/**
 * InjectionFormatter — 将知识条目格式化为可注入的文本块
 * 支持 markdown 和 plain text 两种输出格式
 * 支持 summary-only 和 full-content 两种披露模式（渐进式披露）
 */
import type { KnowledgeEntry } from '../types/index.js';
export type InjectionFormat = 'markdown' | 'plain';
/**
 * Disclosure mode — controls how much content is injected.
 * - 'summary': inject only a one-line description (saves tokens)
 * - 'full': inject complete content (for deep context)
 */
export type DisclosureMode = 'summary' | 'full';
export interface FormattedBlock {
    text: string;
    entryId: string;
    estimatedTokens: number;
    /** The disclosure mode used to produce this block */
    disclosureMode: DisclosureMode;
}
export declare class InjectionFormatter {
    private readonly format;
    private readonly disclosureMode;
    constructor(format?: InjectionFormat, disclosureMode?: DisclosureMode);
    formatEntry(entry: KnowledgeEntry, modeOverride?: DisclosureMode): FormattedBlock;
    formatEntries(entries: KnowledgeEntry[], modeOverride?: DisclosureMode): FormattedBlock[];
    private formatMarkdown;
    /**
     * Summary-only markdown: one-line description for system prompt injection.
     * Full content loaded on demand via ContextInjector.injectById().
     */
    private formatMarkdownSummary;
    private formatPlain;
    /**
     * Summary-only plain text: compact single line.
     */
    private formatPlainSummary;
}
/** 简易 token 估算：~4 字符 ≈ 1 token */
export declare function estimateTokens(text: string): number;
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