import type { AgentModelRequirements } from '../../book-2.0/agent-source/AgentModelRequirements';
import { BaseCommitmentDefinition } from '../_base/BaseCommitmentDefinition';
/**
 * META VOICE commitment definition
 *
 * The META VOICE commitment tells the agent which ElevenLabs voice ID should be used
 * when text-to-speech playback is requested.
 *
 * Example usage in agent source:
 *
 * ```book
 * META VOICE 21m00Tcm4TlvDq8ikWAM
 * ```
 *
 * @private Voice-related metadata used only by the UI and TTS helpers
 */
export declare class MetaVoiceCommitmentDefinition extends BaseCommitmentDefinition<'META VOICE'> {
    constructor();
    /**
     * Short one-line description of META VOICE.
     */
    get description(): string;
    /**
     * Icon for this commitment.
     */
    get icon(): string;
    /**
     * Markdown documentation for META VOICE commitment.
     */
    get documentation(): string;
    applyToAgentModelRequirements(requirements: AgentModelRequirements, content: string): AgentModelRequirements;
    /**
     * Convenience helper to normalize the provided voice ID.
     */
    extractVoiceId(content: string): string | null;
}