@peac/control

PEAC protocol control engine: constraint enforcement, control block validation, and state management.

Installation

pnpm add @peac/control

What It Does

@peac/control provides the Control Abstraction Layer (CAL) for the PEAC protocol. It defines vendor-neutral control engine interfaces, constraint types (temporal, usage, budget), enforcement logic, and state management for tracking receipt usage over time. Control engines evaluate whether a receipt's constraints are satisfied before granting access.

How Do I Use It?

Enforce a temporal constraint

import { enforceTemporalConstraint } from '@peac/control';

const result = enforceTemporalConstraint({
  type: 'temporal',
  valid_from: 1700000000,
  valid_until: 1700086400,
});

console.log(result.allowed); // true or false
console.log(result.remaining?.seconds); // seconds until expiry

Track usage state across multiple interactions

import { createControlState, updateStateAfterUse, isStateExpired } from '@peac/control';

const state = createControlState('receipt-123', {
  type: 'usage',
  max_uses: 10,
});

const updated = updateStateAfterUse(state);
console.log(updated.usage_count); // 1
console.log(isStateExpired(updated)); // false

Register a custom control engine adapter

import { ControlEngineRegistry } from '@peac/control';
import type { ControlEngineAdapter } from '@peac/control';

const myEngine: ControlEngineAdapter = {
  name: 'my-engine',
  evaluate: async (context) => ({
    result: 'allow',
    evidence: { engine: 'my-engine', checked_at: new Date().toISOString() },
  }),
};

const registry = new ControlEngineRegistry();
registry.register(myEngine);

Integrates With

• @peac/schema (Layer 1): Control block and constraint Zod schemas
• @peac/protocol (Layer 3): Receipt issuance with embedded control blocks
• @peac/kernel (Layer 0): Types and constants used by control logic

For Agent Developers

If you are building an AI agent or MCP server that needs evidence receipts:

• Start with @peac/mcp-server for a ready-to-use MCP tool server
• Use @peac/protocol for programmatic receipt issuance and verification
• See the llms.txt for a concise overview

License

Apache-2.0

PEAC Protocol is an open source project stewarded by Originary and community contributors.

Docs | GitHub | Originary