README

libs/agno/agno/models/anthropic/claude.py

@@ -172,7 +172,7 @@ def format_messages(self, messages: List[Message]) -> Tuple[List[Dict[str, str]]
         for idx, message in enumerate(messages):
             content = message.content or ""
             if message.role == "system" or (message.role != "user" and idx in [0, 1]):
-                if content:
+                if content is not None:
                     system_messages.append(content)  # type: ignore
                 continue
             elif message.role == "user":

libs/agno/agno/models/openai/chat.py

@@ -263,7 +263,7 @@ def format_message(self, message: Message) -> Dict[str, Any]:
                 logger.warning("Video input is currently unsupported.")
 
         # OpenAI expects the tool_calls to be None if empty, not an empty list
-        if message.tool_calls == []:
+        if message.tool_calls is not None and len(message.tool_calls) == 0:
             message.tool_calls = None
 
         return message.to_dict()