/**
 * Web chat media uploads — same on-disk convention as IM adapters so
 * agents can Read `[图片附件：…]` / `[文件附件：…]` markers.
 *
 * Files land under `~/.agim/media/web/<safeThreadId>/`.
 */
export declare const WEB_MEDIA_MAX_BYTES: number;
export declare function getWebMediaRoot(): string;
export interface SavedWebMedia {
    path: string;
    bytes: number;
    mime: string;
    name: string;
    kind: 'image' | 'file';
}
export declare function saveWebChatMedia(opts: {
    threadId: string;
    filename: string;
    mime: string;
    body: Buffer;
}): Promise<SavedWebMedia>;
export declare function formatMediaMarker(saved: SavedWebMedia): string;
export declare function resolveSafeWebMediaPath(requested: string): string | null;
/** Guess a Content-Type from filename when the on-disk mime is unknown. */
export declare function guessMediaContentType(filename: string): string;
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