Rename Files to Random UUIDs via macOS Shortcuts

A companion to the Bash UUID rename snippet, this AppleScript is meant to be dropped into a "Run AppleScript" action inside the macOS Shortcuts app (or Automator as a Quick Action). It accepts the files passed in as input, generates a random lowercase UUID for each one, and renames the file in place while preserving the original extension — handy as a right-click service in Finder.

on run {input, parameters}
  repeat with f in input
    set posixPath to POSIX path of f
    set ext to do shell script "basename " & quoted form of posixPath & " | sed 's/.*\\.//'"
    set uuid to do shell script "uuidgen | tr '[:upper:]' '[:lower:]'"
    set newName to uuid & "." & ext
    tell application "Finder"
      set name of (POSIX file posixPath as alias) to newName
    end tell
  end repeat
  return input
end run