Agent Auth (AAuth) — Quickstart

This quickstart walks through the essential steps to set up AAuth: generate a key pair, register an agent and a resource, then make your first authenticated call. AAuth is the identity protocol for agents: an agent proves who it is by signing each request with its own private key instead of sending a shared secret. AAuth uses Ed25519 keys (a modern elliptic-curve signature scheme: short keys, fast, widely supported). It sends every call as a signed HTTP request: a cryptographic signature over specific parts of the request (method, path, selected headers, body digest). That signature gives a replay-proof, per-request proof that the agent holds its key.

Prerequisites

• Access to a LumoAuth organization (e.g., acme-corp); agent identity (AAuth) is available on every plan, nothing to switch on
• Node.js 18+ or Python 3.9+
• Basic familiarity with OAuth 2.0 concepts
• A server environment that can generate Ed25519 or RSA key pairs

Step 1: Generate a key pair

AAuth requires cryptographic keys. Generate an Ed25519 key pair:

// Node.js
const crypto = require('crypto');

const { publicKey, privateKey } = crypto.generateKeyPairSync('ed25519', {
  publicKeyEncoding: { type: 'spki', format: 'pem' },
  privateKeyEncoding: { type: 'pkcs8', format: 'pem' }
});

// Convert public key to raw bytes for JWK
const publicKeyBytes = Buffer.from(
  publicKey.replace(/-----BEGIN PUBLIC KEY-----|-----END PUBLIC KEY-----|\n/g, ''),
  'base64'
).slice(-32);

const jwks = {
  keys: [{
    kty: 'OKP',
    crv: 'Ed25519',
    x: publicKeyBytes.toString('base64url'),
    use: 'sig',
    kid: 'key-1'
  }]
};

console.log('JWKS:', JSON.stringify(jwks, null, 2));
console.log('\nPrivate Key (save securely):');
console.log(privateKey);

# Python
from cryptography.hazmat.primitives.asymmetric import ed25519
from cryptography.hazmat.primitives import serialization
import base64
import json

# Generate key pair
private_key = ed25519.Ed25519PrivateKey.generate()
public_key = private_key.public_key()

# Export public key
public_bytes = public_key.public_bytes(
    encoding=serialization.Encoding.Raw,
    format=serialization.PublicFormat.Raw
)

jwks = {
    "keys": [{
        "kty": "OKP",
        "crv": "Ed25519",
        "x": base64.urlsafe_b64encode(public_bytes).decode().rstrip('='),
        "use": "sig",
        "kid": "key-1"
    }]
}

print('JWKS:', json.dumps(jwks, indent=2))
print('\nSave your private key securely!')

Key storage

Keep private keys on the server, never in source control or client-side code. Prefer an HSM or secret manager in production.

Step 2: Register your agent

Register your agent in the Organization Portal, or use the Admin API for programmatic registration. In the portal, go to AI Agents → Agents and click Register agent. The form is a three-step wizard. Step 1, Who is this agent, asks for a name and description. Step 2, How it proves its identity, is where you choose AAuth and give the identifier and keys. Step 3, What it may do, covers capabilities, acting for people and budget.

Field	Example value	Description
Agent name	My First Agent	Human-readable agent name (step 1)
Description	Testing AAuth protocol	Optional description (step 1)
Agent identifier	https://my-agent.example.com	(Step 2) Identifier that uniquely names your agent. The form describes it as local@domain form (like an email address) and does not enforce a format; whatever you enter must exactly match the agent_identifier that your code uses
JWKS (inline)	Paste your JWKS from Step 1	(Step 2) Your agent's public keys (or give a JWKS URL where the agent publishes them)
Pre-authorized scopes	read and write, one per line	(Step 3) Scopes that this agent gets without anyone being asked, in the Acting for people section

On step 3, in Acting for people, switch on:

• ✅ User-in-the-loop authorization
• ✅ Delegation to sub-agents

Click Next to reach the review, then Register agent.

Redirect URIs (for example https://my-agent.example.com/oauth/callback, where authorization codes are sent) are not part of the registration form. Add them afterwards by editing the AAuth registration (Redirect URIs field).

Step 3: Register a resource

Register the protected API that your agent will call. Go to AI Agents → Agents, open the AAuth resources tab and click Register resource:

Field	Example value
Resource name	Reporting API
Resource identifier	https://api.example.com (any unique https:// URL)
JWKS URI	https://api.example.com/.well-known/jwks.json
Scopes	One row per scope: the name that agents ask for and a description shown on the consent screen, for example read and write
Default auth level	Authorized

Click Register resource. Registered resources are listed on the AAuth resources tab of the Agents page.

Step 4: Make your first request

Choose a language or framework for a complete, copy-paste example:

Framework / Language	Guide
Python (LumoAuth SDK)	View example →
JavaScript / Node.js	View example →
LangChain / LangGraph	View example →
CrewAI	View example →
OpenAI Agents SDK	View example →

Next steps

• AAuth Protocol spec — full protocol details
• Agent Registry — manage agent registrations, budgets, and capabilities
• JIT Permissions — add permission escalation per operation

Standards used on this page

Plain name	Standard
Signed HTTP requests (HTTP message signatures)	RFC 9421

See the standards reference for what each one covers and how LumoAuth uses it.