import type { AgentModelRequirements } from '../../book-2.0/agent-source/AgentModelRequirements';
import { BaseCommitmentDefinition } from '../_base/BaseCommitmentDefinition';
/**
 * META INPUT PLACEHOLDER commitment definition.
 *
 * The `META INPUT PLACEHOLDER` commitment sets the chat input placeholder text
 * that user interfaces should render for this agent.
 *
 * @private Metadata-only commitment used by chat UIs.
 */
export declare class MetaInputPlaceholderCommitmentDefinition extends BaseCommitmentDefinition<'META INPUT PLACEHOLDER'> {
    constructor();
    /**
     * Short one-line description of META INPUT PLACEHOLDER.
     */
    get description(): string;
    /**
     * Icon for this commitment.
     */
    get icon(): string;
    /**
     * Markdown documentation for META INPUT PLACEHOLDER commitment.
     */
    get documentation(): string;
    applyToAgentModelRequirements(requirements: AgentModelRequirements, content: string): AgentModelRequirements;
    /**
     * Convenience helper to normalize configured placeholder text.
     */
    extractInputPlaceholder(content: string): string | null;
}