@langchain/mcp-adapters

LangChain MCP Adapters by LangChain

LangChain.js adapters for Model Context Protocol (MCP)

Live Registry Versionv2.0.1Previous: v2.0.0Published 2026-10-06

Stability Grade

B (78/100)

90-Day Velocity

3 releases

Stable release cadence

Dependencies

3 direct

NPM manifest

License

MIT

Verified on NPM

Recommended Exact Pin: npm install @langchain/mcp-adapters@2.0.1

NPM Registry ->GitHub Repo ->

TL;DR Verdict & Quick Citation Summary (2026-10-24)Source: AgentBreakWatch Live NPM Index

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 past 90 days. v2.0 requires @langchain/core >= 1.0 and @modelcontextprotocol/sdk >= 1.20; MultiServerMCPClient transport config enforces explicit transport type. Production teams should pin npm install @langchain/mcp-adapters@2.0.1 rather than using unpinned @latest tags.

Breaking Changes & Tool Schema Drift Analysis

v2.0 requires @langchain/core >= 1.0 and @modelcontextprotocol/sdk >= 1.20; MultiServerMCPClient transport config enforces explicit transport type.

Watched Exports / MCP Tool Signatures:

MultiServerMCPClientloadMcpTools

Before (Deprecated / Unpinned Pattern)

const client = new MultiServerMCPClient({ math: { command: "node", args: ["server.js"] } });
await client.initializeConnections();

After (Verified v2.0.1 Pattern)

const client = new MultiServerMCPClient({
  mcpServers: { math: { transport: "stdio", command: "node", args: ["server.js"] } }
});
const tools = await client.getTools();

Frequently Asked Questions: @langchain/mcp-adapters

What is the latest version of @langchain/mcp-adapters on NPM?

As of 2026-10-24, the latest stable version of @langchain/mcp-adapters (LangChain MCP Adapters by LangChain) on NPM is v2.0.1, published on 2026-10-06. It has shipped 3 releases in the last 90 days.

Does @langchain/mcp-adapters v2.0.1 have breaking changes or MCP schema drift risk?

@langchain/mcp-adapters currently carries a HIGH schema drift risk rating with a Stability Score of 78/100 (Grade B). v2.0 requires @langchain/core >= 1.0 and @modelcontextprotocol/sdk >= 1.20; MultiServerMCPClient transport config enforces explicit transport type.

How do I safely pin @langchain/mcp-adapters in production?

Avoid unpinned @latest tags in production agent configs. Pin the exact verified version using `npm install @langchain/mcp-adapters@2.0.1` and monitor MultiServerMCPClient, loadMcpTools for parameter or schema changes.

30-Min Registry & Schema Poller

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