/** Returns true if AGENTS.md exists in the given project directory. */
export declare function hasAgentsMd(projectPath: string): boolean;
/**
 * Updates the planu-sdd section in an existing AGENTS.md file without overwriting user content.
 * If the file does not exist, it creates it with the new content.
 * If the file exists but has no planu-sdd markers, the section is appended.
 * If the file has existing markers, only the marked section is replaced.
 */
export declare function updateAgentsMdSection(filePath: string, newContent: string): void;
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