/**
 * include_visual for data tools whose endpoint can embed a rendered picture
 * (+2 credits). formatToolResponse turns the returned `visual` into an image
 * block next to the JSON. Kept to one terse flag: tool text is re-sent to the
 * model on every pass (see tool-surface-budget.test.ts).
 */
/** Input-schema property; `what` names the picture, e.g. "the relocated wheel". */
export declare function visualProperties(what: string): {
    readonly include_visual: {
        readonly type: "boolean";
        readonly description: `Also return ${string} as an image (+2 credits).`;
    };
};
/** Copies the visual request onto the API body. Always SVG: the MCP host rasterizes nothing. */
export declare function applyVisual(body: Record<string, unknown>, args: any): void;