/**
 * Some surfaces are framed by a host and carry no agent-native session at all —
 * Builder's Design tab frames a canvas that owns no design row and holds no
 * credential. Every `/_agent-native/*` call from one is unauthenticated by
 * construction, so the client must not make them: a 401 per poll buries real
 * failures, and a write can never land.
 */
export declare function setAgentNativeApiDisabled(reason: string | null): void;
export declare function agentNativeApiDisabledReason(): string | null;
export declare class AgentNativeApiDisabledError extends Error {
    readonly reason: string;
    constructor(detail: string);
}
export declare function assertAgentNativeApiEnabled(detail: string): void;