/**
 * Auto-upgrades AGENTS.md reference lines from old formats to canonical format.
 *
 * Searches through content line-by-line for old reference patterns and replaces them with the
 * current canonical version. Supports all three file variants (agents-base.md,
 * agents-docs-markdown.md, agents-docs-website.md).
 *
 * Operation is idempotent - safe to run on already-upgraded content.
 *
 * @param content - The AGENTS.md file content
 * @returns Updated content with upgraded reference line, or unchanged if no match found
 */
export declare function upgradeAgentsReference(content: string): string;
/**
 * Default AGENTS.md template for new projects.
 */
export declare const AGENTS_MD: string;