import type { McpToolName } from "../contracts/output-schemas.js";
import { type BurdenByKind } from "./burden.js";
export declare class MetricsSnapshot {
    readonly reads: number;
    readonly outlines: number;
    readonly refusals: number;
    readonly cacheHits: number;
    readonly bytesReturned: number;
    readonly bytesAvoided: number;
    readonly burdenByKind: Readonly<BurdenByKind>;
    constructor(fields: {
        readonly reads: number;
        readonly outlines: number;
        readonly refusals: number;
        readonly cacheHits: number;
        readonly bytesReturned: number;
        readonly bytesAvoided: number;
        readonly burdenByKind: Readonly<BurdenByKind>;
    });
}
export declare class MetricsDelta {
    readonly reads: number;
    readonly outlines: number;
    readonly refusals: number;
    readonly cacheHits: number;
    readonly bytesReturned: number;
    readonly bytesAvoided: number;
    readonly burdenByKind: Readonly<BurdenByKind>;
    constructor(fields: {
        readonly reads: number;
        readonly outlines: number;
        readonly refusals: number;
        readonly cacheHits: number;
        readonly bytesReturned: number;
        readonly bytesAvoided: number;
        readonly burdenByKind: Readonly<BurdenByKind>;
    });
}
export declare class Metrics {
    private totalReads;
    private totalOutlines;
    private totalRefusals;
    private totalCacheHits;
    private totalBytesAvoidedByCache;
    private cumulativeBytesReturned;
    private burdenByKind;
    static fromSnapshot(snapshot: MetricsSnapshot): Metrics;
    recordRead(): void;
    recordOutline(): void;
    recordRefusal(): void;
    recordCacheHit(bytesAvoided: number): void;
    recordToolResult(tool: McpToolName, n: number): void;
    applyDelta(delta: MetricsDelta): void;
    snapshot(): MetricsSnapshot;
}
export declare function diffMetrics(before: MetricsSnapshot, after: MetricsSnapshot): MetricsDelta;
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