import { z } from "zod";
import type { AgentTool } from "@kenkaiiii/gg-agent";
declare const OverlayWatermarkParams: z.ZodObject<{
    input: z.ZodString;
    watermark: z.ZodString;
    output: z.ZodString;
    position: z.ZodOptional<z.ZodEnum<{
        center: "center";
        "bottom-left": "bottom-left";
        "bottom-right": "bottom-right";
        "top-left": "top-left";
        "top-right": "top-right";
    }>>;
    marginPx: z.ZodOptional<z.ZodNumber>;
    opacity: z.ZodOptional<z.ZodNumber>;
    scale: z.ZodOptional<z.ZodNumber>;
}, z.core.$strip>;
export declare function createOverlayWatermarkTool(cwd: string): AgentTool<typeof OverlayWatermarkParams>;
/**
 * Build overlay x/y formulas from a named position. ffmpeg's overlay filter
 * supports `W`/`H` (main video) and `w`/`h` (overlay dimensions).
 */
export declare function positionFormula(pos: "top-left" | "top-right" | "bottom-left" | "bottom-right" | "center", margin: number): {
    x: string;
    y: string;
};
export {};
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