[Release] langchain-ai/langchain langchain==1.3.3: langchain==1.3.3

LangChain version 1.3.3 introduces improvements to subagent run projection onto typed channels and enhances the HumanInTheLoopMiddleware with interrupt_mode and conditional predicate support. The release includes a dependency bump for langgraph to 1.2.4 and loosens the langgraph version constraint for better compatibility. These changes improve agent orchestration capabilities and middleware flexibility for human-in-the-loop workflows.

Key Points

• •Upgraded langgraph dependency to version 1.2.4 for improved compatibility and features
• •Loosened langgraph dependency range to allow broader version compatibility
• •Implemented project subagent runs onto typed run.subagents channel for better data structure handling
• •Added interrupt_mode parameter to HumanInTheLoopMiddleware for flexible interruption control
• •Added when predicate to HumanInTheLoopMiddleware for conditional interrupt triggering
• •Enhanced human-in-the-loop workflows with more granular control over agent execution
• •Improved subagent orchestration with typed channel projections

Workflow Diagram

Concepts