LangChain Changelog

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March 2025

LangGraph BigTool for providing agents access to a large number of tools

langgraph-bigtool is a Python library for creating LangGraph agents that can access large numbers of tools. Key features include: • Scalable access to tools:...

LangGraph Swarm for building multi-agent systems

We now have a lightweight library for building swarm-style multi-agent systems with LangGraph. Key features include: The library is available via pip install...

LangGraph 0.3: Pre-built agents

LangGraph has always been about giving full control over your AI agents—no hidden prompts, no enforced architectures. But we also know that getting started...

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: Why use MCP...

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

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