/**
 * Runtime context data supplied to a {@link CompactionStrategy}
 * when deciding whether to compact the context window.
 *
 * @docLink packages/runner/dev-guide#compaction
 */
export interface CompactionContext {
    estimatedTokens: number;
    contextWindow: number;
    messageCount: number;
    lastCompactionSeq: number | null;
    timeSinceLastCompaction: number | null;
}
/**
 * Strategy for deciding when the context window should be compacted.
 *
 * Implementations receive the current {@link CompactionContext} and
 * return true when compaction should proceed.
 *
 * @docLink packages/runner/dev-guide#compaction
 */
export interface CompactionStrategy {
    shouldCompact(context: CompactionContext): boolean;
}
/**
 * Compaction strategy that triggers when estimated token usage
 * exceeds a percentage of the context window. A cooldown period
 * prevents thrashing.
 *
 * @docLink packages/runner/dev-guide#compaction
 */
export declare class TokenThresholdStrategy implements CompactionStrategy {
    private readonly thresholdPercent;
    private readonly minCooldownMs;
    constructor(opts: {
        thresholdPercent: number;
        minCooldownMs: number;
    });
    shouldCompact(context: CompactionContext): boolean;
}
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