import type { Usage } from "@caupulican/pi-ai";
export interface SpawnedUsageReporter {
    addSpawnedUsage(usage: Usage, options: {
        label?: string;
        sourceSessionId?: string;
        reportId: string;
    }): string | undefined;
}
export type SpawnedUsageIdentity = string | readonly string[];
export interface SpawnedUsageIdentityOptions {
    kind: string;
    label?: string;
    sessionId: string;
    identity: SpawnedUsageIdentity;
}
/** Stable retry identity; chunk arrays hash as their space-joined form without materializing that string. */
export declare function deriveSpawnedUsageReportId(kind: string, sessionId: string, identity: SpawnedUsageIdentity): string;
export declare function hasReportableUsage(usage: Usage): boolean;
/** Gate and record one spawned work unit through the session's idempotent usage ledger. */
export declare function reportSpawnedUsage(reporter: SpawnedUsageReporter, usage: Usage, options: SpawnedUsageIdentityOptions): string | undefined;
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