/** Record text the koi just SAID (a finalized reply / injected message), so
 *  its mic echo can be recognized and dropped. Cheap; safe to call always. */
export declare function noteKoiSpokenText(text: string, ts?: number): void;
/** True when a mic segment substantially matches something the koi recently
 *  spoke — i.e. the koi hearing its own voice. While TTS is PHYSICALLY
 *  playing (per the speaking-state bus) the bar drops: the mic is known to be
 *  hearing the koi, and STT garbles the TTS round trip badly enough that the
 *  normal threshold misses real echo (the self-wake loop, 2026-07-17). */
export declare function isKoiSelfEcho(text: string, ts?: number): boolean;
/** True when koi's TTS was playing over the speakers at time `ts` (± tail) —
 *  i.e. whatever the mic heard then very likely includes the koi's own voice. */
export declare function isKoiSpeakingWindow(ts?: number): boolean;
/** Test seam. */
export declare function resetSelfEchoForTest(): void;