coasty-ai/open-cowork ? reverse-engineered prompt

Build me an open source AI coworker app that can take over computer tasks and show me what it is doing step by step. I want a simple chat style interface where I can delegate things like browsing the web, filling forms, renaming files, or other desktop tasks, then watch the live screen activity, pause it, approve any risky step, and stop it if needed.

It should work on desktop and in the browser, and it should support my own model key or a local model instead of forcing one provider. Make it easy to run with almost no setup, and have a demo mode so I can try it right away without billing. I also want a clear cost estimate before a task starts, a running timeline of actions, and the ability to resume or take over manually if the task needs my help. If you need to check current docs for browser or model integrations, look them up online.