export interface TokenUsageRecord {
    agent: "generator" | "researcher-phase2" | "curator" | "architect";
    runId: string;
    timestamp: string;
    inputTokens: number;
    outputTokens: number;
    graphEnabled: boolean;
}
/**
 * Append-only writer for .bober/graph/token-usage.jsonl.
 *
 * Each call writes ONE line (one JSON object) per agent run.
 * A metrics-write failure must not break the agent — callers should
 * wrap calls in try/catch and swallow errors.
 */
export declare class TokenUsageLog {
    private readonly path;
    constructor(projectRoot: string);
    append(r: TokenUsageRecord): Promise<void>;
}
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