Part 54 · Module 10: Environments and ExecutionModule 10: Environments and Execution1 min read·13 Oct 2026What you need firstModule 1: the returns_desk/ package and tests with pytest.Module 3: the eight tools, make_failure_safe_tools and call in returns_desk/tools.py, and which tools cannot be undone.Module 5, Lesson 1: the agent loop.Python's subprocess module at a reading level, and what an environment variable is.