The ability to inventory cryptography and replace an algorithm without redesigning the system.
Agility is not a property of the algorithms you chose. It is a property of how your code, your data formats and your protocols name them—and whether anything can change without a coordinated rewrite.
Every post-quantum migration plan begins with an inventory, and most inventories stall because the team looks for algorithms instead of looking for the places algorithms are decided.
A plan that lists algorithms and a target year is a statement of intent. A plan that survives review names sequenced workstreams, dependency owners, interim states and the decisions that are already overdue.
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Read the method, assumptions and questions to ask.