/**
 * PromptRenderer — Pure functions that render resolved prompt sections to a string.
 *
 * Handles XML tag wrapping, token budgeting (trimming shrinkable sections in
 * reverse priority order), and security validation.
 *
 * @module
 */
import type { ResolvedSection } from './PromptAssembly.js';
/**
 * Options controlling how resolved sections are rendered to a final string.
 */
export interface RenderOptions {
    /** Maximum token budget for the rendered prompt. If exceeded, shrinkable sections are trimmed. */
    maxTokens?: number;
    /** Whether to wrap each section in XML tags. Defaults to true. */
    useXmlTags?: boolean;
    /** Whether to validate that security sections (security_core, security_reminder) exist. Defaults to true. */
    validateSecurity?: boolean;
}
/**
 * Thrown when prompt validation fails (e.g. missing security sections).
 */
export declare class PromptValidationError extends Error {
    constructor(message: string);
}
/**
 * Renders an array of resolved sections into a single prompt string.
 *
 * Behavior:
 * 1. Filters out sections with empty content.
 * 2. Validates that security sections exist (if `validateSecurity` is true).
 * 3. If total tokens exceed `maxTokens`, trims shrinkable sections in
 *    **reverse** priority order (lowest priority trimmed first — so knowledge,
 *    memory, and tools are trimmed before role/instructions).
 * 4. Wraps each section in `<tag>\ncontent\n</tag>` when `useXmlTags` is true.
 *
 * @param sections - Pre-sorted resolved sections (ascending priority).
 * @param options  - Render options.
 * @returns The assembled prompt string.
 */
export declare function renderSections(sections: ResolvedSection[], options?: RenderOptions): string;