export declare const PORTAL_TRANSFER_SCHEMA_VERSION: 1;
export declare const PORTAL_TRANSFER_MAX_CONTEXT_BYTES = 900000;
export type PortalTransferEventKind = "user" | "system" | "note" | "artifact" | "status";
export interface PortalTransferTranscriptEvent {
    schemaVersion: 1;
    id: string;
    kind: PortalTransferEventKind;
    message: string;
    createdAt: string;
    metadata?: Record<string, unknown>;
    signal?: "credential-gap";
}
export interface PortalTransferContext {
    schemaVersion: 1;
    sourceRunId: string;
    sourceStatus?: string;
    sourcePhase?: string;
    events: PortalTransferTranscriptEvent[];
}
export interface PortalTransferSourceEvent {
    id?: unknown;
    runId?: unknown;
    kind?: unknown;
    type?: unknown;
    message?: unknown;
    text?: unknown;
    createdAt?: unknown;
    metadata?: unknown;
    signal?: unknown;
}
export declare function createPortalTransferContext(input: {
    sourceRunId: string;
    sourceStatus?: string;
    sourcePhase?: string;
    events: readonly PortalTransferSourceEvent[];
}): PortalTransferContext;
export declare function parsePortalTransferContext(value: unknown): PortalTransferContext | null;
export declare function appendPortalTransferTranscript(context: PortalTransferContext, runId: string): number;
export declare function portalTransferContinuationPrompt(input: {
    hostLabel: string;
    handoffId: string;
    eventCount: number;
}): string;