/**
 * In-memory (optionally persisted) record of generations performed this
 * session. Powers the QoL tools usage_summary and list_recent_generations,
 * and surfaces the last-known balance without spending a credit.
 *
 * Persistence is opt-in via MYARCHITECTAI_STATE_FILE; otherwise history lives
 * for the lifetime of the server process (one MCP session).
 */
export interface GenerationRecord {
    id: number;
    tool: string;
    createdAt: string;
    output: string[];
    cost: number;
    balance: number;
}
export interface UsageSummary {
    totalGenerations: number;
    totalCost: number;
    lastKnownBalance: number | null;
    byTool: Record<string, {
        count: number;
        cost: number;
    }>;
    since: string | null;
}
export declare class SessionStore {
    #private;
    constructor(stateFile?: string);
    /** Load persisted history if a state file is configured and present. */
    init(): Promise<void>;
    record(entry: {
        tool: string;
        output: string[];
        cost: number;
        balance: number;
    }): Promise<GenerationRecord>;
    /** Most recent generations first. */
    recent(limit?: number): GenerationRecord[];
    summary(): UsageSummary;
}
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