import type { Decision } from './decision.ts';
import { type EpistemicStage, type TrustBand, type UncertaintyLevel } from './policy.ts';
/** Which band `E[p]` falls into. D5. */
export declare function trustBand(mean: number): TrustBand;
/** Which band `Var[p]` falls into. D5. */
export declare function uncertaintyLevel(variance: number): UncertaintyLevel;
/**
 * Which epistemic stage an evidence mass falls into. D5, revised.
 *
 * `n = alpha + beta`, so a fresh entity is `n = 2`: the prior and nothing else.
 */
export declare function epistemicStage(mass: number, thresholds?: {
    developingAt: number;
    establishedAt: number;
}): EpistemicStage;
export type TrustAssessment = {
    readonly mean: number;
    readonly variance: number;
    /** Evidence mass, `n = alpha + beta`. A fresh entity reads 2. */
    readonly mass: number;
    readonly stage: EpistemicStage;
    readonly band: TrustBand;
    readonly uncertainty: UncertaintyLevel;
    /** What the trust band alone proposed. */
    readonly proposed: Decision;
    /** The binding ceiling, after epistemic stage, uncertainty and anomaly. */
    readonly ceiling: Decision;
    /** The advice: `proposed`, lowered to `ceiling` if it exceeded it. */
    readonly decision: Decision;
    readonly capped: boolean;
    readonly reason: string;
};
export type AssessOptions = {
    /**
     * Whether the anomaly dimension concurs that observed behavior is diverse
     * enough for low variance to be believed. D37.
     *
     * `undefined` means no anomaly data exists yet, which is the current state of
     * the project: not an assertion that behavior is monotonous.
     */
    readonly anomalyConcurs?: boolean | undefined;
    /**
     * Permit a full ceiling on low variance alone, with no anomaly concurrence.
     *
     * Defaults to `false`: uniform, high-volume traffic drives variance down while
     * proving very little, and D37 places the fix here rather than in the trust
     * mathematics.
     */
    readonly allowEscalationWithoutAnomaly?: boolean;
    readonly thresholds?: {
        developingAt: number;
        establishedAt: number;
    };
};
/**
 * Read a trust distribution as advice. D5, with the epistemic stage of the D5
 * revision and the anomaly concurrence of D37.
 *
 * Three ceilings apply and the lowest binds:
 *
 * - epistemic stage: has enough evidence arrived to interpret the mean at all
 * - uncertainty: is the distribution tight enough to act on
 * - anomaly concurrence: is that tightness earned by varied behavior
 *
 * Advisory only; the host decides what to do with the result. D14.
 */
export declare function assessTrust(mean: number, variance: number, mass: number, options?: AssessOptions): TrustAssessment;
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