export interface StepMetric {
    stepId: string;
    tool: string;
    durationMs: number;
    inputChars: number;
    outputChars: number;
    inputTokensEst: number;
    outputTokensEst: number;
    totalTokensEst: number;
}
export interface DurationSummary {
    count: number;
    minMs: number;
    maxMs: number;
    meanMs: number;
    medianMs: number;
    spreadMs: number;
}
export declare function estimateTokens(text: string): number;
export declare function summarizeDurations(values: number[]): DurationSummary;