langgraph 0.2.6

Summary of Changes

• Added structured graph interruption mechanism with timing information (before/during/after) in PR #1354
• Added a new NodeInterrupt exception for nodes to signal interruption during execution
• Improved handling of interrupts with full context of when they occurred
• Added task ID tracking in the configuration system
• Fixed several bugs related to checkpoint and interrupt handling

Detailed Changes

langgraph.constants.Interrupt

• Added new Interrupt dataclass to represent structured interruption events with a when field ("before", "during", "after") and an optional value
• Added CONFIG_KEY_TASK_ID constant for tracking task identifiers

langgraph.errors.GraphInterrupt

• Enhanced to store a list of Interrupt objects, providing detailed information about interruption events
• Improved distinction between regular errors and intentional interrupts during execution

langgraph.errors.NodeInterrupt

• Added new exception class allowing nodes to signal interruption during execution
• Simplifies raising "during" interrupts from within node logic

langgraph.pregel.algo.should_interrupt

• Changed return type from boolean to list of executable tasks that should be interrupted
• Provides more precise control over which tasks get interrupted while maintaining the same criteria

langgraph.pregel.PregelTask

• Added interrupts field to track interruption events associated with a task
• Enhances visibility of interruption state for debugging and flow control purposes

langgraph.pregel execution

• Fixed issues with interrupt propagation between nested graphs
• Improved checkpoint handling during interrupts
• Added proper copying of channel versions to avoid unintended mutations
• Fixed step numbering in update operations
• Made execution more robust by properly tracking all futures