📝 docs(constants.py): add missing documentation for INPUT_KEY_INFO and OUTPUT_KEY_INFO variables

🐛 fix(memories.py): set info field for input_key and output_key fields to provide additional information to users

src/backend/langflow/template/frontend_node/constants.py

@@ -58,3 +58,7 @@ The base URL of the OpenAI API. Defaults to https://api.openai.com/v1.
 
 You can change this to use other APIs like JinaChat, LocalAI and Prem.
 """
+
+
+INPUT_KEY_INFO = """The variable to be used as Chat Input when more than one variable is available."""
+OUTPUT_KEY_INFO = """The variable to be used as Chat Output (e.g. answer in a ConversationalRetrievalChain)"""

src/backend/langflow/template/frontend_node/memories.py

@@ -2,6 +2,7 @@ from typing import Optional
 
 from langflow.template.field.base import TemplateField
 from langflow.template.frontend_node.base import FrontendNode
+from langflow.template.frontend_node.constants import INPUT_KEY_INFO, OUTPUT_KEY_INFO
 from langflow.template.template.base import Template
 from langchain.memory.chat_message_histories.postgres import DEFAULT_CONNECTION_STRING
 from langchain.memory.chat_message_histories.mongodb import (
@@ -70,11 +71,15 @@ class MemoryFrontendNode(FrontendNode):
             field.required = False
             field.show = True
             field.advanced = False
-        if field.name in ["input_key", "output_key"]:
+        if field.name in {"input_key", "output_key"}:
             field.required = False
             field.show = True
             field.advanced = False
             field.value = ""
+            field.info = (
+                INPUT_KEY_INFO if field.name == "input_key" else OUTPUT_KEY_INFO
+            )
+
         if field.name == "memory_key":
             field.value = "chat_history"
         if field.name == "chat_memory":