import type { SessionEntryLike } from "./types.js";
export declare const SUBAGENT_USAGE_ENTRY = "subagent-usage-receipt";
export interface SubagentUsageReceipt {
    version: 1;
    sessionId: string;
    goalId: string;
    receiptId: string;
    handle: string;
    childSessionFile: string;
    at: number;
    usage: {
        input: number;
        output: number;
        cacheRead: number;
        cacheWrite: number;
    };
}
export declare function parseSubagentUsageReceipt(data: unknown): SubagentUsageReceipt | null;
export declare function receiptFromEntry(entry: SessionEntryLike): SubagentUsageReceipt | null;
export declare function receiptTokens(receipt: SubagentUsageReceipt): number;
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