Log tool name on transform validation error (#1238)

src/fastmcp/tools/tool_transform.py

@@ -445,7 +445,7 @@ class TransformedTool(Tool):
         if unknown_args:
             raise ValueError(
                 f"Unknown arguments in transform_args: {', '.join(sorted(unknown_args))}. "
-                f"Parent tool has: {', '.join(sorted(parent_params))}"
+                f"Parent tool `{tool.name}` has: {', '.join(sorted(parent_params))}"
             )
 
         # Always create the forwarding transform

tests/tools/test_tool_transform.py

@@ -404,11 +404,13 @@ def test_transform_args_validation_unknown_arg(add_tool):
     """Test that transform_args with unknown arguments raises ValueError."""
     with pytest.raises(
         ValueError, match="Unknown arguments in transform_args: unknown_param"
-    ):
+    ) as exc_info:
         Tool.from_tool(
             add_tool, transform_args={"unknown_param": ArgTransform(name="new_name")}
         )
 
+    assert "`add`" in str(exc_info.value)
+
 
 def test_transform_args_creates_duplicate_names(add_tool):
     """Test that transform_args creating duplicate parameter names raises ValueError."""