LangChain Changelog

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June 2024

🗺️ Variable mapping for online evaluator prompts

In LangSmith, you can now use any structured prompt from the LangChain Hub with customizable variables. You can personalize your inputs based on recent runs...

🛝 Enter the playground from scratch instead of from a trace or a prompt

The Playground is now its own tab in the sidebar of LangSmith. To create a new prompt , simply craft a prompt in the empty playground and click "Save As" to...

💬 Chat LangChain improvements

Users can now view and continue previous chats in Chat LangChain , our chatbot for LangChain Python docs and API reference. These improvements were made...

🧬 Build generative UI applications with LangChain in JavaScript/TypeScript and Python

Using streaming agent events and tool calls to pick pre-built components, you can now use generative UI to improve your chatbot with interactable components....

May 2024

💬 Manage private prompts without a handle

We’ve improved our SDK and LangSmith Prompts UI to make navigating prompts simpler. Now, only public prompts require a handle on creation. New accounts won’t...

🔧 Off-the-shelf online evaluator prompts to catch bad retrieval and hallucinations for RAG

LangSmith’s online evaluator (LLM-as-judge) automatically runs on production traces with a customizable prompt and automation rules. Our new off-the-shelf...

🔁 Repetitions to build confidence in your experiment results

You can now run multiple repetitions of your experiment in LangSmith. This helps smooth out noise from variability introduced by your application or from...

✂️ Dataset splits for evaluation and filtering/editing dataset examples

With dataset splits, it's easier to run evaluations on a subset of your data in LangSmith. You can tag examples with different split names , edit and add to...

📞 Multi-modal function calling in JavaScript

In our @langchain/google-genai or @langchain/google-vertexai packages, we’ve added function calling with structured output, which allows you to build more...

📝 Versioned docs and better structure for LangChain v0.2

We’ve updated our docs for LangChain v0.2 to be separated into: LangChain v0.2 docs walkthrough Check out the new docs in Python and JavaScript , then give...

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