/**
 * Parses the result of a Pi `--mode json` run.
 *
 * Pi emits a JSONL event stream (one JSON object per line): `session`,
 * `agent_start`, `message_start`, `message_update`, `message_end`, `turn_*`,
 * and finally `agent_end`. The `agent_end` event carries the full `messages`
 * array. We read the result from there — the last assistant message — and
 * ignore the streaming noise.
 *
 * This module is pure (no I/O) so it is unit-tested directly.
 */
export interface PiUsage {
    totalTokens: number;
    cost: number;
}
export interface PiResult {
    text: string;
    stopReason: string | undefined;
    usage: PiUsage;
}
/**
 * Parses a Pi JSONL event stream into a structured result.
 *
 * @throws if the stream contains no `agent_end` event (the run did not
 *   complete — a stuck or killed worker).
 */
export declare function parsePiResult(jsonl: string): PiResult;