/**
 * Threshold Ratchet — selects the DKG signing threshold `t` for a given
 * number of online operators `n`.
 *
 * MUST stay in lock-step with `agent-node/src/threshold.rs::select_threshold`.
 * If you change one without changing the other, agent and SDK will disagree
 * on whether a /dkg/initiate request is valid.
 *
 * ## Why a ratchet?
 *
 * The original whitepaper assumed a 16-of-24 steady-state. Phase 2 onboards
 * only ~10 operators, so a hard-coded 16 default would be unsignable. The
 * ratchet adapts `t` to the live cohort size while never dropping below
 * the Byzantine bound `⌈2n/3⌉`.
 *
 * | Operators online (`n`) | Threshold (`t`) |
 * |------------------------|-----------------|
 * |   <  3                 | reject          |
 * |   3 .. 5               | ⌈2n/3⌉ (2..4)   |
 * |   6 .. 8               | 6               |
 * |   9 .. 10              | 7               |
 * |  11 .. 12              | 8               |
 * |  13 .. 15              | 10              |
 * |  16 .. 18              | 12              |
 * |  19 .. 21              | 14              |
 * |  ≥ 22                  | 16              |
 *
 * The ratchet is **monotonic**: as `n` grows, `t` only grows. Resharing
 * from a smaller cohort to a larger one is always a security upgrade,
 * never a downgrade.
 *
 * See `validation-reports/prod/B5-threshold-decision.md` for the full
 * decision rationale and security analysis.
 */
/**
 * Returns the recommended signing threshold `t` for a network of `n`
 * operators, or `null` for `n < 3` (no useful threshold below 3).
 *
 * Monotonic in `n` and always yields `t >= ⌈2n/3⌉`.
 */
export declare function selectThreshold(nOperators: number): number | null;
/**
 * Validates a user-supplied `(n, t)` pair against the ratchet floor.
 * Returns `null` when accepted, or the minimum required threshold when
 * `t` is below the floor.
 *
 * Named `validateRatchet` (not `validateThreshold`) to avoid collision
 * with the existing struct-shape validator in `./validation.ts`.
 */
export declare function validateRatchet(nOperators: number, t: number): number | null;
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