/**
 * The fail-fast RECORD and the one error it becomes.
 *
 * The reliability loop (`core/agent/stages/reliabilityExecution.ts · failFast`)
 * ends a run by writing this record and breaking. Whoever owns the run's
 * outcome turns it into `ReliabilityFailFastError`: the agent's own run
 * boundary (`Agent · finalizeResult`), or a composition the agent runs inside
 * (`core-flow/childFailFast.ts`). Every chart boundary between the two carries
 * the record across — a record left behind a boundary is a run that ends
 * "successfully" with no answer.
 */
import type { AgentState } from '../core/agent/types.js';
import { ReliabilityFailFastError } from './types.js';
/** The keys of the record, listed once and checked against `AgentState`. */
export declare const RELIABILITY_FAIL_KEYS: readonly ["reliabilityFailKind", "reliabilityFailPayload", "reliabilityFailReason", "reliabilityFailCauseMessage", "reliabilityFailCauseName"];
/** The fail-fast record as a state holds it. */
export type ReliabilityFailRecord = Pick<AgentState, (typeof RELIABILITY_FAIL_KEYS)[number]>;
/**
 * The fail-fast record a state holds: its present keys, or nothing when no
 * fail-fast fired — so a boundary that spreads it crosses no new key otherwise.
 */
export declare function failFastRecordOf(state: Readonly<Record<string, unknown>>): ReliabilityFailRecord | undefined;
/**
 * The error a fail-fast record becomes. The cause is rebuilt from the message
 * and name the record keeps — an `Error` does not survive the state's
 * `structuredClone`, so the record never held the original.
 */
export declare function failFastErrorOf(record: ReliabilityFailRecord, snapshot?: unknown): ReliabilityFailFastError;