We’ve rolled out a batch of new features across both LangGraph.js and LangGraph for Python — giving you faster development cycles, more efficient executions, and greater control over your agentic workflows.

Workflow Engine Improvements (Python & JS)

• Node Caching
  Cache the results of individual nodes to skip redundant computation and speed up runs — especially useful during iterative development.
  Python docs | JS docs

• Deferred Nodes
  Delay execution until all upstream paths complete — perfect for map-reduce, consensus, and collaborative agent workflows.
  Python docs | JS docs

Prebuilt ReAct Agent Upgrades

• Pre/Post Model Hooks
  Add custom logic before or after model calls. Great for controlling context bloat (pre) and inserting guardrails or human-in-the-loop checks (post).
  Python docs | JS docs

• Built-in Provider Tools
  Use web search, RemoteMCP, and more out of the box by simply adding a tool spec dict to your ReAct agent.

LangGraph.js Specific Enhancements

• Resumable Streams
  Streams now resume automatically after reloads or connection drops with reconnectOnMount.
  JS docs

• Dev Experience Improvements

  • .stream() is now fully type-safe.

  • .addNode({ ... }) and .addSequence({ ... }) make building workflows cleaner.

  • .invoke() and "values" stream modes now return interrupts directly.