export interface RuntimeContextOptions {
    now?: Date;
    timezone?: string | null;
    delegationDepth?: number;
}
export declare const MAX_SUBAGENT_DELEGATION_DEPTH = 2;
export declare const MAX_SUBAGENT_DELEGATION_DEPTH_ENV = "AGENT_NATIVE_MAX_SUBAGENT_DEPTH";
export declare function resolveMaxSubagentDelegationDepth(env?: Record<string, string | undefined>): number;
export declare function isValidTimezone(timezone: string): boolean;
export declare function formatDateTime(date: Date, timezone: string): string;
export declare function formatDate(date: Date, timezone: string): string;
export declare function buildRuntimeContextPrompt(options?: RuntimeContextOptions): string;
export interface CurrentTimeContextOptions {
    now?: Date;
    timezone?: string | null;
}
export declare function buildCurrentTimeUserContext(options?: CurrentTimeContextOptions): string;