Contents - Editing and Verification Enforcement - Key Concepts - Cell Structure - Editing Rules - Core CLI Commands - Export Commands - Data and Visualization - Debugging Workflow - Common Issues - Additional Resources Marimo Reactive Notebooks Marimo is a reactive Python notebook where cells form a DAG and auto-execute on dependency changes. Notebooks are stored as pure files. Editing and Verification Enforcement IRON LAW #1: NEVER MODIFY CELL DECORATORS OR SIGNATURES Only edit code INSIDE function bodies. This is not negotiable. NEVER modify: - Cell decorators ( ) - Function signatures ( )…