diff --git a/src/azure-cli-core/azure/cli/core/commands/events.py b/src/azure-cli-core/azure/cli/core/commands/events.py
index bfb1a760e02..454d564843b 100644
--- a/src/azure-cli-core/azure/cli/core/commands/events.py
+++ b/src/azure-cli-core/azure/cli/core/commands/events.py
@@ -5,3 +5,7 @@
 
 EVENT_INVOKER_PRE_CMD_TBL_TRUNCATE = 'CommandInvoker.OnPreCommandTableTruncate'
 EVENT_INVOKER_ON_TAB_COMPLETION = 'CommandInvoker.OnTabCompletion'
+
+# special events used for Interactive and Alias extension communication
+EVENT_INTERACTIVE_PRE_COMPLETER_TEXT_PARSING = 'Interactive.PreCompleterTextParsing'
+EVENT_INTERACTIVE_POST_SUB_TREE_CREATE = 'Interactive.PostSubTreeCreate'