/**
 * Cast screenshot command — captures a per-eye/stereo VR frame via the
 * daemon's casting API, validates the bytes, and writes it to disk.
 *
 * Atomic workflow in one invocation:
 *   1. Ensure the daemon is running.
 *   2. POST /cast/start (idempotent).
 *   3. POST /cast/eye   (set eye mode).
 *   4. GET  /cast/screenshot  (raw JPEG bytes).
 *   5. Validate JPEG magic bytes (SOI + EOI); refuse non-images.
 *   6. Write to the output directory; add caption metadata if provided.
 *   7. Print the absolute path on stdout.
 *
 * Why this exists: callers who hand-roll `curl -o foo.jpg` against the
 * daemon risk saving a JSON error body with a `.jpg` extension. Downstream
 * consumers that mime-sniff by extension (e.g. Claude Code's Read tool) will
 * crash on such a file. This command guarantees the file it prints is a
 * real JPEG.
 */
export type CastEyeMode = "left" | "right" | "stereo";
export interface CastScreenshotOptions {
    mode: CastEyeMode;
    directory: string;
    caption?: string;
    port?: number;
    device?: string;
    host?: string;
}
export declare function castScreenshotCommand(opts: CastScreenshotOptions): Promise<void>;
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