- **Use case**: a *“research assistant team”*:
	- **Researcher** agent → searches the web / literature and gathers info
	- **Writer** agent → turns notes into a clean answer
	- **Critic** agent → reviews the draft and tightens it up
	- **Supervisor** agent → decides which specialist to call and when
- Setup
	- ```
	  python -m venv venv
	  .\venv\Scripts\Activate.ps1
	  pip install -U "langchain>=1.0" langchain-openai langchain-community
	  export OPENAI_API_KEY="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"
	  ```