/**
 * G9.3 — forced compression gate threshold constants + tier evaluation.
 *
 * 256K default context capacity is a conservative proxy. The LLM's real
 * capacity is its private business (R-1 / R-8 / R-10 / R-13 boundary
 * inherited from slice #009); we use prompt size as the gate signal.
 */
export declare const CONTEXT_CAPACITY_DEFAULT_BYTES: number;
export declare const THRESHOLD_SOFT_WARN_RATIO = 0.5;
export declare const THRESHOLD_NEAR_LIMIT_RATIO = 0.75;
export declare const THRESHOLD_HARD_REJECT_RATIO = 0.8;
export declare const THRESHOLD_EMERGENCY_RATIO = 0.9;
export type ThresholdTier = 'ok' | 'soft-warn' | 'near-limit' | 'hard-reject' | 'emergency';
export interface ThresholdEvaluation {
    readonly tier: ThresholdTier;
    readonly ratio: number;
    readonly bytesUsed: number;
    readonly capacityBytes: number;
    readonly warnings: readonly string[];
}
/**
 * Compute the threshold tier for a given prompt size. Pure function
 * (no IO, no side effects). The `capacityBytes` parameter lets callers
 * override the default 256K proxy (e.g. for testing or for a future
 * per-IDE capacity override).
 */
export declare function evaluateThresholdTier(promptSize: number, capacityBytes?: number): ThresholdEvaluation;
/**
 * Convert a threshold tier to a machine-readable code suitable for the
 * CLI envelope's `code` field. Used by both the CLI and the hook layer.
 */
export declare function tierToCode(tier: ThresholdTier): string;