diff --git a/pkl/crossplane.contrib/CompositionResponse.pkl b/pkl/crossplane.contrib/CompositionResponse.pkl
index 6649f9a..b47f21c 100644
--- a/pkl/crossplane.contrib/CompositionResponse.pkl
+++ b/pkl/crossplane.contrib/CompositionResponse.pkl
@@ -41,7 +41,7 @@ class ResponseMeta {
 /// A Result of running a Function.
 class Result {
   /// Severity of this result.
-  severity: Severity
+  severity: Severity = SEVERITY_UNSPECIFIED
 
   /// Human-readable details about the result.
   message: String
diff --git a/pkl/crossplane.contrib/Resource.pkl b/pkl/crossplane.contrib/Resource.pkl
index c339cae..b0fdb43 100644
--- a/pkl/crossplane.contrib/Resource.pkl
+++ b/pkl/crossplane.contrib/Resource.pkl
@@ -34,7 +34,7 @@ typealias Ready = Int(isBetween(0,2))
 ///
 ///   - A Function should not set this field in a RunFunctionResponse to indicate
 ///     that the desired composite resource is ready. This will be ignored.
-ready: Ready?
+ready: Ready? = READY_UNSPECIFIED
 
 /// The resource's connection details.
 ///