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The LangChainAdapter converts MCP tools into LangChain’s DynamicStructuredTool format.

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Installation

npm install @mcp-ts/sdk @langchain/core zod

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Usage

import { MultiSessionClient } from '@mcp-ts/sdk/server';
import { LangChainAdapter } from '@mcp-ts/sdk/adapters/langchain';

const client = new MultiSessionClient('user_123');
await client.connect();

const adapter = new LangChainAdapter(client);
const tools = await adapter.getTools();

// Use with LangChain agent
const agent = createReactAgent({
  llm,
  tools,
  // ...
});

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Configuration

The LangChainAdapter supports simplified error messages, which can be useful for LLMs to better understand failures: 
const adapter = new LangChainAdapter(client, {
  simplifyErrors: true  // Returns error.message instead of full error object
});

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API Reference

See the LangChainAdapter API Reference for more details.