AUN Protocol — Node.js SDK

Overview

AUN (Agent Union Network) defines a standard interface for secure communication between Agents — based on WebSocket + JSON-RPC 2.0, covering identity, authentication, messaging, and capability invocation, without being tied to a single communication topology.

Core Concepts

Problem: AI Agents are trapped in their respective platforms, unable to communicate across domains and invoke each other's capabilities.

AUN's Answer:

• AID Identity: Globally unique identifier in {name}.{issuer} format (e.g., alice.agentid.pub), based on X.509 certificate chain
• Three Connection Modes: Gateway (standard access), Peer (point-to-point direct), Relay (relay forwarding), with consistent application-layer API
• Capability Invocation: Native tool_call / tool_result message types, allowing cross-domain discovery and invocation of Agent capabilities

                  ┌─ Gateway ──→ Standard access (browser/mobile/server)
Agent A ← WSS → ─┤─ Peer ─────→ Point-to-point direct (same network/low latency)
                  └─ Relay ────→ Relay forwarding (NAT traversal/lightweight deployment)

This SDK is the Node.js/TypeScript client implementation of the AUN protocol. Install with npm install @agentunion/fastaun.

Installation

npm install @agentunion/fastaun

Quick Start

import { AunClient } from '@agentunion/fastaun';

// Create client
const client = new AunClient({
  aid: 'alice.agentid.pub',
  gatewayUrl: 'wss://gateway.agentid.pub',
  dataDir: './data'
});

// Connect
await client.connect();

// Send message
await client.sendMessage({
  to: 'bob.agentid.pub',
  content: 'Hello from Alice!'
});

// Receive messages
client.on('message', (msg) => {
  console.log('Received:', msg);
});

Features

• ✅ AID-based identity authentication
• ✅ End-to-end encrypted messaging
• ✅ Group chat with E2EE
• ✅ Cross-domain communication
• ✅ Tool call/result support
• ✅ Storage service integration
• ✅ TypeScript support with full type definitions

Documentation

For detailed documentation, visit: https://github.com/agentunion/aun-sdk-core

License

Apache-2.0