LangChain Changelog

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September 2025

Composite Evaluators in LangSmith

If you’re running multiple evaluators to measure different aspects of your application, it can be difficult to see the overall picture. Composite Evaluators...

September 23, 2025

Middleware in LangChain 1.0 alpha

Middleware in LangChain 1.0 gives you fine-grained control around the core agent loop of models + tools. It includes: Read the blog about middleware and try...

September 16, 2025

Create org-scoped API keys with granular permissions

You can now create org-scoped service keys and optionally, assign roles for created keys. These updates give you more control, allowing you to: Learn more...

September 10, 2025

August 2025

Revision queueing in LangSmith Deployment

Keep your deployments smooth and predictable. With Revision Queueing , any new revisions are automatically lined up and processed only after the current one...

August 27, 2025

LangSmith Self-Hosted

LangSmith Self-Hosted v0.11

This release brings customizable LangGraph Platform deployments, streamlined evaluation via Align Evals, running evals directly from Studio, and operational...

August 18, 2025

Trace Mode in LangSmith Studio

Debugging and improving agents just got a lot smoother. With Trace Mode , you can now view your LangSmith traces directly in Studio —no more jumping between...

August 15, 2025

Dynamic tool calling in LangGraph agents

Agents don’t always need the same tools at every step. With dynamic tool calling , you can now control which tools are available at different points in a...

July 2025

Connect traces in LangSmith to agent deployment server logs

We’ve made agentic observability even easier — you can now connect traces in LangSmith to server logs within LangSmith Deployment. When viewing a trace...

Introducing Align Evals: Streamlining LLM Application Evaluation

Evaluations are a key technique for improving your application — whether you’re working on a single prompt or a complex agent. Iterating on evaluators has...

Keep external systems in sync with scheduled exports

You can now schedule automatic exports of your LangSmith traces, without needing to set up your own infrastructure. Whether you're syncing to a data...

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