LangChain Changelog

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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

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...

View agent deployment metrics in LangSmith

You can now monitor your agent deployments directly from the LangSmith UI. View your deployment’s CPU & memory usage, API request latency, pending/active run...

Set expiration dates on LangSmith API keys!

You can now set expiration dates on LangSmith API keys! Adding expiration helps you: Learn how to set and manage API key expirations in our documentation.

Create custom views when viewing evaluation results

You can now create custom views to highlight important information when viewing evaluation results in LangSmith: Docs:...

June 2025

Use built-in tools in LangSmith's Playground!

You can now call built-in tools from OpenAI and Anthropic directly from within the LangSmith Playground. Pre-configured tools, such as web search and MCP,...

Track costs across multi-modal inputs and token-caching

Cost tracking is especially important for agentic applications because resource usage is determined dynamically by the agent itself. Our new cost-tracking...

May 2025

Integrate LangSmith prompts with your SDLC

You can already test, version, and collaborate on prompts in LangSmith. Now, you can automatically sync those prompts to GitHub, external databases, or CI/CD...

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