/**
 * Custom Assertion API — Let users define and register custom assertions.
 */
import type { AgentTrace, AssertionResult } from './types';
export type CustomAssertionFn = (trace: AgentTrace, params?: Record<string, any>) => {
    pass: boolean;
    message: string;
};
/**
 * Register a custom assertion by name.
 */
export declare function registerAssertion(name: string, fn: CustomAssertionFn): void;
/**
 * Unregister a custom assertion.
 */
export declare function unregisterAssertion(name: string): boolean;
/**
 * Check if a custom assertion is registered.
 */
export declare function hasAssertion(name: string): boolean;
/**
 * List all registered custom assertion names.
 */
export declare function listAssertions(): string[];
/**
 * Evaluate a custom assertion against a trace.
 */
export declare function evaluateCustomAssertion(name: string, trace: AgentTrace, params?: Record<string, any>): AssertionResult;
/**
 * Clear all registered custom assertions.
 */
export declare function clearAssertions(): void;
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