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How we built Agent Builder’s memory system

How we built Agent Builder’s memory system

A key part of Agent Builder is its memory system. In this article we cover our rationale for prioritizing a memory system, technical details of how we built it, learnings from building the memory system, what the memory system enables, and discuss future work.

9 min read

Featured

LangSmith Agent Builder Now Generally Available

Now GA: LangSmith Agent Builder

agents 2 min read
Agent Engineering: A New Discipline

Agent Engineering: A New Discipline

5 min read
Doubling down on DeepAgents

Doubling down on DeepAgents

3 min read
LangChain and LangGraph Agent Frameworks Reach v1.0 Milestones

LangChain and LangGraph Agent Frameworks Reach v1.0 Milestones

7 min read
Agent Observability Powers Agent Evaluation

Agent Observability Powers Agent Evaluation

You can't build reliable agents without understanding how they reason, and you can't validate improvements without systematic evaluation.

13 min read
How to Use Memory in Agent Builder

How to Use Memory in Agent Builder

By Jacob Talbot Agent Builder gets better the more you use it because it remembers your feedback. Every correction you make, preference you share, and

4 min read
New in Agent Builder: all new agent chat, file uploads + tool registry

New in Agent Builder: all new agent chat, file uploads + tool registry

Today, we're expanding what you can do with LangSmith Agent Builder. It’s an big update built around a simple idea: working with

4 min read
monday Service + LangSmith: Building a Code-First Evaluation Strategy from Day 1

monday Service + LangSmith: Building a Code-First Evaluation Strategy from Day 1

Learn how monday Service developed an eval-driven development framework for their customer-facing service agents.

Case Studies 8 min read
Improving Deep Agents with harness engineering

Improving Deep Agents with harness engineering

TLDR: Our coding agent went from Top 30 to Top 5 on Terminal Bench 2.0. We only changed the harness. Here’s our approach

8 min read
On Agent Frameworks and Agent Observability

On Agent Frameworks and Agent Observability

Every time LLMs get better, the same question comes back: "Do you still need an agent framework?" It's a fair question.

Harrison's Hot Takes 4 min read
Tickets now available for Interrupt 2026

Join us for Interrupt: The Agent Conference

Interrupt - The Agent Conference by LangChain - is where builders come to learn what's actually working in production. This year, we'

1 min read
The two patterns by which agents connect sandboxes

The two patterns by which agents connect sandboxes

Thank you to Nuno Campos from Witan Labs, Tomas Beran and Mikayel Harutyunyan from E2B, Jonathan Wall from Runloop, and Ben Guo from Zo Computer

6 min read
LangSmith is Now Available in Google Cloud Marketplace

LangSmith is Now Available in Google Cloud Marketplace

Today, we're thrilled to announce that LangSmith, the agent engineering platform from LangChain, is available in Google Cloud Marketplace. Google Cloud customers can

4 min read
January 2026: LangChain Newsletter

January 2026: LangChain Newsletter

Read about the latest product updates, events, and content from the LangChain team

4 min read
Context Management for Deep Agents

Context Management for Deep Agents

By Chester Curme and Mason Daugherty As the addressable task length of AI agents continues to grow, effective context management becomes critical to prevent context

5 min read
Introducing Agent Builder templates

Deploy agents instantly with Agent Builder templates

Introducing the Agent Builder Template Library: a collection of ready-to-deploy agents for common tasks, equipped with the tools you already use.

agent builder 3 min read

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