/**
 * AgentMessage compaction — ADR 0010 D1 (pi coding-agent aligned).
 */
import type { AgentMessage } from '../llm/types/agent-message.js';
import type { Model } from '../llm/types/model.js';
export interface AgentCompactionConfig {
    enabled?: boolean;
    auto?: boolean;
    keepRecentTokens?: number;
    minKeepCount?: number;
    contextWindow?: number;
}
export interface AgentCompactionState {
    consecutiveFailures: number;
}
export interface AgentCompactResult {
    wasCompacted: boolean;
    messages: AgentMessage[];
    savedTokens: number;
    microSavedTokens: number;
    autoSavedTokens: number;
    summary?: string;
}
export declare function createAgentCompactionState(): AgentCompactionState;
export declare function isContextOverflowError(err: unknown): boolean;
export declare function summaryAsAgentUserMessage(summary: string, createdAt?: number): AgentMessage;
export declare function shouldAutoCompactAgentMessages(messages: AgentMessage[], contextWindow: number, state?: AgentCompactionState): boolean;
export declare function compactAgentMessages(params: {
    model: Model;
    messages: AgentMessage[];
    contextWindow?: number;
    keepRecentTokens?: number;
    minKeepCount?: number;
    customInstructions?: string;
}): Promise<{
    summary: string;
    keptMessages: AgentMessage[];
    compactedCount: number;
    savedTokens: number;
}>;
export declare function autoCompactAgentMessagesIfNeeded(params: {
    model: Model;
    messages: AgentMessage[];
    config?: AgentCompactionConfig;
    state?: AgentCompactionState;
    force?: boolean;
    customInstructions?: string;
}): Promise<AgentCompactResult>;
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