/**
 * Steering hint utilities.
 *
 * Manages the steering hint tag that is injected before the latest user
 * message each turn. Provides helpers for stripping, detecting, and building
 * the hint so they can be tested independently.
 */
export declare const STEERING_HINT_OPEN_TAG: string;
export declare const STEERING_HINT_CLOSE_TAG: string;
export declare const STEERING_HINT: string;
/** Input-message content types (string or multipart text-part array). */
type MessageContent = string | Array<{
    type: string;
    text?: string;
}>;
/** Strip any old steering hint tags from a string. */
export declare function stripSteeringHintText(text: string): string;
/** Strip steering hint tags from content (string or text-part array). */
export declare function stripSteeringHintFromContent(content: string | {
    type: string;
    text?: string;
}[]): string | {
    type: string;
    text?: string;
}[];
/** Check whether content (string or text-part array) contains the steering hint tag. */
export declare function contentContainsSteeringHintTag(content: MessageContent): boolean;
/** Deep-equality check that handles unordered object keys (unlike JSON.stringify). */
export declare function isJsonEqual(a: unknown, b: unknown): boolean;
/** Remove any existing steering-hint system messages and strip tags from user messages.
 *  Returns the sanitized messages and a flag indicating whether anything changed.
 */
export declare function stripSteeringHintsFromMessages(messages: any[]): {
    messages: any[];
    changed: boolean;
};
export declare function configureSteering(config: {
    enabled: boolean;
    customPrompt?: string;
}): void;
/** Build a system message containing the steering hint.
 *  Returns null when steering is disabled so the caller can skip injection.
 */
export declare function makeSteeringHintMessage(referenceMessage?: any): any | null;
export {};
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