haseeb-heaven/open-agent ? reverse-engineered prompt

Build me a terminal based AI assistant called OpenAgent that feels easy to use from the command line.

I want to type a plain English task like analyze a CSV, write code, or search the web, and have the agent plan the work, use the right tools, and show me the result right in the terminal. It should work with free or local models by default, but also let me plug in cloud model keys if I want. No account should be required just to get started.

Please include a simple setup flow, a way to list available models, choose a provider, and connect API keys when needed. It should also support web search, extension installs, and a safe approval flow for tool use, with an option for trusted automatic mode. Make it work on Windows, Mac, and Linux, and keep the experience clean and friendly. If you need current model or provider docs, look them up online first.