diff --git a/src/taskgraph/transforms/run/__init__.py b/src/taskgraph/transforms/run/__init__.py
index c3a151c37..29406e7cd 100644
--- a/src/taskgraph/transforms/run/__init__.py
+++ b/src/taskgraph/transforms/run/__init__.py
@@ -153,7 +153,7 @@
             Extra: object,
         },
         Required("worker-type"): task_description_schema["worker-type"],
-        Required(
+        Optional(
             "worker",
             description=dedent(
                 """
diff --git a/src/taskgraph/transforms/run/toolchain.py b/src/taskgraph/transforms/run/toolchain.py
index 99b57adfc..669bcd812 100644
--- a/src/taskgraph/transforms/run/toolchain.py
+++ b/src/taskgraph/transforms/run/toolchain.py
@@ -97,7 +97,7 @@
                 """
             ),
         ): {str: object},
-        Optional(
+        Required(
             "workdir",
             description=dedent(
                 """