/**
 * Token health anomaly detection.
 *
 * Pure functions that compare consecutive turn token snapshots
 * and classify abnormal patterns. No I/O, no imports from server.ts.
 */
export interface TokenSnapshot {
    requestId: string;
    turnNumber: number;
    inputTokens: number;
    outputTokens: number;
    cacheReadInputTokens: number;
    cacheCreationInputTokens: number;
    cacheHitRate: number;
    isResume: boolean;
    isPassthrough: boolean;
}
export interface TokenAnomaly {
    type: "context_spike" | "cache_miss" | "output_explosion";
    severity: "warn" | "critical";
    detail: string;
}
/**
 * Compare a current turn's token snapshot against the previous turn.
 * Returns an array of detected anomalies (empty if everything looks normal).
 */
export declare function detectTokenAnomalies(current: TokenSnapshot, previous: TokenSnapshot | undefined): TokenAnomaly[];
/**
 * Format anomalies as stderr log lines.
 */
export declare function formatAnomalyAlerts(requestId: string, anomalies: TokenAnomaly[]): string[];
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