/**
 * A cheap structural outline of a file: top-level symbols and where they start.
 *
 * Used by the read dedup short-circuit. Telling the model "UNCHANGED, reuse your copy" assumes
 * the model still *has* that copy — but its context gets compacted as a conversation grows, so
 * the file it read 200 turns ago may be gone while the server still remembers sending it. A
 * bare hash gives it nothing to act on. An outline costs ~50 tokens and lets it decide whether
 * it needs to re-fetch, and where to look if it does.
 */
export interface OutlineEntry {
    line: number;
    text: string;
}
/**
 * Extract up to `limit` structural landmarks. Deliberately regex-based rather than a real
 * parse: this runs on a path whose entire purpose is to avoid spending tokens, so it must not
 * spend meaningful time either.
 */
export declare function fileOutline(content: string, limit?: number): OutlineEntry[];
/** One-line-per-symbol rendering for the UNCHANGED marker. */
export declare function formatOutline(entries: OutlineEntry[], totalLines: number): string;
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