langgraph 0.1.9

Summary of Changes

• Fix state graph interrupt handling to properly check all channels for updates #1004
• Add validation to check if nodes exist before updating state #1015
• Improve graph visualization to only create END nodes when needed #1022
• Enhance ToolNode to better handle tool errors and invalid tool names #1052
• Add state_modifier parameter to create_react_agent and deprecate messages_modifier #1023
• Improve background task management with new executor classes #1048
• Add equality comparison support to channel classes #1004
• Add comprehensive documentation to BaseCheckpointSaver #1057

Detailed Changes

langgraph.prebuilt.tool_node.ToolNode

• Improve error handling for invalid tool calls #1052
• Add descriptive error message when an invalid tool name is requested
• Pass the full tool call information to the tool rather than just the arguments
• Standardize error message formatting through templates

langgraph.prebuilt.chat_agent_executor.create_react_agent

• Add new state_modifier parameter that provides more control over LLM inputs #1023
• Deprecate messages_modifier parameter in favor of state_modifier
• Add support for custom state_schema to define graph state beyond the default AgentState
• Refactor preprocessing logic for better flexibility and type safety

langgraph.pregel

• Improve interrupt handling to check all channels for updates #1004
• Add new executor classes for better background task management #1048
• Add BackgroundExecutor and AsyncBackgroundExecutor classes for task management
• Improve cancellation and cleanup of background tasks
• Validate node existence in update_state to prevent errors #1015

langgraph.checkpoint.base.BaseCheckpointSaver

• Add comprehensive documentation to all methods #1057
• Clarify implementation requirements for custom checkpoint savers
• Improve error messages to use "checkpoint saver" instead of "checkpointer"

langgraph.graph.state.StateGraph

• Add support for custom input and output types
• Add retry policies for nodes
• Improve metadata handling for nodes
• Refactor schema handling for better flexibility

langgraph.graph.graph.Graph

• Improve graph visualization to only create END nodes when needed #1022
• Add hint about type hints for conditional edges to improve graph visualization #1035

langgraph.channels

• Add equality comparison support (__eq__ methods) to channel classes
• Affected channels: AnyValue, BinaryOperatorAggregate, Context, DynamicBarrierValue, EphemeralValue, LastValue, NamedBarrierValue, Topic

langgraph._api.deprecation

• Add new deprecated_parameter function for marking parameters as deprecated #1023