[fix]: MessagePlaceholder input variable

2 weeks ago · cc3d89eba1
parent 3003363605
commit cc3d89eba1
1 changed files with 1 additions and 1 deletions
--- a/libs/core/langchain_core/prompts/chat.py
+++ b/libs/core/langchain_core/prompts/chat.py
@ -206,7 +206,7 @@ class MessagesPlaceholder(BaseMessagePromptTemplate):
        Returns:
            List of input variable names.
        """
-        return [self.variable_name] if not self.optional else []
+        return [self.variable_name]

    def pretty_repr(self, html: bool = False) -> str:
        var = "{" + self.variable_name + "}"