0.3.22

langgraph 0.3.22

Summary of Changes

• Improved error display by removing internal frames from tracebacks, making it easier to identify the actual source of errors (#4054)
• Added a copy() method to all channel classes for more efficient state copying, improving performance (#4106)
• Improved thread safety with new LazyAtomicCounter implementation (#4101)
• Enhanced support for Python 3.12 with optional eager task execution (#4055)
• Fixed type annotation for destinations parameter in StateGraph.add_node() (#4053)
• Refactored checkpoint handling for better consistency and performance (#4103, #4105)
• Improved handling of resume values in PregelScratchpad (#4098)
• Refactored StateGraph edge handling for better consistency (#4064)

Detailed Changes

langgraph.pregel.runner.PregelRunner

• Improved error tracebacks by removing internal frames from stack traces, making it easier to identify the actual source of errors (#4054)
• The library now filters out internal frames from langgraph, making error messages cleaner and more useful

langgraph.channels.base.BaseChannel and all channel implementations

• Added a new copy() method to all channel classes for more efficient state copying (#4106)
• Improved handling of checkpoints with consistent usage of MISSING constant instead of None (#4103)
• Updated method signatures to remove Optional types where appropriate
• Enhanced checkpoint methods for better consistency across channel types (#4105)

langgraph.pregel.algo.LazyAtomicCounter

• Added a new thread-safe counter implementation that lazily initializes only when needed (#4101)
• Used for various counters in PregelScratchpad to improve thread safety

langgraph.pregel.algo.local_read

• Refactored to use the new channel copy() method instead of creating checkpoints, significantly improving performance (#4106)
• Simplified interface by removing unnecessary parameters

langgraph.utils.future.run_coroutine_threadsafe

• Added support for "lazy" task execution control (#4055)
• Added support for eager tasks when running on Python 3.12
• Improved detection of when the current thread is already using the target event loop

langgraph.graph.state.StateGraph

• Fixed type annotation for destinations parameter in add_node() to correctly support tuples with multiple strings (#4053)
• Refactored edge handling for more consistent behavior (#4064)
• Changed some list types to tuples for immutability
• Added a constant for branch channel formatting

langgraph.types.PregelScratchpad

• Made the dataclass immutable for better safety (#4098)
• Improved handling of resume values with better null value management

langgraph.pregel.checkpoint.create_checkpoint

• Moved checkpoint creation to its own module for better organization (#4105)
• Improved handling of MISSING values in checkpoint creation