import type { ProviderId } from "../types.js";
import { RESERVED_OUTPUT_TOKENS, SAFETY_MARGIN_TOKENS } from "./request-accounting.js";
export { RESERVED_OUTPUT_TOKENS, SAFETY_MARGIN_TOKENS };
export declare const DEFAULT_AUTO_COMPACT_REQUEST_TOKENS = 180000;
/** A session-specific model window reserves 30% for output and wire overhead. */
export declare const CUSTOM_CONTEXT_COMPACTION_RATIO = 0.7;
export declare const MIN_AUTO_COMPACT_REQUEST_TOKENS = 20000;
export type RequestBudgetSource = "explicit" | "legacy" | "default" | "session";
export interface RequestBudget {
    readonly configured: number;
    readonly modelSafe: number;
    readonly effectiveTrigger: number;
    readonly source: RequestBudgetSource;
    readonly clampedByModel: boolean;
}
export declare function configuredRequestTokens(): {
    tokens: number;
    source: RequestBudgetSource;
};
export declare function modelSafeRequestTokens(provider: ProviderId | undefined, model: string | undefined): number;
export declare function resolveRequestBudget(input?: {
    readonly provider?: ProviderId | undefined;
    readonly model?: string | undefined;
    readonly overrideTokens?: number | undefined;
    /** User-declared provider/model window for this session only. */
    readonly contextLimitTokens?: number | undefined;
}): RequestBudget;
export declare function requestBudgetDenominator(provider: ProviderId | undefined, model: string | undefined, contextLimitTokens?: number | undefined): number;