/**
 * In-Memory Rate Limiter for MCP Server
 *
 * Provides per-tool rate limiting using a sliding window counter.
 * Designed for single-process MCP server usage.
 */
export interface RateLimitConfig {
    /** Maximum number of requests allowed in the window */
    maxRequests: number;
    /** Window duration in milliseconds */
    windowMs: number;
}
/**
 * Default rate limits per tool category
 */
export declare const DEFAULT_RATE_LIMITS: Record<string, RateLimitConfig>;
/**
 * Explicit tool → category mapping.
 * Ensures every registered tool resolves to its intended rate limit category
 * instead of relying on fragile string-parsing heuristics.
 */
export declare const TOOL_CATEGORIES: Record<string, string>;
export declare class RateLimiter {
    private windows;
    private configs;
    constructor(configs?: Record<string, RateLimitConfig>);
    /**
     * Check if a request is allowed under the rate limit.
     * Returns true if allowed, false if rate limited.
     */
    isAllowed(toolName: string): boolean;
    /**
     * Get remaining requests in current window.
     */
    getRemaining(toolName: string): number;
    /**
     * Get time until next available request slot (in ms).
     * Returns 0 if requests are available now.
     */
    getRetryAfter(toolName: string): number;
    /**
     * Reset rate limits for a specific tool or all tools.
     */
    reset(toolName?: string): void;
    private getConfig;
    private getToolCategory;
}
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