/**
 * Bounded model escalation.
 *
 * Escalation is a separate, bounded decision from a strategy pivot. It moves
 * the same task to a stronger/compatible model for reasons such as a required
 * capability, repeated schema failure, independent review, or a high-risk
 * release gate. Escalation REQUIRES structured evidence and policy permission.
 * A model can recommend escalation but can never authorize it.
 */
import type { EscalationRequest, StallState } from "./types.js";
export type EscalationReasonCode = "capability_mismatch" | "repeated_schema_failure" | "independent_review_required" | "high_risk_release_gate" | "complex_cross_repository_failure" | "stall_after_distinct_strategies";
/** Reasons that are forbidden for escalation. */
export declare const FORBIDDEN_ESCALATION_REASONS: ReadonlyArray<EscalationReasonCode | string>;
export interface EscalationBudget {
    maxModelEscalations: number;
}
export interface EscalationContext {
    usedEscalations: number;
    maxModelEscalations: number;
    policyAllows: boolean;
    remainingBudget: number;
    stall?: StallState;
    failureEvidenceCount: number;
    distinctStrategiesAttempted: number;
    forcedReasons?: string[];
}
export interface EscalationDecision {
    allowed: boolean;
    reasonCodes: string[];
    blockedCodes: string[];
    toProvider?: string;
    toModel?: string;
}
/**
 * Evaluate an escalation request against policy and evidence. An escalation is
 * allowed only if: escalation budget remains, policy permits, allowed reasons
 * are present, and the aliasing of two equivalent models is not requested.
 */
export declare function evaluateEscalation(request: EscalationRequest, ctx: EscalationContext): EscalationDecision;
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