export type TaskConversationStatus = 'idle' | 'active';
export type TaskSessionRole = 'primary' | 'discussion' | 'execution';
export type TaskSessionStatus = 'active' | 'completed' | 'superseded' | 'failed';
export interface TaskConversationState {
    taskId: string;
    activeSessionKey?: string;
    currentExecutorAgentId?: string;
    assignmentEpoch: number;
    status: TaskConversationStatus;
    updatedAt: number;
}
export interface TaskSessionLink {
    id: string;
    taskId: string;
    sessionKey: string;
    role: TaskSessionRole;
    agentId?: string;
    runId?: string;
    assignmentEpoch: number;
    status: TaskSessionStatus;
    startedAt: number;
    endedAt?: number;
    createdAt: number;
}
export interface TaskHandoffSnapshot {
    id: string;
    taskId: string;
    fromSessionKey?: string;
    toSessionKey: string;
    fromAgentId?: string;
    toAgentId: string;
    assignmentEpoch: number;
    payload: Record<string, unknown>;
    createdAt: number;
}
export declare class TaskConversationConflictError extends Error {
}
export declare class TaskConversationRepository {
    findHandoffByIdempotencyKey(input: {
        taskId: string;
        expectedTaskVersion: number;
        toAgentId: string;
        idempotencyKey: string;
    }): TaskHandoffSnapshot | undefined;
    getState(taskId: string): TaskConversationState | undefined;
    requireState(taskId: string): TaskConversationState;
    listSessions(taskId: string): TaskSessionLink[];
    getActiveSession(taskId: string): TaskSessionLink | undefined;
    resolveActiveExecutionSession(sessionKey: string): TaskSessionLink | undefined;
    activateExecutionSession(input: {
        taskId: string;
        sessionKey: string;
        agentId: string;
        runId?: string;
        now?: number;
    }): TaskConversationState;
    completeHandoff(input: {
        taskId: string;
        expectedTaskVersion: number;
        toSessionKey: string;
        toAgentId: string;
        idempotencyKey: string;
        payload: Record<string, unknown>;
        now?: number;
    }): {
        state: TaskConversationState;
        snapshot: TaskHandoffSnapshot;
        taskVersion: number;
    };
    getLatestHandoff(taskId: string): TaskHandoffSnapshot | undefined;
}