# sympy__sympy-21614
# Loki Mode Multi-Agent Patch
# Attempts: 1

Based on the architect's analysis, I need to generate a patch for the `Derivative` class in `sympy/core/function.py`. The fix is to add a `kind` property that returns the kind of the expression being differentiated.

Let me generate the patch based on the analysis:

```
--- a/sympy/core/function.py
+++ b/sympy/core/function.py
@@ -1286,6 +1286,10 @@ class Derivative(Expr):
     is_Derivative = True
 
     @property
+    def kind(self):
+        return self.expr.kind
+
+    @property
     def _diff_wrt(self):
         """An expression may be differentiated wrt a sub-expression
         if it is a simple symbol or if it has the _diff_wrt attribute.
```