/**
 * Trace Diff — Compare two traces to detect behavioral drift.
 */
import type { AgentTrace } from './types';
export interface TraceDiff {
    stepsOld: number;
    stepsNew: number;
    stepsDelta: number;
    tokensOld: {
        input: number;
        output: number;
    };
    tokensNew: {
        input: number;
        output: number;
    };
    tokensDeltaPercent: number;
    toolsOld: string[];
    toolsNew: string[];
    toolsAdded: string[];
    toolsRemoved: string[];
    outputOld: string;
    outputNew: string;
    outputChanged: boolean;
    warnings: string[];
}
/**
 * Compare two traces and return structured diff.
 */
export declare function diffTraces(oldTrace: AgentTrace, newTrace: AgentTrace): TraceDiff;
/**
 * Format a trace diff for terminal display.
 */
export declare function formatDiff(diff: TraceDiff): string;
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