Build with KYE Protocol™

Build with KYE™. Sign every call. Replay every decision.

The open Entity Trust Control Plane for AI-native systems. Verify, govern, monitor and audit every AI agent, model, tool, dataset, service, organisation and counterparty. Schemas + vocabulary + conformance fixtures are Apache 2.0; the runtime + commercial Pack SKUs (Data Governance, Agent Dev Kit) are paid.

Quickstart → API reference Try the sandbox

Plain Q&A

Short questions. Short answers.

What is KYE™? A protocol for AI governance.
What does the SDK do? It signs every call. It verifies every reply.
Which language? TypeScript, Python, or Go.
Do I need a key? Yes. You keep it.
Free to use? Yes. Apache 2.0.
Sandbox tokens? Free. One click.
Pilot tokens? Free for 30 days.
Do you log my data? No. Not ever.

The numbers (today, on main)

276

JSON Schemas 2020-12

181

REST operations (OpenAPI)

133

Conformance fixtures

Rule packs (+ 17 sector packs)

Canonical dictionaries

289

Control-mapping rows (13 frameworks)

What you’ll build with

API reference

181 operations grouped by tag: entities, authority, delegation, decisions, evidence, signals, audit, continuity, data-governance (§31), payments, recovery.

Browse the API →

Schema catalogue

276 JSON Schema 2020-12 contracts for every object the protocol moves — with 286 validated public examples. New in V1: kye.data_use_manifest.v1, kye.data_asset.v1, kye.dsar_evidence_pack.v1.

Browse schemas →

Conformance fixtures

133 black-box fixtures across 23 categories so you can prove the runtime you build (or vendor) implements KYE faithfully. Run with npm run run against any KYE-compatible gateway.

View fixtures →

SDKs — TS / Python / Go

Three reference SDKs ship from the canonical schemas. TypeScript + Python at full surface parity (114 + 92 tests). Go covers core; extension endpoints rolling out.

Install an SDK →

KYE Agent Dev Kit™ new

Opinionated SDK + CLI for building KYE-aware AI agents. withKye(handler, config) wrapper auto-emits the §0.3 governance event family on every privileged action. 3 starter templates: hello, kyc, payment.

Read the spec →

KYE Data Governance Pack™ new

Runtime data governance for delegated AI actions: data_use PDP stage + 2 rule packs + 5 dictionaries + DSAR Evidence Pack™ assembly. GDPR / UK GDPR / CCPA / PCI / HIPAA cross-walked.

Read the spec →

Sandbox

In-browser PDP playground, evidence-pack composer, webhook simulator, decision-flow visualiser, MCP-server playground.

Open sandbox ↗

Agent-native surfaces

KYE Agent Tool Pack™ (.kye-tool), agent-skills manifest, MCP server card, OpenAPI 3.1 — all auto-discoverable from /.well-known/ for agent-native client libraries.

Agent-native primitives →

Vocabulary

Canonical inventories: entity types, lifecycle states, signal types, reason codes, drift types, decision codes, redaction strategies — all open.

github.com/KYE-Protocol/vocabulary ↗

Five-line PDP example

import { KyeClient } from "@kye-protocol/sdk"; const kye = new KyeClient({ apiKey: process.env.KYE_API_KEY }); const decision = await kye.decisions.create({ actor: "kye:agent:acme.kyc_triage_001", principal:"kye:user:acme.compliance_lead", capability:"kyc.verify", action: "kyc.verify", context: { customer_id: "cust_001", region: "EU" } }); console.log(decision.decision, decision.reason_code); // → "allow" "policy_allow_default"

Or the new KYE Agent Dev Kit™ one-line wrapper

import { withKye } from "@kye/agent-dev-kit"; export const handler = withKye( async (ctx, input) => { await ctx.runtime.emitToolCall({ tool: "greet" }); return { greeting: `hello ${'$'}{input.name}` }; }, { tenant_id: "kye:tenant:my-tenant", actor: "kye:agent:my-tenant:hello", principal: "kye:org:my-tenant", gateway: "https://gateway.kyeprotocol.com", }, ); // Every invocation auto-emits the §0.3 governance event family. // Regulators can replay any decision with the publisher’s JWKS alone.

What’s open vs. paid

Layer	Open (Apache 2.0)	Paid (commercial SKUs)
Contract	276 schemas, OpenAPI, 23 rule packs, 17 sector packs, 17 dictionaries, 133 conformance fixtures	—
Client SDKs	TypeScript, Python, Go (open under Apache 2.0)	—
Runtime	Reference Gateway (illustrative) on GitHub	KYE Reference Gateway™ commercial release (hardened, SLA-backed) — `KYE-ADDON-GW-PRO-001`
Pack: Data Governance	Schemas + rule packs + dictionaries Apache 2.0	Decision-runtime & DSAR-agent assembly — `KYE-DGP-001` · £150k/year
Pack: Agent Dev Kit	`@kye/agent-dev-kit` + `kye-agent-dev-kit` open on npm/pypi	Priority support, private templates, design-partner office hours — `KYE-ADK-001` · £75k/year

Layer

Open (Apache 2.0)

Paid (commercial SKUs)

Contract

276 schemas, OpenAPI, 23 rule packs, 17 sector packs, 17 dictionaries, 133 conformance fixtures

—

Client SDKs

TypeScript, Python, Go (open under Apache 2.0)

—

Runtime

Reference Gateway (illustrative) on GitHub

KYE Reference Gateway™ commercial release (hardened, SLA-backed) — KYE-ADDON-GW-PRO-001

Pack: Data Governance

Schemas + rule packs + dictionaries Apache 2.0

Decision-runtime & DSAR-agent assembly — KYE-DGP-001 · £150k/year

Pack: Agent Dev Kit

@kye/agent-dev-kit + kye-agent-dev-kit open on npm/pypi

Priority support, private templates, design-partner office hours — KYE-ADK-001 · £75k/year

Every decision the protocol stands for produces signed evidence that a regulator, court, auditor, or dispute panel can replay offline using only the publisher’s JWKS. No vendor cooperation required.