import type { CapabilityEnvelope, PolicyAction } from './types.js';
export interface EnvelopeCheck {
    allowed: boolean;
    reason?: string;
}
export declare function checkCapabilityEnvelope(action: PolicyAction, envelope: CapabilityEnvelope | undefined, now?: number): EnvelopeCheck;
export declare function isEnvelopeReduction(parent: CapabilityEnvelope, child: CapabilityEnvelope): boolean;
export declare function delegateEnvelope(parent: CapabilityEnvelope, child: CapabilityEnvelope): CapabilityEnvelope;
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