/**
 * Bridges a delegated subagent's terminal outcome back to its parent
 * driver via the subagent-result hook. Pure projection helpers live
 * in `delegated-parent-result.ts` so the workflow step-proxy transform
 * doesn't strip them from this file.
 */
import type { RuntimeSubagentResultActionResult } from "#runtime/actions/types.js";
import type { TokenUsage } from "#shared/token-usage.js";
/**
 * Resumes the parent driver's hook with a delegated subagent result.
 * No-op for root sessions.
 *
 * `usage` — the completed child's session-total token spend — is
 * attached to success results so the caller can attribute the
 * subagent's tokens. Error results never carry usage.
 */
export declare function notifyDelegatedParentStep(input: {
    readonly result: RuntimeSubagentResultActionResult | undefined;
    readonly serializedContext: Record<string, unknown>;
    readonly usage?: TokenUsage;
}): Promise<void>;