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Validate message content to prevent silent LLM failures #26

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Validate message content to prevent silent LLM failures #26

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9 changes: 8 additions & 1 deletion agent/core/conversation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,19 +37,26 @@ def __init__(self, max_messages: int = 200, max_chars: int = 100000):
self.max_chars = max_chars

def add_system(self, content: str):
# Replace any existing system message
if content is None or (isinstance(content, str) and not content.strip()):
raise ValueError("Message content cannot be empty or None")
self.messages = [m for m in self.messages if m.role != "system"]
self.messages.insert(0, Message(role="system", content=content))

def add_user(self, content: str):
if content is None or (isinstance(content, str) and not content.strip()):
raise ValueError("Message content cannot be empty or None")
self.messages.append(Message(role="user", content=content))

def add_assistant(self, content: str, tool_calls: Optional[list] = None):
if content is None or (isinstance(content, str) and not content.strip()):
raise ValueError("Message content cannot be empty or None")
self.messages.append(
Message(role="assistant", content=content, tool_calls=tool_calls)
)

def add_tool_result(self, tool_call_id: str, name: str, content: str):
if content is None or (isinstance(content, str) and not content.strip()):
raise ValueError("Message content cannot be empty or None")
self.messages.append(
Message(role="tool", content=content, tool_call_id=tool_call_id, name=name)
)
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