diff --git a/src/ui.toit b/src/ui.toit
index 9d5b1fa..66c3c2a 100644
--- a/src/ui.toit
+++ b/src/ui.toit
@@ -732,6 +732,9 @@ class JsonPrinter extends HumanPrinterBase:
   needs-structured --kind/int -> bool:
     return kind == Ui.RESULT
 
+  wants-human --kind/int -> bool:
+    return kind != Ui.RESULT
+
   print_ str/string:
     print-on-stderr_ str
 
diff --git a/tests/ui-test.toit b/tests/ui-test.toit
index 6e1ca06..d9f94ef 100644
--- a/tests/ui-test.toit
+++ b/tests/ui-test.toit
@@ -370,3 +370,10 @@ test-json:
   ui.emit --error "some error"
   expect-equals "Error: some error\n" printer.stderr
   printer.reset
+
+  expect ui.wants-structured  // By default the kind is "Ui.RESULT".
+  expect (ui.wants-structured --kind=Ui.RESULT)
+  expect-not (ui.wants-structured --kind=Ui.INFO)
+  expect-not ui.wants-human  // By default the kind is "Ui.RESULT".
+  expect-not (ui.wants-human --kind=Ui.RESULT)
+  expect (ui.wants-human --kind=Ui.INFO)