import type { Message } from '../types/message/index.js';
/**
 * Provider-neutral prompt estimate shared by triggers, retention and eviction.
 *
 * Text and tool inputs use the existing characters-per-token approximation.
 * Images and documents have an explicit allowance independent of compression
 * and of whether the bytes are inline or stored externally. Without dimensions,
 * page counts and a provider tokenizer their exact cost is unknown. In
 * particular, serialized base64 is never treated as model-visible prose.
 */
export declare function estimateMessageTokens(message: Message): number;
export declare function estimateMessagesTokens(messages: readonly Message[]): number;
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