QwenLM/Qwen-Agent ? reverse-engineered prompt

Build me a Python framework for creating Qwen powered AI agents. I want it to feel like a practical starter kit, not just a demo.

It should let someone connect to Qwen through DashScope or an OpenAI compatible local service, create an assistant, give it tools, let it call functions, remember context, read files, search or retrieve from documents, and run code when enabled. Include example apps like a browser assistant, a code interpreter style assistant, and a custom assistant with a simple web UI.

Please make the project easy to install and run from source, with clear examples for common use cases like adding a custom tool, using MCP tools, doing RAG over local files, and launching a server. Add sensible tests and keep the code organized so developers can extend agents, tools, model backends, and prompts without digging through everything.

Use the current Qwen Agent docs online if you need to check details.