diff --git a/lib/mcp/resource.rb b/lib/mcp/resource.rb
index 5b985a93..6c92ce00 100644
--- a/lib/mcp/resource.rb
+++ b/lib/mcp/resource.rb
@@ -18,7 +18,7 @@ def to_h
         name: @name,
         description: @description,
         mimeType: @mime_type,
-      }
+      }.compact
     end
   end
 end