diff --git a/resources.capnp b/resources.capnp
index cb6e9e1..2305cd3 100644
--- a/resources.capnp
+++ b/resources.capnp
@@ -18,15 +18,19 @@ interface Resources {
     list @1 () -> ( resources :List(Resource) );
     # Returns all resources that the user can currently disclose.
 
-    getByName @2 ( name :Text ) -> ( resource :Resource , dummy :UInt8 );
+    getByName @2 ( name :Text ) -> Fallible(Resource, GetError);
     # Returns a NULL capability if the resource doesn't exist or a user doesn't have read permission for that resource.
 
-    getByUrn @3 ( urn :Text ) -> ( resource :Resource );
+    getByUrn @3 ( urn :Text ) -> Fallible(Resource, GetError);
     # Returns a NULL capability if the resource doesn't exist or a user doesn't have read permission for that resource.
    
-    getByUrl @4 ( url :Text ) -> ( resource :Resource );
+    getByUrl @4 ( url :Text ) -> Fallible(Resource, GetError);
     # Returns a NULL capability if the resource doesn't exist or a user doesn't have read permission for that resource.
 
+    struct GetError {
+        notFound @0 :Void;
+    }
+
     acceptToken @5 ( token :SturdyRef, project :Project ) -> Fallible(Claim, AcceptTokenError);
 
     acceptTokenSubstituteUser @7 ( token :SturdyRef, project :Project )