Part 77 · Module 14: Observability and DebuggingModule 14: Observability and Debugging1 min read·13 Oct 2026What you need firstModule 1: the returns_desk/ package and tests with pytest.Module 3: the eight tools in returns_desk/tools.py, TOOL_DEFS and call.Module 5: the agent loop, its limits and ScriptedModel.Module 13: the careful plans and the eval gate.