/**
 * [WHO]: estimateInputTokens(), checkPerCallBudget(), BudgetVerdict
 * [FROM]: Depends on ./recap-types for RecapSettings
 * [TO]: Consumed by extensions/builtin/recap/recap-synthesizer.ts
 * [HERE]: extensions/builtin/recap/recap-budget.ts - pre-call budget enforcement (M1: per-call only; session/daily defer to M3)
 */
import type { RecapSettings } from "./recap-types.js";
/**
 * Rough token estimate from string length. 4 chars per token is the
 * conservative end of the typical 3–4 ratio across English + code. M1 uses
 * this only as a pre-flight check; post-call accounting always uses the
 * provider's real `usage.input` count from completeSimpleWithUsage.
 */
export declare function estimateInputTokens(systemPrompt: string, userMessage: string): number;
export type BudgetVerdict = {
    allowed: true;
    estimatedInputTokens: number;
} | {
    allowed: false;
    reason: string;
    estimatedInputTokens: number;
};
/** Reject before calling the model if pre-flight input estimate exceeds the per-call cap. */
export declare function checkPerCallBudget(systemPrompt: string, userMessage: string, settings: RecapSettings): BudgetVerdict;