Function getFileIdentity

src/skills/loadSkillsDir.ts:118–124

* Gets a unique identifier for a file by resolving symlinks to a canonical path. * This allows detection of duplicate files accessed through different paths * (e.g., via symlinks or overlapping parent directories). * Returns null if the file doesn't exist or can't be resolved. * * Uses realpath

(filePath: string)

 * See: https://github.com/anthropics/claude-code/issues/13893
 */
async function getFileIdentity(filePath: string): Promise<string | null> {
  try {
    return await realpath(filePath)
  } catch {
    return null
  }
}

// Internal type to track skill with its file path for deduplication
type SkillWithPath = {