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.KAKUNIN_API_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: 'kak_live_...',   // or kak_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 kak_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: 'kak_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.KAKUNIN_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/sdk/verify`

For enforcing certificates on inbound requests to your API (not agent registration), use the verify subpath of the SDK:

npm install @kakunin/sdk

import { kakuninMiddleware } from '@kakunin/sdk/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 binding — `@kakunin/sdk/verify/supabase`

Bind a verified agent certificate to a Supabase client so Postgres Row-Level Security constrains every query to the agent's identity and scopes. The SDK verifies the cert (fail-closed), then mints a short-lived Supabase JWT — its lifetime never exceeds the certificate's expiry.

Requires the @supabase/supabase-js peer dependency. Server-side only — the Supabase JWT secret must never reach a browser or client bundle.

import { bindAgentSession } from '@kakunin/sdk/verify/supabase';

const supabase = await bindAgentSession({
  supabaseUrl: process.env.SUPABASE_URL!,
  supabaseAnonKey: process.env.SUPABASE_ANON_KEY!,
  supabaseJwtSecret: process.env.SUPABASE_JWT_SECRET!, // server-side secret
  serial: req.headers.get('x-kakunin-cert-serial')!,
});

// Every query is RLS-scoped to the agent via auth.jwt() ->> 'sub'
const { data } = await supabase.from('trades').select('*');

-- Supabase RLS policy: agents can only read their own rows
create policy "agents read own rows" on trades for all
  using ( agent_id = (auth.jwt() ->> 'sub') );

bindAgentSession throws KakuninVerifyError for revoked, expired, or unverifiable certificates — no client is returned in that case. The agent's permitted_actions are carried in the JWT's app_metadata.scopes claim for scope-aware policies.

Environment variables

# Required
KAKUNIN_API_KEY=kak_live_...          # or kak_test_... for sandbox

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

On this page