Every puppet browser verb takes browser: chrome (default, CDP daemon) or safari. Safari runs through AppleScript do JavaScript against the logged-in session, with native CGEvent clicks/keys in frame's screen space under the shared input lease. Semantic snapshot/click/fill/wait keep the strict locator contract; choose and upload stay Chrome-only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>