langgraph 0.1.6

Summary of Changes

• Added support for RemoveMessage type from langchain-core, allowing deletion of messages by ID in message graphs #651, #958
• Added error handling for tools in ToolNode with a new parameter handle_tool_errors (defaults to True) #910
• Updated dependency on langchain-core to 0.2.11 #909
• Improved documentation for create_react_agent with detailed diagrams and explanations #899
• Fixed example variable name in create_react_agent documentation #896

Detailed Changes

langgraph.graph.message.add_messages

• Added support for RemoveMessage type from langchain-core, allowing the ability to delete messages by ID
• Initially implemented by removing messages directly at the found index (#651)
• Later improved to collect IDs to remove in a set and filter at the end, preventing issues with index shifts (#958)
• Added validation to raise an error when attempting to delete a message that doesn't exist

langgraph.prebuilt.tool_node

• Added a new parameter handle_tool_errors (defaults to True) to control error handling behavior
• Added try/except blocks around tool invocation in both sync and async implementations
• When errors occur during tool execution and handle_tool_errors is True, returns a friendly error message instead of raising an exception
• This makes agents more resilient to tool execution failures, allowing the conversation to continue