/**
 * Error thrown when a guardrail blocks a request
 */
export declare class GuardrailBlockError extends Error {
    readonly pluginName: string;
    readonly reason: string;
    constructor(pluginName: string, reason: string);
}
/**
 * Error thrown when a guardrail plugin fails to initialize
 */
export declare class GuardrailInitError extends Error {
    readonly pluginName: string;
    readonly cause: Error | undefined;
    constructor(pluginName: string, message: string, cause?: Error);
}
/**
 * Error thrown when a guardrail plugin execution fails
 */
export declare class GuardrailExecutionError extends Error {
    readonly pluginName: string;
    readonly phase: string;
    readonly cause: Error | undefined;
    constructor(pluginName: string, phase: string, message: string, cause?: Error);
}
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