📰 LangChain Blog

A practical checklist for agent evaluation: error analysis, dataset construction, grader design, offline & online evals, and production readiness.

Discover how Kensho, S&P Global’s AI innovation engine, leveraged LangGraph to create its Grounding framework–a unified agentic access layer solving fragmented

 TLDR: The best agent evals directly measure an agent behavior we care about. Here's how we source data, create metrics, and run well-scoped, targeted experime

Agent harnesses are what help build an agent, they connect an LLM to its environment and let it do things. When you’re building an agent, it’s likely you’ll wan

Fleet now supports shareable skills, so you equip agents across your team with knowledge for specialized tasks.

Moda uses a multi-agent system built on Deep Agents and traced through LangSmith to let non-designers create and iterate on professional-grade visuals.

If you're attending Google Cloud Next 2026 in Las Vegas this year and working on agent development, here's what we have planned. Visit Us at Booth #5006 We'll b

LangSmith Fleet introduces two types of agent authorization: Assistants, which use the end user's own credentials, and Claws, which use a fixed set of credentia

Agent Builder is now Fleet: a central place for all of your teams to build, use, and manage agents across the enterprise.

Debugging agents is different from debugging anything else you've built. Traces run hundreds of steps deep, prompts span thousands of lines, and when something

Spin up a sandbox in a single line of code with the LangSmith SDK. Now in Private Preview.

Built on Deep Agents and LangGraph, Open SWE provides the core architectural components for internal coding agents.

Comprehensive agent engineering platform combined with NVIDIA AI enables enterprises to build, deploy, and monitor production-grade AI agents at scale Press Rel

We’re excited to introduce the deploy cli, a new set of commands within the langgraph-cli package that makes it simple to deploy and manage agents directly from

TL;DR: We've added a tool to the Deep Agents SDK (Python) and CLI that allows models to compress their own context windows at opportune times. Motivation Contex

By Vivek Trivedy TLDR: Agent = Model + Harness. Harness engineering is how we build systems around models to turn them into work engines. The model contains the

EPD (Engineering, Product, and Design) at software company is about creating good software. Separate roles exist, but the end goal is functional software that s

Learn how we built a GTM agent that increased lead conversion by 250% while saving each sales rep 40 hours per month

By Robert Xu Recently at LangChain we’ve been building skills to help coding agents like Codex, Claude Code, and Deep Agents CLI work with our ecosystem: namely

We’re releasing a CLI along with our first set of skills to give AI coding agents expertise in the LangSmith ecosystem. This includes adding tracing to agents,

We’re releasing our first set of skills to give AI coding agents expertise in the open source LangChain ecosystem. This includes building agents with LangChain

February gave us only twenty-eight days, but we made them count. From new Agent Builder capabilities to production monitoring insights, here's your monthly roun

You can't monitor agents like traditional software. Inputs are infinite, behavior is non-deterministic, and quality lives in the conversations themselves. This