/**
 * cost — shared cost-accounting helper emitted by LLMCall + Agent.
 *
 * Pattern: Strategy (PricingTable port) + Event emission (typedEmit).
 * Role:    core/ layer. When a runner is configured with a PricingTable,
 *          every LLM response drives a `cost.tick` event carrying per-call
 *          tokens/USD plus cumulative run totals. When a `costBudget` is
 *          also set, the first crossing emits `cost.limit_hit` with
 *          `action: 'warn'` (library never auto-aborts; consumers decide).
 * Emits:   agentfootprint.cost.tick
 *          agentfootprint.cost.limit_hit
 */
import type { PricingTable } from '../provider-contract/types.js';
export interface CostAccountingScope {
    cumTokensInput: number;
    cumTokensOutput: number;
    cumEstimatedUsd: number;
    costBudgetHit: boolean;
}
/**
 * What a `costBudget` accepts, and what it does when crossed (8.14.0).
 *
 * A bare `number` is `{ usd, onExceed: 'warn' }` — byte-for-byte what every
 * release before 8.14.0 did — so no existing agent changes behaviour.
 */
export type CostBudget = number | {
    readonly usd: number;
    readonly onExceed: 'warn' | 'halt';
};
/** Normalized form. */
export interface ResolvedCostBudget {
    readonly usd: number;
    readonly onExceed: 'warn' | 'halt';
}
/**
 * Normalize a `costBudget`, refusing a shape that cannot mean anything.
 *
 * `'halt'` is refused for `LLMCall`: halting means "stop at the next iteration
 * boundary", and one call has no next boundary. Accepting it there would give
 * a consumer a stop button wired to nothing — the same silent no-op
 * {@link assertCostBudgetHasPricing} exists to remove.
 *
 * @param runner the class name for the message — `'Agent'` or `'LLMCall'`.
 */
export declare function resolveCostBudget(runner: 'Agent' | 'LLMCall', costBudget: CostBudget | undefined): ResolvedCostBudget | undefined;
/**
 * Refuse a `costBudget` with no `pricingTable` to measure it against (8.13.0).
 *
 * The budget is denominated in USD and {@link emitCostTick} returns on its first
 * line when there is no pricing table, so before this refusal the pair emitted
 * NOTHING — no `cost.tick`, and no `cost.limit_hit` however much a run spent. A
 * budget that cannot be crossed is not a lenient budget; it is a guard rail that
 * was never installed, and it looks identical from the outside to one that
 * simply has not been hit yet.
 *
 * Shared by BOTH runners that take the pair. Leaving the sibling class with the
 * same silent no-op would be a governance fix that itself drops half the cases.
 *
 * @param runner the class name for the message — `'Agent'` or `'LLMCall'`.
 */
export declare function assertCostBudgetHasPricing(runner: 'Agent' | 'LLMCall', pricingTable: PricingTable | undefined, costBudget: CostBudget | undefined): void;
type Usage = {
    readonly input: number;
    readonly output: number;
    readonly cacheRead?: number;
    readonly cacheWrite?: number;
};
/**
 * Who billed this call, and for what.
 *
 * One argument rather than two so the pair cannot drift: a caller that knows
 * the model always has the slot for the provider in front of it, and the one
 * caller that genuinely cannot name a provider (a window strategy that reports
 * `spend` without declaring `billing`) omits it deliberately instead of by
 * forgetting a parameter.
 */
type BilledBy = {
    /** `LLMProvider.name`. Omitted only where the caller genuinely cannot know it. */
    readonly provider?: string;
    /** The model id `pricePerToken` is asked about. */
    readonly model: string;
};
/**
 * Emit `cost.tick` for the just-completed LLM response and, if the
 * consumer set a `costBudget`, emit a one-shot `cost.limit_hit` the first
 * time cumulative USD crosses the budget. Does nothing when no
 * `pricingTable` is configured — zero overhead on runs without costing.
 *
 * Scope must carry the running cumulative counters; callers seed them
 * in their Seed stage.
 */
export declare function emitCostTick(scope: CostAccountingScope & {
    $emit: (name: string, payload?: unknown) => void;
}, pricingTable: PricingTable | undefined, costBudget: ResolvedCostBudget | undefined, billedBy: BilledBy, usage: Usage): void;
export {};