LangChain tools

@zerodust/langchain (0.2.1) gives a LangChain agent read-only ZeroDust tools: chains, balances, quotes and sweep status. The tools never sign and cannot move funds. To let an agent sweep, use ZeroDustAgent or the MCP server.

Install

npm install @zerodust/langchain @langchain/core zod

Peer dependencies: @langchain/core >=0.2.0 and zod >=3.22.0 (built against @langchain/core 0.3). It installs its own @zerodust/sdk 0.1.x for the API calls.

Usage

createZeroDustTools(config?) returns an array of DynamicStructuredTool, usable with any LangChain agent.

import { createZeroDustTools } from '@zerodust/langchain';
import { ChatOpenAI } from '@langchain/openai';
import { AgentExecutor, createToolCallingAgent } from 'langchain/agents';
import { ChatPromptTemplate } from '@langchain/core/prompts';

const tools = createZeroDustTools({ environment: 'mainnet' });

const llm = new ChatOpenAI({ model: 'gpt-4o' });
const prompt = ChatPromptTemplate.fromMessages([
  ['system', 'You are a helpful blockchain assistant.'],
  ['human', '{input}'],
  ['placeholder', '{agent_scratchpad}'],
]);

const agent = createToolCallingAgent({ llm, tools, prompt });
const executor = new AgentExecutor({ agent, tools });

const result = await executor.invoke({ input: 'Check my balances on 0x...' });

Any chat model with tool calling works; @langchain/openai is only an example.

The config takes the SDK client options: environment, baseUrl, apiKey, timeout, retries.

Tools

Each tool returns a text summary.