TypeScript SDK

@kakunin/sdk — official TypeScript SDK for registering agents, issuing certificates, ingesting behavioral events, and verifying identities.

Installation

npm install @kakunin/sdk

Requires Node.js 18+. Works in browser environments that support the Web Crypto API.

Quickstart

Seven lines from zero to a certified, monitored agent:

import { Kakunin } from '@kakunin/sdk';

const kkn = new Kakunin({ apiKey: process.env.KKN_KEY! });

// 1. Register the agent
const agent = await kkn.agents.create({
  name: 'Invoicing Bot v3.2',
  model_hash: await Kakunin.computeModelHash('gpt-4o-2024-08'),
  model: 'gpt-4o',
  version: 'v3.2.1',
  permitted_actions: ['read:invoices', 'write:drafts'],
});

// 2. Issue an X.509 certificate — < 3s end-to-end
const cert = await kkn.agents.certify(agent.id);
console.log(cert.serial_number); // c4f9-17a2-6b8e
console.log(cert.expires_at);    // 2027-05-20T...

// 3. Stream each agent action
const event = await kkn.events.ingest({
  agentId: agent.id,
  actionType: 'transaction_initiated',
  details: { amount: 840, currency: 'EUR', venue: 'euronext' },
});
// → { risk_score: 0.12, risk_band: 'low', revocation_check_queued: false }

Configuration

const kkn = new Kakunin({
  apiKey: 'kkn_live_...',   // or kkn_test_... for sandbox
  baseUrl: 'https://api.kakunin.ai/v1',  // default
  timeoutMs: 10_000,          // per-request timeout, default 10s
  maxRetries: 3,              // retries on 5xx / network errors
});

Sandbox mode

Use a kkn_test_... key to hit the sandbox CA. Test certs are real X.509 certificates but have no regulatory validity. Up to 100 free test certs per day.

const sandbox = new Kakunin({ apiKey: 'kkn_test_...' });
console.log(sandbox.isSandbox()); // true

Agents

`kkn.agents.create(params)`

const agent = await kkn.agents.create({
  name: 'Trading Bot',
  model_hash: 'sha256:8f3c...2a91',  // see computeModelHash below
  model: 'gpt-4o',
  version: 'v1.0.0',
  financial_scope: {
    max_single_trade_usd: 50_000,
    daily_limit_usd: 500_000,
    permitted_instruments: ['EUR/USD', 'BTC/EUR'],
    permitted_venues: ['euronext', 'xetra'],
    leverage_permitted: false,
  },
});

Parameter	Type	Required	Description
`name`	`string`	✓	Human-readable agent name
`model_hash`	`string`	✓	SHA-256 of model weights/config. See `computeModelHash`.
`model`	`string`	—	Model identifier e.g. `gpt-4o`
`version`	`string`	—	Semver or build tag
`financial_scope`	`FinancialScope`	—	Encoded in the X.509 cert
`metadata`	`object`	—	Arbitrary key-value pairs

`kkn.agents.certify(agentId)`

Issues an X.509 certificate via AWS KMS. Private key never leaves the HSM.

const cert = await kkn.agents.certify(agent.id);
// cert.certificate_pem — full X.509 PEM
// cert.serial_number   — use for verification
// cert.expires_at      — 365 days (MiCA Art. 70)

Returns 409 if agent already has an active certificate. Returns 422 if model_hash is not set on the agent.

`kkn.agents.get(agentId)`

Fetch a single agent including certificate history.

const agent = await kkn.agents.get('agt_8f3c2a91d4');
console.log(agent.certificates); // sorted newest-first

`kkn.agents.list(params?)`

const { data, meta } = await kkn.agents.list({ status: 'active', limit: 50 });

`kkn.agents.update(agentId, params)`

await kkn.agents.update(agent.id, { version: 'v3.3.0', model_hash: newHash });

`kkn.agents.getRisk(agentId)`

Rolling 30-day risk profile — drift score, event breakdown, trend, and recent high-risk events.

const risk = await kkn.agents.getRisk(agent.id);

if (risk.dominant_band === 'high') {
  console.warn('Agent at high risk. Recent events:', risk.recent_high_risk_events);
}

console.log(risk.drift.drift_score);   // null until 30d baseline established
console.log(risk.drift.drift_trend);   // 'increasing' | 'decreasing' | 'stable'

Events

`kkn.events.ingest(params)`

Stream a behavioral event. Returns risk score synchronously (p99 200ms).

const result = await kkn.events.ingest({
  agentId: agent.id,
  actionType: 'transaction_initiated',
  details: { amount: 840, currency: 'EUR' },
  sessionId: 'sess_abc123',   // optional grouping
  occurredAt: new Date().toISOString(),  // defaults to server now()
});

console.log(result.risk_score);               // 0.12
console.log(result.risk_band);                // 'low'
console.log(result.revocation_check_queued);  // true if band === 'high'

Action types:

Type	Band (default)	Description
`api_call`	low	Standard API invocation
`authentication_attempt`	low	Login / token request
`authentication_failure`	medium	Failed auth
`data_access`	low	Read operation on data
`data_mutation`	medium	Write / delete operation
`transaction_initiated`	medium	Financial transaction
`transaction_anomaly`	high	Transaction outside normal pattern
`unauthorized_access_attempt`	high	Scope violation attempt
`message_signed`	low	Agent signed a message with KMS
`message_verification_failed`	medium	Signature verification failed

unauthorized_access_attempt is auto-elevated by the platform when a transaction_initiated event exceeds the financial scope encoded in the agent's certificate (amount > max_single_trade_usd or venue not in permitted_venues). You do not need to set this manually.

