LangChain

npm install @grantex/langchain @grantex/sdk @langchain/core

import { createGrantexTool } from '@grantex/langchain';

const tool = createGrantexTool({
  name: 'read_calendar',
  description: 'Read upcoming calendar events',
  grantToken,                     // JWT from Grantex token exchange
  requiredScope: 'calendar:read', // must be in token's scp claim
  func: async (input) => {
    return JSON.stringify(await getCalendarEvents(input));
  },
});

// Use with any LangChain agent
const agent = createToolCallingAgent({ llm, tools: [tool], prompt });

import { Grantex } from '@grantex/sdk';
import { GrantexAuditHandler } from '@grantex/langchain';

const client = new Grantex({ apiKey: process.env.GRANTEX_API_KEY });

const auditHandler = new GrantexAuditHandler({
  client,
  agentId: 'ag_01ABC...',
  agentDid: 'did:key:z6Mk...',
  principalId: 'user_01',
  grantToken,
});

const result = await agentExecutor.invoke(
  { input: 'What meetings do I have today?' },
  { callbacks: [auditHandler] },
);