/**
 * The check that exists because of C-11 (FR-50).
 *
 * Pi reads six numbers of an assistant message's `usage` object without a guard —
 * `usage.input`, `usage.output`, `usage.cacheRead`, `usage.cacheWrite`,
 * `usage.totalTokens` and `usage.cost.total`. A missing `usage` stops Pi with
 * `TypeError: Cannot read properties of undefined (reading 'input')`, and it happens
 * after the file is already in the user's home. So the check runs before placement,
 * on the bytes, on every message, and it reports every defect it finds.
 *
 * Zero is a valid value. `Number.isFinite` is the test, never truthiness.
 */
import type { SerializedSession, ValidationDefect } from "./contract.js";
export declare function validateSerialized(serialized: SerializedSession): ValidationDefect[];