diff --git a/lib/actor/actor.go b/lib/actor/actor.go
index 9c4b3d8..85b9f9d 100644
--- a/lib/actor/actor.go
+++ b/lib/actor/actor.go
@@ -22,6 +22,7 @@ var (
 	TypeSession            Type = "session"
 	TypeExternalCloudAuth  Type = "external_cloud_auth" // non-Mojo system
 	TypeExternalUser       Type = "external_user"       // non-Mojo user
+	TypeExternalLanggraph  Type = "external_langgraph"
 	TypeExternalRevenuecat Type = "external_revenuecat"
 )
 
@@ -107,6 +108,15 @@ func NewExternalUser(typ, id, reference string) Actor {
 	}
 }
 
+func NewExternalLanggraph(userID ksuid.ID) Actor {
+	return Actor{
+		Type: TypeExternalLanggraph,
+		Params: map[string]any{
+			"user_id": userID.String(),
+		},
+	}
+}
+
 func NewExternalRevenuecat() Actor {
 	return Actor{
 		Type:   TypeExternalRevenuecat,