LangChain Changelog

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October 2025

No Code Agent Builder in LangSmith, now in private preview

We're expanding who can build agents beyond developers with LangSmith Agent Builder— a no-code agent-building experience now in private preview. Build real...

October 29, 2025

Discover patterns in production traces with the Insights Agent

Traces contain valuable signal about an agent's capabilities and how users engage with it. Insights Agent helps you find signal into your traces by analyzing...

October 23, 2025

Evaluate end-to-end agent interactions with Multi-turn Evals

Today, we're launching Multi-turn Evals to help you measure how your agent is performing across an entire end-to-end interaction. Multi-turn evals are online...

October 23, 2025

Improved dataset creation: faster and more flexible

Uploading data from an existing CSV/JSONL files is one of the easiest ways to get started with datasets and experiments. We’ve revamped the upload flow to...

October 17, 2025

JavaScript Code Evals for faster eval workflows

JavaScript Code Evals allow you to write custom Code Evals in JavaScript in addition to Python. This gives you the flexibility to choose the language that...

October 7, 2025

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

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

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

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...

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