import type { LanguageModel, ProviderMetadata } from "ai";
import type { HarnessStepResult } from "#harness/step-hooks.js";
import { type TokenUsageDelta } from "#harness/turn-tag-state.js";
import type { Step } from "#harness/step/context.js";
/**
 * The model's gateway id, or `undefined` for a model without a string `provider`, such as a
 * test double, so a missing field never throws into the tool loop.
 */
export declare function gatewayModelId(model: LanguageModel): string | undefined;
export declare function extractTokenUsageDelta(input: {
    readonly costUsd: number | undefined;
    readonly usage: HarnessStepResult["usage"] | undefined;
}): TokenUsageDelta | undefined;
export declare function extractGatewayCostUsd(providerMetadata: ProviderMetadata | undefined): number | undefined;
/**
 * Tags the turn's workflow run with the model and the turn's running token totals. Each model
 * step is its own workflow step and attributes are last-write-wins, so the running total, kept in
 * session state, is what reaches the dashboard. Best-effort: tagging never breaks the loop.
 */
export declare function recordModelUsage(step: Step, input: {
    readonly model: LanguageModel;
    readonly result: HarnessStepResult;
}): Promise<void>;