method') or hasattr(self, '_wrap'):
+            raise RuntimeError
         method = getattr(self.target, self.methodname)
-        assert callable(method)
+        if not callable(method):
+            raise TypeError
         self._method = method
 
         @functools.wraps(method)
@@ -56,11 +60,13 @@ class Instrumentation(Generic[IType]):
         self.deinstrument()
 
     def enter(self: IType, stack: ExitStack) -> IType:
-        assert isinstance(self, Instrumentation)
+        if not isinstance(self, Instrumentation):
+            raise TypeError
         return stack.enter_context(self)
     
     def enter_conditional(self: IType, stack: ExitStack) -> IType | None:
-        assert isinstance(self, Instrumentation)
+        if not isinstance(self, Instrumentation):
+            raise TypeError
         if hasattr(self.target, self.methodname):
             return self.enter(stack)
         else: