export type SessionInboxDelivery = 'steer' | 'queue';
export interface SessionInboxEntry {
    readonly id: string;
    readonly prompt: string;
    readonly delivery: SessionInboxDelivery;
    readonly admittedSeq: number;
    promotedSeq?: number;
    readonly metadata?: Readonly<Record<string, unknown>>;
}
export interface SessionInboxAdmitInput {
    readonly id?: string;
    readonly prompt: string;
    readonly delivery?: SessionInboxDelivery;
    readonly metadata?: Readonly<Record<string, unknown>>;
}
export declare class SessionInboxConflictError extends Error {
    readonly entryId: string;
    constructor(entryId: string);
}
export declare class SessionInbox {
    private readonly entries;
    private admittedCounter;
    private promotedCounter;
    static readonly MAX_ENTRIES = 500;
    admit(input: SessionInboxAdmitInput): SessionInboxEntry;
    pending(): readonly SessionInboxEntry[];
    promotableSteers(): readonly SessionInboxEntry[];
    nextQueued(): SessionInboxEntry | undefined;
    promote(id: string): SessionInboxEntry;
    hasPendingWork(): boolean;
    private pruneIfNeeded;
    toEntries(): SessionInboxEntry[];
    static fromEntries(entries: readonly SessionInboxEntry[]): SessionInbox;
}
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