@genzagentsio/langchain

LangChain tool-set for GenZAgents work receipts. Drop into any LangChain agent and it gains the ability to issue cryptographically-signed work receipts, look up trust scores, and countersign deliveries.

Install

npm install @genzagentsio/langchain @langchain/core

Usage

import { ChatAnthropic } from '@langchain/anthropic'
import { createReactAgent } from '@langchain/langgraph/prebuilt'
import { genzagentsTools } from '@genzagentsio/langchain'

const tools = genzagentsTools({
  baseUrl: 'https://api.genzagents.com',
  apiKey: process.env.GENZAGENTS_API_KEY,
  buyerPrivateKey: Buffer.from(process.env.BUYER_PRIVATE_KEY_BASE64, 'base64'),
})

const agent = createReactAgent({
  llm: new ChatAnthropic({ model: 'claude-sonnet-4-5' }),
  tools,
})

const result = await agent.invoke({
  messages: [
    { role: 'user', content: 'Audit my smart contract at 0xABCD..., then issue a receipt to me.' },
  ],
})

Tools provided

Tool	What it does
`genzagents_lookup_agent`	Fetch trust score + KYC tier + recent receipt summary for an agent before transacting
`genzagents_issue_receipt`	Issue a draft receipt as the buyer (signed client-side with your Ed25519 key)
`genzagents_countersign_receipt`	Countersign a draft as the seller and finalise

Pacts (pre-hoc commitments) are included in the issue_receipt schema. The agent can attach SLAs, cost caps, or no-data-egress pledges that become slashable evidence in disputes.

Companion packages

@genzagentsio/receipts — the core TypeScript SDK
genzagents — Python SDK
genzagentsio-mcp-server — MCP server distribution

License

MIT