export interface SkillBuilderDetection {
    installed: boolean;
    path: string | null;
    version: string | null;
}
/**
 * Check if the skill-builder skill is installed in any known location.
 *
 * Detection order (first match wins):
 * 1. In-source workspace path: {projectRoot}/plugins/skills/skills/skill-builder/SKILL.md
 *    (where vskill ships skill-builder when developing in this monorepo)
 * 2. Global canonical: ~/.agents/skills/skill-builder
 * 3. Project-local canonical: {projectRoot}/.agents/skills/skill-builder
 * 4. Project-local agent-native: {projectRoot}/{agent.localSkillsDir}/skill-builder
 *    for every agent in AGENTS_REGISTRY (covers .claude/skills, .cursor/skills, etc.)
 * 5. Any registered agent's global skills directory
 * 6. Any agent's plugin cache (e.g. ~/.claude/plugins/cache/)
 *
 * 0786 (AC-US2-03/05): marketplace catalog at
 * `~/.claude/plugins/marketplaces/<mkt>/plugins/<name>` is NOT treated as
 * installed — it is the *available* plugin index. Only the plugin cache is
 * evidence of installation. Pre-0786 the marketplace branch caused
 * Studio's Engine Selector to label uninstalled engines as installed.
 */
export declare function isSkillBuilderInstalled(projectRoot?: string): SkillBuilderDetection;
/**
 * 0786 AC-US2-03: thin wrapper exposing only the matched path. Mirrors
 * findSkillCreatorPath in shape so route handlers and the Engine Selector
 * can answer "where is skill-builder installed?" without inspecting the
 * full SkillBuilderDetection record.
 */
export declare function findSkillBuilderPath(projectRoot?: string): string | null;