LangChain Changelog

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March 2025

Claude 3.7 Support in LangChain Python & JavaScript

Claude 3.7 support has been released for both JavaScript (via @langchain/anthropic package) and Python versions of LangChain. This lets LangChain users to...

MCP Adapters for LangChain and LangGraph

The LangChain MCP Adapters is a package that makes it easy to use Anthropic Model Context Protocol (MCP) tools with LangChain & LangGraph. It: This adapter...

February 2025

New ingest-backend service for faster LangSmith performance

We've launched a new dedicated Go service called 'ingest-backend' to handle all run and feedback ingestion in LangSmith. This architectural improvement...

February 26, 2025

LangGraph Supervisor: A Library for Hierarchical Multi-Agent Systems

We've released LangGraph Supervisor, a new lightweight Python library that simplifies building hierarchical multi-agent systems with LangGraph. Key features...

February 26, 2025

⚖️ Start Evaluating LLMs with OpenEvals

Evals are a vital part of bringing LLM apps to production. To make it easier to get started, we launched a new OSS repo: OpenEvals ! OpenEvals contains...

February 26, 2025

📊 Group LangSmith experiments by metadata to get valuable insights

We’ve added a new view that allows you to group experiment results by metadata. Compare the performance of your evaluations across different segments (eg....

February 25, 2025

useStream for integrating LangGraph for your React app

You can now integrate LangGraph into your React application with a single hook. Thread and state management, messages streaming and branching built-in. See...

February 21, 2025

Saved workspace secrets in LangSmith Playground

You can now use secrets saved in your workspace in the LangSmith Playground. Teams can use the same centralized keys used for evaluators to also experiment...

February 20, 2025

LangMem SDK for long-term agent memory

The LangMem SDK is a lightweight Python library that helps your agents learn and improve through long-term memory. It provides tooling to extract information...

February 20, 2025

LangSmith LangGraph

LangSmith dataset integration in LangGraph Studio

You can now send node inputs/outputs from LangGraph Studio directly to LangSmith datasets for testing! This means you can open LLM runs from LangGraph Studio...

February 8, 2025

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