/**
 * Context Budget Checker
 *
 * Pre-generation validation that estimates total input token cost
 * and compares against the model's available input space.
 *
 * This runs BEFORE every LLM call to prevent context overflow.
 */
import type { BudgetCheckResult, BudgetCheckParams } from "../types/index.js";
/**
 * Check whether a request fits within the model's context budget.
 *
 * Estimates total input tokens from: system prompt + tool definitions +
 * conversation history + current prompt + file attachments, and compares
 * against available input space.
 */
export declare function checkContextBudget(params: BudgetCheckParams): BudgetCheckResult;