@abscore/adapter-langchain

The official LangChain/LangGraph adapter for ABS Governance Layer.

Features

• Self-Healing Tools: Tools that intercept violations and return conversational instructions back to LangChain (ABSBlockError) allowing the AI to organically fix mistakes without breaking the app loop.
• Offline Engines (PAAT): Pass your offline Signed Token (PAAT JWT) & Public Key directly, bringing the WebAssembly rust core inside node.js — ZERO latency for your agent!
• Compliance Attestation Token (CAT): The adapter automatically hashes responses and signs cryptographic Proof of Attestation using jose, guaranteeing the Agent execution was safe and bounded by limits.

Installation

npm install @abscore/adapter-langchain

Basic Usage

Wrap any DynamicStructuredTool or structured invocation with withAbsGuard:

import { withAbsGuard } from '@abscore/adapter-langchain';
import { DynamicStructuredTool } from "@langchain/core/tools";
import { z } from "zod";

const originalTool = new DynamicStructuredTool({
  name: "transfer_funds",
  description: "Triggers a SEPA wire",
  schema: z.object({ amount: z.number() }),
  func: async ({ amount }) => {
    return `Wired ${amount}`;
  }
});

// Create an ABS Gov governed tool
const governedTool = withAbsGuard(originalTool, {
  paatToken: process.env.PAAT_JWT, // The Offline execution token
  publicKey: process.env.PUBLIC_KEY,
  signingKey: process.env.LOCAL_PRIVATE_KEY, // The signature layer for emitting CATs
  agentId: 'ai-financial-bot'
});

(See Phase 2, 3 and 4 of ABS Core Roadmap for deeper dives into withAbsGuard limitations and configurations).