Since pytorch is a special example (the agent will pick the correct pytorch based on the installed CUDA) , the agent will first make sure the file is downloaded, and then pass the resolving for pip to decide if it necessary to install. (bottom line, we downloaded the torch for no reason but it is cached so no real harm done) It might be the second package needs a specific numpy version... this resolving is don't by pip, not the agent specifically. Anyhow --system-site-packages is applicable on a venv level, so no need to worry about that.Make sense ?