LangChain Changelog

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May 2025

Monthly usage charts for easy tracking in LangSmith

We’ve rolled out monthly usage charts for SaaS customers in LangSmith. You can now track all billable metrics (as defined in Metronome) in one place on the...

LangSmith now supports MCP

Every deployed agent on LangSmith now exposes its own MCP endpoint. Leverage your agents as tools in any client supporting streamable HTTP for MCP— no custom...

Agent Observability: Gain Insights into Tool Calls & Run Stats

We've launched new levels of visibility for agents to help you understand what your agent is doing! You can now get visibility into tool calls and run stats:...

Multimodal support in LangSmith

LangSmith now supports images, PDFs, and audio files across the playground, annotation queues, and datasets — making it easier than ever to build, test, and...

April 2025

Catch Production Failures Early with Alerts in LangSmith

Set up real‑time notifications on error rates, run latency & feedback scores to spot failures before your customers do. If you’re already sending production...

Run interactive evals with the LangSmith Playground

You can now create datasets inline and add examples to existing datasets without leaving the Playground. This update makes building a dataset to evaluate LLM...

March 2025

Run evaluators in the LangSmith UI

We've made evaluations even easier to set up! You can now define evaluators for datasets and tracing projects directly in the UI —no code required. After...

End-to-end native OpenTelemetry support for LangSmith SDK

Introducing End-to-End OpenTelemetry Support in LangSmith LangSmith now supports full end-to-end OpenTelemetry (OTel) for LangChain and LangGraph...

Trace with the OpenAI Agents SDK

You can now connect your OpenAI Agents to LangSmith with just 2 lines of code ! The OpenAI Agents SDK enables developers to build agentic applications...

Renaming an experiment in the LangSmith UI

You can now rename experiments in LangSmith, making it easier to keep your workspace organized. Whether you're running quick tests in the Playground or...

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