themis-policy-langchain

Wraps a LangChain Tool — or anything duck-typed like one: a named object with call, invoke, func or _call — so every invocation is evaluated by a Themis policy engine first.

import { DynamicTool } from '@langchain/core/tools';
import { gateTool } from 'themis-policy-langchain';

const raw = new DynamicTool({ name: 'send_invoice', description: 'Sends an invoice', func: sendInvoice });
const safe = gateTool(raw, { engine, requestor, tenant_id });