0.2.24

langgraph 0.2.24

Summary of Changes

• Introduced a new langgraph.types module containing important data types including Send and Interrupt which were moved from constants.py for better organization
• Added detection and prevention of multiple subgraphs being called inside the same node with a new MultipleSubgraphsError
• Simplified the managed values system by refactoring ManagedValueMapping to a simple type alias
• Improved configuration system with better key handling, using constants instead of string literals
• Optimized memory usage by applying sys.intern() to frequently used string constants

Detailed Changes

langgraph.types

• Created a new module containing important data types and classes
• Moved Send and Interrupt classes from constants.py to this module (they're still re-exported from constants for backward compatibility)
• Improved type definitions for Checkpointer, StreamMode, RetryPolicy, and other core types
• Better organized type definitions for improved code organization and readability

langgraph.errors.MultipleSubgraphsError

• Added a new exception type to detect and prevent multiple subgraphs from being called inside the same node
• Introduced _SEEN_CHECKPOINT_NS tracking mechanism to detect when this scenario occurs
• Improved error documentation for various error types to make troubleshooting easier

langgraph.managed.base.ManagedValueMapping

• Simplified from a custom class with complex behavior to a straightforward type alias (dict)
• Removed runtime placeholder functionality which was previously used for managing runtime values

langgraph.pregel.loop.PregelLoop

• Added subgraph detection to prevent problematic multiple subgraph execution
• Standardized configuration key usage across both synchronous and asynchronous implementations
• Improved error handling for better debuggability

langgraph.pregel.algo

• Simplified the local_write function by removing unnecessary parameters
• Enhanced documentation throughout the module for better clarity
• Added better validation for Send objects in Pregel tasks

langgraph.constants

• Most constants now use sys.intern() to optimize memory usage
• Added new constants like EMPTY_MAP, EMPTY_SEQ for reusable empty collections
• Reorganized RESERVED for better clarity with logical groupings

langgraph.utils.config

• Replaced string literals with constants for configuration keys
• Improved config merging and patching functionality
• Standardized config handling across the codebase