Add type() in error msg (#24723)

2025-09-12 12:59:07 +00:00 · 2024-07-26 16:48:45 -07:00
parent 9be6b5a20f
commit 0535d72927
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
@@ -230,7 +230,7 @@ class MessagesPlaceholder(BaseMessagePromptTemplate):
        if not isinstance(value, list):
            raise ValueError(
                f"variable {self.variable_name} should be a list of base messages, "
-                f"got {value}"
+                f"got {value} of type {type(value)}"
            )
        value = convert_to_messages(value)
        if self.n_messages: