import type { TaskType } from '@zhixuan92/multi-model-agent-core';
/** Extract the last ```json fenced block (or first bare JSON object) from raw
 *  LLM output; falls back to the raw string when nothing parses. */
export declare function tryParseJson(raw: string): unknown;
/**
 * Build a terminal FAILED result that is shape-consistent with the success/pipeline
 * envelope (execution, output, metrics, raw, error). Every terminal 200 — success or
 * failure — must have these five top-level keys so callers detect failure uniformly via
 * `error` (the contract documented in _shared/response-shape.md). Used for pre-dispatch/
 * async validation failures and runner crashes, which would otherwise store a bare
 * { code, message } that has no `error` field for callers to check.
 */
export declare function buildErrorEnvelope(executionId: string, type: TaskType, error: {
    code: string;
    message: string;
} & Record<string, unknown>, status?: 'failed' | 'cancelled' | 'interrupted', method?: string | null): Record<string, unknown>;
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