/**
 * The six metric fields every token-usage reporting resource exposes.
 *
 * Declared once and spread into all six descriptors (three administrative,
 * three self-service) so the two surfaces cannot drift apart. Spreading a shared
 * `fields` object is an established pattern in this codebase — a consuming app's
 * ExtendedTokenUsageDescriptor already does `fields: { ...TokenUsageDescriptor.fields }`.
 *
 * The `as const` is per FIELD, not on the whole object: it pins `type` to a
 * string literal (which defineEntity needs to infer the entity shape) while
 * leaving each field object mutable, which a whole-object `as const` would not.
 */
export declare const usageMetricFields: {
    cost: {
        type: "number";
        required: boolean;
    };
    credits: {
        type: "number";
        required: boolean;
    };
    tokensIn: {
        type: "number";
        required: boolean;
    };
    tokensOut: {
        type: "number";
        required: boolean;
    };
    cached: {
        type: "number";
        required: boolean;
    };
    calls: {
        type: "number";
        required: boolean;
    };
};
/** The metric half of every reporting entity type. */
export type UsageMetrics = {
    cost: number;
    credits: number;
    tokensIn: number;
    tokensOut: number;
    cached: number;
    calls: number;
};
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