/**
 * Structured-output parsing for harnesses that emit JSON / NDJSON
 * (antigravity `--output-format json`, claude `stream-json`, gemini json, ...).
 *
 * The reply loops call parseHarnessOutput() on the raw stdout and get back the
 * plain-text reply. Defensive by design: when nothing structured is found the
 * raw text is returned unchanged, so plain-text harnesses (opencode, codex
 * exec) are never touched.
 *
 * formatHarnessEvent() is the live-streaming counterpart: it converts a single
 * NDJSON event line into a human-readable transcript line for the console/tee.
 */
/**
 * Parse a harness NDJSON event line into a human-readable transcript line.
 * Returns null when the line is not a recognized JSON event (falls through
 * to raw logging for plain-text harnesses or non-JSON lines).
 *
 * Supports: opencode, claude, cursor, gemini/antigravity, goose, copilot,
 * openhands — all harnesses that emit `--output-format json` or `--format json`.
 */
export declare function formatHarnessEvent(raw: string): string | null;
/**
 * Best-effort extraction of the plain-text reply from structured stdout.
 * Returns null when nothing structured was found (caller keeps raw text).
 */
export declare function tryExtractStructuredReply(raw: string): string | null;
/**
 * Extract the plain-text reply for a harness. `structured` mirrors the
 * adapter's `structuredOutput` flag; plain-text harnesses pass through.
 */
export declare function parseHarnessOutput(structured: boolean, raw: string): string;