import type { AgentMessage } from '../llm/types/agent-message.js';
export declare function estimateAgentMessageTokens(message: AgentMessage): number;
export declare function estimateAgentMessagesTokens(messages: AgentMessage[]): number;
/**
 * Walk from newest messages backward until keepRecentTokens budget is met.
 * Returns index of first kept message (0 = keep all).
 */
export declare function findKeepRecentStartIndex(messages: AgentMessage[], keepRecentTokens: number, minKeepCount?: number): number;
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