# LangGraph.js (@langchain/langgraph) - AgentBreakWatch Reference

> TL;DR Verdict: LangGraph.js (`@langchain/langgraph`) is currently at v1.5.2 on NPM (published 2026-10-21), with a 90-day Stability Score of 74/100 (C+) and HIGH schema drift risk across 17 releases in the last 90 days. v1.x StateGraph Annotation reducer syntax and interrupt() resume semantics updated; createReactAgent moved to @langchain/langgraph/prebuilt.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/langgraph-js
- Category Hub: https://agentbreakwatch.vercel.app/c/agent-sdks (AI Agent SDKs & Frameworks Breaking-Change Index)
- Package Name: `@langchain/langgraph`
- Registry: NPM (https://www.npmjs.com/package/@langchain/langgraph)
- GitHub Repository: https://github.com/langchain-ai/langgraphjs
- Vendor: LangChain
- Latest Live Version: v1.5.2
- Published Date: 2026-10-21T19:43:17.464Z
- 90-Day Release Count: 17
- Direct Dependencies: 4
- License: MIT
- Stability Score: 74/100 (Grade C+)
- Schema Drift Risk: HIGH
- Recommended Exact Pin Command: `npm install @langchain/langgraph@1.5.2`
- Watched Symbols / MCP Tools: StateGraph, Annotation, interrupt, Command
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
v1.x StateGraph Annotation reducer syntax and interrupt() resume semantics updated; createReactAgent moved to @langchain/langgraph/prebuilt.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
const workflow = new StateGraph({ channels: { messages: { value: (a, b) => a.concat(b) } } });
```

## Migration Diff: After (Verified v1.5.2 Pattern)
```
const State = Annotation.Root({ messages: Annotation({ reducer: (a, b) => a.concat(b) }) });
const workflow = new StateGraph(State);
```

## Recent Verified Releases
- v1.5.2 (published 2026-10-21) [LATEST]
- v1.5.1 (published 2026-10-16)
- v1.5.0 (published 2026-10-12)
- v1.4.21 (published 2026-10-07)
- v1.4.20 (published 2026-10-06)
- v1.4.19 (published 2026-10-03)