2026年2月：LangChainニュースレター

imageFebruary gave us only twenty-eight days, but we made them count. From new Agent Builder capabilities to production monitoring insights, here's your monthly roundup of updates from the LangChain team.

What’s new for LangChain?

LangSmith

 Agent Builder now has a central chat with all your tools, one-click conversation-to-agent, file uploads, and a unified tool registry. Learn more.

⚙️ Configure which parts of a trace’s inputs and outputs appear directly in the tracing table. Learn more.

  Schedule reports to run daily, weekly, or on a custom cadence with Insights Agent. Learn more.

 Pin any experiment as your baseline and instantly see performance deltas across every run without manual side-by-side comparison. Learn more.

Open Source

 ⌛deepagents v0.4 allows you to run your agents in fully isolate sandboxes. Learn more.

Interrupt 2026

Interrupt 2026 tickets are live! Join us May 13-14 at The Midway in San Francisco for two days of can't-miss keynotes, hands-on workshops, and real-world production stories from teams building agents at scale. Hear from Andrew Ng, Harrison Chase, and AI teams at Clay, Rippling, and more. This is the event for anyone serious about agents. Grab your ticket before seats are gone. Tickets on sale now

Speak the Lang

See our favorite use cases, best practices, and customer stories covering the most top-of-mind topics in the AI space.

Production monitoring for agents

Traditional monitoring tools weren't built for agents. Their infinite input space, non-deterministic outputs, and multi-step reasoning chains require a different approach entirely.

We broke down what production observability for agents actually looks like, and what we've learned from teams deploying at scale. Read the full piece.

Improving Deep Agents with harness engineering

Our coding agent jumped from Top 30 to Top 5 on Terminal Bench 2.0, without touching the model. The secret was harness engineering: self-verification loops, loop detection middleware, and using LangSmith traces as a feedback signal to systematically debug failure modes at scale. Read how we did it.

Tracing in LangSmith is as easy as copy/paste

Get started in seconds with Claude Agent SDK, OpenAI, LangChain, Vercel AI SDK, and 20+ other frameworks. Pick your stack, copy the code, start debugging. Get started here.

LangChain Academy course: Building reliable agents

Learn how to take an agent from first run to production-ready system through iterative cycles of improvement. You’ll learn how to do this with LangSmith, our agent engineering platform for observing and evaluating agents. Enroll for free in the new course.

欄 Customer story highlight

monday.com Service sped up their evals feedback loop nearly 9x by making evals a day 0 requirement using LangSmith. Read their full story.

Upcoming Events

 (March 3) Chicago // Community Meetup: Detecting Errors Early with LangSmith.

Join Focused's Lead Agent Engineer for a practical discussion on building and operating production-ready AI applications with LangSmith. RSVP here.

 (March 4) San Francisco // LangChain Presents: Deep Agents Meetup

Join us for a fireside chat on Deep Agents featuring LangChain's Python OSS Engineer Sydney Runkle and Deployed Eng Jake Broekhuizen. RSVP here.

 (March 6) London // Community Meetup: Agents & Knowledge Graphs Hackathon

Explore how agents can move beyond demos at this weekend hackathon. Organized by Ambassador Sudip Kandel in partnership with SurrealDB. RSVP here.

 (March 18) San Francisco // Contrary SF Tech Talk

We’re hosting Contrary's next SF Tech Talk, featuring engineering leads from Cognition, ElevenLabs, Baseten, and Ando speaking about the future of agents. RSVP here.

 (March 19) San Francisco // LangChain Presents: It Worked on My Laptop - Agents in Production

Join Victor Moreira, Deployed Eng at LangChain, as he explains why agent observability has distinct challenges, what you need to monitor, and what we've learned from teams deploying agents at scale. RSVP here.

 (March 22) Stockholm // Community Meetup: Lovable x LangChain Proptech/Contech Hackathon

Join LangChain and Lovable for a one-day hackathon in Stockholm. Build AI solutions for Real Estate & Construction with next gen AI tools. Organized by Ambassador Gustaf Gyllensporre. RSVP here.

 (March 24) New York // LangChain Presents: It Worked on My Laptop - Agents in Production

Join Robert Xu, Deployed Eng at LangChain, as he explains why agent observability has distinct challenges, what you need to monitor, and what we've learned from teams deploying agents at scale. RSVP here.

 (March 26) Amsterdam // Community Meetup: The Rise of Autonomous Systems

Get practical POVs on architectures, runtime, and the evolving role of platforms in enabling reliable AI at scale — with speakers from LangChain, AWS, Qodo, and SurrealDB. Organized by Ambassador Sri Rang. RSVP here.

 (March 26) Mexico City // Community Meetup: Agents in Production

Join the Google Cloud team as they build an agent live and deploy it on GCP. Ambassador Adrian Sanchez Castro (Semantiks) and the Draftea team will also share how AI agents are transforming the customer experience. RSVP here.

 (March 27) San Francisco // LangSmith for Startups Presents: Office Hours Join us for this Startups-focused office hours session. Come ask our eng teams your burning LangSmith questions and give feedback. RSVP here..

 (March 29) New York // LangSmith for Startups Presents: Sunday Hacking Brunch

Join us for a Sunday hacking brunch with crêpes and coffee + fellow founders and founding engineers using LangSmith. Get work done, come hang out, and ask our team LangSmith-related questions. RSVP here.

 (April 2) Miami // Community Meetup: Evals 102

Expect a no-fluff deep dive into advanced evals patterns for AI agents. Organized by Ambassador Andres Torres at Co-Work LatAm. RSVP here.