import type { Middleware } from '../middleware/types.js';
import type { HookContext, HookResult } from '../hooks/types.js';
/**
 * 工具调用守卫：对指定工具进行拦截
 * - 可配置需要拦截的工具名列表
 * - 匹配时 onToolBefore 返回 block，阻止工具执行
 */
export declare class ToolGuardMiddleware implements Middleware {
    name: string;
    private blockedTools;
    private logger;
    constructor(blockedTools: string[], logger?: (msg: string) => void);
    onToolBefore(ctx: HookContext): Promise<HookResult | void>;
}
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