import type { AgentMessage } from "@mariozechner/pi-agent-core";
import type { PreemptiveCompactionRoute } from "./preemptive-compaction.types.js";
export declare const PREEMPTIVE_OVERFLOW_ERROR_TEXT = "Context overflow: prompt too large for the model (precheck).";
export type { PreemptiveCompactionRoute } from "./preemptive-compaction.types.js";
export declare function estimatePrePromptTokens(params: {
    messages: AgentMessage[];
    systemPrompt?: string;
    prompt: string;
}): number;
export declare function shouldPreemptivelyCompactBeforePrompt(params: {
    messages: AgentMessage[];
    unwindowedMessages?: AgentMessage[];
    systemPrompt?: string;
    prompt: string;
    contextTokenBudget: number;
    reserveTokens: number;
    toolResultMaxChars?: number;
}): {
    route: PreemptiveCompactionRoute;
    shouldCompact: boolean;
    estimatedPromptTokens: number;
    promptBudgetBeforeReserve: number;
    overflowTokens: number;
    toolResultReducibleChars: number;
    effectiveReserveTokens: number;
};