langgraph 0.3.10

Summary of Changes

• Added a new SchemaCoercionMapper class to efficiently handle schema coercion with caching (#3806)
• Improved how Pydantic models are handled in state updates, respecting field set values (#3839)
• Enhanced PregelTask to better handle return values and results (#3839)
• Simplified channel writes by removing required channel validation (#3839)
• Added environment variable control for recursion limit via LANGGRAPH_DEFAULT_RECURSION_LIMIT (#3812, #3813)

Detailed Changes

langgraph.graph.schema_utils.SchemaCoercionMapper

• Added a new utility class for efficiently coercing data to schemas
• Implements caching using weakrefs to improve performance
• Supports both Pydantic v1 and v2 models
• Handles nested structures like lists, dicts, tuples and unions

langgraph.graph.state.StateGraph

• Updated state coercion to use the new SchemaCoercionMapper
• Improved handling of Pydantic models for state updates
• Simplified formatting and structure of conditional code

langgraph.pregel.write.ChannelWrite

• Removed the require_at_least_one_of parameter and validation logic
• Made channel write operations more permissive, simplifying usage

langgraph.types.PregelTask

• Updated result field to accept Any type instead of only dictionaries
• This allows for more flexible return values from tasks

langgraph.pregel.debug

• Enhanced map_debug_task_results to include RETURN values in results
• Refactored tasks_w_writes for better handling of task results
• Improved handling of return values in task output

Configuration

• Added support for configuring recursion limit via environment variable
• Set LANGGRAPH_DEFAULT_RECURSION_LIMIT to control recursion depth (default: 25)