diff --git a/internal/artifactpolicy/policy.go b/internal/artifactpolicy/policy.go
index 306f9bc..07118a7 100644
--- a/internal/artifactpolicy/policy.go
+++ b/internal/artifactpolicy/policy.go
@@ -53,7 +53,6 @@ type Source struct {
 // ScriptoriumInputSourceDescriptor describes one validated Scriptorium input source.
 type ScriptoriumInputSourceDescriptor struct {
 	Source          Source
-	PreparedInput   *PreparedInputSourceDescriptor
 	PreviousSession *PreviousSessionSourceDescriptor
 }
 
@@ -170,8 +169,7 @@ func DescribeScriptoriumInputSource(source string) (ScriptoriumInputSourceDescri
 	}
 	if prepared, ok := DescribePreparedInputSource(trimmed); ok {
 		return ScriptoriumInputSourceDescriptor{
-			Source:        Source{ID: prepared.SourceID, Kind: SourceKindStableInput},
-			PreparedInput: &prepared,
+			Source: Source{ID: prepared.SourceID, Kind: SourceKindStableInput},
 		}, nil
 	}
 	if strings.HasPrefix(trimmed, "narratio.previous_session.artifact") {
@@ -196,13 +194,6 @@ func DescribeScriptoriumInputSource(source string) (ScriptoriumInputSourceDescri
 	return ScriptoriumInputSourceDescriptor{Source: classified}, nil
 }
 
-// IsStableInputSource reports whether source is a prepared stable input source
-// available only to Scriptorium input resolution.
-func IsStableInputSource(source string) bool {
-	_, ok := DescribePreparedInputSource(source)
-	return ok
-}
-
 var preparedInputSources = map[string]PreparedInputSourceDescriptor{
 	SourceInputPlayers: {
 		SourceID:     SourceInputPlayers,
diff --git a/internal/artifactpolicy/policy_test.go b/internal/artifactpolicy/policy_test.go
index 887b790..b5c9b37 100644
--- a/internal/artifactpolicy/policy_test.go
+++ b/internal/artifactpolicy/policy_test.go
@@ -233,14 +233,6 @@ func TestDescribePreparedInputSource(t *testing.T) {
 			if descriptor.SourceID != tt.source || descriptor.ManifestKind != tt.manifestKind || descriptor.Filename != tt.filename {
 				t.Fatalf("DescribePreparedInputSource(%q) = %#v", tt.source, descriptor)
 			}
-
-			scriptoriumDescriptor, err := DescribeScriptoriumInputSource(tt.source)
-			if err != nil {
-				t.Fatalf("DescribeScriptoriumInputSource(%q) error = %v", tt.source, err)
-			}
-			if scriptoriumDescriptor.PreparedInput == nil || *scriptoriumDescriptor.PreparedInput != descriptor {
-				t.Fatalf("prepared input descriptor = %#v, want %#v", scriptoriumDescriptor.PreparedInput, descriptor)
-			}
 		})
 	}