Saves the open browser session as a clean, replayable workflow and closes the browser. Everything composed with writ_browser_compose is materialized: named api functions become api_call steps with the auth function first, declared inputs become the workflow's parameters, explicit steps land at their position. The saved workflow is active immediately: it runs on demand through writ_run_workflow (function_name calls one function) or its own run_ tool (writ_pin_workflow_tool) at zero AI cost, can be scheduled with writ_set_schedule, exposed as a REST endpoint with writ_expose_workflow_api, and documented at GET /api/v1/workflows/{id}/api-docs. A session bound to a build (writ_website_to_api guided) settles that build. The save is refused, with the reasons, when a step or function references something no run could resolve; the browser then stays open. A workflow is only as sound as the task's run on the live page.