Bug Fixes

• Fixed an error that occurred when ECS runtime monitoring is enabled with GuardDuty#501 by @fsatsuki
• Fixed validation errors for HumanMessage content when uses sql agent tool. #498 by @drskur
• Fixed issue where chat history was not being remembered in Published (Bot) API #500 by @Yukinobu-Mine
• Resolve unstructured / NLTK bug issues. #499, #502 by @fsatsuki, @Yukinobu-Mine