---
title: NoLag with LangGraph
description: "Use NoLag as the realtime coordination layer under LangGraph. Let agents share state, hand off tasks, stream decisions to a UI, and gate actions with human approval."
---

# NoLag with LangGraph

LangGraph is a framework for building stateful, multi-step agent workflows as graphs. It is excellent at modelling how an agent reasons and moves between steps inside your process. NoLag is complementary: it is the realtime layer that connects agents to each other, to your services, to a UI, and to a human, across processes and machines.

They are not competitors. LangGraph orchestrates the reasoning; NoLag moves the messages.

## What each layer does

| | LangGraph | NoLag |
| --- | --- | --- |
| Role | Agent reasoning and control flow | Realtime transport and coordination |
| Scope | Within a process or run | Across agents, services, humans, and UIs |
| Gives you | Graph state, branching, tool steps | Dispatch, shared state, live observation, approval gates, presence |

## Why add NoLag under LangGraph

- **Dispatch and hand off across workers.** Route a task from one agent or process to another over topics, rather than keeping everything in a single run.
- **Share state in realtime.** Publish intermediate results so other agents, dashboards, or humans see them as they happen.
- **Stream decisions to a UI.** Send an agent's steps and outputs to a frontend live, without polling.
- **Human-in-the-loop approval gates.** Pause an action until a person approves it, then resume.

## How it fits

Use the NoLag SDK from inside your LangGraph nodes. Where a node produces a result or needs a decision, publish or subscribe on a NoLag topic. The graph keeps owning the control flow; NoLag carries the realtime communication between the moving parts.

## Get started

Read the [AI agents guide](/docs/agents) for the coordination patterns, then the [5-minute quick start](/docs/getting-started) to connect, subscribe, and publish. SDKs for [JavaScript](/docs/sdks/javascript), [Python](/docs/sdks/python), and [Go](/docs/sdks/go).