export type CompactionDecisionMode = "none" | "request_time" | "after_turn";
export type CompactionDecisionSource = "automatic" | "explicit";
export type CompactionDecisionReason = "explicit" | "disabled" | "in_flight" | "cooldown" | "insufficient_material" | "automatic_trigger" | "no_trigger";
export type CompactionDecisionSignal = "context_ratio" | "absolute_threshold" | "raw_threshold" | "iteration";
export interface CompactionDecisionInput {
    source: CompactionDecisionSource;
    explicitMode?: Exclude<CompactionDecisionMode, "none">;
    /** True while work is actively executing; otherwise compaction runs after the turn. */
    isMidRun: boolean;
    enabled: boolean;
    inFlight?: boolean;
    pending?: boolean;
    cooldownActive?: boolean;
    hasSufficientMaterial: boolean;
    contextRatioReached?: boolean;
    absoluteThresholdReached?: boolean;
    rawThresholdReached?: boolean;
    iterationReached?: boolean;
}
export interface CompactionDecision {
    mode: CompactionDecisionMode;
    reason: CompactionDecisionReason;
    satisfiedSignals: readonly CompactionDecisionSignal[];
}
/**
 * Deterministically selects whether and when compaction should run. Callers
 * provide already-evaluated guards and thresholds so this remains runtime-free.
 */
export declare function decideCompaction(input: CompactionDecisionInput): CompactionDecision;
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