/** Web chat: max files per user message (keep in sync with `web` MAX_CHAT_ATTACHMENTS). */
export declare const MAX_CHAT_ATTACHMENTS = 10;
/** Inline chat text stays bounded; larger content belongs in an attachment. */
export declare const MAX_CHAT_INLINE_TEXT_BYTES: number;
/**
 * Max raw bytes per attachment in web chat (keep in sync with `web` MAX_WEBCHAT_ATTACHMENT_FILE_BYTES).
 * JSON requests send base64 (`data`); gateway body limit must allow worst-case payload.
 */
export declare const MAX_WEBCHAT_ATTACHMENT_FILE_BYTES: number;
export declare function validateWebchatAttachments(attachments: unknown[] | undefined): string | null;
export declare function validateWebchatContent(content: unknown): string | null;
/** Upper bound for a session input request when every attachment is encoded as base64. */
export declare function maxSessionInputRequestBodyBytes(): number;