/**
 * Typed errors for the handoff state machine.
 *
 * See session-hierarchy.md §5.1 (illegal `active → locked` transition) and
 * §6.4 (concurrent CAS). Both classes carry structured `details` so consumers
 * can route without string parsing (Convention #5: deny-by-default, fail
 * fast).
 */
import type { SessionId, TurnId } from '../../types/ids/index.js';
/**
 * Raised when a handoff's CAS write finds {@link Session.ownerVersion} has
 * advanced since the assignment was constructed — another actor committed
 * first (session-hierarchy.md §6.4 concurrent CAS). The caller re-reads and
 * decides whether to retry.
 */
export declare class HandoffVersionConflict extends Error {
    readonly details: {
        sessionId: SessionId;
        expected: number;
        actual: number;
    };
    constructor(details: {
        sessionId: SessionId;
        expected: number;
        actual: number;
    });
}
/**
 * Reasons a session cannot transition `* → locked` for handoff. See
 * session-hierarchy.md §5.1 — lock entry requires an `idle` session with all
 * turns terminal. The three reasons are the non-terminal turn statuses that
 * fan in to a non-idle Session.
 */
export type HandoffLockRejectedReason = 'active_turn' | 'pending_hitl' | 'pending_subsession';
/**
 * Raised when a handoff targets a session whose current turn is non-terminal.
 * Callers must wait for the active turn to terminalize (or cancel it) before
 * re-attempting the handoff (session-hierarchy.md §5.1).
 */
export declare class HandoffLockRejected extends Error {
    readonly details: {
        sessionId: SessionId;
        reason: HandoffLockRejectedReason;
        turnId?: TurnId;
    };
    constructor(details: {
        sessionId: SessionId;
        reason: HandoffLockRejectedReason;
        turnId?: TurnId;
    });
}
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