import type { MossAgentEvent } from '../core/index.js';
export interface ContextUsageSnapshot {
    used: number;
    total: number;
    source: 'provider' | 'estimated';
    inputTokens?: number;
    cacheReadTokens?: number;
    cacheCreationTokens?: number;
}
export declare function contextUsageFromAgentEvent(event: MossAgentEvent): ContextUsageSnapshot | null;
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