# LangChain MCP Adapters (@langchain/mcp-adapters) - AgentBreakWatch Reference

> TL;DR Verdict: LangChain MCP Adapters (`@langchain/mcp-adapters`) is currently at v2.0.1 on NPM (published 2026-10-06), with a 90-day Stability Score of 78/100 (B) and HIGH schema drift risk across 3 releases in the last 90 days. v2.0 requires @langchain/core >= 1.0 and @modelcontextprotocol/sdk >= 1.20; MultiServerMCPClient transport config enforces explicit transport type.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/langchain-mcp-adapters
- Category Hub: https://agentbreakwatch.vercel.app/c/agent-sdks (AI Agent SDKs & Frameworks Breaking-Change Index)
- Package Name: `@langchain/mcp-adapters`
- Registry: NPM (https://www.npmjs.com/package/@langchain/mcp-adapters)
- GitHub Repository: https://github.com/langchain-ai/langchainjs
- Vendor: LangChain
- Latest Live Version: v2.0.1
- Published Date: 2026-10-06T00:47:45.106Z
- 90-Day Release Count: 3
- Direct Dependencies: 3
- License: MIT
- Stability Score: 78/100 (Grade B)
- Schema Drift Risk: HIGH
- Recommended Exact Pin Command: `npm install @langchain/mcp-adapters@2.0.1`
- Watched Symbols / MCP Tools: MultiServerMCPClient, loadMcpTools
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
v2.0 requires @langchain/core >= 1.0 and @modelcontextprotocol/sdk >= 1.20; MultiServerMCPClient transport config enforces explicit transport type.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
const client = new MultiServerMCPClient({ math: { command: "node", args: ["server.js"] } });
await client.initializeConnections();
```

## Migration Diff: After (Verified v2.0.1 Pattern)
```
const client = new MultiServerMCPClient({
  mcpServers: { math: { transport: "stdio", command: "node", args: ["server.js"] } }
});
const tools = await client.getTools();
```

## Recent Verified Releases
- v2.0.1 (published 2026-10-06) [LATEST]
- v2.0.0 (published 2026-10-01)
- v1.1.4 (published 2026-08-20)
- v1.1.3 (published 2026-02-12)
- v1.1.2 (published 2026-01-22)
- v1.1.1 (published 2025-12-18)