The February 2026 repricing forced a question every software operator and investor now has to answer: for any given software company today, what makes it defensible?

The instinct is to look for surviving moats. That instinct is wrong. There is no defensible SaaS in the old sense — only software that has migrated, or can migrate, into something else: an agent-shaped, outcome-priced, machine-callable execution layer.

Defensibility is no longer a position to defend. It is a migration to complete, measured against a capability frontier that is itself moving.

The Defensibility Map is the diagnostic for that migration. It is neither a SaaS framework nor an AGaaS framework. It is the framework for the vector between them — origin state, transitional state, destination state — and the system of layered diagnostics that determines whether a given company’s architectural position actually translates into commercial survival.