langchain-ai/open_deep_research ? reverse-engineered prompt

Build me an open source deep research app that can take a question, search the web, read a lot of sources, and then write a clear, well organized research report with citations.

I want it to be easy to run locally, with a simple browser based interface where I can paste a topic, choose settings, and start the research. It should let me swap between different AI models and search providers, and it should also work with MCP servers if I want to connect extra tools.

The main thing is that it should do multi step research on its own, summarize what it finds, compress the useful facts, and then produce a final answer that feels like a real research memo. Please make it configurable through environment settings so I can change providers without rewriting code. If you need to check current docs for any model or search tool setup, go ahead and look them up online.