0.2.37

langgraph 0.2.37

Summary of Changes

• Added new RemainingSteps managed value to get the number of remaining steps in a loop
• Improved managed values architecture with the introduction of LoopProtocol interface
• Enhanced Chat Agent Executor with better termination conditions using remaining steps
• Improved checkpointing in nested loops with proper parent configuration propagation

Detailed Changes

langgraph.managed.is_last_step.RemainingSteps

• Added new RemainingSteps managed value that returns the number of remaining steps in a loop execution
• Exposed through langgraph.managed module exports for easy access
• Can be used alongside IsLastStep for better loop control

langgraph.types.LoopProtocol

• Added new protocol class that provides context for loop execution
• Contains fields for config, store, stream, step, and stop information
• Makes managed values and channels more aware of loop execution context
• Simplified accessing step and recursion information across the codebase

langgraph.managed.base.ManagedValue

• Refactored to use LoopProtocol instead of raw RunnableConfig
• Changed __call__ signature to no longer require a step parameter
• Simplified managed value implementation by accessing loop context directly

langgraph.prebuilt.chat_agent_executor

• Enhanced agent executor with support for both IsLastStep and RemainingSteps
• Improved termination logic to handle different conditions:
  • Last step with tool calls
  • Low remaining steps with direct-return tools
  • Very low remaining steps with any tool calls
• Provides more nuanced control over when to stop agent execution

langgraph.pregel.loop.PregelLoop

• Updated to extend LoopProtocol for consistent interface
• Improved checkpoint metadata handling with step and parent information
• Better management of checkpoint configuration in nested loops

langgraph.utils.config.patch_checkpoint_map

• Enhanced to properly handle None configs
• Improved proper config propagation through nested graph invocations