LangChain Blog

Polly is generally available everywhere you work in LangSmith

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

3 min read

Featured

The Anatomy of an Agent Harness

9 min read

How we built LangChain’s GTM Agent

10 min read

Evaluating Skills

7 min read

LangSmith CLI & Skills

2 min read

Introducing LangSmith Sandboxes: Secure Code Execution for Agents

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

3 min read

Open SWE: An Open-Source Framework for Internal Coding Agents

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

7 min read

LangChain Announces Enterprise Agentic AI Platform Built with NVIDIA

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

5 min read

Introducing deploy cli

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

1 min read

Autonomous context compression

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

4 min read

The Anatomy of an Agent Harness

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

9 min read

How Coding Agents Are Reshaping Engineering, Product and Design

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

Harrison's In the Loop Series 8 min read

How we built LangChain’s GTM Agent

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

10 min read

Evaluating Skills

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

7 min read

LangSmith CLI & Skills

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

2 min read

LangChain Skills

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

2 min read

February 2026: LangChain Newsletter

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

4 min read