/**
 * AI SDK Tools Registry - Middleware Pipeline
 *
 * Composable middleware for tool execution:
 * - Logging
 * - Tracing
 * - Rate limiting
 * - Redaction
 * - Timeout handling
 */
import type { ToolMiddleware, ToolLogger } from './types';
/**
 * Create a logging middleware
 */
export declare function createLoggingMiddleware(logger?: ToolLogger): ToolMiddleware;
/**
 * Create a timeout middleware
 */
export declare function createTimeoutMiddleware(defaultTimeoutMs?: number): ToolMiddleware;
/**
 * Create a redaction middleware for PII/sensitive data
 */
export declare function createRedactionMiddleware(patterns?: RegExp[]): ToolMiddleware;
/**
 * Create a rate limiting middleware (simple token bucket)
 */
export declare function createRateLimitMiddleware(maxRequests?: number, windowMs?: number): ToolMiddleware;
/**
 * Create a retry middleware with exponential backoff
 */
export declare function createRetryMiddleware(maxRetries?: number, baseDelayMs?: number): ToolMiddleware;
/**
 * Create a tracing middleware that adds trace context
 */
export declare function createTracingMiddleware(): ToolMiddleware;
/**
 * Create a validation middleware that checks input against limits
 */
export declare function createValidationMiddleware(): ToolMiddleware;
/**
 * Compose multiple middleware into a single middleware
 */
export declare function composeMiddleware(...middlewares: ToolMiddleware[]): ToolMiddleware;