import { type Message } from '../core/session/session-jsonl.js';
export type ContextPruningToolMatch = {
    allow?: string[];
    deny?: string[];
};
export type ContextPruningSettings = {
    maxHistoryShare: number;
    keepLastAssistants: number;
    softTrimRatio: number;
    hardClearRatio: number;
    minPrunableToolChars: number;
    softTrim: {
        maxChars: number;
        headChars: number;
        tailChars: number;
    };
    hardClear: {
        enabled: boolean;
        placeholder: string;
    };
    tools: ContextPruningToolMatch;
};
export declare const DEFAULT_CONTEXT_PRUNING_SETTINGS: ContextPruningSettings;
export type PruneResult = {
    messages: Message[];
    droppedMessages: Message[];
    trimmedToolResults: number;
    hardClearedToolResults: number;
    totalChars: number;
    keptChars: number;
    droppedChars: number;
    budgetChars: number;
};
export declare function resolvePruningSettings(raw?: Partial<ContextPruningSettings>): ContextPruningSettings;
export declare function expandKeptWithToolRoundtrips(messages: Message[], kept: Message[]): Message[];
export declare function pruneContextMessages(params: {
    messages: Message[];
    contextWindowTokens: number;
    systemPromptTokens?: number;
    charsPerTokenUnit?: number;
    includeThinking?: boolean;
    settings?: Partial<ContextPruningSettings>;
}): PruneResult;
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