langgraph 0.2.7

Summary of Changes

• Added support for shared state across graph nodes with SharedValue class
• Introduced storage system for persisting shared values
• Enhanced managed values system with writable values support
• Added ability to pass a store to StateGraph.compile() for persistent shared state

Detailed Changes

langgraph.constants.CONFIG_KEY_STORE

• Added new constant CONFIG_KEY_STORE = "__pregel_store" for configuring storage backend

langgraph.graph.state.StateGraph

• Added optional store parameter to compile() method to support shared state persistence
• Fixed state management to properly handle writable managed values

langgraph.managed.base.WritableManagedValue

• New abstract class that extends ManagedValue to support updating values
• Adds update() and aupdate() methods for synchronous and asynchronous updates

langgraph.managed.base.is_readonly_managed_value, langgraph.managed.base.is_writable_managed_value

• New utility functions to check if a managed value is read-only or writable

langgraph.managed.base.ChannelKeyPlaceholder, langgraph.managed.base.ChannelTypePlaceholder

• New placeholder objects for dynamically inserting channel key and type information

langgraph.managed.shared_value.SharedValue

• New implementation of WritableManagedValue for managing shared state
• Provides a way to share state across different graph nodes
• Supports scoped storage based on configuration
• Uses underlying storage engine if available

langgraph.pregel.Pregel

• Added new store attribute to configure persistent storage for shared values
• Enhanced logic to handle shared values in task processing

langgraph.store.base.BaseStore

• Abstract base class for storage engines
• Defines interfaces for listing and updating stored values
• Provides both synchronous and asynchronous methods

langgraph.store.memory.MemoryStore

• Simple in-memory implementation of BaseStore
• Stores values in a dictionary for easy access

langgraph.store.batch.AsyncBatchedStore

• Implementation that batches async operations for better performance
• Wraps another store and optimizes its operation pattern