/** Whether Codex can load a skill below `path`, a `node_modules` directory
 * `depth` levels below its plugin cache. A marketplace, plugin or version
 * directory is an identity, so one named `node_modules` is always walked.
 * Inside a version, the directory is walked when it lies in, or leads to, a
 * manifest-declared skills path or the default `skills` root. Codex replaces
 * the default with a declared path; Skills keeps walking it, as it walks every
 * other visible directory in the cache. A manifest that cannot be read exactly
 * (a link or special file, oversized, invalid UTF-8 or JSON, duplicate keys, an
 * unsupported skills shape or an escaping path) walks it too, so an unreadable
 * declaration never hides a loaded skill. */
export declare function codexPluginCacheSkillTree(path: string, depth: number): boolean;