diff --git a/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl b/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl
index 1caa8da23..d992cdc07 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_api_schema.erl
@@ -68,6 +68,7 @@ fields("rule_events") ->
 fields("rule_test") ->
     [ {"context", sc(hoconsc:union([ ref("ctx_pub")
                                    , ref("ctx_sub")
+                                   , ref("ctx_unsub")
                                    , ref("ctx_delivered")
                                    , ref("ctx_acked")
                                    , ref("ctx_dropped")
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
index 205f85488..cbfda16db 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine_api.erl
@@ -257,11 +257,16 @@ format_output(Outputs) ->
     [do_format_output(Out) || Out <- Outputs].
 
 do_format_output(#{mod := Mod, func := Func, args := Args}) ->
-    #{function => list_to_binary(lists:concat([Mod,":",Func])),
+    #{function => printable_function_name(Mod, Func),
       args => maps:remove(preprocessed_tmpl, Args)};
 do_format_output(BridgeChannelId) when is_binary(BridgeChannelId) ->
     BridgeChannelId.
 
+printable_function_name(emqx_rule_outputs, Func) ->
+    Func;
+printable_function_name(Mod, Func) ->
+    list_to_binary(lists:concat([Mod,":",Func])).
+
 get_rule_metrics(Id) ->
     Format = fun (Node, #{matched := Matched,
                           rate := Current,
diff --git a/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl b/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
index ba516bfa7..5d72d5a6d 100644
--- a/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
+++ b/apps/emqx_rule_engine/src/emqx_rule_engine_schema.erl
@@ -182,6 +182,7 @@ rule_name() ->
     {"name", sc(binary(),
         #{ desc => "The name of the rule"
          , default => ""
+         , nullable => false
          , example => "foo"
          })}.