/**
 * Step checkpoint model — ADR 0040 P3 (HTTP session scope).
 */
export declare const AgentStepStatus: {
    readonly RUNNING: "running";
    readonly COMPLETED: "completed";
    readonly INTERRUPTED: "interrupted";
};
export type AgentStepStatusName = (typeof AgentStepStatus)[keyof typeof AgentStepStatus];
export type AgentStepInterruptKind = 'approval' | 'authorization' | 'unknown';
export interface AgentStepCheckpoint {
    stepId: string;
    turnId?: string;
    status: AgentStepStatusName;
    startedAt: number;
    completedAt?: number;
    interruptKind?: AgentStepInterruptKind;
    requestId?: string;
}
export declare function createStepId(): string;
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