`kkn.events.list(params?)`

Cursor-based pagination, newest-first.

const page1 = await kkn.events.list({ agent_id: agent.id, band: 'high', limit: 20 });

// Next page
if (page1.pagination.has_next_page) {
  const page2 = await kkn.events.list({ before: page1.pagination.next_cursor });
}

Certificates

`kkn.certificates.revoke(certificateId, params)`

Manually revoke a certificate. Also suspends the agent. Triggers CRL regeneration and fires a certificate.revoked webhook.

await kkn.certificates.revoke(cert.id, {
  reason: 'Compromised model weights detected in supply chain audit',
});

Verify (public — no auth required)

`kkn.verify.cert(serial)`

Anyone — regulators, counterparties, auditors — can verify an agent's certificate without an API key. Globally CDN-cached, p99 < 500ms.

const agent = await kkn.verify.cert('c4f9-17a2-6b8e');

if (agent.status !== 'active') throw new Error('Certificate not active');
if (!agent.permitted_actions.includes('write:drafts')) throw new Error('Scope exceeded');

console.log(agent.issuer);      // "Kakunin Certificate Authority"
console.log(agent.model_hash);  // sha256:8f3c...2a91

Webhooks

`kkn.webhooks.constructEvent(rawBody, signature, secret)`

Verify HMAC-SHA256 webhook signatures before processing. Pass the raw request body string — do not JSON-parse first.

// Next.js App Router
export async function POST(req: Request) {
  const rawBody = await req.text();
  const signature = req.headers.get('x-kakunin-signature') ?? '';

  let event;
  try {
    event = await kkn.webhooks.constructEvent(rawBody, signature, process.env.KKN_WEBHOOK_SECRET!);
  } catch (err) {
    return new Response('Invalid signature', { status: 400 });
  }

  if (event.event === 'certificate.revoked') {
    const { serial_number } = event.data as { serial_number: string };
    // Evict from local cache so next verify call sees the revocation
    await purgeVerifyCache(serial_number);
  }

  return new Response('OK');
}

Webhook event types: certificate.issued · certificate.revoked · risk.alert · agent.created · agent.updated

`Kakunin.computeModelHash(input)`

Compute a SHA-256 hash of model weights or a config string. This binds the agent's certificate to an exact model version — any model update requires a new cert.

// From a config string (deterministic for known models)
const hash = await Kakunin.computeModelHash(JSON.stringify({
  provider: 'openai',
  model: 'gpt-4o',
  version: '2024-08-06',
}));
// → sha256:3e4a...f12b

// From model weights file (Node.js)
import { readFileSync } from 'fs';
const weights = readFileSync('./model.safetensors');
const hash = await Kakunin.computeModelHash(weights);

Error handling

All errors are instances of KakuninError with .status and .code:

import { Kakunin, KakuninError, KakuninAuthError, KakuninRateLimitError } from '@kakunin/sdk';

try {
  await kkn.agents.certify(agentId);
} catch (err) {
  if (err instanceof KakuninRateLimitError) {
    console.warn(`Rate limited. Retry after ${err.retryAfter}s`);
  } else if (err instanceof KakuninAuthError) {
    console.error('Invalid API key');
  } else if (err instanceof KakuninError) {
    console.error(`API error ${err.status}: ${err.message} (${err.code})`);
  }
}

The client automatically retries 5xx and network errors with exponential backoff (default: 3 retries). 429 rate-limit errors wait Retry-After before retrying.

Acceptance-side middleware — `@kakunin/verify`

For enforcing certificates on inbound requests to your API (not agent registration), use the separate @kakunin/verify package:

npm install @kakunin/verify

import { kakuninMiddleware } from '@kakunin/verify';

// Next.js middleware.ts
const enforce = kakuninMiddleware({ onVerifyTimeout: 'fail-closed' });

export async function middleware(req: NextRequest) {
  const { agent, reject } = await enforce(req);
  if (!agent) return reject('Missing or invalid agent certificate');
  // agent.permitted_actions is now typed and verified
}

See the enforcement guide for full usage.

Supabase RLS AI Agent Database Protection

The @kakunin/verify package includes native database adapters to bind agent session certificates directly to database connection pools. By using Supabase RLS AI Agent Database Protection, you can ensure that agents can only query data matching their cryptographically signed context:

import { createClient } from '@supabase/supabase-js';
import { bindAgentSession } from '@kakunin/verify/supabase';

// In your Express or Serverless handler:
const agentSerial = req.headers['x-kakunin-cert-serial'];
const supabase = createClient(SUPABASE_URL, SUPABASE_ANON_KEY);

// Bind the active agent's certificate serial to the Supabase client
const secureSupabase = bindAgentSession(supabase, agentSerial);

// Now all queries execute under the agent's RLS policy context automatically
const { data, error } = await secureSupabase
  .from('transactions')
  .select('*');

This enforces row-level isolation and prevents data exfiltration even if the model attempts to generate unauthorized database queries.

Environment variables

# Required
KKN_KEY=kkn_live_...          # or kkn_test_... for sandbox

# Optional — for webhook verification
KKN_WEBHOOK_SECRET=whsec_...  # from dashboard → Webhooks → signing secret

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